C Glossary Terms

C cells are special cells in the thyroid gland that produce calcitonin, a hormone that helps control calcium levels in the blood. These cells are important because some thyroid cancers, like medullary thyroid cancer, develop from C cells. Understanding C cells can help patients better follow discussions about thyroid health and cancer care.

C-ABL is an enzyme made by a gene on chromosome 9 that helps control how cells grow and divide. In many people with chronic myelogenous leukemia (CML), part of chromosome 9 containing the c-ABL gene swaps places with part of chromosome 22. This creates a new gene called BCR::ABL1, which leads to uncontrolled cell growth and plays a key role in CML.

C-Erbb-2, also called HER2, is a protein on some cells that helps them grow normally. Some cancers, like breast and ovarian cancer, may have too much HER2, which can make cancer cells grow faster and spread. Testing for HER2 helps doctors choose treatments that target these cancer cells. It may also appear under related names such as HER2, HER2/Neu, Human EGF Receptor 2, And Human Epidermal Growth Factor Receptor 2.

C-Erbb-2 positive, also called HER2 positive, means cancer cells have extra amounts of a protein called HER2 on their surface. This protein helps control cell growth, but when there’s too much, cancer cells may grow faster and spread more easily. Knowing if a cancer is c-erbB-2 positive helps doctors choose treatments that target these cells.

C-Fos antisense oligonucleotide is an experimental substance studied for treating cancer, rheumatoid arthritis, and some skin conditions. It works by blocking a protein called c-fos that helps control cell growth. By stopping c-fos, it may help slow or kill cancer cells that rely on this protein. This treatment is not yet standard and is still being researched.

C-Kit, also called CD117 or stem cell factor receptor, is a protein on the surface of many cells that helps certain blood cells grow by binding to stem cell factor. It may be found in higher amounts or altered forms in some cancers like gastrointestinal stromal tumors and melanoma. Testing for C-Kit helps doctors diagnose these cancers and plan treatment.

C-peptide, also called connecting peptide, is a substance made by the pancreas when it produces insulin. Measuring C-peptide levels in the blood helps doctors understand how much insulin the body is making. Abnormal levels can be seen in conditions like diabetes or some cancers, but C-peptide alone does not diagnose these diseases.

The C-Peptide Suppression Test is a blood test used to help find rare pancreatic tumors called insulinomas. After fasting, a patient receives an insulin injection, and blood is checked for C-peptide, a substance made alongside insulin. Higher than normal C-peptide levels during this test may suggest an insulinoma, helping doctors understand the cause of low blood sugar symptoms.

C-reactive protein (CRP) is a protein made by the liver when there is inflammation or tissue damage in the body. Healthy people usually have very low or undetectable CRP levels. Higher CRP levels can indicate infections, cancer, autoimmune diseases, or heart problems. Measuring CRP helps doctors understand inflammation and monitor certain health conditions.

A C-section, also called a cesarean delivery, is a surgical way to deliver a baby through cuts made in the abdomen and uterus. It is used when vaginal birth isn’t safe or possible. After the baby is born, the umbilical cord is cut, the placenta is removed, and the incisions are closed with stitches.

CA 15-3 is a protein found on certain cells, especially those lining organs. It is part of a larger protein called MUC 1. Doctors measure CA 15-3 levels in the blood to help monitor some cancers, like breast cancer, and to see how well treatment is working or if cancer has returned. It is one of several tools used alongside other tests.

CA 19-9 is a substance found in the blood that comes from both normal and cancer cells. Higher levels of CA 19-9 may suggest pancreatic cancer or other health conditions. Doctors often measure CA 19-9 to help monitor how well cancer treatments are working or to check if cancer has returned.

The CA 19-9 assay is a blood test that measures the level of CA 19-9, a substance released by some cancer and normal cells. Higher levels may suggest pancreatic cancer or other conditions. Doctors use this test mainly to help monitor cancer treatment or check if cancer has returned, but it is not used alone to diagnose cancer.

CA 27.29 is a protein found on cells that line the body’s surfaces. It is part of a larger protein called MUC 1. Higher levels of CA 27.29 may be found in the blood of some people with certain cancers, especially breast cancer. Measuring CA 27.29 can help doctors monitor how well cancer treatment is working or check if cancer has returned.

CA-125, also called cancer antigen 125, is a protein found in the blood that can be higher in some people with ovarian cancer and certain other cancers. Doctors use CA-125 blood tests mainly to help monitor how well treatment is working or to check if cancer has returned after treatment. It is not a perfect test and is used together with other exams and tests.

A Community Advisory Board (CAB) is a group of volunteers from the community who work with cancer researchers to help design and explain clinical trials. They review study plans to ensure they respect community values and help patients and families understand research, making clinical trials more accessible and trustworthy. It may also appear under related names such as Community Advisory Board.

Cabazitaxel (brand name Jevtana) is a chemotherapy drug used with prednisone to treat prostate cancer that has spread and no longer responds to hormone-lowering treatments. It is given to patients who have already received chemotherapy with docetaxel. Cabazitaxel works by stopping cancer cells from growing and dividing and is being studied for other cancers.

CABG, or coronary artery bypass grafting, is a surgery that uses a healthy blood vessel from another part of the body to create a new path around a blocked artery to the heart. This helps restore blood flow and brings oxygen and nutrients to the heart muscle. It is also called aortocoronary bypass.

Cablivi (caplacizumab) is a medicine used with plasma exchange and immunosuppressive therapy to treat acquired thrombotic thrombocytopenic purpura (aTTP), a rare blood disorder where tiny clots form in small blood vessels. It works by binding to von Willebrand factor (VWF), a protein involved in clotting, to help prevent harmful clots from forming. Cablivi is a type of nanobody, a very small antibody.

Cabometyx is a targeted cancer drug containing cabozantinib-s-malate. It is used alone or with other medicines to treat certain liver, kidney, and thyroid cancers. Cabometyx works by blocking proteins that help cancer cells grow and by stopping the formation of new blood vessels tumors need to survive. It is also being studied for other cancers.

Cabozantinib-S-Malate is a targeted cancer drug used under brand names like Cabometyx and Cometriq. It treats certain thyroid cancers, liver cancer, kidney cancer, and neuroendocrine tumors by blocking proteins that help cancer cells grow and by stopping new blood vessel formation that tumors need to survive. This entry helps connect the word with diagnoses, testing, treatments, supportive care, research notes, protocols, media, books, people, organizations, and safety concerns.

Cacao is the raw form of the beans used to make chocolate. It contains natural compounds like antioxidants and flavonoids that may help protect cells and support health. While not a cancer treatment, cacao is being studied for its possible role in supporting wellness during cancer care. This entry helps connect the word with diagnoses, testing, treatments, supportive care, research notes, protocols, media, books, people, organizations, and safety concerns.

Cachexia, also known as wasting syndrome, is a condition where a person loses more than 10% of their body weight without trying. This includes loss of muscle and fat. It often occurs in advanced cancer and other serious illnesses. People with cachexia may feel weak, tired, and have symptoms like diarrhea or fever lasting over a month. Cachexia is hard to reverse with nutrition alone and usually requires medical care.

Coronary artery disease (CAD) is a condition where the arteries that supply blood and oxygen to the heart become narrowed or blocked, usually due to plaque buildup. This can cause chest pain, shortness of breath during activity, and increase the risk of heart attacks. Risk factors include family history, smoking, high blood pressure, and diabetes.

A CAD system, or computer-aided detection system, is a computer program that helps doctors spot unusual areas on x-ray images. It highlights parts of the image that might need a closer look. CAD systems are often used with mammograms or chest x-rays to assist in finding signs of diseases like cancer.

Cadmium is a natural metal found in small amounts in air, water, soil, and food. It is used in making batteries, pigments, plastics, and metal coatings. Tobacco smoke also contains cadmium. Breathing in or swallowing high levels of cadmium can increase the risk of certain cancers and other health problems.

CAF is a chemotherapy treatment combining three drugs—cyclophosphamide, doxorubicin (Adriamycin), and fluorouracil—mainly used to treat breast cancer. This combination attacks cancer cells in different ways and may be given alone or with other treatments. It is approved by the FDA and is also being studied for other cancers. It may also appear under related names such as CAF Regimen.

CAF Regimen is a chemotherapy treatment that combines three drugs—cyclophosphamide, doxorubicin (Adriamycin), and fluorouracil—to fight breast cancer. These medicines work together by attacking cancer cells in different ways. CAF may be used alone or with other treatments and is also being studied for other cancers. Doctors carefully monitor patients during treatment because each drug can cause side effects.

Caffeine is a natural stimulant found in coffee, tea, cocoa, and some plants. It can also be made in a lab and added to drinks, foods, and medicines. Caffeine helps increase alertness and energy but may raise heart rate and blood pressure. It’s commonly found in coffee, tea, soda, and energy drinks.

Calaspargase pegol is a medicine used with other drugs to treat acute lymphoblastic leukemia (ALL) in children and young adults from 1 month to 21 years old. It contains an enzyme that breaks down asparagine, a nutrient cancer cells need to grow. This drug stays in the body longer than similar medicines, allowing less frequent dosing. It is also being studied for other cancers.

Calbindin is a group of proteins that help move calcium into cells. These proteins are found in many tissues throughout the body and play a role in keeping cells healthy. In cancer care, calbindin may be mentioned because calcium balance affects how cells grow and respond to treatment. If you see this term, ask your care team what it means for your situation.

Calcification means calcium deposits that form in body tissues. In the breast, these deposits show up as white spots on mammograms but cannot be felt by touch. There are two types: macrocalcifications, which are larger and usually harmless, and microcalcifications, which are tiny specks that may sometimes suggest cancer when they appear in clusters.

Calcinosis is when calcium builds up in soft tissues like muscles or skin, forming hard lumps or patches. It is not cancer but can sometimes appear during cancer care due to treatment effects or tissue changes. Knowing about calcinosis helps patients understand their medical reports and discuss symptoms or concerns with their healthcare team.

Calcitonin is a hormone made by special cells in the thyroid gland that helps lower high calcium levels in the blood. It plays a role in keeping bones, muscles, and nerves healthy. In some thyroid cancers, especially medullary thyroid cancer, calcitonin levels can be higher than normal. Doctors may measure calcitonin to help diagnose or monitor these cancers and related conditions.

Calcitriol is the active form of vitamin D that your body uses to help control calcium levels. It is made naturally by the kidneys or produced as a medicine. Calcitriol helps keep bones strong and supports muscle and nerve function. Doctors may prescribe it when kidney or thyroid problems cause low calcium levels, which can happen during some cancer treatments.

Calcium is a mineral essential for strong bones, teeth, muscles, nerves, and blood vessels. It is the most common mineral in the body and plays many important roles. In cancer care, calcium levels may be checked because changes can signal health issues or affect treatment. Calcium is found in foods, supplements, and sometimes in body tissues where it may indicate disease.

Calcium antagonists, also called calcium channel blockers, are medicines that help relax and widen blood vessels by blocking calcium from entering heart and blood vessel muscle cells. This makes it easier for blood to flow and lowers blood pressure. Some also slow the heartbeat. They are used to treat high blood pressure, chest pain, and irregular heartbeats.

Calcium Ca 41-chloride aqueous solution is a radioactive form of calcium used in medical tests to help find and monitor cancer that has spread to the bones. It also helps doctors study bone health and diagnose bone conditions like osteoporosis. After the test, the substance leaves the body through urine.

Calcium Ca 46-chloride aqueous solution is a special form of calcium tagged with a small amount of radiation. It helps doctors study how bone tissue changes in conditions like osteoporosis or cancer that has spread to the bones. After the test, the radioactive calcium leaves the body through urine. This test provides information about bone health and disease activity.

Calcium carbonate is a mineral supplement often used to help keep bones strong and to treat or prevent osteoporosis, a condition where bones become weak. It also helps relieve heartburn and upset stomach by neutralizing stomach acid. In cancer care, calcium carbonate is being studied for its role in protecting bones from damage caused by cancer or its treatments. It is available over the counter as a dietary supplement.

Calcium channel blockers, also called calcium antagonists, are medicines that help relax and widen blood vessels by blocking calcium from entering the muscle cells of the heart and blood vessels. This helps lower blood pressure, improve blood flow, and sometimes slow the heartbeat. They are used to treat high blood pressure, chest pain, and irregular heartbeats.

Calcium gluconate is a mineral supplement made by combining calcium with glucose, a type of sugar. It is used to help prevent and treat osteoporosis, a condition where bones become weak and fragile. In cancer care, it is being studied for its potential to protect bones and nerves from damage caused by chemotherapy. Always talk with your healthcare team before using calcium gluconate to ensure it fits your treatment plan.

The calcium infusion test is a special procedure used to help find a rare pancreatic tumor called a gastrinoma. During the test, calcium gluconate is slowly given through an IV over about three hours. Blood samples are taken before and after to measure gastrin, a hormone. If gastrin levels rise significantly, it may suggest the presence of a gastrinoma, helping doctors decide on further care.

Calendula ointment is a skin cream made from the marigold flower, traditionally used to soothe minor cuts, burns, and irritation. Some research is exploring its use to prevent skin problems during radiation therapy for cancer, but the specific ointment studied is not widely available in the U.S. Products labeled as calendula ointment may vary in ingredients and effects. Always talk with your care team before using it during cancer treatment.

Calgranulin A, also called S100 Calcium Binding Protein A8, is a protein made by many types of cells. It plays roles inside and outside cells and is found in higher amounts during inflammation and in some cancers. Researchers are studying it as a possible marker to help detect or monitor breast cancer, but it is not yet a routine test.

Calgranulin B, also known as S100 Calcium Binding Protein A9, is a protein made by many types of cells. It plays a role in inflammation and is found in higher amounts in conditions like rheumatoid arthritis and some cancers. Researchers are studying it as a possible marker to help detect or monitor breast cancer, but it is not yet used routinely in cancer care.

Caloric intake is the total number of calories, or energy units, you get from the foods and drinks you consume. In cancer care, understanding and managing caloric intake helps support your nutrition and energy needs during treatment and recovery. The right amount varies for each person based on their diagnosis, treatment, and overall health.

A calorie is a unit that measures the energy in food and drinks. Your body uses calories to perform everyday functions like breathing, moving, and healing. During cancer or its treatment, your body may need more calories to help fight illness and recover. Understanding calories helps support your nutrition and strength during care.

A Calorie Restriction Diet means intentionally eating fewer calories than usual. In cancer care, it is sometimes discussed for its possible effects on metabolism, inflammation, and treatment support. It is not a standard cancer treatment and should only be considered with medical guidance to ensure safety and proper nutrition during cancer therapy.

A Calorie-Restricted Ketogenic Diet is a special eating plan that limits both calories and carbohydrates. It encourages the body to use fat for energy instead of sugar, producing ketones. Sometimes discussed in cancer care, it may affect metabolism, inflammation, and treatment tolerance. It is not a standard cancer treatment and should only be considered with medical advice and careful monitoring.

Calquence (also called acalabrutinib) is a targeted medicine used to treat certain blood cancers in adults, including chronic lymphocytic leukemia, small lymphocytic lymphoma, and mantle cell lymphoma. It works by blocking a protein that helps cancer cells grow. Calquence can be given alone or with other drugs, depending on the type and stage of cancer and previous treatments.

The CALR gene makes a protein that helps control calcium inside cells, which is important for cell growth, movement, and death. Changes in this gene have been found in some blood disorders, affecting how blood cells grow and work. Knowing about the CALR gene can help patients understand blood test results and discussions about certain blood conditions.

CAM stands for complementary and alternative medicine. It includes medical products and practices used alongside or instead of standard cancer treatments. Examples include acupuncture, herbal supplements, meditation, and massage. While some CAM therapies may help with side effects or stress, less is known about their safety and effectiveness compared to standard care. Always talk with your healthcare team before trying CAM.

Camcevi (leuprolide mesylate) is a hormone therapy medicine used to treat advanced prostate cancer in adult men. It works by first increasing, then lowering hormones that control testosterone production. This leads to lower testosterone levels, which may help slow the growth of prostate cancer cells that need testosterone to grow.

Campath, also called alemtuzumab, is a medicine used to treat a blood cancer called B-cell chronic lymphocytic leukemia (CLL). It works by targeting a protein called CD52 on certain immune and cancer cells, helping the immune system find and destroy these cancer cells. Campath is a type of monoclonal antibody and is being studied for other cancers as well.

Camphor is a natural or lab-made substance with a strong smell, used in products like mothballs and some skin creams. Medically, it is applied to the skin to help reduce itching and fight minor infections. While not a cancer treatment, camphor-containing products may be used to soothe skin irritation during cancer care.

Camptosar, also known as irinotecan hydrochloride or CPT-11, is a chemotherapy drug used mainly to treat colorectal cancer that has spread to other parts of the body. It can be given alone or with other medicines, especially when cancer has returned or did not improve after treatment with drugs like fluorouracil.

Camptothecin is a cancer-fighting drug that works by blocking enzymes called topoisomerases, which cancer cells need to copy their DNA and multiply. It belongs to a family of medicines called topoisomerase inhibitors. Camptothecin and related drugs may be used in chemotherapy depending on the type of cancer and treatment plan.

Camptothecin analogs are chemotherapy drugs related to camptothecin, a natural substance that helps stop cancer cells from growing. They work by blocking an enzyme called topoisomerase, which cancer cells need to divide and multiply. These drugs may be part of treatment plans for certain cancers and are sometimes mentioned during discussions about chemotherapy or clinical trials.

Cancell, also known as Cantron or Protocel, is a liquid mixture once promoted as a cancer treatment. It contains chemicals that have not been proven to treat or prevent cancer. Since 1989, it has been illegal in the U.S. to make, sell, or distribute Cancell as a treatment for any disease. No reliable scientific studies support its use, so patients should discuss any use with their healthcare providers.

Cancell, also known as Cantron or Protocel, is a liquid mixture promoted by some as a cancer treatment. It is not approved by the FDA, and no reliable scientific studies have shown it to be safe or effective for cancer. Its ingredients are not recognized as cancer treatments by major health organizations, and using it instead of proven therapies can be harmful.

Cancer is a group of diseases where abnormal cells grow uncontrollably and can invade nearby tissues. These cells may spread to other parts of the body through the blood or lymph systems. There are many types of cancer, including carcinoma, which starts in skin or tissues lining organs. It may also appear under related names such as Malignancy.

Cancer Antigen 125, or CA-125, is a protein found in the blood that can be higher in some people with ovarian cancer and certain other cancers. Doctors mainly use CA-125 blood tests to help monitor how well treatment is working or to check if cancer has returned after treatment. It is not a perfect test and is used together with other exams and tests.

Chinese Weevils (Ulomoides dermestoides), sometimes called Cancer Beetles, are small beetles used in some traditional and alternative medicine practices. They produce natural chemicals studied in labs for effects on cells, but their safety and effectiveness for cancer treatment in people are not proven or recommended by standard medical care. If a record says to see Chinese Weevils (Ulomoides dermestoides), that preferred term should usually be checked as well. It may also appear under related names such as Chinese Weevils; Ulomoides.

Chinese Weevils (Ulomoides dermestoides), sometimes called Cancer Beetles, are small beetles used in some traditional and alternative medicine practices. They produce natural chemicals studied in labs for effects on cells, but their safety and effectiveness for cancer treatment in people are not proven or recommended by standard medical care. If a record says to see Chinese Weevils (Ulomoides dermestoides), that preferred term should usually be checked as well. It may also appear under related names such as Chinese Weevils; Ulomoides.

NANT Cancer Vaccine, also called Cancer BioShield, is an investigational cancer vaccine linked to combination immunotherapy. It aims to activate the immune system by presenting tumor antigens and is part of personalized or platform-based cancer treatment strategies. This approach is experimental and not yet a standard cancer treatment. If a record says to see NANT Cancer Vaccine / Cancer BioShield, that preferred term should usually be checked as well. It may also appear under related names such as NANT Cancer.

Cancer Care: Repurposed Drugs and Metabolic Interventions involves using existing medicines and dietary strategies to support people with cancer. These approaches may help manage symptoms, improve nutrition, and support treatment tolerance or recovery. They are often part of supportive or integrative care but vary in how well they are studied and accepted. Their use depends on the type and stage of cancer and should always be guided by a healthcare team.

A cancer cell line is a group of cancer cells taken from a tumor and grown in a laboratory where they can keep dividing and growing. Scientists use these cells to study cancer and test new treatments in a controlled setting. Cancer cell lines help researchers learn about cancer biology but are not the same as cancer in the body.

A cancer cluster is when more cases of cancer than expected happen in a group of people living near each other over a certain time. Sometimes these clusters occur by chance, but they can also be linked to environmental factors. Health departments investigate suspected clusters to find out if there is a real increase and what might be causing it.

The Cancer Information Service (CIS) is a free and confidential program from the National Cancer Institute that provides easy-to-understand answers to questions about cancer. CIS helps patients, families, and caregivers learn about cancer types, treatments, prevention, clinical trials, and quitting smoking. You can reach CIS by phone or online chat in English or Spanish during weekdays.

The Cancer Intervention and Surveillance Modeling Network (CISNET) is a group of researchers supported by the National Cancer Institute. They use computer models to study how cancer prevention, screening, and treatment programs might affect cancer cases and deaths. Their work helps guide cancer control strategies for common cancers like breast, colorectal, lung, and prostate cancer.

Cancer metabolism describes how cancer cells change the way they use nutrients and energy to grow and survive. Unlike normal cells, many cancer cells rely more on breaking down sugar through a process called glycolysis, even when oxygen is present. Understanding these changes helps researchers explore new treatments that target cancer cells’ unique energy needs.

Cancer metabolism, also called Warburg targeting, describes how cancer cells change the way they produce energy. Unlike normal cells, many cancer cells rely more on breaking down sugar through a process called glycolysis, even when oxygen is present. Researchers study these changes to find new treatments that target cancer cells’ unique energy needs. These approaches are still being researched and are not yet standard cancer treatments.

Cancer MoonShot 2020 Combination Immunotherapy is a cancer treatment approach that uses multiple immunotherapy methods together to help the immune system fight cancer. It is part of standard cancer care, guided by oncology specialists, and tailored to specific cancer types. This approach may also support symptom relief and recovery during treatment.

Cancer of the adrenal cortex is a rare cancer that starts in the outer layer of the adrenal glands, small organs located above each kidney. These glands produce hormones that help control heart rate, blood pressure, and other important body functions. This cancer is also called adrenocortical cancer or adrenocortical carcinoma and can affect hormone levels, requiring specific tests and treatments.

Cancer of Unknown Primary Origin (CUP) is a condition where cancer cells are found in the body, but doctors cannot identify where the cancer first started. This means the original tumor site is unknown, even though the cancer has spread. CUP is also called carcinoma of unknown primary. Understanding this term can help patients and caregivers better navigate diagnosis and treatment options.

Cancer pain management means assessing and treating pain caused by cancer, its treatments, or surgery. It aims to reduce pain and improve comfort and quality of life using medicines, physical therapy, counseling, and other supportive care. This approach helps people during and after cancer treatment to better manage pain and its effects on daily life.

A cancer predisposing gene mutation is a change in certain genes that can increase a person’s chance of developing some types of cancer. These mutations are often inherited from a parent and can run in families. For example, changes in the BRCA1 or BRCA2 genes are linked to higher risks of breast and ovarian cancers. Having such a mutation does not mean cancer is certain, but it may affect prevention and care choices.

A cancer predisposition gene is a gene that, when it has certain changes called mutations, can increase a person’s chance of developing some types of cancer. These gene changes often run in families. For example, mutations in the BRCA1 or BRCA2 genes raise the risk of breast and ovarian cancers. Knowing about these genes can help with cancer prevention, early detection, and treatment planning.

A cancer prevention vaccine is a shot that helps protect your body from viruses linked to certain cancers. In the U.S., vaccines like Gardasil 9 protect against human papillomavirus (HPV), which can cause cancers of the cervix, anus, throat, and others. Another vaccine protects against hepatitis B virus, which can lead to liver cancer. These vaccines work by preventing infections that might cause cancer later in life.

Physical Therapy / Cancer Rehabilitation helps people with cancer manage the physical effects of their illness and treatment. It aims to improve strength, movement, balance, and quality of life through personalized exercise and therapy programs. This care supports recovery and helps patients regain independence during and after cancer treatment. If a record says to see Physical Therapy / Cancer Rehabilitation, that preferred term should usually be checked as well. It may also appear under related names such as Physical Therapy.

A cancer subtype is a smaller group within a main type of cancer, identified by specific features of the cancer cells. These features include how the cells look under a microscope, certain substances found in or on the cells, or changes in the cells’ DNA. Knowing the subtype helps doctors plan treatment and understand what to expect from the cancer.

A cancer susceptibility gene is a gene that, when it has certain inherited changes called mutations, may increase a person’s chance of developing some types of cancer. These gene changes often run in families. For example, mutations in the BRCA1 or BRCA2 genes raise the risk of breast and ovarian cancers. Knowing about these genes can help with cancer prevention, early detection, and treatment planning.

A cancer susceptibility gene mutation is a change in certain inherited genes that can increase a chance of developing some types of cancer. These mutations often run in families, such as changes in BRCA1 or BRCA2 genes linked to breast and ovarian cancers. Having such a mutation raises risk but does not mean cancer is certain. Knowing about these mutations can help guide screening, prevention, and treatment decisions.

Hyperthermia, also called cancer thermal therapy, is a treatment that uses controlled heat to help destroy cancer cells. It is often applied directly to tumors using special technologies like radiofrequency, microwave, or focused ultrasound. Researchers are working on new materials to improve how heat targets tumors and to safely combine heat with other cancer treatments.

A cancer treatment vaccine is a type of immunotherapy that helps your immune system recognize and attack cancer cells. These vaccines may be made from your own tumor cells, special immune cells called dendritic cells, or proteins found on cancer cells. They are used to treat some cancers like prostate cancer and melanoma and are being studied for others.

Cancer-related post-traumatic stress (PTS) is a condition some people develop after a cancer diagnosis. It can cause frightening thoughts, trouble sleeping, feeling alone, or losing interest in daily activities. These symptoms may happen during or after treatment. Support such as counseling, relaxation training, or support groups can help manage these feelings and improve quality of life.

Candidiasis is a yeast infection caused by the overgrowth of Candida albicans, often in warm, moist areas like the mouth. It commonly occurs when the immune system is weakened, such as during cancer treatment. When it affects the mouth, it is called thrush and appears as white patches that may cause discomfort. Though usually limited to the mouth or skin, candidiasis can rarely spread more widely in the body.

Candidosis, also called candidiasis or thrush, is an infection caused by the yeast Candida albicans growing too much in moist areas like the mouth or skin. It often happens when the immune system is weak, such as during chemotherapy or after antibiotics. While it usually affects the mouth, it can rarely spread throughout the body and needs medical care.

Canertinib dihydrochloride, also called CI-1033, is an experimental drug studied for some cancers. It works by blocking proteins called epidermal growth factor receptors (EGFR), which help cancer cells grow. By interfering with these signals, it may slow cancer growth or cause cancer cells to die. It belongs to a group of medicines called tyrosine kinase inhibitors and is still being tested in clinical trials.

Cannabidiol, or CBD, is a natural chemical from the hemp plant that does not cause a “high.” It may help ease pain, reduce inflammation, and lower anxiety. CBD comes in many forms like oils, capsules, and patches. Some forms are approved to treat seizures, and it is being studied for managing cancer symptoms and side effects.

Cannabinoids are natural chemicals found in the marijuana plant that affect the body and brain. The main active cannabinoid, THC, causes the “high” feeling. Cannabinoids may help relieve symptoms like nausea, pain, or loss of appetite caused by cancer or its treatments, but they are not approved to cure cancer.

Cannabis, also called marijuana, is the dried leaves and flowers of the Cannabis plant. It contains natural chemicals called cannabinoids, including THC and CBD, which affect the body and brain. Some people with cancer use cannabis to help manage symptoms like nausea, pain, anxiety, and appetite loss caused by cancer or its treatments. Cannabis is not a cure for cancer and should be used carefully under medical guidance.

Cannabis or CBD oil are products made from the cannabis plant that some people with cancer use to help manage symptoms like pain, nausea, appetite loss, sleep problems, and anxiety. These products are considered complementary and are not replacements for standard cancer treatments. If you are thinking about using cannabis or CBD oil, it’s important to discuss it with your healthcare team to understand potential benefits and risks.

Cancell, also known as Cantron or Protocel, is a liquid mixture once promoted as a cancer treatment. Its ingredients have not been proven to treat or prevent cancer. Since 1989, it has been illegal in the U.S. to make, sell, or distribute Cancell or similar products as treatments. Patients should discuss any interest in these products with their healthcare providers.

CAP-1 is a small piece of a protein called carcinoembryonic antigen (CEA), which can be found in the blood of some people with colon cancer or other conditions. CAP-1 is used to develop vaccines that may help the immune system recognize and attack cancer cells. It is also called carcinoembryonic antigen peptide-1 or CEA peptide-1.

Capecitabine (brand name Xeloda) is a chemotherapy pill used to treat several cancers, including colorectal, breast, esophageal, stomach, and pancreatic cancers. Inside the body, it changes into fluorouracil, a drug that helps stop cancer cells from growing and dividing. Capecitabine can be used alone or with other treatments and is taken by mouth, offering a convenient option in cancer care.

Capillaries are the smallest blood vessels in the body. They connect tiny arteries to tiny veins and have thin, leaky walls that allow oxygen, nutrients, and waste to pass between the blood and body tissues. This exchange supports healthy cells and normal body functions. In cancer care, capillaries help supply tumors with blood and are important for understanding how treatments reach cancer cells.

Capillary Leak Syndrome is a rare condition where tiny blood vessels leak fluid and proteins into nearby tissues. This can cause swelling and dangerously low blood pressure, which may lead to serious problems like organ failure. It can happen during cancer treatment or illness, so careful monitoring is important to catch symptoms early and manage the condition safely.

A capillary malformation is a birthmark made of extra tiny blood vessels near the skin’s surface. It usually looks like a flat pink, red, or purple patch, often on the face or neck. Larger ones are called port-wine stains and may darken or thicken over time. Most capillary malformations do not cause health problems but can sometimes be linked to rare conditions affecting other parts of the body.

Capillary Malformation-Arteriovenous Malformation Syndrome (CM-AVM) is a rare inherited condition that causes small, pink or red spots on the skin, often on the face, arms, or legs. These spots may be present at birth or appear in childhood. The syndrome can also cause more serious blood vessel problems affecting organs like the brain and heart, which may lead to symptoms such as bleeding or seizures.

CAPIRI is a chemotherapy treatment combining two drugs, capecitabine (Xeloda) taken by mouth, and irinotecan given by vein. It is used mainly for colorectal cancer that has spread, as well as advanced esophageal and stomach cancers. This combination attacks cancer cells in different ways to help control cancer growth and improve treatment effectiveness. It is also called CAPIRI regimen, XELIRI, or XELIRI regimen.

The CAPIRI regimen is a chemotherapy treatment combining two drugs, capecitabine (Xeloda) taken by mouth and irinotecan given by vein. It is mainly used to treat colorectal, esophageal, and stomach cancers that have spread to other parts of the body. This combination attacks cancer cells in different ways to help control cancer growth and improve treatment effectiveness.

Capivasertib (brand name Truqap) is a targeted cancer drug used with fulvestrant to treat adults with hormone receptor-positive, HER2-negative breast cancer that has spread and has certain gene changes (PIK3CA, AKT1, or PTEN). It is for patients whose cancer returned or worsened during or after hormone therapy. Capivasertib works by blocking a protein involved in cancer cell growth and survival and is being studied for other cancers.

Caplacizumab (brand name Cablivi) is a medicine used with plasma exchange and immunosuppressive therapy to treat acquired thrombotic thrombocytopenic purpura (aTTP), a rare blood disorder where small clots form in tiny blood vessels. It works by binding to a protein called von Willebrand factor (VWF) to help prevent harmful clots from forming. Caplacizumab is a type of very small antibody called a nanobody.

Capmatinib hydrochloride, also known as Tabrecta, is a targeted medicine used to treat adults with a type of lung cancer called non-small cell lung cancer (NSCLC) that has spread and has a specific change in the MET gene. It works by blocking a protein made by this gene, which may help slow or stop cancer growth. It is being studied for other cancers as well.

CAPOX is a chemotherapy treatment combining two drugs, capecitabine (a pill) and oxaliplatin (given by vein), mainly used to treat advanced colorectal cancer. This combination attacks cancer cells in different ways to improve effectiveness. CAPOX may also be studied for other cancers and is sometimes called the CAPOX regimen. Your healthcare team can explain if this treatment is right for you and what side effects to expect.

CAPOX is a chemotherapy treatment combining two drugs, capecitabine (a pill) and oxaliplatin (given through a vein). It is mainly used to treat advanced colorectal cancer by attacking cancer cells in different ways. CAPOX may also be studied for other cancers. Your healthcare team can explain if this treatment is right for you and what side effects to expect.

Caprelsa (also called vandetanib) is a medicine used to treat medullary thyroid cancer that cannot be removed by surgery or has spread to other parts of the body. It works by blocking proteins that help cancer cells grow and by stopping the growth of new blood vessels tumors need to survive. Caprelsa is a targeted therapy and is being studied for other cancers as well.

Capromab pendetide, also known as ProstaScint, is a special substance used to help find prostate cancer cells in the body. It combines an antibody that attaches to prostate cells with a small amount of radioactive material. After injection, a special camera detects the radiation to locate cancer cells, helping doctors with diagnosis and treatment planning.

Capsaicin is a natural substance found in spicy plants like cayenne and red peppers. It is often used in creams or patches applied to the skin to help relieve nerve pain. In cancer care, capsaicin is being studied for easing painful mouth sores caused by chemotherapy and radiation treatments. This entry helps connect the word with diagnoses, testing, treatments, supportive care, research notes, protocols, media, books, people, organizations, and safety concerns.

In medicine, a capsule can mean two things: a thin layer of tissue and blood vessels that surrounds an organ, joint, or tumor, or a small, easy-to-swallow container made of gelatin that holds medicine. Knowing the difference helps patients understand discussions about cancer tests, treatments, and medications. This entry helps connect the word with diagnoses, testing, treatments, supportive care, research notes, protocols, media, books, people, organizations, and safety concerns.

A capsule endoscope is a small, pill-sized device with a camera and light that you swallow to take pictures inside your digestive tract. It sends images wirelessly to a recorder you wear, helping doctors see parts of your intestines without using traditional scopes. The capsule passes naturally during a bowel movement, and the pictures help find signs of disease or problems inside your digestive system.

Capsule endoscopy is a test where you swallow a small pill-sized camera that takes pictures inside your intestines. The camera sends images to a recorder you wear, helping doctors find problems like bleeding, inflammation, or growths without using traditional scopes. The capsule passes naturally during a bowel movement, making this a painless and less invasive way to look inside your digestive tract.

Captopril is a medicine mainly used to treat high blood pressure. It belongs to a group called ACE inhibitors, which help relax blood vessels. In cancer care, captopril is being studied to see if it can help prevent side effects from radiation therapy, but it is not a cancer treatment itself.

CAR, or chimeric antigen receptor, is a lab-made protein added to a patient’s immune cells called T cells. This change helps these cells better recognize and attack cancer cells with specific proteins. The modified cells, called CAR T cells, are grown in the lab and given back to patients to help fight certain cancers. CAR T cell therapy is an emerging treatment being studied for some types of cancer.

CAR T-cell therapy is a treatment that changes a patient’s own immune cells, called T cells, in a lab so they can better find and attack cancer cells. These modified cells are then given back to the patient through an infusion. This therapy is mainly used for certain blood cancers and is being studied for other types of cancer.

Carac is a prescription cream containing fluorouracil, used to treat actinic keratosis—a skin condition caused by sun damage that can sometimes develop into skin cancer. It works by stopping abnormal skin cells from growing and helps remove damaged cells before they turn into cancer. Carac is applied directly to the affected skin as directed by a healthcare provider.

Carbamide, also called urea, is a natural waste product made when the liver breaks down protein. The kidneys remove carbamide from the blood and send it into the urine. Carbamide can also be made in a lab. A cream containing carbamide is being studied to help treat hand-foot syndrome, a side effect some cancer patients experience with certain treatments.

Carbendazim is a chemical originally used to stop fungal growth, mainly in plants. Researchers are studying it for possible effects on cancer cells, but it is not a common or approved cancer treatment. Patients may hear about it in research or clinical trials, but it is not routinely used in cancer care today.

The Carbo-Tax Regimen is a chemotherapy treatment that combines two drugs, carboplatin and paclitaxel (Taxol). It is commonly used to treat cancers such as ovarian, endometrial (uterine lining), head and neck, and advanced non-small cell lung cancer. This combination works by attacking cancer cells in different ways and is often part of a larger cancer treatment plan.

Carbogen is a special gas mixture containing more oxygen and some carbon dioxide than regular air. It is inhaled to increase oxygen levels in the body’s tissues, including cancer cells. Carbogen is being studied as a radiosensitizing agent, which means it may help radiation therapy work better by making cancer cells more sensitive to radiation. It is not yet a standard cancer treatment and is mainly used in research or clinical trials.

Carbohydrates are sugar molecules found in many foods, ranging from simple sugars like glucose to complex forms like starch and fiber. They provide energy for the body and are important in cancer care for nutrition and treatment support. Understanding carbohydrates can help manage energy, weight, and side effects during cancer treatment.

Carbolic acid, also called phenol, is a poisonous chemical made from tar and found in some plants and essential oils. It has been used to make plastics, medicines, and to kill germs. In cancer care, you might hear about carbolic acid when discussing chemical safety or ingredients in certain products. Knowing about it can help you understand medical information, but it does not mean it is part of your treatment or causes cancer.

Carbon C 11-acetate, also called 11C-acetate, is a radioactive substance used in PET scans to help find cancer in the body. Cancer cells absorb more of it than normal cells, making tumors easier to see. It is still being studied and is not yet a routine test everywhere but may be used in specialized centers or research.

Carbon C 11-choline, also called 11C-choline, is a small amount of radioactive choline used in PET scans to help find certain cancers. Cancer cells absorb more of this substance than normal cells, so the scan highlights areas where cancer might be present. It is a special imaging tool that helps doctors locate tumors, check for spread, or monitor treatment, though it is not used for all cancers or available everywhere.

A Carbon C 11-Choline PET-CT scan is a medical imaging test that uses a small amount of radioactive choline injected into a vein. Cancer cells absorb more choline than normal cells, so the scan helps doctors find and locate cancer by showing where this substance collects in the body. It combines PET and CT imaging to create detailed pictures and is often used to detect cancer spread or check treatment response.

Carbon dioxide is a colorless, odorless gas your body makes as a waste product. It travels in your blood from your tissues to your lungs, where you breathe it out. Carbon dioxide levels help show how well your lungs and body are working, which can be important during cancer care.

Carbon monoxide is a colorless, odorless, and poisonous gas produced when fuels like gas, wood, or tobacco burn. It reduces the blood’s ability to carry oxygen, which is vital for all cells and tissues. Exposure to carbon monoxide is a health risk, especially for people with cancer or lung problems, and is often linked to smoking and secondhand smoke.

Carboplatin is a chemotherapy drug mainly used to treat advanced ovarian cancer, especially when first diagnosed or if it returns after earlier treatments. It works by damaging cancer cells’ DNA to stop their growth and cause cell death. Carboplatin is similar to cisplatin but usually causes fewer side effects. It is also being studied for other cancers.

The Carboplatin-Paclitaxel-Bevacizumab Regimen is a combination of three drugs used to treat advanced nonsquamous non-small cell lung cancer. It includes carboplatin, paclitaxel (also called Taxol), and bevacizumab. This treatment aims to slow cancer growth and help manage symptoms in certain lung cancer patients. It may also appear under related names such as Carboplatin-Taxol-Bevacizumab Regimen.

Carboplatin-Taxol is a chemotherapy treatment combining two drugs, carboplatin and paclitaxel (Taxol). It is commonly used to treat cancers such as ovarian, endometrial, head and neck, and certain lung cancers that have spread. This combination attacks cancer cells in different ways to help slow or stop their growth. It may also appear under related names such as Carbo-Tax Regimen, Carboplatin-Taxol Regimen, And PC Regimen.

The Carboplatin-Taxol Regimen is a chemotherapy treatment that combines two drugs, carboplatin and paclitaxel (Taxol). It is commonly used to treat cancers such as ovarian, endometrial (uterine lining), head and neck cancers, and certain lung cancers that have spread. This combination works by attacking cancer cells in different ways to help slow or stop their growth.

The Carboplatin-Taxol-Bevacizumab regimen is a combination of three drugs used to treat advanced nonsquamous non-small cell lung cancer. It includes carboplatin and paclitaxel (Taxol), which are chemotherapy medicines, and bevacizumab, a targeted therapy. This treatment aims to slow cancer growth and help manage symptoms in certain lung cancer patients. It may also appear under related names such as Carboplatin-Paclitaxel-Bevacizumab Regimen.

Carboxyamidotriazole is a cancer drug that works by blocking the growth of new blood vessels tumors need to grow. It belongs to a group called angiogenesis inhibitors and may be used to help slow or stop tumor growth as part of cancer treatment plans. This entry helps connect the word with diagnoses, testing, treatments, supportive care, research notes, protocols, media, books, people, organizations, and safety concerns.

Carboxypeptidase-G2, also known as glucarpidase or Voraxaze, is a medicine used to quickly lower dangerous levels of the cancer drug methotrexate in the blood. It works by breaking down methotrexate, especially in adults and children whose kidneys are not working well, helping to prevent serious side effects during cancer treatment.

Carcinoembryonic antigen (CEA) is a protein found in the blood that can be higher in people with certain cancers, such as colon cancer, other diseases, or in smokers. Doctors measure CEA levels to help monitor cancer treatment or check if cancer has returned. It is one of several tumor markers used in cancer care but is not a test to diagnose cancer on its own.

A carcinoembryonic antigen assay (CEA assay) is a blood test that measures the level of carcinoembryonic antigen (CEA), a protein that may be higher in people with certain cancers like colon cancer, some other diseases, or smokers. Doctors often use this test to help monitor cancer treatment or check if cancer has returned.

Carcinoembryonic Antigen Peptide-1 (CAP-1) is a small piece of a protein called carcinoembryonic antigen (CEA), which can be found in the blood of some people with certain cancers, like colon cancer, or other conditions. CAP-1 is used to develop vaccines that may help the immune system recognize and attack cancer cells.

A carcinogen is any substance or agent that can cause cancer by damaging cells or changing how they grow. Carcinogens include chemicals, certain types of radiation, and some viruses. People may encounter carcinogens in daily life, such as tobacco smoke, sunlight, or workplace exposures. Knowing about carcinogens can help you reduce your cancer risk by avoiding or limiting contact when possible.

Carcinogenesis is the process where normal cells change and become cancer cells. This happens because of changes in the cells’ DNA that cause them to grow and divide uncontrollably. Understanding carcinogenesis helps explain how cancer starts and why it behaves differently from healthy tissue. This entry helps connect the word with diagnoses, testing, treatments, supportive care, research notes, protocols, media, books, people, organizations, and safety concerns.

Carcinoid syndrome is a group of symptoms caused by hormones released from rare, slow-growing carcinoid tumors, usually found in the digestive tract or lungs. Symptoms include flushing of the face and chest, diarrhea, breathing difficulties, fast heartbeat, and sudden low blood pressure. These symptoms happen when the tumor releases substances like serotonin into the bloodstream.

A carcinoid tumor is a slow-growing tumor most often found in the digestive system, especially the small intestine and rectum, but sometimes in the lungs or other areas. These tumors can spread to other parts of the body and may release substances that cause symptoms called carcinoid syndrome. This entry helps connect the word with diagnoses, testing, treatments, supportive care, research notes, protocols, media, books, people, organizations, and safety concerns.

Carcinoma is a common type of cancer that starts in the skin or the lining of internal organs. It includes many cancers like lung, breast, and colon cancer. Knowing this term helps you understand where the cancer began and how it might affect your body. This entry helps connect the word with diagnoses, testing, treatments, supportive care, research notes, protocols, media, books, people, organizations, and safety concerns.

Carcinoma in situ is an early condition where abnormal cells that look like cancer are found only in the place they first formed and have not spread to nearby tissues. Sometimes called stage 0 disease, it can occur in organs like the breast, skin, cervix, lungs, or mouth. While not invasive cancer yet, it may develop into cancer if untreated, so doctors often recommend treatment or close monitoring.

Carcinoma of Unknown Primary (CUP) is a type of cancer where cancer cells are found in the body, but doctors cannot locate where the cancer first started. The original tumor site remains unknown even though the cancer has spread to other parts of the body. CUP is also called cancer of unknown primary origin.

Carcinomatosis, also called carcinosis, is a serious condition where cancer cells spread widely from the original tumor, forming many tumors across a large area or throughout the body. It often means the cancer is advanced and may be harder to treat. Common types affect the brain coverings, lungs, or the lining of the abdomen.

Carcinomatous lymphangitis is a serious condition where cancer cells spread from the original tumor into the lymph vessels, causing blockage. This usually happens in the lungs and can occur with many types of cancer, especially breast, lung, colon, stomach, pancreas, or prostate cancers. It can affect symptoms like breathing and influence treatment choices.

Carcinomatous meningitis is a serious condition where cancer cells spread from the original tumor to the meninges, the thin layers of tissue covering the brain and spinal cord. This can cause inflammation and increased pressure in the brain. It most often occurs in cancers like breast cancer, lung cancer, or melanoma.

Carcinosarcoma is a rare cancer made up of two types of cancer cells: carcinoma, which starts in skin or tissues lining organs, and sarcoma, which begins in connective tissues like bone, cartilage, or fat. Because it contains both types, this mixed tumor can behave differently from other cancers and may require special care.

Carcinosis, also called carcinomatosis, is a serious condition where cancer cells spread from the original tumor to form many tumors across a large area or throughout the body. It often means the cancer is advancing and may be harder to treat. Common types affect the brain coverings, lungs, or the lining of the abdomen.

Carcinostatic means slowing down or stopping the growth of cancer cells. It describes treatments or substances that help control cancer by preventing it from growing or spreading quickly. Understanding this term can help patients and caregivers follow discussions about cancer care and treatment options. This entry helps connect the word with diagnoses, testing, treatments, supportive care, research notes, protocols, media, books, people, organizations, and safety concerns.

Carctol is an herbal mixture of eight plants used in Ayurvedic medicine and promoted with dietary changes for people with cancer. While some claim it helps treat cancer or reduce treatment side effects, there is no scientific evidence supporting these claims. Its safety and effectiveness are not proven, and it may interact with cancer treatments or affect liver and kidney health. Always discuss any herbal supplements like Carctol with your cancer care team.

The cardia is the part of the stomach closest to the esophagus. It serves as the entry point where food and liquids pass from the esophagus into the stomach. A nearby valve helps prevent stomach contents from flowing back up into the esophagus. Knowing about the cardia is important in understanding certain stomach or esophageal conditions, including some cancers.

Cardiac means related to the heart. In cancer care, it refers to anything involving the heart, such as heart health, heart tests, or heart-related side effects from treatments. Knowing this term helps you understand when your heart might be affected during diagnosis, treatment, or follow-up care. This entry helps connect the word with diagnoses, testing, treatments, supportive care, research notes, protocols, media, books, people, organizations, and safety concerns.

Cardiac catheterization is a medical procedure where a thin, flexible tube called a catheter is inserted into a blood vessel and guided to the heart. It helps doctors check how well the heart is working, find blockages or defects, and sometimes treat heart problems during the same visit. It is often used when other tests suggest heart issues.

A cardiac pacemaker is a small, battery-powered device placed under the skin near the collarbone to help control a slow or irregular heartbeat. It monitors the heart’s rhythm and sends gentle electrical signals through thin wires to keep the heart beating steadily. Also called an artificial pacemaker or simply a pacemaker, it supports heart function, especially when cancer treatments affect the heart.

Cardiac sarcoma, also called heart cancer, is a very rare cancer that starts in the heart’s muscle or connective tissue. It can affect how the heart works and may cause symptoms like chest pain or irregular heartbeat. Because it is uncommon, diagnosis and treatment often require specialized care and tests such as imaging and biopsy.

Cardiac tamponade, also called pericardial tamponade, is a serious condition where extra fluid or blood builds up around the heart. This pressure keeps the heart from pumping enough blood to the body. It can happen due to cancer, infections, injuries, or treatments affecting the chest. Immediate medical care is needed to prevent life-threatening complications like shock or organ failure.

Cardin, also called blessed thistle or holy thistle, is a plant used in some cultures for health purposes. It may have anti-inflammatory and anticancer effects, but these are not proven or part of standard cancer treatment. People exploring natural or complementary therapies related to cancer might hear about Cardin. Always talk with your healthcare team before using it to ensure safety and avoid interactions with cancer treatments.

Cardiofaciocutaneous (CFC) syndrome is a rare genetic condition that affects the heart, face, and skin. People with CFC often have delays in growth, development, and learning. Common signs include heart defects, unusual facial features, an abnormally large head, and skin and eye problems. It is caused by changes in certain genes involved in cell growth and communication.

A cardiologist is a doctor specially trained to diagnose and treat diseases of the heart and blood vessels. They help manage heart conditions and monitor heart health, especially during cancer treatment when some therapies can affect the heart. This entry helps connect the word with diagnoses, testing, treatments, supportive care, research notes, protocols, media, books, people, organizations, and safety concerns.

Cardiology is the medical specialty focused on the heart and blood vessels. It involves diagnosing and treating heart conditions like irregular heartbeats, coronary artery disease, and heart failure. For cancer patients, cardiology is important because some cancer treatments can affect heart health. Doctors may monitor your heart before, during, and after treatment to help keep your heart safe.

Cardiopulmonary refers to anything involving the heart and lungs. In cancer care, it often relates to conditions or side effects affecting these organs, such as trouble breathing or fluid buildup. Knowing about cardiopulmonary issues can help patients and caregivers recognize symptoms and talk with their healthcare team. This entry helps connect the word with diagnoses, testing, treatments, supportive care, research notes, protocols, media, books, people, organizations, and safety concerns.

Cardiopulmonary resuscitation (CPR) is an emergency procedure used to restart a person’s heartbeat and breathing if they stop. It involves pressing firmly and quickly on the chest to keep blood flowing and often includes giving breaths to help oxygen reach the lungs. CPR can be lifesaving in sudden medical emergencies.

Cardiotoxicity means damage or harmful effects on the heart caused by certain cancer treatments or medicines. It can affect how well the heart works and may lead to symptoms like tiredness, shortness of breath, or irregular heartbeats. Doctors watch for cardiotoxicity during and after cancer care to protect heart health and adjust treatment if needed.

Cardiovascular refers to the heart and blood vessels, which work together to circulate blood throughout your body. In cancer care, this term relates to how cancer or its treatments might affect your heart and circulation. Understanding cardiovascular health helps you recognize why your care team monitors your heart during and after treatment to protect your overall well-being.

Cardiovascular disease, also called heart disease, includes conditions that affect the heart and blood vessels. Common types are coronary artery disease, which can cause chest pain, heart attacks, or stroke. Risk factors include smoking, high blood pressure, high cholesterol, unhealthy diet, lack of exercise, and obesity. It is important in cancer care because some treatments can affect the heart, and existing heart problems may influence treatment choices.

Cardura, also called doxazosin mesylate, is a medicine used to treat high blood pressure and urinary problems caused by an enlarged prostate. It works by relaxing muscles in blood vessels and the prostate, helping blood flow and making urination easier. Cardura belongs to a group of drugs called alpha blockers and is not a cancer treatment but may be used to manage symptoms during cancer care.

A caregiver is someone who helps a person who needs support with daily activities because of illness, disability, or age. Caregivers can be family, friends, or paid professionals. They assist with tasks like bathing, cooking, managing medicines, and offering emotional support, often at home or in healthcare settings. This entry helps connect the word with diagnoses, testing, treatments, supportive care, research notes, protocols, media, books, people, organizations, and safety concerns.

Carfilzomib (brand name Kyprolis) is a medicine used to treat adults with multiple myeloma, a blood cancer, especially when the cancer has returned or did not improve after other treatments. It works by blocking enzymes called proteasomes, which helps stop cancer cells from growing and may kill them. Carfilzomib can be given alone or with other drugs and is also being studied for other cancers.

The carina of the trachea is a ridge inside the windpipe where it splits into the right and left main bronchi, the large airways leading to each lung. It serves as a dividing point between these two main air passages. This term often comes up in lung-related medical discussions, including cancer care, to describe the location of tumors or airway changes.

Carmustine, also called BCNU or BiCNU, is a chemotherapy drug used to treat certain brain tumors, Hodgkin lymphoma, non-Hodgkin lymphoma, and multiple myeloma. It works by damaging cancer cells’ DNA to help stop their growth or kill them. Carmustine may be given alone or with other medicines and is also being studied for other cancers.

Carmustine implant is a small, thin wafer containing the chemotherapy drug carmustine. It is placed directly into the brain during surgery where a tumor was removed. The implant slowly releases the drug to help treat certain aggressive brain tumors, such as high-grade gliomas and recurrent glioblastoma. It is often used alongside surgery and radiation therapy and may cause fewer side effects than traditional chemotherapy.

Carney Complex, also called Carney Syndrome, is a rare inherited condition that causes dark spots on the skin and tumors in the heart, hormone-producing glands, skin, and nerves. These tumors are usually noncancerous but may need monitoring. It involves changes in certain genes and can affect several body systems. It may also appear under related names such as Carney Syndrome.

Carney Dyad is a rare inherited condition that causes two types of tumors: gastrointestinal stromal tumors (GISTs) in the digestive system and paragangliomas, which are tumors from nerve tissue in the head, neck, or torso. Knowing about this condition helps guide care, monitoring, and genetic counseling for patients and their families.

Carney Syndrome, also called Carney Complex, is a rare inherited condition that causes dark spots on the skin and tumors in the heart, hormone-producing glands, skin, and nerves. These tumors are usually noncancerous but may need monitoring. It involves changes in certain genes and can affect several body systems. It may also appear under related names such as Carney Complex.

Carney Triad is a very rare condition that causes three main types of tumors: in the stomach, in nerve tissue in the head, neck, or torso, and in lung cartilage. It mostly affects young females and can sometimes involve tumors in the adrenal glands and esophagus. Knowing about Carney Triad helps explain why doctors may check for tumors in different body areas and why careful follow-up is important.

Carney-Stratakis Dyad is a rare inherited condition that causes two types of tumors: gastrointestinal stromal tumors (GISTs) in the stomach or intestines, and paragangliomas, which are tumors from nerve tissue in the head, neck, or torso. Recognizing this condition helps guide diagnosis, monitoring, and care for patients and their families.

Carney-Stratakis Syndrome is a rare inherited condition that causes two types of tumors: gastrointestinal stromal tumors (GISTs) in the digestive system and paragangliomas, which are tumors from nerve tissue in the head, neck, or torso. Knowing about this syndrome helps guide diagnosis, monitoring, and care for patients and their families.

Carnitine is a natural substance made in your muscles and liver and found in foods like meat, fish, and dairy. It helps your body’s cells turn fat into energy. In cancer care, carnitine is important because it relates to how your body uses energy and nutrition during treatment and recovery.

Carnitor, also called L-carnitine or levocarnitine, is a natural substance made by the body and found in foods like meat and fish. It helps the body produce energy by turning fat into fuel. Carnitor is also a medicine used when the body doesn’t make enough carnitine. Researchers are studying it to see if it can protect healthy tissues from damage caused by chemotherapy.

Carotenoids are natural pigments that give many fruits and vegetables their yellow, red, or orange colors. Found in foods like carrots, sweet potatoes, and leafy greens, some carotenoids can be converted by the body into vitamin A. They act as antioxidants and are being studied for their possible role in cancer prevention, but they are not treatments or cures for cancer.

The carotid arteries are two large blood vessels on each side of your neck that carry oxygen-rich blood from your heart to your head. Each artery splits into two branches: one supplies blood to your brain and eyes, and the other supplies blood to your face, tongue, and outer head. These arteries are important for brain health and may be involved in conditions affecting blood flow or cancer treatments near the neck.

A carrier is a person who has one copy of a gene change linked to a disease but usually does not have symptoms. Carriers can pass this gene change to their children. If a child inherits the changed gene from both parents, they may develop the related disease. Knowing carrier status can help guide health decisions and family planning.

A carrier oil is a gentle, nearly scent-free oil used to dilute essential oils, which are strong plant extracts. This makes essential oils safer and easier to apply to the skin. Carrier oils are often mentioned in cancer care when discussing complementary therapies or skin care routines but do not treat cancer themselves.

cART, or combination antiretroviral therapy, is a treatment for HIV that uses three or more medicines together. It helps stop HIV from making copies of itself, protecting the immune system and slowing progression to AIDS. cART also lowers the chance of passing HIV to others, including from mother to baby during childbirth. It supports immune health, which can be important for people with HIV who have cancer.

Cartilage is a tough but flexible tissue found in joints, the nose, ears, and voice box. It supports and shapes these areas while cushioning bones in joints. Some rare cancers, like chondrosarcoma, start in cartilage. Knowing about cartilage can help patients understand their diagnosis and treatment better. This entry helps connect the word with diagnoses, testing, treatments, supportive care, research notes, protocols, media, books, people, organizations, and safety concerns.

Carvedilol phosphate, also known as Coreg, is a medicine used to treat high blood pressure and certain heart problems. It works by blocking nerve signals and helping blood vessels widen. In cancer care, it is being studied to help prevent or reduce heart-related side effects caused by some cancer treatments. It supports heart health but is not a cancer treatment itself.

Carvykti (also called ciltacabtagene autoleucel) is a treatment for adults with multiple myeloma that has returned or not improved after certain prior therapies. It uses specially changed immune cells to help the body attack myeloma cancer cells, especially when other treatments like lenalidomide have not worked. It may also appear under related names such as Ciltacabtagene Autoleucel.

Carzelesin is a chemotherapy drug that belongs to a group called alkylating agents. It works by damaging the DNA of cancer cells to help stop their growth. Carzelesin may be used in certain cancer treatments or studied in clinical trials. Knowing about this drug can help patients and caregivers understand treatment discussions and options.

A Case Management Nurse, also called a Nurse Case Manager, is a registered nurse specially trained to plan, manage, and coordinate all parts of a patient’s care. They help patients, especially those with long-term treatments like cancer, by organizing appointments, treatments, and support services to make care smoother and easier to understand.

A case report is a detailed story about one patient’s cancer diagnosis, treatment, and follow-up care. It includes basic information like age and gender and helps doctors and researchers learn from individual experiences. Case reports provide insight into how a specific cancer was managed but focus on just one person’s journey.

A case series is a collection of detailed reports about patients who received similar treatment for the same condition. These reports include information like age, gender, diagnosis, treatment given, how patients responded, and follow-up details. Case series help doctors and researchers learn from real patient experiences but do not prove that one treatment is better than another.

A case-control study is a type of research that compares two groups of people: those who have a disease or condition (cases) and a similar group who do not (controls). Researchers look back at their medical and lifestyle histories to find factors that might be linked to the disease. This kind of study is also called a retrospective study.

Casodex, also called bicalutamide, is a medicine used with other treatments to help control prostate cancer that has spread. It works by blocking androgen receptors in cancer cells, which respond to male hormones and may encourage cancer growth. Casodex is part of hormone therapy and is being studied for other cancers.

Caspofungin Acetate is a medicine used to prevent or treat fungal infections, especially in people with weakened immune systems such as some cancer patients. It belongs to a group of antifungal drugs that help stop fungi from growing and spreading in the body. This entry helps connect the word with diagnoses, testing, treatments, supportive care, research notes, protocols, media, books, people, organizations, and safety concerns.

Castleman disease is a rare condition where noncancerous growths develop in lymph nodes. It can affect a single group of lymph nodes (unicentric) or multiple groups throughout the body (multicentric). Unicentric disease often causes no symptoms, while multicentric disease may cause fever, weight loss, and fatigue. People with Castleman disease have a higher risk of developing lymphoma, a type of lymph node cancer.

Castor oil packs are cloths soaked in castor oil and placed on the skin, often over the abdomen. Used in some naturopathic and cancer-support settings, they aim to promote comfort, support digestion or lymph flow, relieve constipation, or encourage relaxation. There is no strong scientific evidence that castor oil packs treat cancer itself, so they should be seen as a complementary approach, not a replacement for standard cancer treatments.

Castrate-Resistant Prostate Cancer (CRPC) is prostate cancer that keeps growing even when testosterone levels in the body are very low. Unlike early prostate cancers that need normal testosterone to grow, CRPC can continue to grow despite hormone therapies that lower testosterone. This stage of prostate cancer often requires different treatment approaches.

Castrate-sensitive prostate cancer is a type of prostate cancer that needs male hormones called androgens, like testosterone, to grow. Lowering or blocking these hormones often stops the cancer from growing. This form is common in early-stage prostate cancer and is usually treated with hormone therapy that reduces androgen levels or blocks their effects.

Castration is the removal or destruction of the testicles in men or ovaries in women to lower hormone levels that can help some cancers grow. It can be done by surgery, radiation, or drugs. Medical castration uses medicines to stop these organs from working without surgery. This approach is often part of hormone therapy for cancers like prostate or certain breast cancers.

A CAT scan, also called a CT scan, is a painless imaging test that uses X-rays and a computer to take detailed 3-D pictures of the inside of your body. It helps doctors find tumors, plan treatments, and check how well treatments are working. Sometimes, a special dye is used to make certain areas clearer.

Catapres, also called clonidine hydrochloride, is a medicine mainly used to lower high blood pressure by relaxing blood vessels. In cancer care, it may also be studied to help manage certain types of cancer-related pain and to support quitting smoking. It is not a cancer treatment but can be part of symptom management or overall health care during cancer treatment.

A cataract is when the clear lens inside your eye becomes cloudy, causing blurry or dim vision. It often develops slowly with age and can make it hard to see well, especially at night or in bright light. Cataracts are common and can be treated with surgery to restore clearer sight.

Catch-up vaccination means giving vaccines to people who missed them at the usual age. This includes those who never started, missed doses, or didn’t finish a vaccine series. It’s often used to protect people at higher risk of infections, such as some cancer patients or those with weakened immune systems, helping to reduce infection risks during or after cancer treatment.

Catechin is a natural antioxidant found mainly in tea leaves. It helps protect your cells from damage caused by free radicals—unstable molecules made during normal cell processes. Because this cell damage may increase the risk of cancer and other diseases, catechins are being studied for their possible role in cancer prevention and treatment. However, they are not a substitute for medical care.

Catechol is a natural chemical first found in mimosa trees. It has been used in medicine as an astringent to tighten tissues and as an antiseptic to help prevent infection. Catechol also has industrial uses, such as in photography and electroplating. In cancer care, catechol may appear in research or treatment discussions but is not itself a cancer treatment or diagnosis.

Catecholamines are natural chemicals made by nerve cells that help the body respond to stress. They include dopamine, epinephrine (adrenaline), and norepinephrine. High levels can raise blood pressure and cause symptoms like headaches, sweating, a fast heartbeat, chest pain, and anxiety. Some rare tumors can affect catecholamine levels, making these chemicals important in certain cancer care situations.

A catheter is a thin, flexible tube used to deliver fluids into the body or remove fluids from it. In cancer care, catheters help give treatments like chemotherapy or assist with symptoms such as difficulty urinating. The type and use of a catheter depend on your treatment plan and needs.

Cause-specific survival (CSS) measures the time from a cancer diagnosis or start of treatment until death caused by that cancer. It does not count deaths from other causes. This helps doctors and patients understand how well treatments work by focusing only on deaths related to the cancer itself. It may also appear under related names such as CSS.

To cauterize means to destroy tissue using heat, cold, electricity, or chemicals. This method is often used during cancer treatment or surgery to remove small tumors or to stop bleeding by sealing blood vessels safely and effectively. This entry helps connect the word with diagnoses, testing, treatments, supportive care, research notes, protocols, media, books, people, organizations, and safety concerns.

A cavitation bubble cloud is a group of tiny bubbles created by special ultrasound pulses during a treatment called histotripsy. These bubbles rapidly expand and collapse, mechanically breaking apart targeted tissue without using heat or surgery. This method is mainly used to treat certain liver tumors by destroying them in a precise, noninvasive way.

A cavity is a hollow space or hole in the body. It can be a natural space, like the nasal cavity near your nose, or a hole caused by damage, such as a cavity in a tooth from decay. The meaning depends on the medical context, so it’s important to understand how it applies to your care.

A CBC, or complete blood count, is a common blood test that measures the numbers of red blood cells, white blood cells, and platelets. It also checks hemoglobin and hematocrit levels. This test helps doctors diagnose and monitor many health conditions, including infections, anemia, and blood cancers. It may also appear under related names such as Blood Cell Count, Complete Blood Count, And Full Blood Count.

A CBC with differential is a blood test that counts your red blood cells, white blood cells, and platelets. It also breaks down the types of white blood cells, like neutrophils and lymphocytes. This test helps doctors check for infections, anemia, and other health issues, especially during cancer treatment. It may also appear under related names such as Blood Cell Count With Differential.

CBD, or cannabidiol, is a natural chemical from the hemp plant that contains very low levels of THC, the part of marijuana that causes a “high.” It may help ease pain, reduce inflammation, and lower anxiety without mind-altering effects. CBD comes in oils, capsules, patches, and other forms. It is being studied for managing symptoms related to cancer and its treatment.

Cannabis/CBD oil is made from cannabis plants and contains natural compounds called cannabinoids, mainly cannabidiol (CBD) and sometimes THC. People with cancer may use these oils to help manage symptoms like pain, nausea, muscle spasms, or appetite loss. While some research suggests possible benefits, evidence is limited, and these products are not approved cancer treatments. Always discuss use with your healthcare team to ensure safety and proper care.

A Clinical Breast Exam (CBE) is a physical check of the breasts done by a health care provider. The provider feels the breast tissue and underarm area to find lumps or unusual changes. It helps detect breast changes early, but it is not a complete screening test. Mammograms and other imaging tests are usually needed alongside a CBE for effective breast cancer screening.

CBT, or cognitive behavioral therapy, is a type of talk therapy that helps people change negative thoughts and feelings to improve how they cope and behave. It is often used to support emotional health during cancer treatment, helping with anxiety, depression, stress, and sleep problems. It may also appear under related names such as Cognitive Behavior Therapy, Cognitive Therapy.

CBT-1 is a natural substance from plants being studied to help cancer drugs work better. It may help overcome drug resistance by blocking a protein called P-glycoprotein, which cancer cells use to pump out chemotherapy drugs and avoid being killed. CBT-1 is not yet a standard treatment but is being researched in clinical trials for cancers that stop responding to usual therapies.

Cc stands for cubic centimeter, a unit of volume in the metric system equal to one milliliter (mL). In cancer care, cc is often used to describe amounts of fluids, medications, or tissue sizes. Knowing this term helps patients understand treatment plans, medication doses, and medical reports more clearly. It may also appear under related names such as Cubic Centimeter, Milliliter, And Ml.

CC-1088 is an experimental drug being studied for cancer treatment. It belongs to a group called angiogenesis inhibitors, which work by blocking new blood vessel growth that tumors need to grow. Related to thalidomide but not the same, CC-1088 is not yet approved for routine use and is mainly seen in research settings.

CC-4047, also called pomalidomide or Pomalyst, is a medicine used to treat certain adult cancers like multiple myeloma and Kaposi sarcoma. It helps the immune system fight cancer and may stop tumors from growing new blood vessels. It can be given alone or with other drugs and is available through a special safety program due to important risks.

CC-49 is a laboratory-made monoclonal antibody designed to recognize and attach to certain cancer cells. It can help doctors detect cancer or deliver treatments directly to tumors. You might hear about CC-49 in test results, treatment plans, or clinical trials, but its use depends on your specific cancer and care situation.

CC-5013, also called lenalidomide or Revlimid, is a medicine used to treat certain blood cancers and related conditions in adults. It helps the immune system fight cancer cells and may block blood vessel growth that tumors need. It is often given alone or with other drugs for diseases like follicular lymphoma, mantle cell lymphoma, marginal zone lymphoma, multiple myeloma, and some types of anemia caused by bone marrow problems.

CC-8490 is an experimental drug being studied for brain cancer treatment. It belongs to a group called benzopyrans and is not yet approved for regular use. Patients may hear about it during clinical trials exploring new options for brain tumors. This entry helps connect the word with diagnoses, testing, treatments, supportive care, research notes, protocols, media, books, people, organizations, and safety concerns.

Cc49-Streptavidin is an experimental cancer treatment substance that combines an antibody called CC49 with streptavidin. It targets cancer cells that have a protein named TAG-72, found in some colon, prostate, breast, and ovary cancers. This helps deliver treatment directly to those cancer cells, aiming to kill them while sparing healthy tissue. It is still being studied and is not a standard therapy.

The Childhood Cancer Data Initiative (CCDI) is a program led by the National Cancer Institute to collect and share detailed information about cancer in children, teens, and young adults. Its goal is to improve diagnosis, treatment, and quality of life by connecting clinical care with research through better data collection and sharing.

CCI-779, also known as temsirolimus or Torisel, is a drug used to treat advanced kidney cancer (renal cell carcinoma). It works by blocking a protein called mTOR that helps cancer cells grow. This targeted therapy may slow or stop cancer growth and is being studied for other cancers as well.

Cclb8, also known as siltuximab or Sylvant, is a medicine used to treat a rare disease called multicentric Castleman disease in people without HIV or human herpesvirus 8. It works by blocking a protein called interleukin-6 (IL-6), which can cause inflammation and help abnormal cells grow. Researchers are also studying it for some cancers and other conditions.

CCNU, also called Gleostine or lomustine, is a chemotherapy drug used mainly to treat certain brain tumors and Hodgkin lymphoma when other treatments have not worked well. It works by damaging cancer cells’ DNA to help stop their growth. CCNU may be used alone or with other drugs and is being studied for other cancers. Like all chemotherapy, it can cause side effects, so talk with your healthcare team about what to expect.

Clear cell renal cell cancer (ccRCC) is the most common type of kidney cancer in adults. It starts in the cells lining tiny tubes in the kidney that help filter blood. Under a microscope, these cancer cells look clear or pale. Some people with inherited conditions like von Hippel-Lindau syndrome have a higher risk of developing ccRCC.

CCSG stands for Cancer Center Support Grant, a special funding given by the National Cancer Institute (NCI) to select U.S. cancer centers. This funding helps centers improve their research and patient care, aiming to develop better ways to prevent, diagnose, and treat cancer. A cancer center with a CCSG is recognized for combining strong research with quality care.

CD117, also called c-Kit or stem cell factor receptor, is a protein found on the surface of many cells. It helps certain blood cells grow by binding to a substance called stem cell factor. Some cancers, like gastrointestinal stromal tumors and melanoma, may have higher or altered CD117. Testing for CD117 helps doctors diagnose these cancers and plan treatment.

CD134, also called OX-40, is a protein found on certain immune cells called T cells. Researchers are studying treatments that attach to CD134 to help T cells grow and better fight cancer. It is part of a group of proteins known as tumor necrosis factor (TNF) receptors, which help regulate the immune system’s response to disease.

CD20 is a protein found on the surface of B cells, a type of white blood cell important for the immune system. It is often present in higher amounts in certain blood cancers like B-cell lymphomas and leukemias. Measuring CD20 helps doctors diagnose these cancers and plan treatments that may specifically target this protein.

CD20 antigen is a protein found on the surface of B cells, a type of white blood cell important for the immune system. It is often present in higher amounts in certain blood cancers like B-cell lymphomas and leukemias. Measuring CD20 helps doctors diagnose these cancers and plan treatments that may target this protein.

CD22 positive means that cancer cells have a protein called CD22 on their surface. This protein is mostly found on B cells, a type of white blood cell. Many B-cell leukemias and lymphomas show CD22, and knowing this helps doctors choose treatments that may target these cells more effectively. This entry helps connect the word with diagnoses, testing, treatments, supportive care, research notes, protocols, media, books, people, organizations, and safety concerns.

CD30 protein is found on some white blood cells called T cells and B cells. It acts as a receptor that helps control cell growth and survival. Higher levels of CD30 can appear on certain cancer cells, especially in some lymphomas. Testing for CD30 helps doctors diagnose cancer and decide on the best treatment options.

CD33 positive means that cells have a protein called CD33 on their surface. This protein helps cells communicate and grow. Some blood cancers, like acute myeloid leukemia (AML) and certain lymphomas, may have too much CD33. Knowing if cancer cells are CD33 positive can help doctors decide on treatment options, including targeted therapies.

CD34 antigen is a protein found on the surface of certain bone marrow and blood cells. It helps doctors identify early blood-forming cells, especially stem cells. This information is important in blood-related diseases and treatments like stem cell transplants. Understanding CD34 can help patients follow discussions about blood tests and bone marrow health during cancer care.

A CD4-positive T lymphocyte, also called a helper T cell, is a type of white blood cell that helps the immune system fight infections and diseases, including cancer. These cells activate other immune cells to work together in defending the body. They are important in understanding immune health and cancer treatments like immunotherapy.

CD40-Ligand is a protein that helps immune cells communicate and activate each other. It is being studied in cancer research because it may help the immune system slow or stop cancer growth. While not yet a standard treatment, CD40-Ligand is part of ongoing clinical trials exploring new ways to boost the body’s natural defenses against cancer.

CD80, also called B7-1, is a protein found on the surface of certain immune cells like B cells and monocytes. It helps activate T cells, which are important for controlling immune responses. Understanding CD80 can help explain how the immune system interacts with cancer and some treatments. It may also appear under related names such as B7-1.

The CDC, or Centers for Disease Control and Prevention, is a U.S. government agency that works to protect public health. It helps prevent and control diseases, injuries, and disabilities by tracking health trends, investigating outbreaks, and promoting healthy behaviors and safe environments nationwide. It may also appear under related names such as Centers For Disease Control, Prevention.

CDDO is a plant-based substance being studied as a possible treatment for some cancers. It may help block enzymes that cause inflammation and support cancer growth. While promising in research, CDDO is not yet a standard cancer treatment and is still considered experimental. This entry helps connect the word with diagnoses, testing, treatments, supportive care, research notes, protocols, media, books, people, organizations, and safety concerns.

CDK Inhibitor AT7519M, also called AT7519M, is an experimental drug being studied as a possible treatment for some cancers. It works by blocking enzymes called cyclin-dependent kinases (CDKs) that cancer cells need to grow and divide. This drug is not yet approved for general use but may be mentioned during discussions about clinical trials or new treatment options.

CDK Inhibitor SCH 727965, also called dinaciclib, is a drug being studied to treat advanced melanoma and other cancers. It works by blocking proteins that help cancer cells divide, which may stop their growth or cause them to die. This drug is still experimental and mainly available through clinical trials.

The CDK4 gene makes a protein that helps control how cells grow and divide. Changes in this gene can cause cells to grow too fast or without control, which may lead to cancer. Mutations in CDK4 have been found in melanoma and other cancers. This entry helps connect the word with diagnoses, testing, treatments, supportive care, research notes, protocols, media, books, people, organizations, and safety concerns.

The CDK6 gene makes a protein that helps control how cells grow and divide. Changes in this gene can cause cells to divide too quickly or without control, which may lead to abnormal growth, including cancer. Mutations in the CDK6 gene have been found in some types of cancer. This entry helps connect the word with diagnoses, testing, treatments, supportive care, research notes, protocols, media, books, people, organizations, and safety concerns.

The CDKN2A gene helps control how cells grow, divide, and die. Changes in this gene can cause cells to grow too fast or avoid normal cell death, which may lead to cancer. Mutations in CDKN2A are linked to melanoma, a serious skin cancer, and other types of cancer. This entry helps connect the word with diagnoses, testing, treatments, supportive care, research notes, protocols, media, books, people, organizations, and safety concerns.

CDS, or chlorine dioxide solution, is a liquid product related to MMS (Miracle Mineral Solution) that some people use as a cleaner or gentler alternative. It is not an approved cancer treatment and may cause serious side effects. Reports about its benefits are mixed and often unclear because it is used alongside other treatments. Health authorities warn against its use due to safety concerns.

CEA, or carcinoembryonic antigen, is a substance sometimes found in the blood of people with colon cancer, other cancers, certain diseases, or who smoke tobacco. Measuring CEA levels helps doctors monitor cancer treatment or check if cancer has returned. It is called a tumor marker but is not used alone to diagnose cancer.

A CEA assay is a blood test that measures carcinoembryonic antigen (CEA), a protein that can be higher in people with certain cancers like colon cancer, some other diseases, or smokers. Doctors use this test mainly to help monitor cancer treatment or check if cancer has returned, but it is not a test to diagnose cancer by itself.

CEA Peptide-1, also called CAP-1, is a small piece of a protein called carcinoembryonic antigen (CEA). It is found in the blood of some people with colon cancer and other conditions. Researchers use CEA Peptide-1 to develop vaccines that may help the immune system recognize and attack cancer cells. These vaccines are still experimental and not part of standard cancer treatment.

The cecum is a small pouch at the start of the large intestine, connecting the end of the small intestine to the colon. It helps move digested food waste into the colon. The cecum may be mentioned in digestive health or cancer care, especially with certain intestinal cancers or treatments.

Cedarwood is an evergreen tree known for its hard, fragrant wood and is part of the cypress family. Its oil is used in products like soaps, shampoos, perfumes, and aromatherapy. Sometimes called Eastern red cedar or red cedar (Juniperus virginiana), cedarwood oil is used in cancer care mainly for its calming scent to help with relaxation and stress relief, not as a cancer treatment.

Cediranib maleate is an experimental drug studied for treating some cancers. It works by blocking the growth of new blood vessels that tumors need to grow. This type of medicine is called an antiangiogenesis agent and targets proteins called VEGF receptors. It is also known as AZD2171 or Recentin and may be available through clinical trials.

Cefepime is a broad-spectrum antibiotic used to treat bacterial infections. In cancer care, it helps prevent or treat infections when the immune system is weakened by cancer or its treatments. It is usually given through a vein in the hospital and targets many types of bacteria, but it does not work against viruses.

Cefixime is an antibiotic medicine used to treat bacterial infections. It belongs to a group of drugs called cephalosporins. In cancer care, cefixime may be prescribed to help prevent or treat infections, especially when treatments like chemotherapy weaken the immune system. This entry helps connect the word with diagnoses, testing, treatments, supportive care, research notes, protocols, media, books, people, organizations, and safety concerns.

Ceftriaxone is an antibiotic medicine used to treat bacterial infections. It belongs to a group called cephalosporins and is often given by injection. In cancer care, it helps prevent or treat infections when the immune system is weak due to treatments like chemotherapy. Ceftriaxone only works against bacteria and does not treat viruses or cancer itself.

Celecoxib is a medicine that reduces pain and swelling. It belongs to a group called nonsteroidal anti-inflammatory drugs (NSAIDs). While mainly used to ease pain from conditions like arthritis, celecoxib is also being studied for its possible role in preventing some cancers. It is not a cancer treatment but may be part of symptom management during cancer care.

Celexa, also called citalopram, is a medication used to treat depression and sometimes anxiety. It belongs to a group of drugs called selective serotonin reuptake inhibitors (SSRIs) that help improve mood by balancing brain chemicals. In cancer care, Celexa may be prescribed to help manage emotional challenges related to diagnosis or treatment.

Celiac disease is a digestive condition where the immune system reacts to gluten, a protein found in wheat, rye, barley, and oats. This reaction damages the small intestine’s lining, making it hard for the body to absorb nutrients. People with celiac disease may become malnourished even if they eat enough food.

A cell is the smallest living unit in your body, making up all tissues and organs. Each cell has a protective outer layer, a nucleus holding genetic instructions, and fluid inside where important activities happen. Cancer begins when normal cells change and grow uncontrollably, so understanding cells helps explain how cancer starts and why treatments target these abnormal cells.

Cell culture is a laboratory method where cells from humans, animals, plants, or microbes are grown in controlled conditions. This helps doctors and researchers study diseases, test new treatments, and understand how cancer cells behave. While important in cancer research and some tests, cell culture itself is a tool and not a diagnosis or treatment.

The cell cycle is the natural process cells follow to grow and divide into two new cells. It involves copying chromosomes and cell parts before splitting. This process is essential for growth, healing, and replacing old cells. In cancer, the cell cycle is important because cancer cells divide uncontrollably, and some treatments work by targeting cells during specific parts of this cycle.

A cell cycle inhibitor is a substance that blocks the natural process cells use to grow and divide. Some of these inhibitors are used or studied as cancer treatments to slow or stop cancer cells from multiplying. By interfering with cell division, they can help control tumor growth, though not all are approved treatments yet.

Cell differentiation is the natural process where young, unspecialized cells develop into mature cells with specific roles in the body. In cancer care, doctors look at how much cancer cells resemble normal cells to help understand the cancer’s behavior and guide treatment. This process helps explain how tissues grow and why some cancer cells may act differently.

Cell division is the natural process where one cell splits to form two new cells, called daughter cells. This process helps the body grow, heal, and replace old cells. In cancer, cell division can happen uncontrollably, which leads to tumor growth. Understanding cell division helps explain how cancer develops and how some treatments work by targeting dividing cells.

Cell motility is a cell’s natural ability to move from one place to another. In cancer, this movement can affect how cancer cells spread to other parts of the body. Understanding cell motility helps doctors learn about cancer behavior and may influence treatment decisions. It is one factor among many that doctors consider when evaluating cancer.

Cell proliferation is the process where cells grow and divide to make more cells. It’s a normal part of healing and growth in the body. In cancer, cell proliferation can happen faster or without control, which helps cancer grow and spread. Understanding cell proliferation can help you follow discussions about how cancer behaves and how treatments work to slow or stop cell growth.

Cell respiration, also called aerobic metabolism or oxidative metabolism, is the process where cells use oxygen to turn sugars into energy. This energy fuels all cell activities, including growth and repair. In cancer care, understanding cell respiration is important because cancer cells may use energy differently than normal cells, which can affect how tumors grow and respond to treatment.

Cell signaling is how cells send and receive messages to control their actions, like growing or dying. Chemical signals such as hormones attach to special proteins on or inside cells to trigger these responses. Proper cell signaling keeps cells healthy, but changes in this process can sometimes lead to cancer by causing cells to grow uncontrollably or avoid death.

Cell type refers to the specific kind of cells found in normal or cancer tissue, identified by looking at them under a microscope. Examples include lymphocytes (immune cells), melanocytes (skin pigment cells), and squamous cells (flat cells lining organs). Knowing the cell type helps doctors diagnose cancer, choose treatments, and understand how the disease might behave.

Cell-cell signaling is how cells send and receive messages to each other, either by touching directly or by releasing substances that nearby cells detect. This communication helps cells grow and work properly. When cell signaling breaks down, it can lead to abnormal cell growth, which may contribute to cancer. It may also appear under related names such as Cell-To-Cell Signaling, Intercellular Communication.

Cell-cycle regulation is the natural process that controls how cells grow, copy their DNA, and divide. When this process works properly, cells divide in a controlled way. If it doesn’t, cells may divide too quickly or uncontrollably, which can lead to diseases like cancer. This entry helps connect the word with diagnoses, testing, treatments, supportive care, research notes, protocols, media, books, people, organizations, and safety concerns.

Cell-to-cell signaling is how cells in the body send and receive messages to each other. This communication happens either through direct contact or by releasing substances that other cells detect. It helps cells grow, divide, and work properly. When this signaling breaks down, cells may grow abnormally, which can lead to cancer.

Cellcept, also called mycophenolate mofetil, is a medicine that helps prevent graft-versus-host disease (GVHD) after organ transplants by calming the immune system. It is also being studied for use after stem cell transplants in cancer care and for some autoimmune diseases. Because it lowers immune activity, patients taking Cellcept need careful monitoring for infections.

Cellular adhesion is the natural process where cells stick closely to each other, helping tissues stay connected and work properly. In cancer, changes in how cells stick together can affect how tumors grow or spread. Understanding cellular adhesion can help explain some behaviors of cancer cells during diagnosis and treatment.

Cellular adoptive immunotherapy is a cancer treatment that uses a patient’s own immune cells, called T cells, to fight cancer. These cells are collected, grown in a lab, and sometimes changed to better target cancer before being given back to the patient. This therapy helps boost the body’s natural defenses against cancer.

Cellular Healing Diets are nutrition plans linked to cancer care that aim to support the body’s metabolism, reduce inflammation, improve digestion, and strengthen the immune system. These diets may be mentioned as part of treatment support or alternative approaches, but their safety and effectiveness should be carefully discussed with your healthcare team before use.

Cellular metabolism is the set of chemical processes inside cells that provide energy and materials needed for life. These processes help cells build new molecules and break down others to keep the cell working properly. In cancer, cells often change how they use energy and nutrients, which can affect tumor growth and treatment.

Cellular Nutrition Protocol is a diet or nutrition plan sometimes discussed in cancer care to support nutrition, metabolism, inflammation, digestion, immune health, and treatment tolerance. It may be offered as part of supportive care or alternative approaches. Because its safety and effectiveness are not well established, patients should discuss it carefully with their healthcare team before use.

Cellulitis is a sudden skin infection that affects deeper layers of the skin and tissues beneath. It causes redness, warmth, swelling, and tenderness, sometimes with fever or swollen lymph nodes. It often starts after a skin injury and needs quick treatment with antibiotics to prevent serious problems, especially in people receiving cancer treatments that weaken the immune system.

Cellulose is a natural fiber found in plants that people cannot digest. It adds bulk to the diet and helps keep bowel movements regular. In cancer care, understanding cellulose is helpful when managing nutrition and digestion during treatment and recovery. This entry helps connect the word with diagnoses, testing, treatments, supportive care, research notes, protocols, media, books, people, organizations, and safety concerns.

CEM is a chemotherapy treatment combining three drugs—carboplatin, etoposide, and melphalan—mainly used to treat high-risk neuroblastoma. It is often given before a stem cell transplant to prepare the body. This combination attacks cancer cells in different ways to improve treatment effectiveness. It may also appear under related names such as CEM Regimen.

The CEM Regimen is a chemotherapy treatment combining three drugs—carboplatin, etoposide, and melphalan—mainly used to treat high-risk neuroblastoma. It is often given before a stem cell transplant to prepare the body. This combination attacks cancer cells in different ways to improve treatment effectiveness. It may also appear under related names such as CEM.

Cemiplimab, also known by the brand name Libtayo, is a medicine that helps the immune system fight certain advanced skin cancers and some lung cancers. It works by blocking a protein called PD-1, which cancer cells use to hide from immune cells. Cemiplimab is often used when other treatments are not suitable or have stopped working.

The Centers for Disease Control and Prevention (CDC) is a U.S. government agency that works to protect public health by preventing and controlling diseases, injuries, and disabilities. It tracks health trends, investigates outbreaks, promotes healthy behaviors, and supports safe environments across the country and worldwide. It may also appear under related names such as CDC.

A centimeter (cm) is a unit of length in the metric system, equal to one hundredth of a meter or about 0.4 inches. In medicine, centimeters are commonly used to measure the size of tumors, growths, or body parts. Understanding centimeters helps patients better understand their diagnosis, treatment options, and test results when size matters.

The Central Nervous System (CNS) includes the brain and spinal cord. It controls many important body functions like movement, sensation, and thinking. In cancer care, the CNS is important because some cancers can spread there or need special treatments to protect it. It may also appear under related names such as CNS.

Central nervous system depressants (CNS depressants) are medicines that slow down brain activity to help relax muscles and calm the mind. They are often used to treat trouble sleeping, anxiety, panic attacks, and seizures. Some may also be given before surgery to reduce anxiety. Common types include benzodiazepines, barbiturates, and certain sleep aids. These drugs can cause drowsiness and should be used only as directed by a healthcare provider.

Central Nervous System Metastasis, or CNS metastasis, happens when cancer spreads from its original site to the brain or spinal cord. This means cancer cells have traveled to the central nervous system, which controls many vital functions. Knowing this term can help patients and caregivers understand its role in diagnosis and treatment planning.

Central Nervous System Primitive Neuroectodermal Tumor (CNS PNET) is a rare cancer that starts in early nerve cells in the brain or spinal cord. It affects important parts of the central nervous system and usually requires specialized care. Knowing this term can help patients and caregivers understand diagnosis and treatment discussions.

Central Nervous System Prophylaxis (CNS Prophylaxis) is a treatment given to prevent cancer cells from spreading to the brain and spinal cord. It often involves chemotherapy injected directly into the fluid around the brain and spinal cord or high-dose chemotherapy through a vein. Sometimes radiation therapy is also used. This treatment helps lower the chance of cancer returning in the central nervous system, especially in certain leukemias and lymphomas.

Central nervous system stimulants (CNS stimulants) are medicines that increase certain brain chemicals to help improve alertness, attention, energy, and physical activity. They can also raise blood pressure, heart rate, and breathing. These drugs are often used to treat conditions like depression, ADHD, and narcolepsy. In cancer care, they may sometimes be used to help manage fatigue or mood changes, depending on individual needs and medical advice.

A Central Nervous System (CNS) tumor is an abnormal growth of cells in the brain or spinal cord. These tumors include types like brain stem glioma, craniopharyngioma, medulloblastoma, and meningioma. CNS tumors can affect important brain and nerve functions and may require specialized care and treatment. It may also appear under related names such as CNS Tumor.

A central venous access catheter is a thin, flexible tube placed into a large vein near the heart, usually under the collarbone. It helps deliver treatments like chemotherapy, fluids, or blood transfusions and allows blood to be drawn easily. This device can stay in place for weeks or months, reducing the need for repeated needle sticks during cancer care.

CEP-2563 Dihydrochloride is an experimental drug studied for treating some cancers. It works by blocking proteins called receptor tyrosine kinases that help tumors grow. This targeted approach aims to stop cancer cells from multiplying and may cause them to die. It is not yet a standard treatment and is mainly available through clinical trials.

CEP-701, also called lestaurtinib, is an experimental drug studied mainly for acute leukemias and some other cancers. It works by blocking a protein on certain cancer cells that helps them grow and divide. CEP-701 belongs to a group of medicines called receptor tyrosine kinase inhibitors, which interfere with signals cancer cells need to multiply. It is usually available only in clinical trials and is not yet a standard treatment.

Cephalexin is an antibiotic medicine used to treat bacterial infections. It belongs to a group of drugs called cephalosporins. In cancer care, it may be prescribed to help prevent or treat infections, especially when the immune system is weakened by treatments like chemotherapy. This entry helps connect the word with diagnoses, testing, treatments, supportive care, research notes, protocols, media, books, people, organizations, and safety concerns.

Cephalosporin is a type of antibiotic medicine used to treat bacterial infections. During cancer care, it may be prescribed to prevent or treat infections, especially when treatments like chemotherapy weaken the immune system. Understanding cephalosporins helps patients recognize why antibiotics are part of their care plan and how they support overall health during treatment.

Ceramide is a natural fat-like molecule found in the outer layers of cells and nerve coverings. It helps cells respond to their environment and can sometimes trigger controlled cell death. Researchers are studying ceramide to better understand its role in cancer and to explore new treatment possibilities. This entry helps connect the word with diagnoses, testing, treatments, supportive care, research notes, protocols, media, books, people, organizations, and safety concerns.

Cerclage is a procedure during pregnancy where a special stitch or band is placed around the cervix to help keep it closed. It is used to reduce the risk of miscarriage or premature birth when the cervix is weak or shorter than usual. If the cervix has been removed, the stitch may be placed on the lower part of the uterus instead.

A cerebellar hemangioblastoma is a noncancerous, slow-growing tumor made up of abnormal blood vessels in the cerebellum, the part of the brain that controls balance and coordination. Though benign, it can cause symptoms by pressing on nearby brain tissue. People with von Hippel-Lindau disease have a higher risk of developing these tumors.

Cerebellar Mutism Syndrome (CMS) is a condition that can happen after surgery to remove a brain tumor, especially in the cerebellum. It usually starts 1 or 2 days after surgery and causes symptoms like loss of speech, trouble swallowing, balance problems, difficulty walking, muscle weakness, mood changes, and personality shifts. Many symptoms improve over time.

Cerebellopontine refers to the area of the brain where the cerebellum and the pons meet. This region, called the cerebellopontine angle, is important because certain tumors, like acoustic neuromas, often develop here. Understanding this term can help patients and caregivers follow discussions about brain imaging, diagnosis, or treatment related to this part of the brain.

The cerebellum is a small part of the brain located at the back of the head. It helps control balance, coordination, and smooth movements like walking or playing sports. Problems in this area can affect movement and are sometimes linked to brain tumors or other conditions. This entry helps connect the word with diagnoses, testing, treatments, supportive care, research notes, protocols, media, books, people, organizations, and safety concerns.

Cerebral edema is swelling in the brain caused by fluid buildup. This swelling raises pressure inside the skull, which can reduce blood flow and oxygen to the brain. Symptoms may include headache, dizziness, nausea, vision changes, and difficulty speaking or moving. It can happen due to brain injuries, stroke, infections, tumors, or high altitudes. In cancer care, brain tumors or treatments may cause cerebral edema, so doctors watch for symptoms closely to manage it promptly.

The cerebral hemisphere is one half of the cerebrum, the largest part of the brain. It controls muscle movements and important functions like speech, thinking, emotions, reading, writing, and learning. The right hemisphere controls muscles on the left side of the body, while the left hemisphere controls muscles on the right side.

Cerebrospinal fluid (CSF) is a clear liquid that flows around and inside the brain and spinal cord. It cushions and protects these important parts of the nervous system. CSF is made by special tissue in the brain’s hollow spaces called ventricles. Doctors may test CSF to check for infections, inflammation, or cancer cells that have spread to the brain or spinal cord.

Cerebrospinal fluid diversion is a procedure that uses a thin tube called a shunt to drain extra fluid from around the brain or spinal cord. This helps lower pressure caused by fluid buildup, which can happen with some cancers or their treatments. The shunt moves the fluid to another part of the body where it can be safely absorbed.

A cerebrospinal fluid (CSF) shunt is a thin, flexible tube placed in the brain or spinal cord to drain extra fluid that has built up. It helps reduce pressure by moving this fluid to another part of the body, such as the abdomen or chest, where it can be absorbed. This device is used when fluid buildup causes swelling or pressure on the brain or spinal cord.

A cerebrovascular accident (CVA), also called a stroke, happens when blood flow to part of the brain is blocked or a blood vessel breaks. This causes damage to brain tissue and can lead to sudden symptoms like dizziness, weakness or numbness on one side of the body, and trouble speaking or understanding language. It is a medical emergency that needs quick treatment to reduce brain damage.

The cerebrum is the largest part of the brain, split into two halves called cerebral hemispheres. It controls important functions like muscle movement, speech, thinking, emotions, reading, writing, and learning. Understanding the cerebrum can help patients and caregivers better grasp brain-related health issues, including those connected to cancer. This entry helps connect the word with diagnoses, testing, treatments, supportive care, research notes, protocols, media, books, people, organizations, and safety concerns.

A ceremony is a set of actions or rituals performed to mark a special event or important moment. In cancer care, ceremonies may help patients and families recognize milestones, cope with changes, or celebrate progress. These events can be simple or formal and often provide emotional support during difficult times.

Ceritinib (brand name Zykadia) is a pill used to treat adults with a type of lung cancer called non-small cell lung cancer (NSCLC) that has spread and tests positive for changes in the ALK gene. It works by blocking proteins made by the ALK gene, which may help stop cancer cells from growing and spreading. Ceritinib belongs to a group of drugs called tyrosine kinase inhibitors.

Cervarix is a vaccine that protects females aged 9 to 25 from infection with two high-risk types of human papillomavirus (HPV), types 16 and 18, which are linked to most cervical cancers. While it is no longer available in the United States, Cervarix is still used in other countries to help prevent cervical cancer and related precancerous changes.

Cervical refers to the lower, narrow end of the uterus called the cervix, which connects the uterus to the vagina. In cancer care, cervical most often relates to cervical cancer, a disease that starts in the cells of this area. Understanding this term helps you follow discussions about screening, diagnosis, and treatment of cervical cancer.

Cervical adenocarcinoma is a type of cervical cancer that starts in the glandular cells lining the inner part of the cervix. These cells produce mucus and are different from the more common flat squamous cells. This cancer is less common than cervical squamous cell carcinoma and may require specific tests and treatments.

Cervical cancer is a slow-growing cancer that starts in the cervix, the lower part of the uterus connecting to the vagina. It often has no early symptoms and is usually found through regular Pap tests, which check cervical cells for changes. Most cervical cancers are caused by long-lasting infection with human papillomavirus (HPV). Early detection through screening can help prevent or treat cervical cancer effectively.

Cervical dysplasia means there are abnormal cells on the surface of the cervix, often caused by certain types of human papillomavirus (HPV). It is found through a Pap test or cervical biopsy and can range from mild to severe. While not cancer, cervical dysplasia can sometimes develop into cancer if untreated.

Cervical Intraepithelial Neoplasia (CIN) means abnormal cells found on the cervix’s surface during a biopsy. It is usually caused by certain types of human papillomavirus (HPV). CIN is not cancer but can sometimes develop into cancer if untreated. It is graded from 1 to 3 based on how abnormal the cells look and how much tissue is affected.

Cervical squamous cell carcinoma is the most common type of cervical cancer. It starts in the thin, flat squamous cells that line the outer part of the cervix, the lower part of the uterus that opens into the vagina. This cancer often shows up in screening tests like Pap smears and knowing this type helps guide treatment decisions.

Cervical Squamous Intraepithelial Neoplasia 1 (CIN 1) means mild abnormal changes in the cells on the surface of the cervix, usually caused by certain types of human papillomavirus (HPV). It is not cancer and often goes away without treatment, but it can sometimes progress to more serious changes if not monitored carefully.

Cervical Squamous Intraepithelial Neoplasia 2 (CIN 2) means moderately abnormal cells were found on the cervix’s surface, usually caused by certain types of human papillomavirus (HPV). CIN 2 is not cancer but can develop into cancer if untreated. Treatment often involves removing or destroying these abnormal cells to protect cervical health.

Cervical Squamous Intraepithelial Neoplasia 2/3 (CIN 2/3) is a biopsy result showing moderately to severely abnormal cells on the cervix surface. Caused by certain high-risk human papillomavirus (HPV) infections, CIN 2/3 is not cancer but can develop into cancer if untreated. Treatment usually involves removing or destroying these abnormal cells to prevent progression.

Cervical Squamous Intraepithelial Neoplasia 3 (CIN 3) means severely abnormal cells were found on the cervix surface during a biopsy. Caused by certain types of human papillomavirus (HPV), CIN 3 is not cancer but is a serious precancerous condition. Treatment aims to remove or destroy these abnormal cells to prevent cervical cancer from developing.

Cervicectomy, also called trachelectomy, is surgery to remove the cervix, the lower part of the uterus. There are two types: simple cervicectomy removes only the cervix, while radical cervicectomy removes the cervix plus nearby tissue and the upper part of the vagina. This surgery may be an option for early-stage cervical cancer patients who want to preserve fertility, since the uterus and ovaries remain intact.

CerviPrep is a medical device that fits over the cervix, the lower part of the uterus, to deliver medication directly and safely. It protects nearby tissue while allowing doctors to inject drugs into the cervix through an attached syringe. This targeted approach helps treat cervical conditions with less impact on surrounding areas.

The cervix is the lower, narrow part of the uterus that connects to the vagina. It allows menstrual blood to flow out and widens during childbirth. The cervix has two main parts: the outer ectocervix and the inner endocervix. It plays an important role in women’s reproductive health and is the site where most cervical cancers begin.

Cesamet, also called nabilone, is a man-made pill that contains a chemical like THC, the active part of marijuana. It is used to help control nausea and vomiting caused by chemotherapy when other medicines have not worked. Cesamet belongs to a group of drugs called cannabinoids and is taken under medical supervision.

A cesarean delivery, also called a C-section, is surgery to deliver a baby through cuts made in the abdomen and uterus. It is done when vaginal birth is unsafe or not possible. After the baby is born, the umbilical cord is cut, the placenta is removed, and the incisions are closed with stitches. Recovery usually takes longer than after vaginal birth.

A cesarean section, also called a C-section or cesarean delivery, is surgery to deliver a baby through cuts made in the abdomen and uterus. It is done when vaginal birth isn’t safe or possible. After the baby is born, the umbilical cord is cut, the placenta is removed, and the incisions are closed with stitches. Recovery usually takes longer than after vaginal birth.

Cesium Chloride, also called High pH Therapy, is an alternative treatment some people use for advanced cancer. It involves taking cesium chloride orally to change the body’s pH. However, there is no strong scientific evidence that it works, and it can cause serious heart problems, including dangerous irregular heartbeats. Patients should always discuss its use with their healthcare team to understand the risks and benefits.

Cesium chloride, also called high-pH therapy, is a supplement some people use to try to make cancer cells less acidic. However, there is no reliable evidence that it helps treat cancer. The U.S. Food and Drug Administration (FDA) warns against using cesium salts because they can cause serious heart problems, seizures, and even death. Patients should always talk with their cancer care team before considering this or any alternative therapy.

Cetuximab (brand name Erbitux) is a targeted cancer medicine used to treat certain head and neck and colorectal cancers. It works by attaching to a protein called EGFR on some cancer cells, which may help slow or stop their growth. Cetuximab can be given alone or with other treatments like chemotherapy or radiation.

CEV is a chemotherapy treatment combining three drugs—carboplatin, etoposide, and vincristine—mainly used to treat retinoblastoma, a rare eye cancer in children. This combination attacks cancer cells in different ways to improve treatment success and help prevent the cancer from spreading beyond the eye. It may also appear under related names such as CEV Regimen.

The CEV Regimen is a chemotherapy treatment that combines three drugs—carboplatin, etoposide, and vincristine—to treat retinoblastoma, a rare eye cancer in children. This combination attacks cancer cells in different ways to help control the disease and reduce the chance it spreads beyond the eye. It may also appear under related names such as CEV.

Cevimeline hydrochloride, also called Evoxac, is a medication that helps increase saliva and sweat production. It is used to treat problems with the salivary glands that cause dry mouth. It is also being studied to help relieve dry mouth caused by radiation therapy to the head and neck, a common side effect in cancer care.

CFC syndrome, or cardiofaciocutaneous syndrome, is a rare genetic condition that affects the heart, face, and skin. People with CFC often have delays in growth and learning, distinctive facial features, heart defects, and skin problems like dry or curly hair. It is caused by changes in certain genes that affect how cells grow and communicate.

Chronic Fatigue Syndrome (CFS) is a condition lasting more than six months where a person feels very tired most of the time. This tiredness doesn’t improve with rest and can make daily activities hard to do. Other symptoms may include trouble concentrating, sore throat, fever, muscle weakness, headaches, and joint pain.

Chromogranin A (CgA) is a protein made by neuroendocrine cells that release hormones into the blood. Higher levels of CgA can be found in people with certain neuroendocrine tumors, small cell lung cancer, prostate cancer, and other conditions. Measuring CgA in the blood helps doctors diagnose cancer, monitor treatment, or check if cancer has returned.

CGP 48664 is an experimental drug being studied for cancer treatment. It works by blocking an enzyme involved in cell growth, which may help slow or stop cancer cells from growing. It is not yet approved for regular use and is mainly available through clinical trials. This entry helps connect the word with diagnoses, testing, treatments, supportive care, research notes, protocols, media, books, people, organizations, and safety concerns.

Ch14.18, also called dinutuximab, is a medicine used to treat children with high-risk neuroblastoma, a cancer that starts in certain nerve cells. It works by attaching to a substance called GD2 on cancer cells, helping the immune system attack them. Ch14.18 is given after initial treatments have reduced the cancer and is used together with other medicines to improve results.

The Chamberlain procedure, also called anterior mediastinotomy, is a surgical method where a small tube is inserted through a cut next to the breastbone on the left side of the chest. It helps doctors take a tissue sample from lymph nodes between the lungs to diagnose or stage cancers and other conditions.

Chamomile is a group of plants with small, daisy-like flowers, including German and Roman chamomile. People often use chamomile in teas to help relax, improve sleep, and soothe mild stomach problems. Its essential oil is also found in products like perfumes, lotions, and aromatherapy items. Chamomile is not a cancer treatment but may be used to help manage symptoms during cancer care.

Chantix, also called varenicline tartrate, is a medication that helps people stop smoking by easing cravings and withdrawal symptoms. It works on the brain’s nicotine receptors to reduce the urge to smoke. Quitting tobacco is important for cancer prevention and overall health. Chantix is often used alongside counseling and support to help people quit successfully.

Chaparral (Larrea tridentata) is a plant sometimes used in herbal supplements. Though often seen as natural and safe, chaparral has been linked to serious liver injury. Patients undergoing cancer treatment should be cautious about using chaparral and always discuss any herbal supplements with their healthcare team to avoid risks and interactions.

Chaparral (Larrea tridentata) is an herb sometimes promoted for cancer treatment and detoxification. However, it has been linked to serious liver damage and other health risks. There is no reliable evidence that chaparral helps treat cancer, and it should be avoided unless a healthcare provider specifically approves its use. It may also appear under related names such as Chaparral, Larrea tridentata.

A chaplain is a clergy member who provides spiritual and emotional support in places like hospitals or military settings. In cancer care, chaplains help patients and families cope with the emotional and spiritual challenges that come with diagnosis, treatment, and recovery. Their support is confidential and available to people of all faiths or none.

Charged-particle radiation therapy is a type of external radiation treatment that uses high-energy particles like protons or helium ions to target and kill cancer cells. It aims to reduce damage to nearby healthy tissues compared to traditional X-ray radiation. A special machine directs these invisible particles precisely to the tumor during treatment.

Chaste tree berry, also called monk’s pepper or Vitex, is an herbal extract from the fruit of the chaste tree found in parts of Asia and Europe. It is often used to help with infertility and to ease menstrual symptoms like headaches and irregular bleeding. Because it may affect reproductive hormone levels, it’s important to tell your healthcare team if you use it, especially during cancer care.

The cheekbone, also called the zygomatic bone, is one of two bones on the upper sides of the face. It shapes the cheeks and part of the eye socket, connects to nearby bones like the jaw and forehead, and supports muscles that help move the jaw. It also protects important nerves and blood vessels in the face.

A chelating agent is a chemical that binds tightly to metal ions in the body. In medicine, these agents help remove harmful metals like lead or mercury. In cancer care, they may be used to manage metal exposure or are being studied for possible roles in treatment. Understanding this term can help patients and caregivers recognize when chelating agents are part of therapies or tests.

Ukrain, also called Chelidonium Alkaloid Thiophosphate, is a drug made from the greater celandine plant. It has been studied for its possible ability to help treat cancer by causing cancer cells to die. While some early research shows promise, the studies so far have been small and of limited quality. More reliable research is needed to understand its safety and effectiveness. Always talk with your healthcare team before considering Ukrain.

Chemabrasion, also called chemexfoliation or a chemical peel, is a skin treatment that uses a chemical solution to gently remove the top layers of skin. It helps improve the look of skin problems like acne scars, wrinkles, and sun damage by encouraging new, smoother skin to grow. While it is a cosmetic procedure, it may be used in cancer care to help manage skin changes caused by treatment or sun exposure.

Chemexfoliation, also called chemabrasion or a chemical peel, is a skin treatment that uses a chemical solution to gently remove the top layers of skin. It helps improve the look of skin problems like acne scars, wrinkles, or sun damage by encouraging new, healthier skin to grow. While mainly cosmetic, it may be used in cancer care to manage skin changes caused by treatment or sun exposure.

A chemical is any substance made from elements like hydrogen or sodium. In cancer care, chemicals include medicines used to treat cancer, as well as substances in the environment that might affect health. The meaning of 'chemical' depends on the situation, such as treatment, diagnosis, or safety concerns. Not all chemicals are harmful; some are essential for life and health.

A chemical imbalance means having too much or too little of certain substances in the body that help it work properly. In cancer care, some tumors can cause chemical imbalances that affect mood or behavior. Understanding this term can help patients and caregivers recognize changes and discuss them with their care team.

A chemical peel, also called chemabrasion or chemexfoliation, is a skin treatment that uses a special chemical solution to gently remove the top layers of skin. It helps improve the look of skin problems like acne scars, wrinkles, and sun damage by encouraging new, smoother skin to grow. While mainly cosmetic, it may also be used to help manage skin changes caused by cancer treatments.

Chemo brain is a term used to describe thinking and memory problems that people with cancer may experience before, during, or after treatment. These problems can include confusion, trouble concentrating, memory loss, and difficulty making decisions. Chemo brain may be caused by cancer itself, treatments like chemotherapy, or related health issues such as fatigue or stress.

Chemoembolization, also called TACE, is a treatment that delivers chemotherapy drugs directly into the blood vessels feeding a tumor, usually in the liver. Tiny beads carrying the drugs block blood flow to the tumor while slowly releasing medicine. This targeted approach helps attack the tumor while reducing side effects to the rest of the body.

Chemoimmunotherapy is a cancer treatment that combines chemotherapy drugs, which kill or slow cancer cells, with immunotherapy, which helps the immune system fight cancer. Using both together may improve how well the treatment works by attacking cancer in different ways. The exact approach varies depending on the type of cancer and the patient’s situation.

Chemokines are proteins made by immune and other cells that act like signals to guide white blood cells to areas needing defense or repair. They help the immune system respond to infections, inflammation, and other health challenges. In cancer care, chemokines influence how immune cells move around tumors and may affect treatment approaches.

Chemoprevention means using medicines or other substances to lower the chance of developing cancer or to help keep cancer from coming back. It is often considered for people at higher risk of certain cancers. For example, drugs like tamoxifen and raloxifene may be used to reduce the risk of some breast cancers in women at increased risk.

A chemoprevention study, also called an agent study, is a clinical trial that tests whether certain medicines, vitamins, minerals, or supplements can help prevent cancer. These studies explore ways to lower the chance of developing cancer by using agents that might stop cancer from starting or growing. It may also appear under related names such as Agent Study.

A chemoprotective agent is a medicine given during chemotherapy to help protect healthy organs from side effects caused by certain cancer drugs. Examples include amifostine for kidney protection, mesna for bladder protection, and dexrazoxane (Zinecard) to reduce heart damage. These medicines do not treat cancer but help make chemotherapy safer and easier to tolerate.

Chemoradiation, also called chemoradiotherapy, is a cancer treatment that combines chemotherapy drugs with radiation therapy. This approach uses medicines and targeted radiation together to help control or shrink tumors. It may be recommended for certain cancers to improve treatment effectiveness by attacking cancer cells in different ways at the same time or in a planned sequence.

Chemoradiotherapy, also called chemoradiation, is a cancer treatment that combines chemotherapy drugs with radiation therapy. This approach uses medicines and targeted radiation together to help control or shrink tumors. It may be recommended for certain cancers to improve treatment effectiveness by attacking cancer cells in different ways at the same time or in a planned sequence.

Chemoreduction is chemotherapy given to shrink a retinoblastoma tumor before surgery or radiation. This helps make later treatments more effective and may reduce side effects by decreasing the tumor size first. It is an important step in treating this rare eye cancer in children. This entry helps connect the word with diagnoses, testing, treatments, supportive care, research notes, protocols, media, books, people, organizations, and safety concerns.

Chemosensitivity describes how well cancer cells respond to chemotherapy drugs. It means how effectively these drugs can kill or stop the growth of tumor cells. Knowing a tumor’s chemosensitivity helps doctors choose the best chemotherapy treatment and predict how the cancer might respond to certain medicines. This entry helps connect the word with diagnoses, testing, treatments, supportive care, research notes, protocols, media, books, people, organizations, and safety concerns.

A chemosensitivity assay is a lab test that checks how well cancer cells respond to chemotherapy drugs. After tumor cells are taken from the body, they are tested in the lab with different drugs to see which ones kill the most cancer cells. This test may help doctors choose the most effective chemotherapy treatment for a patient’s cancer, but it is not a perfect predictor of how the cancer will respond inside the body.

Chemosensitivity testing is a lab method that checks how cancer cells respond to different chemotherapy drugs outside the body. It helps doctors identify which treatments might work best for a patient’s tumor, aiming to avoid ineffective drugs and reduce side effects. This testing is not used for all cancers and is one of many tools doctors consider when planning treatment.

A chemosensitizer is a medicine that helps cancer cells respond better to chemotherapy. It works alongside chemotherapy drugs to make them more effective against tumor cells. Chemosensitizers do not replace chemotherapy but may improve treatment results by overcoming resistance in cancer cells. Their use and effects vary depending on the cancer type and individual treatment plans.

A chemotherapeutic agent is a medicine used to treat cancer by killing cancer cells or slowing their growth. These drugs are often given by mouth, injection, or infusion and may be used alone or with other treatments like surgery or radiation. The exact drug and how it’s used depend on the type of cancer and the patient’s health.

Chemotherapy is a cancer treatment that uses medicines to kill cancer cells or stop them from growing. It can be given by mouth, injection, infusion, or applied to the skin. Chemotherapy may help cure cancer, slow its growth, or relieve symptoms caused by tumors, but it can also cause side effects like fatigue and nausea.

The chest wall is the group of skin, fat, muscles, bones, and other tissues that protect important organs like the heart and lungs. It includes the ribs, breastbone (sternum), and spine. The chest wall also helps with breathing and movement of the upper arms and shoulders. In cancer care, it may be involved when tumors are near or affect these tissues.

A chest x-ray is a quick, painless test that uses a small amount of radiation to create pictures of the heart, lungs, and other structures inside your chest. It helps doctors find infections, injuries, or diseases affecting the chest area, including some changes related to cancer. This entry helps connect the word with diagnoses, testing, treatments, supportive care, research notes, protocols, media, books, people, organizations, and safety concerns.

Chewing tobacco, also called spit tobacco, is a smokeless tobacco product made from cured tobacco leaves. It is placed between the cheek and lower lip and may be chewed or held in place. It contains nicotine and harmful chemicals that can cause addiction and increase the risk of cancers in the mouth, throat, esophagus, and pancreas, as well as other health problems.

CHF, or chronic heart failure, is a long-term condition where the heart cannot pump blood effectively. It often develops slowly and causes symptoms like shortness of breath, tiredness, trouble exercising, and swelling in the feet, ankles, or belly. It mainly affects older adults and can be linked to heart disease, heart attacks, or high blood pressure.

Chiasma is a medical term for an X-shaped crossing where two body structures, like nerves or tendons, intersect. In cancer care, understanding chiasma helps explain how tumors or treatments relate to nearby crossing tissues. It describes a normal part of anatomy and does not mean there is damage or disease by itself.

Chickenpox, also called varicella, is a highly contagious infection caused by the varicella-zoster virus. It usually begins with an itchy rash of fluid-filled blisters that spread over the body, often starting on the face, chest, and back. Other symptoms can include fever, headache, tiredness, and loss of appetite. Most people recover in about a week, but it can be more serious for infants, adults, pregnant women, and those with weakened immune systems.

A Child-Life Specialist is a trained health care professional who supports the emotional and developmental needs of children facing medical challenges like cancer. They help children and families understand medical procedures in ways that reduce fear and provide emotional comfort during treatment. Also called a Child-Life Worker, they play an important role in helping young patients cope with their experiences.

A Child-Life Worker, also called a Child-Life Specialist, is a trained health care professional who supports the emotional and developmental needs of children facing medical challenges like cancer. They help children and families understand medical procedures in ways that reduce fear and provide comfort during treatment. It may also appear under related names such as Child-Life Specialist.

The Childhood Acute Lymphoblastic Leukemia Risk Group System helps doctors sort children with ALL into groups based on factors like age and white blood cell count. These groups—standard (low) risk or high risk—guide treatment choices and help predict how the leukemia might respond to therapy. This entry helps connect the word with diagnoses, testing, treatments, supportive care, research notes, protocols, media, books, people, organizations, and safety concerns.

Childhood cancer, also called pediatric cancer, includes cancers that develop in children from birth up to 14 years old. These cancers are rare and often behave differently from adult cancers. Common types include leukemia, brain and spinal cord tumors, lymphoma, and neuroblastoma. Treatment requires specialized care tailored to children’s unique needs.

The Childhood Cancer Data Initiative (CCDI) is a program led by the National Cancer Institute to collect and share detailed information about cancer in children, teens, and young adults. Its goal is to improve diagnosis, treatment, and quality of life by connecting clinical care with research through better data collection and sharing.

A childhood cancer risk group is a way doctors classify children with cancer based on factors like age, cancer stage, and biology. These groups help predict how likely the cancer is to be cured or to come back. Knowing the risk group helps guide treatment choices and follow-up care, often labeled as low, intermediate, or high risk.

The Children’s Oncology Group (COG) is a large network of hospitals and researchers supported by the National Cancer Institute. It focuses on studying childhood cancers through clinical trials that explore new ways to prevent, diagnose, and treat cancer in children and teens. COG also studies supportive care and survivorship to improve quality of life during and after treatment.

Chimeric means having cells from different genetic origins within the same person, organ, or tissue. This can happen naturally during early development or after medical procedures like organ or bone marrow transplants. In cancer care, understanding chimeric cells helps doctors monitor transplant success and guide treatment. The term also appears in lab research when combining genes from different species to develop new therapies.

A chimeric antigen receptor (CAR) is a specially made protein added to a patient’s immune cells to help them find and attack cancer cells. These modified immune cells, called CAR T cells, are grown in the lab and then given back to the patient to help fight certain cancers, mainly some blood cancers like leukemia and lymphoma.

Chimeric Antigen Receptor T-Cell Therapy, or CAR T-cell therapy, is a treatment that changes a patient’s own immune cells in a lab to better find and attack cancer cells. The patient’s T cells are collected, modified to recognize cancer, grown in large numbers, and then given back through an infusion. It is mainly used for certain blood cancers and is being studied for others.

Chimerism is a condition where a person’s body has cells with two or more different sets of DNA. This can happen naturally during pregnancy or twin development, or after medical procedures like stem cell or organ transplants. Most people with chimerism don’t have symptoms and only find out through genetic testing. In cancer care, chimerism helps doctors monitor transplant success and guide treatment.

Chinese Weevils (Ulomoides dermestoides) are small beetles sometimes used in traditional and alternative medicine, including a practice called coleotherapy where live beetles are swallowed. They produce natural chemical compounds studied in labs, but their safety and effectiveness for cancer treatment are not proven. Patients should discuss any interest in these beetles with their healthcare team before considering use.

Chinese Weevils (Ulomoides dermestoides) are small beetles used in some traditional and alternative medicine practices. Known by names like Chinese beetles or gorgojo chino, they produce natural chemicals studied in labs. However, their safety and effectiveness for cancer treatment are not proven, and they are not part of standard cancer care. Patients should discuss any interest in these beetles with their healthcare team before considering use.

Chinese Meridian Theory is a traditional Chinese medicine idea that the body has invisible channels called meridians through which vital energy, or qi, flows. When this energy is blocked, it may cause pain or illness. Treatments like acupuncture, acupressure, cupping, or heat aim to restore the flow of qi and support healing. In cancer care, these methods are used as complementary therapies to help manage symptoms, not to replace standard treatments.

Chinese Rhubarb is the root of a plant used in traditional medicine, also known as Da-Huang, Indian Rhubarb, or Turkish Rhubarb. It may have anti-inflammatory and anticancer effects but is not a standard cancer treatment. Patients may hear about it when exploring natural or complementary therapies and should always discuss its use with their healthcare provider.

Chinese Weevils (Ulomoides dermestoides) are small beetles used in some traditional and alternative medicine practices, including swallowing live beetles in a method called coleotherapy. Though studied for their natural chemical compounds, they are not part of standard cancer treatments. Their safety and effectiveness remain unproven, and patients should discuss any interest in these beetles with their healthcare team.

Chinese Weevils (Ulomoides dermestoides) are small beetles used in some traditional and alternative medicine practices, including swallowing live beetles in a method called coleotherapy. They produce various chemical compounds studied in labs, but their safety and effectiveness for cancer treatment have not been proven. These beetles are not part of standard cancer care and may carry health risks. Patients should discuss any interest in such treatments with their healthcare team.

Chinese Weevils (Ulomoides dermestoides) are small beetles used in some traditional folk medicines where live beetles are swallowed. This practice, called coleotherapy, is promoted in parts of Asia and Latin America for conditions like cancer and asthma. However, there is no strong scientific evidence that swallowing these beetles is safe or effective for cancer or other diseases.

CHIR-265 is an experimental drug studied for melanoma, a type of skin cancer. It works by blocking proteins that help cancer cells grow and by preventing tumors from making new blood vessels. Researchers are testing it in clinical trials to see if it can slow or stop tumor growth. This entry helps connect the word with diagnoses, testing, treatments, supportive care, research notes, protocols, media, books, people, organizations, and safety concerns.

Chirhostim is a lab-made drug similar to the natural hormone secretin. It helps doctors diagnose certain pancreatic problems, such as gastrinomas—tumors that cause too much stomach acid. Chirhostim also increases pancreatic secretions and helps identify a small duct called the ampulla of Vater during diagnostic tests. It may also appear under related names such as Secretin Human, Synthetic Human Secretin.

Chiropractic care uses hands-on spinal adjustments and manual treatments to help improve joint alignment and ease muscle and joint pain. Some people with cancer use it alongside their medical care to help relieve pain, stiffness, swelling, and promote relaxation. It is not a treatment for cancer itself and must be carefully adapted to avoid risks related to cancer or its treatments.

Chiropractic therapy is a hands-on treatment where trained practitioners adjust the spine and other body parts to help relieve pain and improve movement. It may also include heat or ice, relaxation methods, and exercise. Often used for back pain, neck pain, headaches, or hand and foot problems, it is considered a complementary and alternative medicine approach that may support overall health.

Chitin is a natural sugar-based material found in the hard shells of shrimp, lobsters, and many insects. It is not a cancer or treatment but may appear in cancer research or medical discussions. Understanding chitin can help patients and caregivers follow information about new therapies or scientific studies involving natural materials.

Chlamydophila psittaci is a type of bacteria that can infect birds and humans. It mainly spreads through contact with infected birds and can cause lung infections called psittacosis. It may also infect the eye’s conjunctiva. This bacterium has been linked to a rare eye lymphoma called ocular adnexa MALT lymphoma, a cancer affecting tissues around the eye.

Chlorambucil, also called Leukeran, is a chemotherapy drug used mainly to treat certain blood cancers like chronic lymphocytic leukemia (CLL), Hodgkin lymphoma, and some non-Hodgkin lymphomas. It works by damaging cancer cells’ DNA to slow or stop their growth. Doctors may use it when other treatments aren’t suitable or to help control symptoms. It is taken by mouth and is being studied for other cancers as well.

Chlorambucil-Prednisone is a chemotherapy treatment combining two drugs, chlorambucil and prednisone, mainly used to treat chronic lymphocytic leukemia (CLL). Chlorambucil is a chemotherapy medicine that attacks cancer cells, while prednisone is a steroid that helps reduce inflammation and supports treatment. This combination, also called the CP regimen, may be part of a broader cancer care plan.

The Chlorambucil-Prednisone Regimen is a chemotherapy treatment combining two drugs, chlorambucil and prednisone, mainly used to treat chronic lymphocytic leukemia (CLL). Chlorambucil attacks cancer cells directly, while prednisone is a steroid that helps reduce inflammation and supports treatment. This combination can be more effective than using one drug alone and is part of some patients’ cancer care plans.

Chlorine is a chemical used to kill bacteria and other organisms in water and for cleaning. It is common in water treatment, swimming pools, and bleaching. In cancer care, chlorine may be mentioned when discussing safety, environmental exposures, or infection control, but it is not a cancer treatment itself. This entry helps connect the word with diagnoses, testing, treatments, supportive care, research notes, protocols, media, books, people, organizations, and safety concerns.

Chloroma is a rare cancer made of immature white blood cells called myeloblasts. It forms solid tumors outside the bone marrow and blood, sometimes appearing green under a microscope. Chloromas can develop anywhere in the body and are most often linked to acute myeloid leukemia or related blood disorders. It may also appear under related names such as Extramedullary Myeloid Tumor, Granulocytic Sarcoma, And Myeloid Sarcoma.

Chlorophyll-rich diets focus on eating green leafy vegetables and other plants high in chlorophyll, the pigment that gives plants their green color. These diets are sometimes discussed in cancer care to support nutrition, reduce inflammation, aid digestion, boost the immune system, and help patients tolerate treatment. They are not proven cancer treatments and should be used carefully with your healthcare team.

Chloroquinoxaline Sulfonamide (CQS) is an experimental drug being studied as a possible cancer treatment. It belongs to a group called topoisomerase inhibitors, which work by blocking enzymes cancer cells need to grow and divide. CQS is not yet approved for regular use and is usually available only through clinical trials or research studies.

Chlorotoxin is a substance from scorpion venom being studied to help detect and treat glioma, a type of brain cancer. It can attach to cancer cells in the brain and nervous system. A lab-made version called TM-601 is also being researched for its potential to stop cancer cells from spreading and to improve imaging during surgery.

Cholangiocarcinoma, also called bile duct cancer, is a rare cancer that starts in the bile ducts. These tubes carry bile, a fluid made by the liver, to the gallbladder and small intestine to help with digestion. This cancer can develop inside the liver (intrahepatic) or outside the liver (extrahepatic). It may also appear under related names such as Bile Duct Cancer.

Cholangiosarcoma is a rare tumor that develops in the connective tissues surrounding the bile ducts. These ducts carry bile from the liver to the small intestine to aid digestion. This type of tumor is different from more common bile duct cancers because it starts in supportive tissue rather than the lining cells. Understanding this term can help patients and caregivers discuss diagnosis and treatment options with their healthcare team.

Cholecalciferol, also called vitamin D3, is a nutrient your body needs to help build and keep strong bones and teeth. Your skin makes it when you spend time in sunlight, and you can also get it from foods like fatty fish and egg yolks or from supplements. It helps your body use calcium and phosphorus. Doctors may check vitamin D levels during cancer care to support bone health.

A cholelith, also called a gallstone, is a solid piece of material that forms in the gallbladder or common bile duct. Made mostly of cholesterol or other substances in bile, gallstones can be tiny or quite large. They often cause no symptoms but can sometimes block bile flow, leading to pain or digestive problems. In cancer care, gallstones may be mentioned if they affect bile ducts or appear on imaging tests.

Cholestasis is a condition where the flow of bile from the liver is blocked or slowed. Bile helps digest fats and remove waste. This blockage can happen inside the liver or in the bile ducts outside the liver. Cholestasis can cause symptoms like yellowing of the skin or eyes (jaundice), itching, and digestive problems. It may be important in cancer care if tumors or treatments affect the liver or bile ducts.

Cholesterol is a waxy, fat-like substance made by your liver and found in all body cells and blood. It helps build cell walls, hormones, vitamin D, and bile acids. You also get cholesterol from animal foods like egg yolks, meat, and dairy. While cholesterol is important for health, too much in the blood can lead to artery blockages and increase the risk of heart disease and stroke.

Choline is a nutrient related to vitamin B that your body needs daily to stay healthy. It helps build cell membranes, supports nerve communication, and helps remove fat from the liver. You can get choline from foods like eggs, beef liver, whole milk, soy, and peanuts. Because your body cannot store it for long, it’s important to include choline in your diet every day.

Choline magnesium trisalicylate, also called Trilisate, is a medicine used to relieve pain, swelling, and fever, often in conditions like arthritis. It belongs to a group of drugs called nonsteroidal anti-inflammatory drugs (NSAIDs). Researchers are also studying it as a possible treatment for a type of blood cancer called acute myeloid leukemia (AML).

A chondrocyte is a cell found in cartilage, the flexible tissue that cushions joints and shapes parts like the nose and ears. These cells make and maintain the materials that keep cartilage strong and flexible. The term may come up in cancer care when discussing tumors that start in cartilage, but it simply refers to a normal cell type.

Chondroitin sulfate is a natural sugar molecule found mainly in cartilage, the tissue that cushions and supports joints. It helps keep cartilage healthy and flexible. While it is not a cancer treatment, chondroitin sulfate may be mentioned in cancer care when discussing bone or joint health or side effects of treatment that affect joints.

A chondroma is a rare, slow-growing, noncancerous tumor made of cartilage that forms on or inside bones or soft tissues. It most often appears in the small bones of the hands or feet but can also develop in other bones like the ribs, pelvis, or skull. Most chondromas cause no symptoms, but sometimes they may lead to pain, swelling, or fractures.

Chondrosarcoma is a rare type of bone cancer that starts in cartilage, the flexible tissue covering the ends of bones. It most often develops in the pelvis, shoulder, ribs, or ends of long bones in the arms and legs. It usually affects adults over 40 years old. A rare form called extraskeletal chondrosarcoma grows in soft tissues instead of bone cartilage.

CHOP is a chemotherapy treatment combining four drugs—cyclophosphamide, doxorubicin, vincristine, and prednisone—mainly used to treat non-Hodgkin lymphoma. These medicines work together to attack cancer cells in different ways. CHOP is often called the CHOP regimen and is an important option in cancer care, though it may not be right for everyone. Side effects and responses vary, so it’s important to discuss this treatment with your healthcare team.

CHOP is a chemotherapy treatment combining four drugs—cyclophosphamide, doxorubicin, vincristine, and prednisone—mainly used to treat non-Hodgkin lymphoma. These medicines work together to attack cancer cells in different ways. CHOP is a common treatment option but may not be right for everyone. Side effects and responses vary, so it’s important to discuss this treatment with your healthcare team.

CHOPE is a chemotherapy treatment used to fight non-Hodgkin lymphoma, a cancer of the lymphatic system. It combines five drugs—cyclophosphamide, doxorubicin, vincristine, prednisone, and etoposide—that work together to attack cancer cells. This combination, called the CHOPE regimen, is part of a doctor’s plan to help control or shrink lymphoma. It may also appear under related names such as CHOPE Regimen.

The CHOPE regimen is a chemotherapy treatment combining five drugs—cyclophosphamide, doxorubicin, vincristine, prednisone, and etoposide—used to treat non-Hodgkin lymphoma, a cancer of the lymphatic system. It aims to kill cancer cells and help control the disease by attacking the lymphoma from different angles. It may also appear under related names such as CHOPE.

Chordoma is a rare, slow-growing cancer that starts in bones along the spine or at the base of the skull. It develops from leftover cells important in spine formation before birth. Symptoms depend on where the tumor grows. Diagnosis usually involves imaging tests and a biopsy. Treatment often includes surgery and sometimes radiation. Research is ongoing to find new therapies.

Chorioadenoma destruens, also called invasive hydatidiform mole, is a rare cancer that starts from pregnancy-related tissue. It grows into the muscular wall of the uterus and can spread to nearby areas like the vagina, vulva, and lungs. This condition develops after an egg is fertilized and involves abnormal growth of tissue linked to pregnancy.

The chorioallantoic membrane (CAM) is a thin, blood vessel-rich layer inside fertilized hen eggs that helps the developing chick embryo get oxygen and calcium. In cancer research, scientists use the CAM as a living model to study how tumors grow and respond to treatments. It is a research tool, not part of human cancer care.

Chorioblastoma is a rare, fast-growing cancer that starts in trophoblastic cells, which help an embryo attach to the uterus and form the placenta. It usually develops in the uterus after pregnancy but can also occur in the ovaries or testicles. This cancer can spread through the bloodstream, especially to the lungs. It is also called choriocarcinoma, chorioepithelioma, or chorionic carcinoma.

Choriocarcinoma is a rare, fast-growing cancer that starts in trophoblastic cells, which help an embryo attach to the uterus and form the placenta. It most often develops in the uterus after pregnancy but can also occur in the testis or ovary. This cancer can spread quickly through the bloodstream, especially to the lungs. It is also called chorioblastoma, chorioepithelioma, or chorionic carcinoma.

Chorioepithelioma is a rare, fast-growing cancer that starts in trophoblastic cells, which help an embryo attach to the uterus and form the placenta. It usually develops in the uterus after pregnancy but can also occur in the testicles or ovaries. This cancer can spread through the bloodstream, especially to the lungs. It is also called choriocarcinoma, chorioblastoma, or chorionic carcinoma.

Chorionic carcinoma is a rare, fast-growing cancer that starts in trophoblastic cells, which help an embryo attach to the uterus and form the placenta. It usually develops in the uterus after pregnancy but can also occur in the testis or ovary. This cancer can spread through the bloodstream, especially to the lungs, and is part of a group of diseases called gestational trophoblastic disease.

The choroid is a thin, middle layer of the eye’s wall located between the white outer layer (sclera) and the inner nerve layer (retina). It contains many blood vessels that supply oxygen and nutrients to the eye, helping keep it healthy and supporting clear vision. In cancer care, the choroid may be mentioned when discussing eye tumors or conditions affecting eye blood vessels.

The choroid plexus is a network of blood vessels and cells inside the brain’s fluid-filled spaces called ventricles. It produces cerebrospinal fluid (CSF), a clear liquid that cushions and protects the brain and spinal cord. Knowing about the choroid plexus can help you understand certain brain conditions and treatments, especially those involving brain fluid or rare tumors.

A choroid plexus tumor is a rare growth that develops in the choroid plexus, a network of blood vessels and cells inside the brain’s fluid-filled spaces. These tumors most often affect very young children, especially those under 2 years old. They can be benign (non-cancerous) or malignant (cancerous), which influences treatment and monitoring decisions.

CHPP, also called HIPEC, is a cancer treatment given during surgery. It involves bathing the abdominal cavity with a warm liquid containing chemotherapy drugs to kill cancer cells left after tumor removal. It is mainly used for cancers that have spread to the lining of the abdomen, called the peritoneum.

Chromaffin cells are special nerve-related cells mainly found in the adrenal glands above the kidneys. They produce hormones like adrenaline and noradrenaline that help the body respond to stress. These cells are important in cancer care because rare tumors can develop from them, affecting hormone levels and causing symptoms such as high blood pressure and rapid heartbeat.

Chromatin is the tightly packed material inside a cell’s nucleus made of DNA, proteins called histones, and RNA. It organizes DNA into structures called chromosomes by wrapping DNA strands around histones, forming units called nucleosomes. This packaging helps DNA fit inside the nucleus and supports important cell functions like copying and repairing DNA, which can affect how cancer cells grow and respond to treatment.

Chromatography is a lab method that separates the parts of a mixture using a gas or liquid to carry it through a special material. This separation helps scientists identify or measure substances in samples like blood or tissue. While patients usually don’t experience chromatography directly, it supports tests that help doctors understand cancer and guide treatment decisions.

Chromogranin A (CgA) is a protein made by neuroendocrine cells that release hormones into the blood. Higher than normal CgA levels may be found in people with certain neuroendocrine tumors, small cell lung cancer, prostate cancer, and other conditions. Measuring CgA in the blood helps doctors diagnose cancer, monitor treatment, or check if cancer has returned.

A chromosome is a structure inside most cells that carries genetic information. Humans usually have 46 chromosomes in each cell, arranged in 23 pairs. These chromosomes hold genes that guide how the body grows and functions. Changes in chromosomes can sometimes lead to cancer or other health problems. This entry helps connect the word with diagnoses, testing, treatments, supportive care, research notes, protocols, media, books, people, organizations, and safety concerns.

Chromosome 17 is one of the 23 pairs of chromosomes in most human cells. Changes in this chromosome can be linked to certain genetic conditions and some cancers, including bladder cancer, brain cancer, and leukemia. Doctors may check chromosome 17 to help diagnose cancer or monitor if it has returned.

Chromosome 17P deletion means that part or all of the short arm (called the p arm) of chromosome 17 is missing. This includes the loss of the TP53 gene, which helps control cell growth and prevent cancer. This genetic change is linked to some blood cancers like leukemia, multiple myeloma, and myelodysplastic syndrome. Doctors test for this deletion to help diagnose cancer, guide treatment, and understand prognosis.

Chromosome 3 is one of the 23 pairs of chromosomes in most human cells. Changes in chromosome 3 can be linked to certain genetic conditions and some cancers, such as bladder cancer. Testing for these changes may help doctors diagnose cancer or check if it has returned. This entry helps connect the word with diagnoses, testing, treatments, supportive care, research notes, protocols, media, books, people, organizations, and safety concerns.

Chromosome 7 is one of the 46 chromosomes in most human cells. Changes in chromosome 7 can be linked to some genetic conditions and cancers like bladder cancer, leukemia, and lymphoma. Doctors may check for these changes to help diagnose cancer or monitor if it has returned. This entry helps connect the word with diagnoses, testing, treatments, supportive care, research notes, protocols, media, books, people, organizations, and safety concerns.

Chronic bacterial prostatitis is a long-lasting bacterial infection of the prostate gland. It often causes recurring symptoms like pain in the lower back and genital area, burning during urination, body aches, and difficulty fully emptying the bladder. This condition can be hard to fully clear and may come back even after treatment.

Chronic bronchitis is a long-lasting lung condition where the large airways become inflamed and produce extra mucus. This causes a persistent cough and trouble breathing. Smoking is the main cause, but secondhand smoke, pollution, and chemical fumes can also contribute. It is a type of chronic obstructive pulmonary disease (COPD) that usually does not fully go away.

A chronic cough is a cough that lasts for 8 weeks or more. It may come with symptoms like a runny or stuffy nose, wheezing, shortness of breath, or heartburn. Causes include allergies, asthma, sinus infections, acid reflux, smoking, and sometimes cancer or its treatments. Treating the underlying cause often helps improve the cough.

A chronic disease is a health condition that lasts for three months or longer and may get worse over time. These diseases often affect older adults and can usually be managed but not cured. Common examples include cancer, heart disease, stroke, diabetes, and arthritis. Managing chronic diseases often involves ongoing medical care and lifestyle changes.

Chronic eosinophilic leukemia is a rare blood cancer where the body makes too many eosinophils, a type of white blood cell. These extra cells build up in the bone marrow, blood, and other tissues. The disease may stay stable for years or can change into a more aggressive form of leukemia, requiring careful medical monitoring.

Chronic Fatigue Syndrome (CFS) is a condition lasting more than six months where a person feels very tired most of the time. This tiredness does not improve with rest and can make it hard to concentrate or do daily tasks. Other symptoms may include sore throat, fever, muscle weakness, headaches, and joint pain. CFS can affect daily life and requires medical attention.

Chronic Granulocytic Leukemia, also called Chronic Myelogenous Leukemia or CML, is a slow-growing cancer of the blood and bone marrow. It happens when the body makes too many immature white blood cells called myeloblasts. CML mainly affects adults and may cause symptoms like tiredness, fever, easy bleeding, or an enlarged spleen. It often involves a genetic change called the Philadelphia chromosome.

Chronic heart failure (CHF) is a long-term condition where the heart cannot pump blood well enough to meet the body’s needs. It often develops slowly and causes symptoms like shortness of breath, tiredness, trouble exercising, and swelling in the feet, ankles, or belly. CHF mainly affects older adults and can be linked to heart disease, heart attacks, or high blood pressure.

Chronic idiopathic myelofibrosis is a long-term condition where scar tissue replaces the bone marrow, the body’s blood cell factory. This causes blood cells to be made in other organs like the liver and spleen, often leading to an enlarged spleen and anemia. It is also called primary myelofibrosis or agnogenic myeloid metaplasia.

Chronic kidney disease (CKD) is a long-lasting condition where the kidneys slowly lose their ability to filter waste and extra water from the blood. This can cause harmful imbalances in the body’s minerals and chemicals. CKD often has no symptoms until it is advanced and is most commonly caused by diabetes and high blood pressure. While there is no cure, treatments and lifestyle changes can help slow its progression.

Chronic leukemia is a slow-growing cancer that starts in the bone marrow and causes the body to make too many abnormal white blood cells. It often develops in adults and may not cause symptoms at first. Over time, it can affect the blood and other parts of the body, leading to problems like infections, anemia, and easy bleeding.

Chronic lung disease (CLD) refers to long-lasting lung conditions that develop slowly and may worsen over time. These diseases affect breathing and lung function and can be caused by smoking, secondhand smoke, chemical fumes, dust, or air pollution. Common types include asthma, COPD, and pulmonary fibrosis. It may also appear under related names such as CLD.

Chronic lymphocytic leukemia (CLL) is a slow-growing cancer where too many abnormal lymphocytes, a type of white blood cell, build up mainly in the blood and bone marrow. It mostly affects adults over 50 and may cause symptoms like swollen lymph nodes, fatigue, or easy bruising. In later stages, it can spread to lymph nodes and be called small lymphocytic lymphoma.

Chronic lymphocytic leukemia/small lymphocytic lymphoma (CLL/SLL) is a slow-growing cancer that affects lymphocytes, a type of white blood cell. In CLL, cancer cells mainly build up in the blood and bone marrow, while in SLL, they are mostly found in the lymph nodes. Both are forms of non-Hodgkin lymphoma and represent the same disease with different patterns of involvement.

Chronic myelogenous leukemia (CML) is a slow-growing cancer of the blood and bone marrow. It causes too many immature white blood cells called myeloblasts to build up, crowding out healthy cells. CML mainly affects adults and may cause symptoms like tiredness, fever, or easy bleeding. It often involves a genetic change called the Philadelphia chromosome.

Chronic myeloid leukemia (CML) is a slow-growing cancer of the blood and bone marrow. It causes the body to make too many immature white blood cells called myeloblasts. CML usually affects adults and may cause symptoms like tiredness, fever, or easy bleeding. It often involves a specific genetic change called the Philadelphia chromosome.

Chronic Myelomonocytic Leukemia (CMML) is a slowly developing blood disorder where the bone marrow makes too many myelomonocytes, a type of white blood cell. This excess crowds out normal blood cells like red blood cells and platelets, which can cause tiredness, easy bruising, bleeding, and infections. It may also appear under related names such as CMML.

Chronic myeloproliferative neoplasms (MPNs) are blood diseases where the bone marrow makes too many blood cells, such as red blood cells, platelets, or certain white blood cells. These conditions usually develop slowly and can cause symptoms like fatigue, bleeding, anemia, or infections. Some types may change into a more serious leukemia over time.

Chronic neutrophilic leukemia is a rare blood disorder where the body makes too many neutrophils, a type of white blood cell. This excess can cause the spleen and liver to become enlarged. The disease may stay stable for years or sometimes progress quickly into a more serious form of leukemia.

Chronic Obstructive Pulmonary Disease (COPD) is a long-lasting lung condition that causes damage to the airways and air sacs, making it hard to breathe. It includes chronic bronchitis and emphysema. COPD usually develops over many years, often due to smoking, and can cause symptoms like shortness of breath, cough, and tiredness.

Chronic pain is pain that lasts longer than three months. It can be mild or severe, constant or come and go. In cancer care, chronic pain may come from the cancer itself, treatments, or side effects. Managing chronic pain is important to improve comfort and quality of life. This entry helps connect the word with diagnoses, testing, treatments, supportive care, research notes, protocols, media, books, people, organizations, and safety concerns.

The chronic phase is the early stage of certain blood cancers like chronic myelogenous leukemia (CML) and chronic lymphocytic leukemia (CLL). In this phase, abnormal white blood cells are higher than normal but fewer than in later stages. Many people are diagnosed during this phase, which often progresses slowly and responds well to treatment.

Chronic Phase Chronic Myelogenous Leukemia (CML) is an early stage of a blood cancer where fewer than 10% of blood and bone marrow cells are immature blast cells. This phase often has no symptoms and can last months or years. Regular monitoring and treatment during this phase help manage the disease and prevent progression.

Chronic prostatitis/chronic pelvic pain syndrome (CP/CPPS) is a long-lasting condition causing pain and discomfort in the prostate area. It can lead to symptoms like lower back and genital pain, burning during urination, and trouble fully emptying the bladder. CP/CPPS is not cancer but can affect prostate health and urinary function, sometimes raising PSA levels checked during prostate cancer screening.

Chrysotherapy, also called aurotherapy or gold therapy, is a treatment using gold salts to reduce inflammation in diseases like rheumatoid arthritis. It is not commonly used to treat cancer directly but may appear in cancer care discussions related to managing inflammation or immune system effects. Knowing this term helps patients understand medical reports and conversations about their care.

CHS 828 is an experimental drug being studied to treat solid tumors, which are lumps of cancer cells in organs or tissues. It is not yet approved for general use and is available only through clinical trials. Patients may hear about CHS 828 when exploring new treatment options or research studies.

Chyle is a milky-white fluid made in the small intestine during digestion. It contains lymph fluid and fats and travels through special lymph vessels to the bloodstream. In cancer care, chyle may be mentioned when lymph vessels are affected, sometimes causing fluid leaks or swelling. This entry helps connect the word with diagnoses, testing, treatments, supportive care, research notes, protocols, media, books, people, organizations, and safety concerns.

CI-1033, also known as canertinib dihydrochloride, is an experimental drug studied for some cancers. It works by blocking proteins called epidermal growth factor receptors (EGFR) that help cancer cells grow. By interfering with these signals, it may slow cancer growth or cause cancer cells to die. CI-1033 belongs to a group of medicines called tyrosine kinase inhibitors and is usually available only in clinical trials.

CI-958, also called sedoxantrone trihydrochloride, is an experimental drug studied for treating some cancers. It works by attaching to DNA in cells, including cancer cells, and blocking their ability to repair DNA damage and make new DNA, RNA, and proteins. This may help stop cancer cells from growing. CI-958 is not yet a standard treatment and is mainly used in clinical trials.

CI-980, also called Mivobulin Isethionate, is a cancer drug that works by blocking cell division. It belongs to a group of medicines called mitotic inhibitors, which aim to slow or stop the growth of cancer cells. This drug may be part of treatment plans or clinical trials for certain cancers, but its use depends on the individual patient’s situation.

CI-994, also called N-acetyldinaline, is an experimental drug being studied as a possible treatment for non-small cell lung cancer. It is not yet approved for routine use but may be available through clinical trials exploring new ways to control or shrink this type of lung cancer. It may also appear under related names such as N-Acetyldinaline.

Cialis, also known as tadalafil, is a medicine used to treat erectile dysfunction by increasing blood flow to the penis. It works by blocking an enzyme that limits blood flow, helping men achieve an erection when sexually stimulated. Cialis is also being studied to help men with sexual problems after prostate cancer treatments like surgery or radiation.

Cidofovir is a medicine used to treat viral infections, especially in people with weakened immune systems, such as some cancer patients. It helps stop viruses from multiplying, supporting the body’s ability to fight infection during cancer treatment. Cidofovir is not a cancer treatment but may be prescribed to manage infections that can complicate cancer care.

A cigar is a tobacco product made by rolling cured tobacco leaves into a tube and wrapping it with tobacco leaf or similar material. It is lit on one end and smoked, usually without inhaling the smoke. Cigars contain nicotine and harmful chemicals that can cause addiction and increase the risk of cancers and other serious health problems.

A cigarette is a small tube of finely cut tobacco wrapped in paper, lit and smoked with the smoke inhaled into the lungs. It contains nicotine, which causes addiction, and many harmful chemicals that increase the risk of cancers and other serious health problems. Smoking cigarettes is a leading cause of lung and other cancers, as well as heart and lung diseases.

Cilengitide, also called EMD 121974, is an experimental drug being studied for cancer treatment. It works by blocking the growth of new blood vessels that tumors need to grow. Currently, it is not a standard treatment but may be available through clinical trials where its safety and effectiveness are being tested.

The ciliary body is a part of the eye located just behind the iris, the colored part of the eye. It contains a ring-shaped muscle that helps the eye focus by changing the shape of the lens. It also produces aqueous humor, the clear fluid that fills the space between the cornea and iris, helping keep the eye healthy and maintaining proper eye pressure.

Ciltacabtagene autoleucel, also called Carvykti, is a treatment for adults with multiple myeloma when the cancer has returned or not improved after certain prior therapies. It uses specially changed immune cells to target and kill myeloma cells, especially when other treatments like lenalidomide have not worked. It may also appear under related names such as Carvykti.

Cimetidine is a medicine that reduces stomach acid and is commonly used to treat ulcers and heartburn. In cancer care, it may also help prevent allergic reactions or manage side effects, but it is not a cancer treatment itself. If you hear about cimetidine during your care, ask your healthcare team how it fits into your treatment plan.

CIN, or Cervical Intraepithelial Neoplasia, means abnormal cells found on the cervix’s surface during a biopsy. It is caused by certain types of human papillomavirus (HPV). CIN is not cancer but can sometimes develop into cancer if untreated. It is graded from 1 to 3 based on how abnormal the cells look and how much tissue is affected.

CIN 1 means mild abnormal changes in the cells on the surface of the cervix, usually caused by certain types of human papillomavirus (HPV). It is not cancer and often goes away without treatment, but it can sometimes progress to more serious changes if not monitored carefully. It may also appear under related names such as Cervical Squamous Intraepithelial Neoplasia 1.

CIN 2 means moderately abnormal cells were found on the surface of the cervix, usually caused by certain types of human papillomavirus (HPV). It is not cancer but is considered a precancerous condition that can develop into cancer if untreated. Treatment often involves removing or destroying these abnormal cells to prevent progression.

CIN 2/3 means a cervical biopsy found moderately to severely abnormal cells on the cervix’s surface, caused by certain high-risk human papillomavirus (HPV) infections. It is not cancer but can develop into cancer if untreated. Treatment aims to remove or destroy these abnormal cells to prevent cancer. It may also appear under related names such as Cervical Squamous Intraepithelial Neoplasia 2/3.

CIN 3 means severely abnormal cells were found on the cervix’s surface during a biopsy. Caused by certain high-risk human papillomavirus (HPV) infections, CIN 3 is not cancer but is a serious precancerous condition that can develop into cervical cancer if untreated. Treatment usually involves removing or destroying these abnormal cells to protect cervical health.

Cinvanti is a medicine used with other drugs to help prevent nausea and vomiting caused by chemotherapy or surgery. It works by blocking a chemical in the brain that triggers these symptoms. Also known as aprepitant or Emend, Cinvanti belongs to a group of drugs called neurokinin 1 receptor antagonists.

Cipro, also called ciprofloxacin, is an antibiotic used to treat bacterial infections. It belongs to a group of drugs called fluoroquinolones. In cancer care, Cipro is mainly used to prevent or treat infections when the immune system is weakened. Researchers are also studying its possible role in treating bladder cancer, but it is not a standard cancer treatment.

Ciprofloxacin, also called Cipro, is an antibiotic used to treat bacterial infections. It belongs to a group called fluoroquinolones. In cancer care, ciprofloxacin helps prevent or treat infections in patients with weakened immune systems. Researchers are also studying it for bladder cancer, but it is not a standard cancer treatment.

Circadian rhythm is your body’s natural 24-hour cycle that controls changes in sleep, hormone levels, appetite, body temperature, and other important functions. It is mainly influenced by light and darkness and helps regulate when you feel awake or sleepy. In cancer care, disruptions to this rhythm can affect symptoms like fatigue and appetite changes.

Circadian Rhythm Nutrition is an eating approach that aligns meal times with your body’s natural 24-hour biological clock. In cancer care, it is sometimes explored to support nutrition, metabolism, digestion, immune health, and how well you tolerate treatments. While it may be part of supportive care or alternative approaches, its safety and benefits should always be discussed with your healthcare team.

A circulating tumor cell (CTC) is a cancer cell that has broken away from the original tumor and entered the bloodstream. These cells can travel through the blood and may form new tumors in other parts of the body. Doctors can sometimes detect CTCs using a blood test to learn more about the cancer and help guide treatment decisions.

Circulating tumor DNA (ctDNA) are tiny pieces of DNA released into the bloodstream when cancer cells die. A blood test can detect ctDNA to find genetic changes in the tumor. This helps doctors diagnose some cancers, plan treatment, monitor response, or check if cancer has returned. It is a less invasive way to learn about the tumor compared to traditional biopsies.

A circulating tumor marker is a substance, such as a protein or piece of DNA, released by cancer cells or the body into blood, urine, or other fluids. Doctors measure these markers to help detect cancer, guide treatment, and monitor how well treatment is working. Because other conditions can also raise these markers, they are used together with other tests for a clearer diagnosis.

Circulation is the movement of blood through the heart and blood vessels, and lymph through lymph vessels. It delivers oxygen and nutrients to the body and removes waste. In cancer care, circulation is important because it can affect how cancer cells spread and how treatments reach the body. This entry helps connect the word with diagnoses, testing, treatments, supportive care, research notes, protocols, media, books, people, organizations, and safety concerns.

The circulatory system is made up of the heart and blood vessels that move blood throughout the body. It delivers oxygen and nutrients to tissues and removes waste. The lymph system, which works closely with blood vessels, is often included as part of this system. Understanding it is important in cancer care because cancer cells can spread through blood or lymph vessels, and some treatments may affect heart or blood vessel health.

Circumcision is a surgical procedure that removes the foreskin, the loose skin covering the tip of the penis. It is often done in newborn boys for cultural, religious, or medical reasons. Circumcision may reduce the risk of some infections and penile problems but also carries risks like bleeding and pain.

Cirrhosis is a long-term liver disease where healthy liver tissue is replaced by scar tissue. This scarring blocks blood flow and reduces liver function. It often has no symptoms until the liver is seriously damaged. Common causes include heavy alcohol use, chronic hepatitis infections, and some genetic or autoimmune conditions. Cirrhosis raises the risk of liver cancer and requires ongoing medical care.

The Cancer Information Service (CIS) is a free, confidential program from the National Cancer Institute that provides easy-to-understand answers to questions about cancer. CIS helps patients, caregivers, and others with information on prevention, treatment, symptoms, clinical trials, and quitting smoking. You can reach CIS by phone or online chat in English and Spanish.

CISNET is a group of researchers funded by the National Cancer Institute who use computer models to study how cancer prevention, screening, and treatment affect cancer cases and deaths. Their work helps guide cancer control strategies and policies for cancers like breast, colorectal, esophageal, lung, and prostate. It may also appear under related names such as Cancer Intervention, Surveillance Modeling Network.

Cisplatin is a chemotherapy drug that contains platinum and is used to treat certain cancers such as bladder, ovarian, and testicular cancer. It works by damaging the DNA inside cancer cells, which helps stop their growth and causes them to die. Cisplatin may be given alone or combined with other cancer medicines.

Citalopram, also known as Celexa, is a medication used to treat depression and sometimes anxiety. It belongs to a group called selective serotonin reuptake inhibitors (SSRIs) that help improve mood by balancing brain chemicals. In cancer care, it may be prescribed to help manage emotional challenges related to diagnosis or treatment.

Citric Acid/Potassium-Sodium Citrate is a medicine used to treat metabolic acidosis, a condition where the blood becomes too acidic. It helps restore the body’s acid balance, which can be important for people with certain health issues, including some related to cancer or its treatment. This entry helps connect the word with diagnoses, testing, treatments, supportive care, research notes, protocols, media, books, people, organizations, and safety concerns.

Citrovorum factor, also called folinic acid or leucovorin calcium, is a form of folic acid used in cancer treatment and some types of anemia. It is often given with chemotherapy drugs to help make treatment more effective or to reduce side effects. It is not a chemotherapy drug itself but supports other medicines in cancer care.

Cixutumumab (also called IMC-A12) is a laboratory-made antibody being studied as a treatment for some cancers. It works by blocking a protein called the insulin-like growth factor-1 receptor (IGF-1R), which some cancer cells need to grow. By interfering with this protein, cixutumumab may help slow or stop cancer growth. It is not yet a standard treatment and is mainly used in clinical trials.

Chronic Kidney Disease (CKD) is a long-term condition where the kidneys slowly lose their ability to filter waste, extra water, and balance important minerals in the blood. It often has no symptoms early on but can lead to serious health problems like kidney failure and heart disease. Managing CKD involves medicines and lifestyle changes to protect kidney health and slow the disease’s progress.

Cladribine is a medicine used mainly to treat hairy cell leukemia, a rare blood cancer affecting certain white blood cells. It works by damaging the DNA inside cancer cells to help stop their growth. Cladribine belongs to a group of drugs called antimetabolites. It is given under a doctor’s care and may cause side effects that should be discussed with your healthcare team.

Clarithromycin is an antibiotic medicine used to treat bacterial infections. It belongs to a group called macrolides. In cancer care, clarithromycin may be given to help prevent or treat infections, especially when treatments like chemotherapy weaken the immune system. It is not a cancer treatment but supports overall health during therapy.

Clark Level I Skin Cancer is an early stage of skin cancer where cancer cells are found only in the epidermis, the outermost layer of the skin. This means the cancer has not grown deeper into the skin layers. Knowing this can help patients understand their diagnosis and treatment options.

Clark Level II Skin Cancer means the cancer has grown from the outer skin layer (epidermis) into the thin upper part of the second skin layer (papillary dermis). This helps doctors understand how deeply the cancer has spread in the skin, which can guide treatment and follow-up care decisions. This entry helps connect the word with diagnoses, testing, treatments, supportive care, research notes, protocols, media, books, people, organizations, and safety concerns.

Clark Level III skin cancer is a type of melanoma that has grown into the upper thin layer of the skin’s dermis called the papillary dermis, but has not reached the thicker lower layer known as the reticular dermis. This level helps doctors understand how deeply the melanoma has spread within the skin, which can be important for planning treatment.

Clark Level IV skin cancer describes a melanoma that has grown deeply into the reticular dermis, the thick lower layer of the skin’s dermis. This level of invasion helps doctors understand how far the cancer has spread within the skin and can influence treatment decisions and monitoring. This entry helps connect the word with diagnoses, testing, treatments, supportive care, research notes, protocols, media, books, people, organizations, and safety concerns.

Clark Level V skin cancer means the cancer has grown deeply into the subcutaneous tissue, the fat and connective layer beneath the skin. This level of invasion helps doctors understand how far the cancer has spread under the skin and can influence treatment decisions. It is often mentioned in pathology reports after a biopsy or surgery.

Clark Levels describe how deeply melanoma or other skin cancers have grown into the layers of the skin. The system uses five levels, from I to V, to show which skin layers are involved. Knowing the Clark Level helps doctors understand the cancer’s extent and plan treatment, but it is just one part of the overall diagnosis.

The Hulda Clark Protocol, also known as the Clark Zapper, is an alternative health approach involving a device called the Zapper and other methods like herbal cleanses and toxin avoidance. It is discussed in some cancer circles for claims about pain relief, energy, inflammation, immune support, and detoxification. However, it is not supported by scientific evidence as a cancer cure or treatment and should be approached with caution.

Classic familial adenomatous polyposis (FAP) is an inherited condition where hundreds to thousands of abnormal growths called polyps develop inside the colon and rectum. These polyps can turn into colorectal cancer if not treated. People with classic FAP have a very high risk of developing colorectal cancer early in life and may also face risks for other cancers and health issues.

Classic familial polyposis, also called familial adenomatous polyposis (FAP), is an inherited condition where hundreds to thousands of abnormal growths called polyps develop inside the colon and rectum. These polyps can turn into colorectal cancer if not treated. People with this condition have a very high risk of developing colorectal cancer early in life and may also face risks for other cancers and health issues.

Classic FAP (Familial Adenomatous Polyposis) is an inherited condition where hundreds to thousands of abnormal growths called polyps develop inside the colon and rectum. These polyps can turn into colorectal cancer if not treated. People with classic FAP have a very high risk of developing colorectal cancer early in life and may also face risks for other cancers and health issues.

Classic Hodgkin Lymphoma is the most common type of Hodgkin lymphoma, a cancer that starts in the immune system’s lymph nodes. It is identified by special cells called Reed-Sternberg cells. Symptoms may include swollen lymph nodes, fever, night sweats, and fatigue. Knowing this term helps patients and caregivers understand diagnosis and treatment discussions related to this cancer.

The Claus Model is a computer tool that estimates breast cancer risk based on family history. It looks at which relatives had breast cancer, their ages at diagnosis, and how closely related they are. This helps doctors and patients understand risk and consider screening or prevention options. It does not include lifestyle or genetic test results and is one part of a broader risk assessment.

The clavicle, or collarbone, is one of two long, thin bones at the base of the front of your neck. It connects the breastbone (sternum) to the shoulder blades (scapulae), helping support shoulder movement and protecting important nerves and blood vessels in the neck and upper chest area. It may also appear under related names such as Collarbone.

Chronic Lung Disease (CLD) refers to a group of lung conditions that develop slowly and may worsen over time. These diseases affect breathing and lung function and can be caused by smoking, secondhand smoke, chemical fumes, dust, or air pollution. Common types include asthma, chronic obstructive pulmonary disease (COPD), and pulmonary fibrosis.

Clear cell describes cells that look clear or empty inside under a microscope. This term often appears in cancer reports to describe how certain cancer cells look. It helps doctors classify some cancers, like kidney or ovarian cancers, but does not by itself explain symptoms or treatment outcomes. Patients may hear this term when discussing their diagnosis or treatment.

Clear Cell Adenocarcinoma, also called Clear Cell Carcinoma, is a rare cancer where the cells look clear under a microscope. It most often affects the kidney and female reproductive organs like the cervix and vagina. Some cases are linked to prenatal exposure to the drug DES. Understanding this cancer helps patients and caregivers recognize its unique features and the importance of specialized care.

Clear Cell Carcinoma is a rare cancer where the cancer cells look clear under a microscope. It most often affects the kidney and female reproductive organs like the cervix and vagina. Sometimes called Clear Cell Adenocarcinoma, this cancer may be linked to prenatal exposure to the drug DES. Knowing this term can help patients and caregivers understand specific cancer types and related health information.

Clear cell renal cell cancer (ccRCC) is the most common type of kidney cancer in adults. It starts in the cells lining tiny tubes in the kidney that filter blood. Under a microscope, these cancer cells look clear or pale. Symptoms may include blood in the urine or pain, but sometimes the cancer is found during imaging tests done for other reasons.

Clear cell renal cell carcinoma (ccRCC) is the most common type of kidney cancer in adults. It starts in the cells lining tiny tubes in the kidney that filter blood. Under a microscope, these cancer cells look clear or pale. Some people with inherited conditions like von Hippel-Lindau syndrome have a higher risk of developing this cancer.

Clear cell sarcoma of soft tissue is a rare cancer that starts in tendons, the strong cords connecting muscles to bones. It most often appears in the arms or legs of young adults. Under the microscope, it can look like melanoma, a skin cancer. This tumor may spread to nearby lymph nodes, small immune system organs that help fight disease.

Clear cell sarcoma of the kidney is a rare type of kidney cancer where the cancer cells look clear under a microscope. It can spread from the kidney to other parts of the body, most often to the bones, but also to the lungs, brain, and soft tissues. Understanding this cancer helps guide diagnosis and treatment.

A clear liquid diet includes only see-through liquids and foods like water, broth, plain tea or coffee, gelatin, popsicles, and juices without pulp. It is easy to digest and often used for a short time before medical tests or after surgery to help the digestive system rest and heal. This diet does not provide enough calories or nutrients for long-term use.

Cleaved describes how certain cells look under a microscope when their nuclei appear divided or segmented. This term helps doctors understand details about cell appearance that may be important in diagnosing or monitoring some cancers. Its meaning can vary depending on the type of cancer and the context in which it is used.

Clergy are ordained religious leaders who provide spiritual and emotional support to patients and families facing cancer. They offer comfort, guidance, and a listening ear during difficult times, such as hospital stays or treatment decisions. Clergy support is part of holistic care but does not replace medical treatment. This entry helps connect the word with diagnoses, testing, treatments, supportive care, research notes, protocols, media, books, people, organizations, and safety concerns.

CLIA stands for Clinical Laboratory Improvement Amendments, a set of U.S. federal rules that ensure laboratories testing human samples like blood or tissue meet quality standards. These rules help make sure your lab test results are accurate and reliable, which is important for diagnosing and treating diseases such as cancer.

Clinical means anything related to the direct care of patients, including exams, tests, and treatments done by healthcare providers. In cancer care, it often refers to medical activities performed in a healthcare setting, such as a doctor’s office or hospital. Understanding when something is clinical helps you know how it fits into your care plan.

A Clinical Breast Exam (CBE) is a physical check of the breasts and underarms done by a health care provider to feel for lumps or other unusual changes. It helps find changes that might need further tests but is not enough alone to screen for breast cancer. It is often part of routine breast health care alongside other tests like mammograms.

A clinical diagnosis is when a doctor identifies a possible disease or condition by examining your symptoms, health history, and physical exam. It is often the first step before ordering tests like blood work, scans, or biopsies to confirm what’s happening. This initial judgment helps guide your care but is not a final diagnosis.

The Clinical Laboratory Improvement Amendments (CLIA) are U.S. federal rules that set quality standards for lab tests done on human samples like blood or tissue. These rules help ensure that test results used to diagnose or treat diseases, including cancer, are accurate and reliable. CLIA is managed by federal agencies to oversee lab quality and safety.

Clinical Practice Guidelines are trusted recommendations created by experts to help doctors and patients make informed decisions about screening, prevention, or treatment for specific health conditions, including cancer. They provide clear advice based on current research to support consistent and effective care. This entry helps connect the word with diagnoses, testing, treatments, supportive care, research notes, protocols, media, books, people, organizations, and safety concerns.

Clinical research studies people and their health information to learn more about diseases and improve care. It includes clinical trials that test new treatments and natural history studies that observe how diseases develop. This research helps doctors find better ways to detect, diagnose, treat, and prevent illnesses, including cancer. This entry helps connect the word with diagnoses, testing, treatments, supportive care, research notes, protocols, media, books, people, organizations, and safety concerns.

Clinical research costs are the expenses related to taking part in a cancer treatment clinical trial. These may include the study drug, special tests, or extra visits required only for the trial. Health insurance often does not cover these costs, but sometimes the trial sponsor, like a drug company, may pay for them. Knowing about these costs helps patients plan and decide about joining a trial.

A clinical researcher is a health professional who studies health and disease by working with patients or using patient data. They help develop new treatments and improve health care, often through clinical trials. In cancer care, clinical researchers play a key role in finding safer and better ways to treat cancer and improve patient outcomes.

Clinical resistance happens when cancer does not shrink or improve after treatment. It means the cancer is not responding as expected to medicines or therapies. Understanding clinical resistance can help patients and caregivers talk with their care team about treatment options and what to expect next. This entry helps connect the word with diagnoses, testing, treatments, supportive care, research notes, protocols, media, books, people, organizations, and safety concerns.

A clinical series is a group of patients treated at a clinic or medical facility whose cases are studied together. It helps doctors learn from real patient experiences to understand treatment effects, side effects, and disease progress in everyday care settings. Unlike clinical trials, clinical series usually involve fewer patients and do not compare treatments in a controlled way.

Clinical stage describes how much cancer is in the body and where it may have spread, based on tests done before surgery. These tests include physical exams, imaging scans, blood tests, and biopsies. Knowing the clinical stage helps doctors plan treatment and understand the cancer’s extent early on. This entry helps connect the word with diagnoses, testing, treatments, supportive care, research notes, protocols, media, books, people, organizations, and safety concerns.

Clinical staging is how doctors estimate the size and spread of cancer using tests done before surgery. These tests include physical exams, imaging scans, blood tests, and biopsies. Knowing the clinical stage helps guide treatment choices and gives an early understanding of the cancer’s extent. This entry helps connect the word with diagnoses, testing, treatments, supportive care, research notes, protocols, media, books, people, organizations, and safety concerns.

A clinical study, also called a clinical trial, is a research study that tests new ways to find, prevent, diagnose, or treat diseases in people. These studies help doctors learn if new medical approaches are safe and effective. Clinical studies are important in cancer care and may be offered as part of treatment options.

A clinical trial, also called a clinical study, is a research study that tests new medical methods in people. These studies help doctors learn if new ways to prevent, find, or treat diseases like cancer are safe and effective. Clinical trials may offer patients access to new treatments and are carefully monitored to protect safety.

Clinical trial phases are steps in research that test new cancer treatments for safety and effectiveness. Phase I finds the best dose and how to give the treatment. Phase II checks if the treatment works on the cancer. Later phases compare new treatments to standard ones and monitor long-term effects after approval.

A clinical trial sponsor is the person, company, or organization that manages and funds a clinical trial. They oversee the study, collect and analyze data, and help ensure the trial is done safely and properly. Sponsors play an important role in cancer research by supporting the development of new treatments and making sure trials follow rules to protect patients.

A clinician is a healthcare professional who provides direct care to patients. In cancer care, clinicians include doctors, nurses, physician assistants, and other specialists who help diagnose, treat, and support people with cancer. The term is broad and refers to anyone involved hands-on in your care. This entry helps connect the word with diagnoses, testing, treatments, supportive care, research notes, protocols, media, books, people, organizations, and safety concerns.

The clivus is a bone at the base of the skull, near where the spine begins. It supports important brain structures and is a location where rare tumors like chordomas and chondrosarcomas can develop. Knowing about the clivus helps patients and caregivers understand medical information related to brain and spine cancers.

Chronic lymphocytic leukemia (CLL) is a slow-growing cancer where too many abnormal white blood cells called lymphocytes build up mainly in the blood and bone marrow. It often develops gradually and may later affect lymph nodes. CLL is most common in adults over 50 and can cause symptoms like swollen lymph nodes, fatigue, and easy bruising.

CLL/SLL is a slow-growing cancer affecting lymphocytes, a type of white blood cell. It is the same disease with two names: chronic lymphocytic leukemia (CLL) when cancer cells are mainly in the blood and bone marrow, and small lymphocytic lymphoma (SLL) when they are mostly in the lymph nodes. CLL/SLL is a type of non-Hodgkin lymphoma and often grows slowly, sometimes requiring monitoring before treatment.

Clodronate is a medicine used to treat high calcium levels in the blood and to help manage cancer that has spread to the bones. It may reduce bone pain, lower the risk of fractures, and slow the growth of new bone problems caused by cancer. This entry helps connect the word with diagnoses, testing, treatments, supportive care, research notes, protocols, media, books, people, organizations, and safety concerns.

Clofarabine (brand name Clolar) is a chemotherapy drug used to treat children and young adults aged 1 to 21 years with acute lymphoblastic leukemia (ALL) that has returned or not improved after at least two other treatments. It works by blocking cancer cells from making DNA, which may help stop their growth. Clofarabine is also being studied for other cancers.

Clolar, also called clofarabine, is a chemotherapy drug used to treat children and young adults aged 1 to 21 years with acute lymphoblastic leukemia (ALL) that has returned or not improved after at least two other treatments. It works by blocking cancer cells from making DNA, which may help stop their growth. Clolar is given under medical supervision and is being studied for other cancers.

Clonidine hydrochloride, also called Catapres, is a medicine mainly used to lower high blood pressure by relaxing blood vessels. In cancer care, it may also help manage certain types of cancer-related pain and support quitting smoking. It is not a cancer treatment but can be part of symptom management or overall health care during cancer treatment.

Cloretazine, also called laromustine or Onrigin, is a chemotherapy drug used mainly to treat acute myelogenous leukemia (AML). It works by damaging the DNA of cancer cells, which may stop their growth or kill them. Researchers are also studying it for other cancers. Cloretazine belongs to a group of drugs called alkylating agents.

Clostridium difficile (C. difficile) is a type of bacteria that can cause diarrhea and intestinal problems, especially in people who have taken antibiotics or are in hospitals. It is important to know about C. difficile during cancer treatment because it can affect gut health and may complicate care. This entry helps connect the word with diagnoses, testing, treatments, supportive care, research notes, protocols, media, books, people, organizations, and safety concerns.

A clove cigarette, also called kretek, is a cigarette made in Indonesia from tobacco, cloves, and other ingredients. Like regular cigarettes, clove cigarettes contain nicotine and many harmful chemicals that can cause addiction, lung cancer, and other lung diseases. Both smokers and people nearby can be harmed by clove cigarette smoke.

CM-AVM syndrome is a rare inherited condition that causes small pink or red spots on the skin, often on the face, arms, or legs. These spots come from swollen tiny blood vessels called capillaries. The syndrome can also cause more serious blood vessel problems in organs like the brain and heart, which may lead to symptoms such as bleeding or seizures.

CMF is a chemotherapy treatment combining three drugs—cyclophosphamide, methotrexate, and fluorouracil—mainly used to treat breast cancer. This drug combination attacks cancer cells in different ways and may be given alone or with other therapies. CMF is also being studied for other cancers and is given in cycles with rest periods to help the body recover.

The CMF regimen is a chemotherapy treatment combining three drugs—cyclophosphamide, methotrexate, and fluorouracil—mainly used to treat breast cancer. These drugs work together to attack cancer cells in different ways. CMF may be given alone or with other treatments and is given in cycles with rest periods to help the body recover.

Chronic myeloid leukemia (CML) is a slow-growing cancer of the blood and bone marrow. It causes the body to make too many immature white blood cells called myeloblasts. CML mainly affects adults and may cause symptoms like tiredness, fever, and easy bleeding. Most cases involve a genetic change called the Philadelphia chromosome, which helps guide treatment.

Chronic myelomonocytic leukemia (CMML) is a slowly developing blood disorder where the bone marrow makes too many myelomonocytes, a type of white blood cell. This excess crowds out normal blood cells like red blood cells and platelets, which can cause tiredness, easy bruising, bleeding, and infections. It may also appear under related names such as Chronic Myelomonocytic Leukemia.

Cerebellar Mutism Syndrome (CMS) is a condition that can occur after surgery to remove a brain tumor, especially in the cerebellum. It usually begins one or two days after surgery and causes symptoms such as loss of speech, difficulty swallowing, balance and walking problems, muscle weakness, and mood or personality changes. Many symptoms improve over time with supportive care.

CMV, or cytomegalovirus, is a common virus that many healthy people carry without symptoms. It can stay inactive in the body for life. However, in people with weakened immune systems—such as those receiving bone marrow transplants or treatment for leukemia or lymphoma—CMV can cause serious lung infections like pneumonia. It may also appear under related names such as Cytomegalovirus.

Cnicin is a natural chemical found in plants like blessed thistle. It belongs to a group called sesquiterpene lactones and has been used traditionally for some health issues. Early research suggests it might have anti-inflammatory and anticancer effects, but these are not proven or part of standard cancer treatment. Always talk with your healthcare team before using products containing cnicin.

The CNS, or central nervous system, includes the brain and spinal cord. It controls many body functions and can be affected by some cancers. Understanding the CNS is important because cancer may spread to these areas, which can change treatment and care plans. It may also appear under related names such as Central Nervous System.

CNS depressants are medicines that slow down brain activity to help relax muscles and calm the mind. They are often used to treat trouble sleeping, anxiety, panic attacks, and seizures. Some may also be given before surgery to reduce anxiety. Common types include benzodiazepines, barbiturates, and certain sleep aids. These medicines can cause drowsiness and should be used carefully as directed by a healthcare provider.

CNS metastasis means cancer has spread from its original site to the central nervous system, which includes the brain and spinal cord. This can affect important body functions and may cause symptoms like headaches or changes in thinking. Understanding this term helps patients and caregivers follow their care plan and communicate clearly with their healthcare team.

CNS PNET, or Central Nervous System Primitive Neuroectodermal Tumor, is a rare cancer that starts in early nerve cells of the brain or spinal cord. It affects important parts of the central nervous system and usually requires specialized medical care. Knowing this term can help patients and caregivers better understand diagnosis and treatment discussions.

CNS prophylaxis is a preventive treatment to stop cancer cells from growing in the brain and spinal cord. It often involves chemotherapy injected directly into the fluid around these areas or high-dose chemotherapy given through a vein. Sometimes radiation therapy is also used. This approach helps lower the chance that certain blood cancers, like leukemia or lymphoma, will return in the central nervous system after initial treatment.

CNS stimulants are medicines that increase certain brain chemicals to help improve alertness, attention, energy, and physical activity. They can also raise blood pressure, heart rate, and breathing. These drugs are often used to treat conditions like depression, ADHD, and narcolepsy. In cancer care, they may sometimes be used to help manage fatigue or concentration problems, depending on individual needs and medical advice.

A CNS tumor is an abnormal growth of cells in the central nervous system, which includes the brain and spinal cord. These tumors can be different types, such as brain stem glioma, medulloblastoma, or meningioma. They may affect important brain and nerve functions and often require specialized care and treatment.

CNTO 328, also called siltuximab or Sylvant, is a medicine used to treat multicentric Castleman disease (MCD), a rare disorder causing enlarged lymph nodes and other symptoms. It works by blocking a protein called interleukin-6 (IL-6), which can cause inflammation and support abnormal cell growth. CNTO 328 is approved for patients without HIV or human herpesvirus 8 infections and is being studied for other cancers and conditions.

Co-culture is a lab method where two or more different types of cells are grown together. This helps researchers study how cells interact, which is important for understanding cancer and developing new treatments. Co-culture is a research tool and does not describe a patient’s condition or treatment directly. If you hear this term during your care, ask your healthcare team how it relates to your situation.

Co-Trimoxazole is an antibiotic medicine made from two drugs, sulfamethoxazole and trimethoprim. It is used to treat and prevent infections caused by certain bacteria and tiny organisms called protozoa. In cancer care, it helps protect people with weakened immune systems from infections that can happen during treatment. This entry helps connect the word with diagnoses, testing, treatments, supportive care, research notes, protocols, media, books, people, organizations, and safety concerns.

A coactivated T cell is a type of immune cell that has been specially treated with lab-made proteins called monoclonal antibodies. This treatment helps the T cell better recognize and attack cancer cells. It is one way doctors try to boost the immune system to fight tumors more effectively, often used in advanced cancer treatments or clinical trials.

Cobalamin, also called vitamin B12 or cyanocobalamin, is a water-soluble vitamin important for making red blood cells, DNA, and keeping nerves healthy. It is found mainly in animal foods like meat, eggs, and dairy. Your body needs small daily amounts. Low levels can cause anemia and nerve problems. Researchers are studying its role in cancer prevention and treatment.

Cobalt 60 is a radioactive form of the metal cobalt used as a source of radiation in cancer treatment. It produces gamma rays that help target and destroy cancer cells during radiation therapy. Patients may hear this term when discussing how radiation is delivered to treat their cancer. This entry helps connect the word with diagnoses, testing, treatments, supportive care, research notes, protocols, media, books, people, organizations, and safety concerns.

Cobimetinib fumarate (brand name Cotellic) is a targeted cancer drug used alone to treat certain rare blood disorders called histiocytic neoplasms. It is also used with another drug, vemurafenib, to treat melanoma that has spread or cannot be removed by surgery, especially when the melanoma has a specific BRAF gene mutation. It works by blocking proteins that help cancer cells grow and is being studied for other cancers.

The coccyx, or tailbone, is a small bone at the very bottom of the spine made of several fused bones. It anchors muscles and ligaments in the pelvic area. In cancer care, the coccyx may be mentioned when tumors or treatments involve the lower spine or pelvis. Knowing about the coccyx can help you understand your diagnosis, symptoms, and treatment options related to this area.

Cockayne syndrome is a rare inherited disorder caused by changes in genes that help repair DNA. It leads to slow growth, a small head size, early signs of aging, sensitivity to sunlight, and delays in learning and development. Other problems may include hearing and vision difficulties, tooth decay, and nervous system issues. Symptoms usually begin in infancy and worsen over time.

Cod liver oil is a supplement rich in fat-soluble vitamins A, D, E, and K. These vitamins support immune health, bone strength, and cell protection. They are stored in the body and mainly come from foods like fish, vegetables, and nuts. Cod liver oil is sometimes used in cancer care to help maintain nutrition but should only be taken under medical guidance.

Cod liver oil is a supplement rich in fat-soluble vitamins A, D, and K, plus omega-3 fats. These nutrients support vision, bone health, immune function, and blood clotting. While cod liver oil and fat-soluble vitamins can help correct deficiencies, they require careful use during cancer care, pregnancy, or if you take blood thinners. Too much vitamin A or D can be harmful, and cod liver oil may increase bleeding risk. Always talk with your healthcare team before starting these supplements.

Codeine phosphate is a medicine used to relieve mild to moderate pain, reduce coughing, and treat diarrhea. It comes from natural substances like opium or morphine and works by changing how the brain and nervous system sense pain, control coughing, and manage bowel movements. It may be part of a cancer pain management plan or used to ease symptoms caused by cancer or its treatments.

A codon is a group of three chemical units called nucleotides found in DNA or RNA. Each codon tells the cell which amino acid to add next when making a protein. Some codons signal the start or stop of protein production. Proteins are vital for many body functions, including cell growth and repair. Changes in codons can affect how cancer cells behave and respond to treatment.

Coenzyme Q10 (also called CoQ10 or ubiquinone) is a natural substance your body makes to help cells produce energy and protect themselves from damage. It acts as an antioxidant and is found in foods like fatty fish, beef, and soybeans. Some people with cancer take CoQ10 supplements to support heart health during chemotherapy or reduce side effects, but its benefits and safety are still being studied.

Coenzyme Q10 (also called Ubiquinone) is a natural antioxidant made by the body and available as a dietary supplement. It helps cells produce energy and may support heart health during chemotherapy. However, its benefits for treating cancer are not proven, and it can interact with some medications or treatments. Always talk with your healthcare team before using CoQ10 during cancer care.

A coffee enema is a procedure where brewed coffee is introduced into the colon through the anus. Some people explore this method as part of alternative health approaches, including cancer care. Coffee enemas are not proven cancer treatments and may carry risks. It’s important to discuss any interest in coffee enemas with your healthcare team to understand their safety and role in your care.

Coffee Enema-Supported Diets are nutrition plans that include coffee enemas, which some people use in hopes of supporting digestion, metabolism, immune health, or helping tolerate cancer treatments. These diets are not part of standard cancer care and lack strong scientific evidence for treating cancer. Patients should discuss their use with healthcare providers to understand safety and possible risks.

Coffee enemas are an alternative health practice where brewed coffee is introduced into the colon through the rectum. Sometimes used in detoxification regimens like the Gerson therapy, they are not proven cancer treatments and are not part of standard cancer care. Coffee enemas may carry risks and should be discussed with your healthcare team before use.

Coffee enemas and detoxification regimens are alternative methods some people use alongside cancer care to support digestion, relieve symptoms, or promote a feeling of cleansing. These practices are not part of standard cancer treatment and have not been proven to treat cancer. It’s important to discuss any such approaches with your healthcare team to ensure they are safe and do not interfere with your medical care.

The Children’s Oncology Group (COG) is a large network of hospitals and researchers supported by the National Cancer Institute. It focuses on clinical trials to find better ways to prevent, diagnose, and treat cancer in children and teens. COG also studies supportive care and survivorship to help young patients during and after cancer treatment.

Cognition means the mental processes involved in thinking, learning, remembering, being aware of your surroundings, and making decisions. In cancer care, it helps patients and caregivers understand how cancer or its treatments might affect these mental abilities. Changes in cognition can include trouble concentrating or memory problems, but not everyone experiences them. Knowing about cognition can help you talk with your care team about any mental changes during your cancer journey.

Cognitive Behavior Therapy (CBT) is a type of talk therapy that helps people change negative thoughts and feelings to improve how they cope and behave. It is often used during cancer care to support emotional health, helping with stress, anxiety, depression, and sleep problems by teaching new ways to manage difficult emotions and situations.

Cognitive impairment means having trouble with thinking skills like memory, learning, concentration, and decision-making. It can affect everyday tasks such as following instructions or solving problems. This condition can be mild or severe and may also influence mood and motivation. Cognitive impairment can happen for many reasons, including cancer and its treatments.

Cognitive therapy, also called cognitive behavior therapy (CBT), is a type of talk therapy that helps people change how they think and feel about situations. By shifting thoughts and feelings, it aims to improve behaviors and emotional well-being. It is often used to support patients coping with mental and emotional challenges, including those related to cancer.

Coherent or resonance breathing is a gentle, slow breathing method, usually about 5 to 6 breaths per minute, that helps reduce stress and promote relaxation. It may ease symptoms like anxiety, sleep problems, or pain during cancer treatment. This low-cost technique can be done at home or with support but is not a treatment for cancer itself.

A cohort is a group of people who share a common characteristic, such as the year they were born or when they were diagnosed. In cancer care, cohorts are groups of patients studied over time to learn about diseases, treatments, or outcomes. Understanding cohorts helps patients follow research and clinical trials related to their situation.

A cohort study is a type of research that follows groups of people who are alike in many ways but differ in one key characteristic, such as smoking. Researchers watch these groups over time to see how often a health outcome, like cancer, occurs. This helps identify possible links between behaviors or exposures and health risks.

Coinsurance is the percentage of a medical bill you pay after your health insurance covers its share. For example, if your plan pays 80%, you pay the remaining 20%. It applies to each health care service and helps share costs between you and your insurer. This entry helps connect the word with diagnoses, testing, treatments, supportive care, research notes, protocols, media, books, people, organizations, and safety concerns.

COL-3 is an experimental drug studied for cancer treatment. It works by blocking the growth of new blood vessels that tumors need to grow. COL-3 belongs to a group of drugs called matrix metalloproteinase inhibitors and antiangiogenesis agents, which may help slow or stop cancer growth. It is not yet a standard treatment but may be available in clinical trials.

The COL17A1 gene helps make a special type of collagen that keeps your skin layers strong and connected. Changes in this gene can cause fragile skin that blisters easily, a condition called junctional epidermolysis bullosa (JEB). People with JEB may also have a higher risk of developing a type of skin cancer called squamous cell skin cancer.

COL18A1, also called endostatin, is a protein made from collagen found in connective tissues. It is being studied as a cancer treatment because it may help stop tumors from growing new blood vessels, which tumors need to grow and spread. COL18A1 belongs to a group of treatments called antiangiogenesis agents that aim to block blood vessel growth.

The COL7A1 gene provides instructions for making type VII collagen, a protein that helps hold the layers of skin together. Mutations in this gene can cause fragile skin that blisters easily, leading to a rare inherited condition called dystrophic epidermolysis bullosa (DEB). People with DEB have an increased risk of developing certain skin cancers, including squamous cell carcinoma.

Colchicine is a medicine made from the autumn crocus plant. It is mainly used to treat gout, a painful joint condition caused by uric acid buildup. Colchicine works by slowing cell division and reducing inflammation by blocking certain immune cells from reaching swollen areas. It is not a cancer treatment but shares some properties with drugs used in cancer care.

Cold ischemia happens when tissue or an organ is cooled after its blood supply is stopped or reduced. This often occurs during surgery, either while the organ is still inside the body or after it has been removed, such as when preparing an organ for transplant. Cooling helps protect the tissue until blood flow can be restored or the organ is used.

Cold ischemia time is the period during surgery when an organ or tissue is kept cold after its blood supply is stopped and before blood flow is restored. This can happen while the organ is still inside the body or after removal, such as when preparing an organ for transplant. Cooling helps protect the tissue from damage caused by lack of blood and oxygen.

Cold knife cone biopsy, also called cold knife conization, is a surgical procedure that removes a cone-shaped piece of abnormal tissue from the cervix using a scalpel or laser. The tissue is examined under a microscope to check for signs of cervical cancer or precancerous changes. It can also help treat certain cervical conditions and is often done after abnormal cervical screening tests.

Cold knife conization is a procedure that removes a cone-shaped piece of tissue from the cervix using a scalpel or laser. This tissue is checked under a microscope to look for abnormal or precancerous cells. It is often done after abnormal cervical screening tests to help diagnose or treat early cervical changes and guide further care.

A cold nodule is a lump in the thyroid gland that absorbs less radioactive material than normal thyroid tissue during a scan. This means it does not produce thyroid hormone. Cold nodules can be benign (non-cancerous) or malignant (cancerous). Finding a cold nodule often leads to further tests to understand its nature and decide on the best care.

A cold tumor is a cancer that does not trigger a strong immune response. It is surrounded by cells that block immune cells called T cells from attacking it. Because of this, cold tumors often do not respond well to immunotherapy. Many breast, ovarian, prostate, pancreatic, and brain tumors are considered cold tumors.

A colectomy is surgery to remove all or part of the colon, which is the longest part of the large intestine. It can be done through one large cut in the abdomen (open colectomy) or several small cuts using a camera and special tools (laparoscopic-assisted colectomy). When only part of the colon is removed, it’s called a partial colectomy.

Chinese Weevils (Ulomoides dermestoides), also known as coleoptero terapia or gorgojo chino, are small beetles used in some traditional and alternative medicine practices. They contain natural chemicals studied for possible health effects. However, their use is not part of standard cancer treatment and may carry risks. Patients should discuss any interest in this therapy with their healthcare team.

Chinese Weevils (Ulomoides dermestoides) are small beetles used in a traditional folk therapy called coleopterotherapy, which involves swallowing live beetles. Though studied for their natural chemicals, these beetles are not part of standard cancer treatments. Their safety and effectiveness remain unproven, and using them may carry health risks. Patients should discuss any interest in such therapies with their healthcare team.

Coleoterapia is a traditional alternative therapy involving swallowing live Chinese weevils (Ulomoides dermestoides), small beetles used in some cultures for medicinal purposes. It is sometimes promoted for conditions like cancer or asthma but lacks strong scientific evidence for safety or effectiveness. Patients should discuss any interest in coleoterapia with their healthcare team before use.

Chinese Weevils (Ulomoides dermestoides), also called coleotherapy, are small beetles used in some traditional and alternative medicine practices. Some people believe they offer health benefits, including for cancer, but there is no strong scientific evidence supporting their safety or effectiveness. These beetles produce many natural chemicals that are being studied, but their use carries risks and is not part of standard cancer care.

Colitis is inflammation of the colon, the large intestine that stores and moves stool. It can cause symptoms like belly pain and diarrhea. In cancer care, colitis may be linked to certain diseases or treatments and needs careful management to ease symptoms and prevent problems. This entry helps connect the word with diagnoses, testing, treatments, supportive care, research notes, protocols, media, books, people, organizations, and safety concerns.

Collagen is a strong protein found in cartilage and other connective tissues like skin, bones, and organs. It helps give these tissues structure and support. In cancer care, collagen may be mentioned because it affects how tumors grow and how tissues heal after treatment, but it is a normal part of healthy tissue, not cancer itself.

Collagen disease is an older term once used for chronic illnesses affecting connective tissues like rheumatoid arthritis and lupus. Today, it more specifically refers to conditions caused by problems with collagen, a protein that supports skin, bones, and organs. Understanding this term can help patients know how connective tissue health might affect cancer treatment and healing.

Collagenase is an enzyme that breaks down collagen, a protein that gives strength and structure to tissues like skin and bones. In cancer care, collagenase plays a role in how tumors interact with surrounding tissues and how the body repairs tissue after treatment. Understanding collagenase can help patients learn more about tumor growth and healing processes.

The collarbone, also called the clavicle, is a long, thin bone at the front base of the neck. It connects the breastbone to the shoulder blades and helps support shoulder movement. It also protects important nerves and blood vessels that run from the neck to the arm. It may also appear under related names such as Clavicle.

The collecting duct, also called the renal collecting tubule, is the final part of a twisting tube in the kidney that collects urine from tiny filtering units called nephrons. It moves urine into larger channels that lead to the bladder. This structure helps the kidney process and drain urine and may be mentioned in kidney cancer care.

The collective patient perspective is the shared experience of many people with cancer. It helps researchers understand common challenges and needs across groups of patients. This view guides the design of clinical trials and treatments to better reflect what matters to many patients, not just one individual. This entry helps connect the word with diagnoses, testing, treatments, supportive care, research notes, protocols, media, books, people, organizations, and safety concerns.

Colloidal gold-bound tumor necrosis factor is an experimental cancer treatment that combines a protein called tumor necrosis factor (TNF) with tiny gold particles. This combination aims to kill cancer cells more precisely while reducing harm to healthy tissue. Also known as Aurimmune or TNF-bound colloidal gold, it is still being studied and is not yet a standard treatment.

Colloidal oatmeal is finely ground oatmeal used in skin creams, lotions, or bath powders to soothe and moisturize dry, itchy, or irritated skin. It helps protect and soften the skin, making it useful for rashes, burns, and skin irritation caused by cancer treatments like radiation. It is a gentle, natural ingredient that supports skin comfort but is not a medicine for skin diseases.

Colloidal Silver, also called Silver Hydrosol, is a liquid containing tiny silver particles. It has been studied for its antibacterial effects and potential to help fight certain infections. While not a standard cancer treatment, some research explores its role in managing infections that can affect people with weakened immune systems. Patients should discuss any use with their healthcare team to ensure safety.

Colloidal silver, also called silver hydrosol, is a liquid containing tiny silver particles. Some people use it hoping to prevent or treat cancer or support the immune system, but there is no reliable evidence it works for cancer. Taking colloidal silver by mouth or inside the body can cause serious side effects and is not recommended. Always talk with your healthcare team before using it.

Coloanal anastomosis is a surgery that connects the colon directly to the anus after the rectum is removed. Often used to treat rectal cancer or other diseases, this procedure helps patients pass stool normally without needing a permanent colostomy bag. It is also called coloanal pull-through. It may also appear under related names such as Coloanal Pull-Through.

Coloanal pull-through is a surgery that connects the colon directly to the anus after the rectum is removed. It is often done to treat rectal cancer or other diseases affecting the rectum. This procedure helps patients pass stool normally without needing a permanent colostomy bag, aiming to preserve bowel function and quality of life.

The colon is the longest part of the large intestine, connecting the small intestine to the rectum and anus. It absorbs water and some nutrients from food and turns leftover waste into stool, which is stored before leaving the body. The colon is important in digestive health and is often discussed in relation to colorectal cancer and screening tests.

Colon cancer is a disease where cells in the colon, the longest part of the large intestine, grow uncontrollably and form a tumor. Most colon cancers start as small growths called polyps, which can sometimes become cancerous over time. Early screening tests like colonoscopies can find and remove polyps before they turn into cancer, helping to prevent or catch colon cancer early.

A colon crypt, also called a gland of Lieberkuhn, is a small, tube-shaped gland in the lining of the colon and rectum. These glands produce new cells to renew the intestinal lining and make mucus that protects and lubricates the colon. Understanding colon crypts helps explain how the colon stays healthy and how changes in these glands might relate to cancer.

A colon polyp is an extra growth of tissue on the lining of the large intestine (colon). Most polyps are harmless, but some can develop into colon cancer over time. Doctors often find and remove polyps during a colonoscopy to help prevent cancer. This entry helps connect the word with diagnoses, testing, treatments, supportive care, research notes, protocols, media, books, people, organizations, and safety concerns.

Colonics, also called colon hydrotherapy, involve flushing the large intestine with water or other fluids through the rectum. Some people use colonics to cleanse the bowel or support detoxification. While sometimes mentioned in cancer care for symptom relief or wellness, colonics are not proven to treat or prevent cancer and should be used carefully with medical advice.

A colonoscope is a thin, flexible tube with a light and camera that doctors use to look inside the colon and rectum. It helps find problems like polyps or cancer and can remove tissue for testing. This tool is important for colorectal cancer screening and diagnosis. This entry helps connect the word with diagnoses, testing, treatments, supportive care, research notes, protocols, media, books, people, organizations, and safety concerns.

A colonoscopy is a medical test where a doctor uses a thin, flexible tube with a light and camera to look inside your colon and rectum. It helps find problems like polyps or cancer. During the test, the doctor can also remove tissue samples to check for disease. This entry helps connect the word with diagnoses, testing, treatments, supportive care, research notes, protocols, media, books, people, organizations, and safety concerns.

Colony-stimulating factors are substances that help the body make more blood cells, especially white blood cells. They are often used in cancer care to support the immune system when treatments like chemotherapy lower blood cell counts. Common types include G-CSF and GM-CSF, which encourage growth of different blood cells to help reduce infection risk.

Colorectal refers to the colon and rectum, parts of the large intestine. It is often used when talking about colorectal cancer, which starts in these areas. Understanding colorectal health helps with prevention, screening, and treatment of diseases affecting this part of the digestive system. This entry helps connect the word with diagnoses, testing, treatments, supportive care, research notes, protocols, media, books, people, organizations, and safety concerns.

A colorectal adenoma is a common type of polyp, or abnormal growth, that forms on the inner lining of the colon or rectum. These growths are made of gland-like tissue and can vary in size and shape. While not cancer, colorectal adenomas can sometimes develop into cancer if left untreated, so doctors often recommend removing them.

Colorectal cancer is a cancer that starts in the colon or rectum, parts of the large intestine. It often begins as small growths called polyps, which can sometimes turn into cancer over time. Screening tests like colonoscopies can find and remove polyps early to help prevent cancer. Early colorectal cancer may not cause symptoms, but signs can include changes in bowel habits or blood in the stool.

A colostomy is a surgically created opening in the colon that allows waste to leave the body through the abdomen. It is often needed when part of the colon is removed or needs time to heal. Waste passes through this opening into a special bag, helping the body manage digestion and waste safely when the normal route is not available.

Colostomy irrigation is a way for people with a colostomy to flush their colon with water through a tube inserted into the stoma. This helps empty the colon and pass stool into a colostomy bag. Doing this regularly can help patients better control bowel movements and manage their colostomy care more comfortably.

A colposcope is a special lighted magnifying tool used by healthcare providers to closely examine the cervix, vagina, and vulva. It helps find abnormal areas that may need further testing or treatment, especially after abnormal cervical cancer screening results like Pap or HPV tests. This entry helps connect the word with diagnoses, testing, treatments, supportive care, research notes, protocols, media, books, people, organizations, and safety concerns.

Colposcopy is a procedure that uses a special magnifying lighted instrument called a colposcope to closely examine the cervix, vagina, and vulva. A speculum is gently inserted to open the vagina for better viewing. Sometimes a mild vinegar solution is applied to highlight abnormal areas. It helps doctors find abnormal tissue that might lead to cancer or other health issues.

Columvi, also called glofitamab, is a medicine used to treat adults with certain types of large B-cell lymphoma that have returned or did not improve after at least two other treatments. It works by helping the immune system’s T cells find and kill lymphoma cells. Columvi is a type of immunotherapy that is also being studied for other cancers.

A coma is a deep state of unconsciousness where a person cannot be awakened or respond to their surroundings. It can happen due to injuries, illnesses, or complications from cancer or its treatment. People in a coma are alive but unable to move or communicate. The length and outcome of a coma depend on its cause and severity.

Combination antiretroviral therapy (cART), also called HAART, is a treatment for HIV that uses three or more medicines together. It helps stop HIV from making copies of itself, protecting the immune system and slowing the progression to AIDS. cART also lowers the chance of passing HIV to others, including from mother to baby during childbirth.

Combination chemotherapy is a cancer treatment that uses two or more anticancer drugs given together. This approach helps attack cancer cells in different ways and is often part of a treatment plan designed to improve the chances of controlling or shrinking cancer. Your healthcare team will explain how it fits your care and what to expect.

Combination therapy means using two or more types of cancer treatments together, such as surgery, chemotherapy, radiation, or targeted drugs. This approach aims to attack cancer in different ways to improve treatment results. It is also called multimodality therapy. Your care team may recommend combination therapy to better control cancer or reduce the chance it comes back.

Combined androgen blockade is a treatment for prostate cancer that lowers or blocks male hormones called androgens. It usually involves antiandrogen medicines together with surgery to remove the testicles or hormone drugs that reduce androgen production. This approach aims to slow cancer growth by cutting off the hormones cancer cells need.

Combretastatin A4 phosphate is an experimental drug being studied for cancer treatment. It works by reducing blood flow to tumors, which may help kill cancer cells. Derived from the African bush willow, it belongs to a group of drugs called tubulin-binding and vascular targeting agents. It is not yet a standard treatment but may be available in clinical trials.

Comedo carcinoma is a type of ductal carcinoma in situ (DCIS), an early, non-invasive breast cancer confined to the milk ducts. It is characterized by dead cells blocking the ducts, often detected by mammograms before symptoms appear. Understanding this term helps patients recognize their diagnosis as an early stage of breast cancer that requires careful treatment and follow-up.

Cometriq is a cancer medicine containing cabozantinib-s-malate, used mainly to treat medullary thyroid cancer that has spread. It works by blocking proteins that help cancer cells grow and by stopping new blood vessels from forming, which tumors need to grow. Cometriq is a targeted therapy and is also being studied for other cancers.

Comfort care, also called end-of-life care, is support for people with advanced cancer who have stopped treatments aimed at curing or controlling the disease. It focuses on relieving pain and other symptoms to help patients stay as comfortable as possible. Comfort care also provides emotional, social, and spiritual support for patients and their families during this difficult time.

The common bile duct is a small tube that carries bile, a digestive fluid made by the liver and stored in the gallbladder, into the small intestine. It passes through the pancreas and helps with digestion by delivering bile where it is needed. Problems with this duct can affect digestion and cause symptoms like jaundice or pain.

The common hepatic duct is a small tube that carries bile from the liver. It starts where the right and left hepatic ducts join outside the liver and ends where it meets a duct from the gallbladder to form the common bile duct. This duct is part of the biliary system, which helps with digestion by moving bile to the small intestine.

The common iliac artery is a pair of large blood vessels that carry oxygen-rich blood from the main artery in the abdomen to the lower body. Each artery splits to supply blood to the pelvis, reproductive organs, legs, and feet. These arteries are important for delivering blood to these areas and may be mentioned in cancer care when tumors or treatments are near them.

A Community Advisory Board (CAB) is a group of volunteers from the local community who work with cancer researchers. They help review clinical trials to make sure they respect community values and help explain research to patients and families. CABs act as a bridge between researchers and the community, making clinical trials easier to understand and more trustworthy.

Community immunity, also called herd immunity, happens when many people in a community are vaccinated against a contagious disease. This makes it harder for the disease to spread, helping protect those who cannot be vaccinated, such as newborns, pregnant women, or people with certain health conditions, including some cancer patients with weakened immune systems.

Comorbidity means having two or more health conditions at the same time. In cancer care, it refers to other illnesses a person may have alongside cancer. Knowing about comorbidities helps doctors plan treatments that consider your overall health. You might hear this term during doctor visits, in medical reports, or when discussing your care plan.

A companion diagnostic test is a special lab test that helps doctors find specific changes in a tumor, like gene mutations or biomarkers. These changes show if a certain cancer drug or treatment might work best for a patient. The test can also help predict side effects or show how well treatment is working, supporting more personalized cancer care.

Comparative anatomy is the study of how body parts of one animal or plant compare to those of another. In cancer care, it helps researchers understand how diseases develop and how treatments tested in animals might relate to human cancer. While it supports research, it does not describe a patient’s diagnosis or treatment directly.

Compassionate use, also called expanded access, is a way for patients with serious or life-threatening illnesses to receive investigational cancer treatments that are not yet fully approved and who cannot join clinical trials. It offers a possible option when no other approved treatments are available. It may also appear under related names such as Expanded Access.

Complement proteins are about 20 different proteins in the blood that help the immune system fight infections and other diseases. They work together to identify and remove harmful bacteria, viruses, and damaged cells. Complement proteins also support inflammation and attract immune cells to areas needing defense. They can be involved in cancer care as part of the body’s immune response but do not alone diagnose or predict cancer outcomes.

Complementary and Alternative Medicine (CAM) includes medical products and practices used alongside or instead of standard cancer treatments. Examples include acupuncture, herbal supplements, meditation, and massage. While some CAM therapies may help with side effects or stress, less is known about their safety and effectiveness compared to standard care. Always talk with your healthcare provider before trying CAM.

Complementary medicine includes treatments used alongside standard cancer care to help manage symptoms and improve well-being. These therapies, such as acupuncture, massage, meditation, and dietary supplements, are not part of standard medical treatment but may ease side effects like pain or nausea. While many people find them helpful, less scientific research supports their safety and effectiveness compared to conventional treatments.

Complementary therapy includes treatments used alongside standard cancer care to help manage symptoms and improve well-being. These therapies, such as acupuncture, massage, meditation, or dietary supplements, are not part of the main medical treatment. While some people find them helpful, most complementary therapies have less scientific research supporting their use compared to standard cancer treatments.

Complete androgen blockade is a treatment for prostate cancer that lowers or blocks male hormones called androgens. It combines medicines that block androgen effects with surgery or hormone drugs that reduce androgen production. This approach aims to slow or stop cancer growth by cutting off the hormones prostate cancer cells need.

A Complete Blood Count (CBC) is a common blood test that measures the numbers of red blood cells, white blood cells, and platelets. It also checks hemoglobin and hematocrit levels. Doctors use CBCs to help diagnose and monitor many health conditions, including infections, anemia, and blood cancers like leukemia. It may also appear under related names such as Blood Cell Count, CBC, And Full Blood Count.

Complete decongestive therapy (CDT) is a treatment program that helps manage lymphedema, a swelling caused by lymph fluid buildup, often after cancer treatment. It uses gentle massage, special compression bandages, exercises, and skin care to reduce swelling and improve movement in the affected arm or leg. This entry helps connect the word with diagnoses, testing, treatments, supportive care, research notes, protocols, media, books, people, organizations, and safety concerns.

A complete hysterectomy is surgery to remove the uterus and cervix. Sometimes, the ovaries and fallopian tubes are also removed. This surgery can be done through the vagina without abdominal cuts or through an incision in the abdomen. It is also called a simple or total hysterectomy and is often used to treat conditions affecting the uterus and cervix, including some cancers.

Complete metastasectomy is a surgery that removes all visible tumors that have spread from the original cancer to other parts of the body. It aims to take out all known cancer growths outside the primary tumor. This procedure may be part of a treatment plan to help control or reduce cancer in certain cases, but it does not guarantee that all cancer cells are gone.

Complete remission, also called complete response, means that after treatment, doctors cannot find any signs of cancer using available tests. It shows the cancer has responded well, but it does not always mean the cancer is cured. Regular follow-up is important to watch for any return of cancer. It may also appear under related names such as Complete Response.

Complete Response, also called Complete Remission, means that after cancer treatment, doctors cannot find any signs of cancer using current tests. It shows the cancer has responded well to therapy, but it does not always mean the cancer is cured. Regular follow-up is important to watch for any return of cancer.

A complex fibroadenoma is a noncancerous breast lump made of fibrous and glandular tissue, with extra changes like cysts or calcifications. It is more common in older women and may slightly increase the chance of breast cancer. Doctors often monitor it to keep track of breast health. This entry helps connect the word with diagnoses, testing, treatments, supportive care, research notes, protocols, media, books, people, organizations, and safety concerns.

A complex sclerosing lesion, also called a radial scar, is a noncancerous area of hardened breast tissue that looks like a scar under a microscope. These lesions often appear in both breasts and usually cannot be felt or cause symptoms. They may look like breast cancer on a mammogram, so a biopsy is often needed to be sure.

Compliance means following your medical plan correctly and consistently. This includes taking medicines as prescribed, following recommended diets, and keeping appointments. In cancer care, compliance helps ensure treatments work as intended and supports your health journey. This entry helps connect the word with diagnoses, testing, treatments, supportive care, research notes, protocols, media, books, people, organizations, and safety concerns.

A complication is a new medical problem that happens during an illness or after treatment. In cancer care, complications can be caused by the disease, its treatment, or other unrelated reasons. They may affect how a patient feels and might need extra care or changes in treatment. Complications can range from mild to serious but are often manageable.

Composite hemangioendothelioma is a rare tumor made of different types of blood vessel cells. It has both non-cancerous and cancerous features. These tumors usually appear on or under the skin of the arms or legs but can also form on the head, neck, or chest. They may spread to nearby lymph nodes but rarely spread to other parts of the body.

Composite lymphoma is a rare type of lymphoma where two or more different kinds of lymphoma cells are found at the same time. These cells may be in the same tissue or spread across different parts of the body. It can include both Hodgkin and non-Hodgkin lymphoma cells, making diagnosis and treatment more complex.

A compound is a substance made when two or more different elements join together through chemical bonds. Common examples include water (hydrogen and oxygen) and table salt (sodium and chloride). In cancer care, many medicines are compounds designed to work against cancer cells or support treatment, so understanding compounds can help explain how treatments work.

A compound nevus is a common type of mole made up of clusters of nevus cells found in both the outer and inner layers of the skin. These moles are usually harmless but knowing about them can help you notice any changes and talk clearly with your healthcare provider. This entry helps connect the word with diagnoses, testing, treatments, supportive care, research notes, protocols, media, books, people, organizations, and safety concerns.

A Comprehensive Cancer Center is a special cancer center recognized and supported by the National Cancer Institute (NCI). These centers combine expert patient care with cancer research, offering advanced treatments, clinical trials, and education for patients and healthcare providers. This entry helps connect the word with diagnoses, testing, treatments, supportive care, research notes, protocols, media, books, people, organizations, and safety concerns.

A Comprehensive Pediatric Cancer Center is a special cancer center supported by the National Cancer Institute (NCI). These centers focus on childhood cancers, combining research and expert care. Families may find access to advanced treatments, clinical trials, and specialized support tailored for children at these centers. This entry helps connect the word with diagnoses, testing, treatments, supportive care, research notes, protocols, media, books, people, organizations, and safety concerns.

Compression means pressing or squeezing one part of the body against another. In cancer care, it can describe a tumor pressing on nearby nerves or tissues, causing symptoms like pain or swelling. Compression also refers to gently flattening soft tissue, such as the breast during a mammogram, to get clearer x-ray images. Compression may also involve special bandages or garments used to reduce swelling after treatment.

A compression bandage is a special bandage that gently presses on a part of the body to reduce swelling, support injured tissues, or improve blood flow. In cancer care, it is often used to manage swelling caused by surgery, radiation, or lymphedema, which is fluid buildup in an arm or leg. Using compression bandages as directed helps support healing and comfort.

A compression fracture is a break in a bone where it collapses under pressure, most often in the spine. It commonly happens when bones are weakened by cancer or osteoporosis. This fracture can cause back pain, changes in posture, and difficulty moving. It’s important to understand compression fractures to manage pain and protect bone health during cancer care.

A compression garment is a tight, stretchy piece of clothing like a sleeve or stocking used to help manage swelling caused by lymph fluid buildup (lymphedema). It gently squeezes the skin to reduce swelling, improve blood flow, and support healing after cancer treatments. These garments come in different sizes and styles to fit various body parts and are often recommended during daily activities or exercise.

A compression pump is a device that helps improve blood and lymph flow in the arms or legs by gently pushing air through special sleeves wrapped around the limbs. It is often used to reduce swelling caused by fluid buildup, especially after cancer treatments that affect lymph nodes or vessels. This device supports circulation and comfort but does not treat cancer itself.

A compulsion is a strong, often uncontrollable urge to do or say something repeatedly, even without a clear reason. For example, a person might feel the need to wash their hands many times. In cancer care, recognizing compulsions can help patients and caregivers understand behaviors that may affect daily life and well-being.

Computational biology, also called bioinformatics, is a science that uses computers, math, and statistics to collect and analyze large amounts of biological and medical information. It helps organize data from genetic studies, patient records, tissue samples, and clinical trials to support research and care by making complex health data easier to understand.

Computed Tomographic Colonography, also called CT colonography or virtual colonoscopy, is a medical test that uses X-rays and a computer to create detailed 2-D and 3-D images of the inside of the colon. It helps doctors look for polyps or other changes that might lead to colorectal cancer without needing a traditional colonoscopy. The images can be saved and reviewed later if needed.

Computed Tomography Angiography (CTA) is a painless imaging test that uses x-rays and a special dye injected into a vein to create detailed pictures of blood vessels and blood flow. It helps doctors find problems like blockages, blood clots, or bulges in vessels. CTA is often used in cancer care to check blood vessels near tumors and to help plan treatments safely.

Computed Tomography Colonography, also called CT colonography or virtual colonoscopy, is a medical test that uses X-rays and a computer to create detailed 2-D and 3-D images of the inside of the colon. It helps doctors look for polyps or other changes that might need further checkup or treatment. The test is less invasive than a traditional colonoscopy and the images can be saved and reviewed later if needed.

A computed tomography (CT) scan is a painless imaging test that uses X-rays and a computer to take detailed 3-D pictures of the inside of your body. It helps doctors find tumors, plan treatments, and check how well treatments are working. Sometimes, a special dye is used to make certain areas clearer.

A computer-aided detection system (CAD system) is a computer program that helps doctors spot unusual areas on x-ray images. It highlights parts of the image that might need a closer look, such as during mammograms or chest x-rays. This tool supports doctors in finding signs of diseases like cancer earlier and more accurately.

A Computerized Axial Tomography (CT or CAT) scan is a painless imaging test that uses X-rays and a computer to create detailed 3-D pictures of the inside of your body. It helps doctors find tumors, plan treatments, and check how well treatments are working. Sometimes, a special dye is used to make certain areas clearer.

Computerized Tomography (CT), also called a CAT scan, is a painless imaging test that uses X-rays and a computer to create detailed 3-D pictures of the inside of your body. It helps doctors find tumors, plan treatments, and check how well treatments are working. Sometimes, a special dye is used to make certain areas clearer.

Concentration means how much of a substance, like salt or medicine, is present in a certain amount of body fluid or tissue. It helps doctors understand your health and how your body is responding to treatment. Changes in concentration can be normal or may need attention, depending on your situation.

Conception is the start of pregnancy when a sperm fertilizes an egg. It marks the beginning of a new life. In cancer care, understanding conception is important for patients concerned about fertility, pregnancy risks, or how treatments might affect future pregnancies. This entry helps connect the word with diagnoses, testing, treatments, supportive care, research notes, protocols, media, books, people, organizations, and safety concerns.

Concerta is a medication that stimulates the brain to help improve focus and attention. It is commonly used to treat attention deficit hyperactivity disorder (ADHD). In cancer care, Concerta is being studied to help improve thinking and memory problems that can happen after cancer treatments. It is also known as methylphenidate hydrochloride or Ritalin.

Concomitant means happening or existing at the same time as something else. In cancer care, it often refers to other health conditions or medications a person has alongside their cancer. Knowing about concomitant factors helps patients and caregivers understand how these may affect treatment choices and overall care. This entry helps connect the word with diagnoses, testing, treatments, supportive care, research notes, protocols, media, books, people, organizations, and safety concerns.

A concordant finding happens when two or more medical tests or exams give results that agree with each other. For example, if a doctor feels a lump, an imaging test shows something unusual, and a biopsy confirms cancer, these results are concordant. This agreement helps doctors feel more confident about a diagnosis and plan care.

Concurrent therapy means receiving two or more cancer treatments at the same time. For example, chemotherapy and radiation might be given together to help improve treatment results. This term describes how treatments are scheduled, helping patients understand their care plan and what to expect during therapy. This entry helps connect the word with diagnoses, testing, treatments, supportive care, research notes, protocols, media, books, people, organizations, and safety concerns.

A condition in medicine describes a person’s overall health status. It can mean how well or unwell someone is at a moment—like good, stable, or serious—or refer to a specific health situation such as a disease, injury, or even pregnancy. Knowing your condition helps guide your care and treatment decisions.

Conditionally reprogrammed cells (CRCs) are cells grown in a lab from a patient’s normal or cancer tissue. Treated to behave like stem cells, they can multiply quickly and be kept alive for a long time. CRCs help researchers study cancer and test treatments before they are used in patients, supporting personalized approaches to cancer care.

A conditioned response is when your body or feelings react to something because it reminds you of a past experience. For example, if you feel sick after chemotherapy in a clinic with a certain smell, you might start feeling sick whenever you smell that scent, even somewhere else. This is a natural way the brain learns from repeated experiences.

A conditioned stimulus is a signal or cue that, after being linked repeatedly with another event, can by itself trigger a reaction. In cancer care, this means a patient might start feeling symptoms or emotions when they encounter a certain sound, smell, or place associated with treatment, even before the treatment begins.

A conditioning regimen is the treatment given before a stem cell transplant to prepare the body. It usually includes chemotherapy, radiation, or antibody therapy to clear space in the bone marrow, reduce cancer cells, and help the body accept new stem cells. This step is important to improve the chances that the transplant will work well.

Condyloma acuminatum, also called genital warts, are small, raised growths on the genitals or around the anus caused by certain types of human papillomavirus (HPV). These warts usually cause no pain but can sometimes itch or bleed. HPV spreads through skin-to-skin contact, often during sexual activity with an infected partner. Treatment can remove warts, but they may return after treatment.

A cone biopsy, also called conization, is a procedure that removes a cone-shaped piece of tissue from the cervix. It is done to check for abnormal or precancerous cells and sometimes to treat them. Doctors use tools like a scalpel, laser, or a heated wire loop (LEEP) to remove the tissue, which is then examined under a microscope for signs of cervical cancer or other changes.

A confirmatory clinical trial is a research study that tests how well a new treatment works after early studies suggest it might help. These trials are important for cancer drugs given accelerated FDA approval, as they check the treatment’s benefits in a larger group. If the trial shows the treatment isn’t helpful, the FDA may remove it from the market.

Confusion means having trouble thinking clearly or understanding what is happening around you. It can happen for many reasons, including illness, medication side effects, or infections. In cancer care, noticing confusion is important because it may signal changes in health or the need for extra support to keep patients safe and comfortable.

Congenital means a condition or trait that is present at birth. It can come from inherited genes or other factors during pregnancy. In cancer care, knowing if something is congenital helps understand its origins and may affect treatment or monitoring decisions. This entry helps connect the word with diagnoses, testing, treatments, supportive care, research notes, protocols, media, books, people, organizations, and safety concerns.

Congenital fibrosarcoma, also called infantile fibrosarcoma, is a rare cancer that starts in fibrous connective tissue. It usually affects infants and young children and can sometimes be found before birth. These tumors often grow quickly and can become large, but they rarely spread to other parts of the body. It may also appear under related names such as Infantile Fibrosarcoma.

A congenital hemangioma is a non-cancerous blood vessel tumor present and fully formed at birth. It usually appears as a purple-red spot or lump on the skin, often on the head, neck, arms, or legs. Some congenital hemangiomas shrink or disappear on their own, while others may stay the same or partially fade over time.

Congenital hypoplastic anemia, also known as Diamond-Blackfan anemia, is a very rare inherited condition where the bone marrow makes too few red blood cells. It usually appears in babies under one year old. People with this condition may have physical differences like deformed thumbs and face a higher risk of certain cancers, including leukemia and bone cancer (osteosarcoma). Careful monitoring and treatment help manage symptoms and health risks.

Congenital mesoblastic nephroma is a rare kidney tumor found before birth or within the first three months of life. It develops from connective tissue cells in the kidney and is more common in boys. This tumor is usually less aggressive than other childhood kidney tumors but may sometimes spread to nearby tissues or the other kidney.

Congenital neutropenia is a rare inherited condition where the body makes too few neutrophils, a type of white blood cell that helps fight bacterial infections. Babies with this condition often have frequent infections and may have a higher risk of developing certain bone marrow problems or blood cancers like acute myelogenous leukemia (AML). It is also called Kostmann disease or genetic infantile agranulocytosis.

Congenital Pure Red Cell Aplasia is a very rare inherited condition where the bone marrow does not make enough red blood cells, usually noticed in babies under one year old. People with this condition may have physical differences like deformed thumbs and face a higher risk of certain cancers, including leukemia and bone cancer (osteosarcoma). Careful monitoring and treatment help manage symptoms and health risks.

Congestive heart failure is a condition where the heart muscle is too weak or stiff to pump blood effectively. This causes fluid to build up in the body, leading to swelling and breathing difficulties. It can affect one or both sides of the heart and may develop gradually or suddenly due to heart damage or other health problems.

Conization, also called cone biopsy, is a procedure that removes a cone-shaped piece of tissue from the cervix to check for abnormal or precancerous cells. It helps diagnose or treat early cervical changes and may use tools like a scalpel, laser, or a heated wire loop (LEEP). The removed tissue is examined under a microscope to guide care decisions.

A conjugate is a compound made by chemically linking two or more different substances. In cancer care, conjugates often combine a targeting molecule, like an antibody, with a drug to deliver treatment directly to cancer cells. This helps focus therapy on cancer while aiming to reduce side effects on healthy tissue. The exact meaning can vary, so it’s helpful to ask your care team how it applies to your treatment.

The conjunctiva is a thin, clear membrane that lines the inside of your eyelids and covers the white part of your eye. It helps keep your eye moist and protects it from dust, germs, and irritants. While usually healthy, the conjunctiva can become inflamed or infected, and in rare cases, it may be involved in certain eye cancers. Understanding this tissue can help you follow eye-related care and symptoms.

Conjunctivitis, often called pinkeye, is when the thin, clear layer covering the white part of the eye and the inside of the eyelids becomes red, swollen, or infected. It can cause discomfort, redness, and watery eyes. While usually mild, it’s important to recognize and manage, especially during cancer care when the immune system may be weaker.

Connecting peptide, or C-peptide, is a substance made by the pancreas when it produces insulin. It is released into the blood in equal amounts with insulin. Measuring C-peptide levels helps doctors understand how much insulin the body is making. Abnormal levels can be seen in conditions like diabetes or some cancers, but C-peptide alone does not diagnose these diseases.

Connective tissue is the body’s support system. It holds organs and tissues in place, protects them, and helps repair damage. Made of cells, fibers, and a gel-like substance, it includes bone, cartilage, fat, blood, and lymphatic tissue. Connective tissue also helps move nutrients and store fat, playing many important roles in the body.

Connexin genes make proteins that form tiny channels connecting nearby cells. These channels allow important substances like sodium and potassium to pass between cells, helping them grow and work properly. Changes in connexin genes have been found in some cancers and other health conditions, affecting how cells communicate and function.

Conscious sedation, also called moderate sedation, is a type of medicine that helps you feel relaxed and sleepy during certain medical procedures. You may be lightly asleep but can still wake up if spoken to or touched. Pain-relieving medicines are often given too, to make the procedure more comfortable and reduce anxiety.

A consecutive case series is a type of clinical study that includes every patient who meets the study’s criteria during a set time period. Patients are enrolled and treated in the order they are found. This kind of study usually does not include a comparison group and helps researchers observe outcomes in a real-world setting.

The Consensus Development Program is a National Institutes of Health effort that brings together independent experts to review scientific evidence on important health topics. The experts study research, hear from specialists and the public, then write a report summarizing what is known. This report helps inform the public but is not a treatment guideline.

A consent form is a written document that explains important details about a medical procedure, treatment, clinical trial, or genetic test. It describes possible risks and benefits. Signing the form means a person agrees to take part and gives official permission for the procedure or treatment to happen. This entry helps connect the word with diagnoses, testing, treatments, supportive care, research notes, protocols, media, books, people, organizations, and safety concerns.

The consent process, also called informed consent, is when your healthcare team gives you clear information about a medical procedure, treatment, genetic test, or clinical trial. This helps you understand the possible benefits and risks so you can decide if you want to proceed. You’ll also be updated if new information arises that might affect your choice to continue.

Consolidation therapy is treatment given after initial cancer therapy has made the cancer disappear. Its goal is to kill any remaining cancer cells that might still be in the body. This therapy can include radiation, stem cell transplants, or cancer-fighting drugs. It is also called intensification therapy or postremission therapy.

Constipation means having fewer bowel movements than usual, with stool that is hard, dry, and difficult or painful to pass. It can cause discomfort, bloating, and a sluggish feeling. Constipation is common during cancer treatment but can also be caused by other health issues. Drinking fluids, staying active, and talking with your doctor about safe treatments can help manage it.

Constitutional acupuncture, also called Korean acupuncture, is a type of acupuncture that customizes treatment based on a person’s unique constitution. It considers how your organs influence your health, appearance, thoughts, and how you respond to treatments. Rooted in traditional Oriental medicine, it aims to provide personalized care and may be used alongside cancer treatments to support well-being.

Constitutional DNA, also called germline DNA, is the genetic material inherited from a person’s parents through egg and sperm cells. It is the same in every cell of the body and carries inherited traits and risks, including those related to cancer. Understanding constitutional DNA helps guide genetic testing and family risk assessments.

A consultand is a person who is receiving genetic counseling. This means they meet with a genetic counselor to discuss their family health history and possible inherited risks for diseases like cancer. Being a consultand does not mean a person has cancer or a genetic mutation; it simply means they are exploring genetic information to help make informed health decisions.

Contiguous means touching or very close together. In cancer care, it describes how tumors or affected tissues are positioned next to each other. Knowing if cancer cells or growths are contiguous helps doctors understand how the disease is spreading and plan treatments like surgery or radiation. This entry helps connect the word with diagnoses, testing, treatments, supportive care, research notes, protocols, media, books, people, organizations, and safety concerns.

Contiguous lymphoma means lymphoma cancer is found in lymph nodes that are next to each other. This term describes how the cancer has spread within the lymphatic system. Knowing if lymphoma is contiguous helps doctors understand the disease’s extent and plan treatment, but it does not by itself show how aggressive the cancer is or the overall outlook.

A continent reservoir is a surgically made pouch from the small intestine that stores urine inside the body after the bladder is removed. It has a valve to prevent leaks, allowing the person to empty urine by inserting a catheter through a small opening on the abdomen. This option is often part of bladder cancer treatment and helps avoid the need for an external urine bag.

Contingency management is a treatment approach that encourages positive behavior changes by giving immediate rewards when patients meet specific goals. It is often used to help people overcome drug or alcohol problems and is being studied to support quitting smoking. The idea is that rewarding good behavior makes it more likely to continue, helping patients stay motivated and on track with their health goals.

Continuous Hyperthermic Peritoneal Perfusion (CHPP), also called HIPEC, is a cancer treatment given during surgery. It involves circulating a warm liquid with chemotherapy drugs inside the abdomen after surgeons remove visible tumors. The heat helps the drugs work better to kill leftover cancer cells on the lining of the abdomen, often used for cancers that have spread within the belly.

Continuous infusion is a way to give medicine or fluids slowly through a vein over many hours or days. This steady delivery helps keep a consistent amount of medicine in the body. It is often used in cancer treatment to give chemotherapy or other drugs safely and effectively, sometimes with a portable pump that lets patients move around during treatment.

Continuum of care means the full range of health care a person receives over time, from diagnosis through treatment, recovery, and sometimes end-of-life care. In cancer, it ensures that care is coordinated and continuous, helping patients and caregivers manage each step of the illness journey. This entry helps connect the word with diagnoses, testing, treatments, supportive care, research notes, protocols, media, books, people, organizations, and safety concerns.

Contraception, also called birth control, means using medicines, devices, or surgery to prevent pregnancy. Common methods include condoms, hormone-based pills or patches, intrauterine devices (IUDs), and surgeries like tubal ligation or vasectomy. Contraception helps people plan if and when to have children and is especially important during cancer care to avoid pregnancy and protect fertility.

A Contract Research Organization (CRO) is a company hired to help run parts of a clinical trial. CROs assist with designing, managing, monitoring, and analyzing studies that test new cancer treatments. They work behind the scenes to support research, helping ensure trials follow rules and run smoothly, but they do not provide direct medical care or make treatment decisions.

A contracture happens when muscles, tendons, skin, and nearby tissues become permanently tight and shortened. This causes joints to stiffen and limits normal movement, making it hard or impossible to move the affected joint fully. Contractures can develop after injury, scarring, nerve damage, or long periods of not using muscles. Some cancer treatments, like stem cell transplants, may also increase the risk of contractures.

A contraindication is a health reason that makes a certain treatment or procedure unsafe for a person. For example, if someone has a bleeding disorder, taking aspirin might be harmful because it can increase bleeding. Knowing about contraindications helps doctors choose the safest care options tailored to each person’s health.

Contralateral means relating to the opposite side of the body. In cancer care, it helps describe where a tumor, symptom, or treatment is located compared to the other side. Understanding this term can make medical reports and discussions clearer when talking about diagnosis, treatment, or follow-up. This entry helps connect the word with diagnoses, testing, treatments, supportive care, research notes, protocols, media, books, people, organizations, and safety concerns.

Contralateral prophylactic mastectomy (CPM) is surgery to remove the healthy breast when cancer is found in the other breast. It aims to lower the chance of developing breast cancer in the healthy breast, especially for people at very high risk, such as those with certain inherited gene changes. CPM is a major surgery with benefits and risks that should be carefully discussed with your healthcare team.

A contrast esophagram is a special X-ray test that shows pictures of the esophagus after a patient drinks a liquid containing barium sulfate. The barium coats the inside of the esophagus, making its shape and lining visible on the X-rays. This test helps doctors find problems like narrowing, blockages, or tumors in the esophagus.

Contrast material is a special dye or substance used during imaging tests like x-rays, CT scans, or MRI scans to help highlight organs, tissues, or abnormal areas inside the body. It can be given by mouth, injection, or enema to make these areas easier to see and help doctors find or monitor health problems.

The Contreras Oasis Diet is a nutrition plan sometimes mentioned in cancer care discussions. It focuses on supporting nutrition, metabolism, inflammation, digestion, immune health, and helping patients tolerate treatments. While it may be offered as part of supportive or alternative care, it is not a proven cancer cure and should be discussed carefully with healthcare providers before use.

A control animal is an animal in a research study that does not receive the treatment being tested. Comparing control animals with treated animals helps researchers understand how well a treatment works. For patients and caregivers, it’s important to ask your care team how this term relates to your situation rather than seeing it as a diagnosis or treatment advice.

A control group is a set of patients in a clinical trial who do not receive the new treatment being tested. Instead, they may get a standard treatment, a placebo, or no treatment. Comparing the control group to the group receiving the new treatment helps doctors understand if the new approach works better. For patients, it’s important to ask your care team how this applies to your situation rather than assuming it guides your treatment directly.

A controlled clinical trial is a medical study that compares a new treatment to a standard treatment, a placebo, or no treatment, using strict rules to ensure fair results. These trials help doctors learn if a treatment is safe and effective. Patients should understand that the term means a study setup, not a treatment recommendation, and should ask their care team how it relates to their care.

A controlled study is a type of medical research where one group receives the treatment being tested, and another group (the control group) does not. This comparison helps doctors understand if a treatment works better than no treatment or a placebo. For patients and caregivers, it’s important to ask how the study results apply to their own care rather than assuming the term alone means a specific diagnosis or treatment plan.

A controlled substance is a drug or chemical that the government regulates closely because it can be addictive or misused. Some controlled substances, like morphine or Valium, are used medically and require a prescription. Others, like heroin or LSD, have no accepted medical use and are illegal. If you see this term, ask your care team how it relates to your treatment or medications.

Conventional mammography, also called film mammography, is a breast imaging test that uses low-dose x-rays to take pictures of the inside of the breast. The images are stored on x-ray film. It helps check for breast cancer and other breast changes like lumps, cysts, or calcium deposits. This test is commonly used for breast cancer screening and diagnosis.

Conventional medicine, also called allopathic or Western medicine, is the common system where doctors and healthcare professionals treat illnesses using drugs, surgery, or radiation. It is the usual approach for diagnosing and treating cancer and many other diseases, based on scientific research and widely accepted medical practices. It may also appear under related names such as Allopathic Medicine, Biomedicine, Mainstream Medicine, Orthodox Medicine, And Western Medicine.

Conventional renal cell carcinoma, also called clear cell renal cell carcinoma (ccRCC), is the most common type of kidney cancer in adults. It starts in the cells lining tiny tubes in the kidney that filter blood. Under a microscope, these cancer cells look clear or pale. Symptoms may include blood in the urine or pain, but sometimes the cancer is found during imaging tests done for other reasons.

Conventional therapy, also called conventional treatment, refers to cancer treatments widely accepted and used by most healthcare professionals. Common examples include surgery, chemotherapy, and radiation therapy. These treatments are supported by scientific research and form the standard approach to cancer care. Understanding conventional therapy helps patients recognize the treatments recommended by doctors and distinguish them from alternative or complementary options.

Conventional treatment for cancer includes therapies widely accepted and used by most healthcare professionals, such as surgery, chemotherapy, and radiation therapy. Sometimes called conventional therapy, these treatments form the standard approach to cancer care. It’s important for patients and caregivers to understand the term in context and discuss with their care team how it applies to their specific situation.

A convulsion is a sudden, uncontrolled shaking of the body caused by rapid muscle contractions and relaxations. In cancer care, convulsions can happen if tumors affect the brain or as side effects of treatment. Doctors may prescribe anti-seizure medications to help manage these symptoms and improve safety and quality of life. If you see this term, ask your care team how it relates to your specific situation.

The Coombs test, also called the antiglobulin test, is a blood test that looks for antibodies attached to red blood cells or platelets. It helps doctors find immune reactions that may cause the body to destroy its own blood cells. This test is sometimes used in cancer care to understand or monitor blood problems related to cancer or its treatments.

A copay, or copayment, is the fixed amount you pay for each health care service when you have health insurance. This can include visits to the doctor, lab tests, prescription medicines, or hospital stays. The amount usually depends on the type of service. Even with Medicare, you may still have copays along with other costs like deductibles or premiums.

A copayment, or copay, is a fixed amount you pay for each health care service when you have health insurance. This can include doctor visits, lab tests, prescription medicines, or hospital stays. The amount usually depends on the type of service. Even with Medicare or other insurance, you may still have copays along with other costs like deductibles or premiums.

COPD, or chronic obstructive pulmonary disease, is a long-term lung condition that makes it hard to breathe. It usually develops from smoking or exposure to lung irritants. Symptoms include coughing, wheezing, and shortness of breath. While there is no cure, treatments can help manage symptoms and improve quality of life. If symptoms worsen or you have signs of infection, contact your health care provider.

COPDAC is a chemotherapy treatment often used with radiation therapy to treat certain types of childhood Hodgkin lymphoma, especially in boys. It combines four drugs—cyclophosphamide, vincristine sulfate (Oncovin), prednisone, and dacarbazine—that work together to fight cancer cells. If you see COPDAC mentioned in your care, ask your healthcare team how it applies to your or your child’s treatment plan.

COPDAC is a chemotherapy treatment combining four drugs—cyclophosphamide, vincristine sulfate (Oncovin), prednisone, and dacarbazine. It is often used with radiation therapy to treat certain types of Hodgkin lymphoma in children, especially boys. If you see COPDAC mentioned, ask your care team how it applies to your or your child’s treatment plan.

To cope means to adjust to new situations and manage problems, especially during cancer. Coping involves handling the emotional, physical, and lifestyle changes that cancer and its treatment can bring. People may use methods like acupuncture or other complementary therapies to help ease side effects and stress. Learning how to cope can help you feel more in control and supported through your cancer journey.

Copiktra, also known as duvelisib, is a medicine used to treat adults with certain blood cancers—chronic lymphocytic leukemia (CLL), small lymphocytic lymphoma (SLL), and follicular lymphoma—when other treatments have not worked. It works by blocking proteins that help cancer cells grow. Copiktra is taken by mouth and may cause side effects like infections, diarrhea, and inflammation. Patients should discuss risks and benefits with their doctor.

Coping skills are methods people use to handle stress, difficult emotions, and challenges related to cancer and its treatment. These skills can include relaxation techniques, changing negative thoughts, and learning new ways to respond to triggers. Building coping skills can help improve quality of life by managing side effects and emotional responses during and after cancer care.

A copolymer is a large molecule made by joining two or more different small molecules called monomers in a repeating pattern. Copolymers are used in many products, including some drug delivery systems. If you see the word copolymer in your medical information, it’s important to ask your care team what it means for your specific situation rather than assuming it refers to a diagnosis or treatment.

COPP is a chemotherapy treatment combining four drugs—cyclophosphamide, vincristine sulfate (Oncovin), procarbazine hydrochloride, and prednisone. It is used mainly to treat Hodgkin lymphoma and some non-Hodgkin lymphomas. Patients may see the term COPP or COPP regimen in medical reports or treatment plans. It’s important to ask your care team how this treatment applies to your specific situation.

COPP is a chemotherapy treatment combining four drugs—cyclophosphamide, vincristine sulfate (Oncovin), procarbazine hydrochloride, and prednisone. It is mainly used to treat Hodgkin lymphoma and some non-Hodgkin lymphomas. Patients may see the term COPP or COPP regimen in medical reports or treatment plans. It’s important to ask your care team how this treatment applies to your specific situation.

COPP-ABV is a chemotherapy treatment used mainly for children with Hodgkin lymphoma. It combines several drugs—cyclophosphamide, vincristine, procarbazine, prednisone, doxorubicin, bleomycin, and vinblastine—to attack cancer cells. Sometimes it is given along with radiation therapy. If you see this term in your medical records or discussions, ask your care team how it applies to your specific situation, as it is not a diagnosis or a guaranteed treatment plan.

COPP-ABV is a chemotherapy treatment mainly used for children with Hodgkin lymphoma, a cancer of the lymphatic system. It combines several chemotherapy drugs to attack cancer cells and may be given with radiation therapy. If you see this term in medical records or discussions, ask your care team how it applies to your or your child’s specific situation, as it is not a diagnosis or a guaranteed treatment plan.

Copper Cu 64-ATSM is a radioactive substance studied in PET scans to help detect certain tumors. It targets tissues with low oxygen levels, which can include some cancer cells. If you see this term in your medical records, it’s important to ask your care team what it means for your specific situation rather than assuming it is a diagnosis or treatment.

A Copper Restriction Diet is a nutrition approach discussed in cancer care that involves limiting copper intake. It is considered for its possible effects on nutrition, metabolism, inflammation, digestion, immune health, and how well patients tolerate treatment. While some people explore it as part of alternative cancer therapies, its safety and effectiveness should be carefully reviewed with healthcare providers.

Coenzyme Q10 (CoQ10) is a natural substance your body makes to help cells produce energy and protect themselves from damage. It acts as an antioxidant and is found in foods like fatty fish, beef, and soybeans. Some people with cancer take CoQ10 supplements to support heart health during chemotherapy or reduce side effects, but its benefits and safety are still being studied.

Cordectomy is a surgery that removes one or both vocal cords, often to treat laryngeal cancer. After a total cordectomy, most normal speaking sounds are lost, though whispering and some deep sounds may remain. The procedure permanently changes the voice, so patients and caregivers should discuss what it means for their individual situation with their care team.

Corderone, also known as Amiodarone Hydrochloride, is a medication used to treat certain abnormal heart rhythms that have not improved with other treatments. It helps the heart maintain a steady beat by affecting its electrical signals. While it is not a cancer treatment, it may be used during cancer care to manage heart rhythm problems that arise from cancer therapies or other health issues.

Cordotomy is a surgical procedure used mainly near the end of life to relieve severe pain that other treatments, including strong pain medicines, cannot control. It works by cutting specific nerves in the spinal cord that carry pain signals. Because it is invasive and irreversible, cordotomy is considered only when other pain relief options have been tried without success.

Cordycepin is a natural compound originally found in certain fungi, known for its potential effects on cancer cells such as lung, kidney, colon, and breast cancers. It belongs to a group of drugs called antitumor antibiotics. Patients should understand cordycepin as a term that may appear in research or treatment discussions and always ask their care team how it relates to their specific situation.

A core biopsy, also called a core needle biopsy, is a procedure where a doctor uses a wider needle to remove a small cylinder of tissue from the body. This tissue sample is then examined under a microscope to help diagnose or monitor diseases like cancer. It is less invasive than surgery and provides more tissue than a fine-needle biopsy, helping doctors understand what is happening in a specific area.

A core needle biopsy is a medical procedure where a doctor uses a wider needle to remove a small cylinder of tissue from the body. This tissue sample is examined under a microscope to help diagnose or monitor conditions like cancer. It is less invasive than surgery and provides more tissue than a fine-needle biopsy, helping doctors understand what is happening in a specific area.

Coreg, also known as carvedilol phosphate, is a medicine used to treat high blood pressure and certain heart problems. In cancer care, it may be used to help protect the heart from side effects caused by some cancer treatments. While it supports heart health, Coreg is not a cancer treatment itself. Patients might hear this name during discussions about managing heart health alongside cancer therapy.

Coriolus versicolor extract comes from a mushroom also called turkey tail. It is studied for its possible role in cancer care, where it may help support the immune system, slow tumor growth, and reduce side effects of chemotherapy or radiation. It is used as a dietary supplement and biological response modifier in some cultures alongside standard cancer treatments.

The cornea is the clear, front part of the eye that covers the colored iris and the pupil. It lets light enter the eye and helps focus vision. The cornea is important for seeing clearly and protecting the eye from damage. In cancer care, understanding the cornea can help patients follow their care plan and discuss eye-related symptoms or treatments with their care team.

Coronary artery bypass grafting (CABG), also called aortocoronary bypass, is a surgery that uses a healthy blood vessel from another part of the body to create a new path around a blocked artery to the heart. This helps restore blood flow and brings oxygen and nutrients to the heart muscle, improving heart function and reducing symptoms like chest pain.

Coronary artery disease (CAD), also called coronary heart disease, is a condition where the arteries that supply blood and oxygen to the heart become narrowed or blocked, usually due to plaque buildup. This can cause chest pain, shortness of breath, or heart attacks. Women may have different symptoms and are less likely to recognize them. Regular exercise and healthy habits can help lower the risk of CAD.

Coronary Heart Disease (also called CAD or Coronary Artery Disease) happens when the arteries that bring blood and oxygen to the heart become narrowed or blocked, usually due to plaque buildup. This can cause chest pain, shortness of breath, or heart attacks. Women may have different symptoms and are less likely to recognize them. Regular exercise and healthy habits can help lower the risk.

Coronaviruses are a large family of viruses that can infect people and animals, causing respiratory illnesses. Some coronaviruses cause mild symptoms like the common cold, while others, such as the virus that causes COVID-19, can lead to more serious lung infections. For people with cancer, understanding coronavirus means knowing how it might affect their health and treatment. Always talk with your care team about what coronavirus means for your individual situation.

Coronavirus Disease 19, also called COVID-19, is a highly contagious respiratory illness caused by the SARS-CoV-2 virus. It spreads mainly through droplets when an infected person coughs, sneezes, or talks. Symptoms can range from mild to severe and include fever, cough, and trouble breathing. People with cancer or weakened immune systems are at higher risk of serious illness from COVID-19.

The corpus cavernosum is one of two sponge-like tissues inside the penis that fill with blood to help create an erection. It forms most of the penis and works with nearby tissues to make the penis firm. Understanding this term can help patients and caregivers discuss sexual health and side effects of cancer treatments with their care team.

The corpus spongiosum is a column of spongy tissue that runs along the underside of the penis. It surrounds the urethra, the tube that carries urine and sperm out of the body. During an erection, it fills with some blood to keep the urethra open, allowing ejaculation. It also forms the glans, or head, of the penis. Understanding this term can help patients discuss sexual health and side effects of cancer treatments with their care team.

The corpus uteri is the main, central part of the uterus, often called the body of the uterus. It is an important area in women’s reproductive anatomy and is sometimes mentioned in cancer care when discussing uterine or endometrial cancers. Understanding this term can help patients better follow their diagnosis and treatment discussions.

Corticosteroids are hormones made by the adrenal glands or created in a lab. They are strong medicines used to treat inflammation, immune system problems, and some side effects of cancer or its treatment. Because corticosteroids can have side effects, it’s important to understand how they apply to your care and ask your healthcare team for guidance.

Corticotropin, also called ACTH or adrenocorticotropic hormone, is a hormone made by the pituitary gland. It signals the adrenal glands to release hormones that help the body respond to stress. In cancer care, doctors may check ACTH levels to understand hormone activity or monitor certain tumors. Seeing this term does not always mean there is a hormone problem or cancer.

Cortisol is a hormone made by the adrenal glands that helps your body respond to stress, manage blood sugar, and control inflammation. Some tumors can affect cortisol levels, causing symptoms or health issues. Understanding cortisol in context is important, so ask your care team how it relates to your health or treatment.

Cortisone is a natural steroid hormone made by the adrenal glands or in a lab. It helps reduce swelling and calm the immune system. In cancer care, cortisone is mainly used in critical care to support patients who develop serious infections like neutropenic sepsis during treatment. It is not a cancer treatment itself. Patients should always ask their care team how cortisone applies to their specific situation.

Corynebacterium granulosum is a type of bacterium that can cause skin conditions. Some substances from this bacterium may help stimulate the immune system to fight cancer. If you see this term in your care, it’s important to discuss with your healthcare team what it means for your specific situation. This entry helps connect the word with diagnoses, testing, treatments, supportive care, research notes, protocols, media, books, people, organizations, and safety concerns.

Cosibelimab, sold as Unloxcyt, is a monoclonal antibody drug used to treat adults with cutaneous squamous cell carcinoma, a type of skin cancer that has spread or cannot be cured with surgery or radiation. It works by blocking a protein called PD-L1, which may help the immune system attack cancer cells. Cosibelimab may also be studied for other cancers and can appear under related names, so it’s important to discuss its role with your care team.

Cosmegen, also known as actinomycin D or dactinomycin, is a chemotherapy drug made from a natural bacterium. It is used alone or with other medicines to treat certain cancers in adults and children, including Ewing sarcoma, rhabdomyosarcoma, Wilms tumor, gestational trophoblastic tumor, and some testicular cancers. It works by damaging cancer cells’ DNA to help stop their growth.

Cost sharing is when patients pay part of their health care costs that insurance doesn’t cover. This often includes deductibles, copayments, and coinsurance. In cancer care, where treatments and tests can be frequent and expensive, understanding cost sharing helps patients and caregivers plan for out-of-pocket expenses. It usually does not include monthly insurance premiums or costs for services not covered by insurance.

Costello syndrome is a rare genetic condition caused by changes in the HRAS gene. It affects growth, development, and body features, and increases the risk of certain tumors, including some cancers like rhabdomyosarcoma. People with this syndrome may have distinctive facial features, loose skin, heart problems, and learning delays. Diagnosis often involves genetic testing. If you see this term, ask your care team how it relates to your or your child’s health.

Cotellic (cobimetinib fumarate) is a targeted cancer drug used alone to treat certain rare blood disorders called histiocytic neoplasms. It is also combined with vemurafenib to treat melanoma that has spread or cannot be removed by surgery, especially when the melanoma has a specific BRAF gene mutation. Cotellic works by blocking proteins that help cancer cells grow.

Cotinine is a chemical made when the body breaks down nicotine, the addictive substance in tobacco. Measuring cotinine in blood, urine, or saliva helps show if someone has been exposed to tobacco smoke, including secondhand smoke. It stays in the body longer than nicotine and can be used to monitor tobacco use or quitting efforts. Always ask your care team what cotinine results mean for you personally.

The Cottage Cheese & Flax Oil Diet is a nutrition approach sometimes discussed in cancer care. It is mentioned for its potential effects on nutrition, metabolism, inflammation, digestion, immune health, and treatment tolerance. While some sources suggest it may support cancer prevention or treatment, it is important to review such diets carefully with healthcare providers to ensure safety and appropriateness alongside conventional cancer care.

Cottonseed meal toxin is a substance made from the seed of the cotton plant. It is being studied for its potential to stop the growth of cancer cells and possibly kill them. Researchers are also exploring its use as a male contraceptive. While not yet a standard cancer treatment, it is of interest in ongoing research.

Coumarin is a natural substance found in some plants and citrus fruits like grapefruit and limes. It is used to make certain medicines that help prevent blood clots and treat heart conditions. Coumarin and related compounds can affect how the body breaks down some drugs, including cancer treatments. Patients should always discuss with their care team how coumarin might affect their specific treatment.

Coumestans are natural plant compounds that act like estrogen in the body and may have anticancer effects. They are found in foods like split peas, beans, alfalfa, and clover sprouts. For patients and caregivers, it’s important to understand coumestans in context and discuss with the care team how they might relate to individual health or treatment, rather than seeing the term alone as a diagnosis or treatment advice.

Coumestrol is a natural plant compound that acts like estrogen, a hormone in the body. It belongs to a group called coumestans, found in foods like alfalfa, clover sprouts, and some beans. Coumestrol and related substances may have effects on cancer, but their role is not fully understood. Patients should discuss with their care team how coumestrol relates to their health or treatment.

Counseling is a process where a trained professional helps you cope with emotional or mental distress and personal challenges. In cancer care, counseling supports patients and caregivers by addressing feelings, stress, and lifestyle changes. It is not a treatment or diagnosis by itself but a helpful resource to understand and manage the impact of cancer on your life.

A counselor, also called a mental health counselor, is a trained professional who talks with patients and their families about emotional and personal issues. They help people cope with feelings, improve relationships, and make decisions. Counselors can also connect patients to helpful resources like support groups and community services. In cancer care, they support mental and emotional well-being alongside medical treatment.

A course of treatment is the full plan of care your medical team sets up to manage cancer or another illness. It usually includes several cycles of treatment—periods of therapy followed by rest—and can last for several months. You might also see it called a treatment course. Understanding this term helps you follow your care plan and ask questions about your treatment journey.

COVID-19 is a contagious respiratory illness caused by the SARS-CoV-2 virus. It spreads mainly through droplets when an infected person coughs, sneezes, or talks. Symptoms can range from mild to severe and include fever, cough, and trouble breathing. People with cancer or weakened immune systems may be at higher risk of serious illness. Vaccines and treatments are available to help protect and manage COVID-19.

Cowden Disease, also called Cowden Syndrome or Multiple Hamartoma Syndrome, is a rare inherited condition. It causes many benign (non-cancerous) growths called hamartomas to form in the body and raises the risk of certain cancers, including breast, thyroid, and others. Understanding this condition can help with early detection and management of related health issues.

Cowden Syndrome, also called Cowden Disease or Multiple Hamartoma Syndrome, is a rare inherited condition that causes many non-cancerous growths called hamartomas to form in the body. People with this syndrome have a higher risk of developing certain cancers, including breast, thyroid, uterine, and others. Early detection and regular monitoring can help manage health risks.

COX inhibitors, also called cyclooxygenase inhibitors, are a type of drug that reduce inflammation and pain. They belong to a group known as nonsteroidal anti-inflammatory drugs (NSAIDs). These medicines are commonly used for conditions causing pain or swelling and are being studied for their possible role in cancer prevention and treatment. If you see this term, it’s important to ask your care team how it relates to your specific situation.

COX-2, also called cyclooxygenase-2, is an enzyme in the body that helps produce substances causing inflammation and pain. Some tumors have high levels of COX-2, and blocking its activity may slow tumor growth. COX-2 is often mentioned in cancer care and research, but its meaning and role can vary, so it’s important to ask your healthcare team how it relates to your situation.

COX-2 inhibitors are a type of nonsteroidal anti-inflammatory drug (NSAID) that reduce pain and inflammation by blocking an enzyme called cyclooxygenase-2 (COX-2). They are being studied for their potential to prevent certain colon polyps and as part of cancer treatment research. If you see this term, ask your healthcare team how it relates to your care, as it is not a diagnosis or a treatment plan by itself.

Cozaar, also known as losartan potassium, is a medication used to treat high blood pressure. It works by blocking chemicals that cause blood vessels to narrow, helping to lower blood pressure. Patients may see this name in medical reports or treatment plans. It’s important to discuss with your care team how Cozaar relates to your specific health situation rather than assuming it is a cancer treatment or diagnosis.

CP, also called chlorambucil-prednisone or the CP regimen, is a chemotherapy treatment combining two drugs used mainly to treat chronic lymphocytic leukemia (CLL). It includes chlorambucil, a chemotherapy drug that targets cancer cells, and prednisone, a steroid that helps manage symptoms and side effects. The term CP may appear in medical records or treatment plans under related names, so it’s important to ask your care team how it applies to your specific situation.

The CP Regimen is a chemotherapy treatment combining two drugs, chlorambucil and prednisone, mainly used to treat chronic lymphocytic leukemia (CLL). Chlorambucil attacks cancer cells directly, while prednisone is a steroid that helps reduce inflammation and manage symptoms related to cancer and its treatment. This combination may be called chlorambucil-prednisone, CP, or CP regimen in medical records or treatment plans.

CP-358,774, also known as erlotinib hydrochloride, OSI-774, or Tarceva, is a targeted cancer drug. It is used alone to treat certain types of non-small cell lung cancer with specific gene changes and combined with gemcitabine to treat some pancreatic cancers. It works by blocking a protein that helps cancer cells grow.

CP-4055, also known as Elacyt or Elacytarabine, is a drug used to treat advanced acute myeloid leukemia (AML). It is a form of the chemotherapy drug cytarabine that may work in cases where leukemia is resistant to cytarabine. CP-4055 works by blocking cell division, which may help kill cancer cells. Patients should discuss with their care team how this drug fits into their treatment plan.

CP-547,632 is a substance being studied as a possible cancer treatment. It belongs to a group of drugs called VEGF receptor inhibitors and angiogenesis inhibitors, which work by affecting blood vessel growth in tumors. If you see this term, ask your care team how it relates to your specific situation rather than assuming it is a diagnosis or treatment plan.

CP-609,754 is a substance currently being studied as a possible treatment for cancer. It is not yet an approved drug or standard therapy. If you come across this term, it’s important to discuss with your care team what it means for your specific situation rather than assuming it is a diagnosis or treatment plan.

CP-724,714 is a drug being studied for cancer treatment. It belongs to a group of medicines called ErbB receptor tyrosine kinase inhibitors, which work by targeting specific proteins involved in cancer cell growth. Research is ongoing to understand its safety and effectiveness in different types of cancer. This entry helps connect the word with diagnoses, testing, treatments, supportive care, research notes, protocols, media, books, people, organizations, and safety concerns.

Chronic prostatitis/chronic pelvic pain syndrome (CP/CPPS) is a long-lasting condition causing pain or discomfort in the prostate area, pelvis, or lower back. It lasts more than three months and is not caused by infection or cancer. Symptoms may include burning during urination, frequent urination, and difficulty emptying the bladder. CP/CPPS can affect quality of life and sometimes raises prostate-specific antigen (PSA) levels checked during prostate cancer screening.

CP4071 is a substance currently being studied as a possible treatment for cancer. It is not yet an approved drug or standard therapy. If you see this term, it’s important to discuss with your healthcare team what it means for your specific situation rather than assuming it is a diagnosis or treatment plan.

CpG 7909, also known as PF-3512676 or Promune, is a substance being studied as a treatment for some types of cancer. It belongs to a group of drugs called biological response modifiers, which work by stimulating the immune system. CpG 7909 may appear under different names in medical reports or research, so it’s important to ask your care team how it relates to your specific situation.

Contralateral prophylactic mastectomy (CPM) is surgery to remove the healthy breast when cancer is found in the other breast. It aims to lower the chance of developing breast cancer in the healthy breast, especially for people at very high risk, such as those with certain inherited gene changes. CPM is a major surgery with benefits and risks that should be carefully discussed with your healthcare team.

Cardiopulmonary resuscitation (CPR) is an emergency procedure used to restart a person’s heartbeat and breathing if they stop. It involves pressing firmly and quickly on the chest to keep blood flowing and often includes giving breaths to help oxygen reach the lungs. CPR can be lifesaving in sudden medical emergencies, including some complications related to cancer or its treatment.

CPT 11, also known as Camptosar or irinotecan hydrochloride, is a chemotherapy drug used mainly to treat colorectal cancer that has spread to other parts of the body. It can be given alone or with other medicines, especially when cancer has returned or did not improve after earlier treatments. Understanding these names helps patients recognize one option in cancer care.

Chloroquinoxaline Sulfonamide (CQS) is an experimental drug being studied as a possible treatment for cancer. It belongs to a group of drugs called topoisomerase inhibitors, which work by blocking enzymes cancer cells need to copy their DNA and grow. CQS is not yet approved for regular use and is usually available only through clinical trials or research studies.

CRA-024781 is a substance being studied as a possible treatment for several types of cancer. It works by blocking enzymes that cancer cells need to divide and grow. This type of drug is called a histone deacetylase (HDAC) inhibitor. If you see this term, it’s important to talk with your care team about what it means for your specific situation.

A cramp is a sudden, painful tightening of a muscle, often in the legs or abdomen. In cancer care, cramps can happen if calcium levels drop too low due to the cancer or its treatment. If you experience cramps, it’s important to talk with your care team to understand what they mean for you and how to manage them safely.

Cranial nerves are twelve pairs of nerves that connect the brain to different parts of the head, neck, chest, and abdomen. They carry signals between the brain and the senses (like sight, hearing, and taste) and control muscles in the face, jaw, and other organs. In cancer care, these nerves may be mentioned when tumors affect areas near or involving them.

Craniopharyngioma is a rare, non-cancerous brain tumor that usually forms near the pituitary gland and hypothalamus. It grows slowly but can press on nearby brain areas, causing problems with vision, growth, and hormone production. Most often diagnosed in children and young adults, treatment may include surgery and radiation to control tumor growth and protect brain function.

A craniotomy is a type of brain surgery where a small piece of the skull is temporarily removed to access the brain. It is often done to remove brain tumors, take tissue samples, relieve pressure, or treat other brain conditions. After the surgery, the bone piece is usually put back in place. Understanding how a craniotomy applies to your specific situation is important, so ask your care team for details.

The cranium, also called the skull, is the set of bones that form the head and protect the brain. It includes the cranial bones around the brain and the facial bones that shape the face. The cranium plays an important role in protecting the brain and supporting facial structures. It may also appear under related names such as Skull.

Craving is a strong, urgent desire for a substance or activity, such as alcohol, nicotine, or drugs. In cancer care, understanding cravings—especially related to alcohol or tobacco—can help doctors plan treatments and support recovery. Patients and caregivers should ask their care team how cravings might affect their specific situation rather than assuming it means a diagnosis or treatment plan.

Conditionally reprogrammed cells (CRCs) are cells grown in a laboratory from a patient’s normal or cancer tissue. These cells can be kept alive and multiplied to help researchers study cancer and test new treatments. CRCs are mainly used in research and are not part of routine cancer diagnosis or treatment.

Creatine is a natural substance made by the body that helps store and provide energy, mainly in muscles and the brain. It is sometimes taken as a supplement to improve muscle strength or support energy needs. While creatine is generally safe for adults, its effects and safety during cancer treatment, pregnancy, or in children are less clear. Patients should always discuss creatine use with their care team to understand what it means for their individual health.

Creatinine is a waste product made by muscles and removed by the kidneys. In cancer care, measuring creatinine in blood or urine helps doctors check how well the kidneys are working, especially when treatments might affect them. Creatinine levels are one part of routine tests to monitor kidney health. It’s important to understand your creatinine results in context and talk with your care team about what they mean for you personally.

Crestor, also called rosuvastatin calcium, is a medication used to lower cholesterol and triglycerides in the blood. It helps reduce the risk of heart disease by blocking an enzyme involved in cholesterol production. Crestor is a type of statin drug and may be mentioned in medical reports or treatment plans under either name.

Crib Death, also known as Sudden Infant Death Syndrome (SIDS), is the sudden and unexpected death of a healthy baby younger than one year old, usually during sleep. The cause is unknown, and it often happens without warning. This term may appear in medical reports or discussions about infant health and safety.

Cribriform means "perforated" or "sieve-like" and can describe certain bone structures or patterns seen under a microscope. In cancer care, it often refers to a pattern in tumor tissue. The word alone is not a diagnosis or treatment plan. Patients should ask their care team what it means in their specific situation.

Crisis intervention is short-term counseling aimed at helping someone immediately during a difficult emotional event. It focuses on stabilizing feelings, understanding the situation, and encouraging healthy coping. It is not meant to solve the underlying problem but to support a person in distress and help restore their normal functioning or connect them to further help.

Crisnatol mesylate is an experimental anticancer drug studied mainly for solid tumors. It works by interfering with cancer cells’ DNA, which may slow tumor growth. Early clinical trials showed some tumor response but also side effects like nerve and blood-related toxicities. It can cross into the brain, making it a possible option for brain tumors, though more research is needed. Patients should discuss with their care team how this drug might relate to their treatment.

CRISPR-Cas9 is a laboratory tool that helps scientists change or “edit” specific parts of DNA inside cells. It uses a special RNA guide to direct an enzyme called Cas9 to cut DNA at a precise spot, allowing changes to be made. In cancer research, CRISPR-Cas9 helps scientists understand how cancer develops and may lead to new ways to diagnose and treat it. Patients should ask their care team how this term relates to their own care.

Crizotinib (brand name Xalkori) is a targeted cancer drug used to treat certain tumors that have specific genetic changes involving the ALK or ROS1 genes. It is approved for some types of non-small cell lung cancer, inflammatory myofibroblastic tumors, and systemic anaplastic large cell lymphoma in adults and children aged 1 year and older. Crizotinib works by blocking proteins that help cancer cells grow.

A CRO, or Contract Research Organization, is a company hired by another company or research center to help run parts of a clinical trial. They may design, manage, monitor the trial, and analyze results. For patients and caregivers, it’s important to understand that seeing “CRO” in a report or discussion is about research support, not a diagnosis or treatment advice.

Crohn disease, also called regional enteritis, is a long-lasting inflammation of the digestive tract, usually affecting the small intestine and colon. Symptoms can include fever, diarrhea, stomach cramps, vomiting, and weight loss. People with Crohn disease have a higher risk of developing colorectal and small intestine cancers. Understanding this condition can help with monitoring and care.

A cross-sectional study is a type of research that looks at a group of people at one specific point in time or over a short period. It collects information about health conditions or risk factors, such as cancer or smoking, to find patterns or associations. While useful for planning further research, these studies do not prove cause and effect. Patients should ask their care team how such study results relate to their own health.

Cross-talk is a process inside cells where the same signal is shared by two or more communication pathways. This helps cells respond to their environment in complex ways. For patients and caregivers, it’s important to understand this term in context and ask the care team how it relates to an individual’s diagnosis or treatment, rather than assuming it means a specific medical action or outcome.

A crossover study is a type of clinical trial where all participants receive the same treatments but in a different order. For example, one group might get Treatment A first, then Treatment B, while another group gets Treatment B first, then Treatment A. There is usually a break between treatments. This design helps compare treatments within the same person and can be useful for studying chronic conditions.

C-reactive protein (CRP) is a protein made by the liver when there is inflammation or tissue damage in the body. CRP levels are usually low in healthy people but can rise with infections, cancer, or other inflammatory conditions. It is not recommended as a routine test for heart disease in people without symptoms. If you see CRP mentioned in your care, ask your healthcare team what it means for you.

Castrate-Resistant Prostate Cancer (CRPC) is prostate cancer that keeps growing even when testosterone levels in the body are very low. Unlike early prostate cancers that respond to hormone-lowering treatments, CRPC no longer shrinks or stops growing with these therapies. This stage often requires different treatment approaches and careful discussion with your care team.

Cruciferous vegetables, also called Brassica vegetables, are a family of vegetables including broccoli, cabbage, kale, cauliflower, Brussels sprouts, and similar greens. They contain natural compounds that may support health and are often included in balanced diets during cancer care. While they are nutritious and may help protect cells, they are not a guaranteed way to prevent or treat cancer.

Cryoablation, also called cryosurgery or cryotherapy, is a treatment that uses extreme cold to freeze and destroy tumors or abnormal tissue. It can be used on skin tumors and certain tumors inside the body. A special instrument called a cryoprobe delivers the cold, often guided by imaging tests. Cryoablation may be combined with other cancer treatments and is being studied for various cancers.

Cryobanking, also called cryopreservation, is the process of cooling and storing cells, tissues, or organs at very low or freezing temperatures to preserve them for future use. This method helps save biological material that might be needed later, such as during cancer treatment or fertility preservation. Patients may see this term in medical reports or treatment discussions and should ask their care team how it applies to their situation.

Cryopreservation, also called cryobanking, is the process of freezing and storing cells, tissues, or organs at very low temperatures to keep them safe for future use. This method is often used in cancer care to preserve fertility or healthy cells before treatment. If you see this term in your medical information, ask your care team how it applies to your situation rather than assuming it is a diagnosis or treatment.

Cryosurgery, also called cryotherapy or cryoablation, is a treatment that uses extreme cold to freeze and destroy abnormal tissue, including some tumors on the skin and inside the body. It involves applying very cold liquids or a special instrument called a cryoprobe to target and kill cancer cells or precancerous growths.

Cryotherapy, also called cryosurgery or cryoablation, is a treatment that uses extreme cold to freeze and destroy cancer cells or abnormal tissue. It is often used for tumors on the skin and some tumors inside the body. This local treatment can be combined with other cancer therapies and is guided by imaging to target the tumor while protecting healthy tissue.

Cryptorchidism, also called undescended testicles, is a condition where one or both testicles do not move down into the scrotum before birth. It is a common birth difference in boys. This condition may increase the risk of testicular cancer and fertility problems later in life. Treatment often involves surgery to bring the testicle into the scrotum, usually during infancy.

CSF stands for cerebrospinal fluid, a clear fluid that surrounds the brain and spinal cord. In cancer care, a CSF shunt or diversion may be needed if a tumor or treatment causes fluid buildup that blocks normal flow. This helps relieve pressure but does not treat the cancer itself. CSF is also tested during procedures like lumbar punctures to check for cancer spread or other issues.

CSP, also called cystosarcoma phyllodes or phyllodes tumor, is a rare tumor that forms in the connective tissue of the breast. Most CSPs are benign (not cancer), but some can be malignant or borderline. They tend to grow quickly and become large but rarely spread to other parts of the body. Surgery is the usual treatment, though tumors can sometimes come back.

CSPC, also called androgen-dependent or hormone-sensitive prostate cancer, is a type of prostate cancer that needs male hormones called androgens, like testosterone, to grow. Treatments that lower or block these hormones often help control the cancer, especially in early stages. Understanding this term can help you follow your diagnosis and treatment options.

Cause-Specific Survival (CSS) measures the time from a cancer diagnosis or the start of treatment until death caused specifically by that cancer. It does not count deaths from other causes. CSS helps patients and doctors understand how the cancer itself affects survival, separate from other health issues. It may also appear under related names such as Cause-Specific Survival.

CT Angiography (CTA) is a painless imaging test that uses x-rays and a special dye injected into a vein to create detailed pictures of blood vessels and blood flow. It helps doctors find problems like blockages, blood clots, or bulges in vessels. CTA is often used in cancer care to check blood vessels near tumors and to help plan treatments safely.

CT Colonography, also called virtual colonoscopy, is a medical test that uses X-rays and a computer to create detailed 2-D and 3-D images of the inside of the colon. It helps doctors look for polyps or other changes that might lead to colorectal cancer without needing a traditional colonoscopy. The test is less invasive and usually does not require sedation.

A CT scan (also called CAT scan or computed tomography) is a painless imaging test that uses special x-ray equipment and a computer to create detailed cross-sectional pictures of the inside of your body. These images help doctors diagnose, treat, and monitor many conditions, including cancer, broken bones, blood clots, and lung or heart problems.

CT-2103, also known as Paclitaxel Poliglumex, Paclitaxel Polyglutamate, or Xyotax, is a form of the chemotherapy drug paclitaxel linked to a protein called poliglumex. This combination may help the drug target cancer cells more effectively and cause fewer side effects. It is being studied in clinical trials for cancers like breast, ovarian, and lung cancer but is not yet a standard treatment.

CT-2106, also called Polyglutamate Camptothecin, is a form of the anticancer drug camptothecin. It is designed to work as a DNA topoisomerase inhibitor and is being studied because it may cause fewer side effects and be more effective than regular camptothecin. Patients may see this term in medical reports or treatment discussions and should ask their care team what it means for their specific situation.

CT-2584 is a substance being studied as a possible treatment for cancer. It may work by stopping blood vessels from growing into tumors, which tumors need to grow. If you see this term, it’s important to ask your care team what it means for your specific situation rather than assuming it is a diagnosis or treatment plan.

CT-322, also called Angiocept or VEGFR-2 inhibitor CT-322, is an experimental drug studied for cancer treatment. It works by blocking a protein that helps tumors grow new blood vessels, which tumors need to survive and grow. CT-322 is not yet a standard treatment and is usually available only through clinical trials.

A CT-guided biopsy is a procedure that uses a special type of x-ray called a CT scan to help doctors find and take a small tissue sample from an area deep inside the body. This sample is then checked under a microscope to look for signs of disease. It is often done when a lump cannot be felt or is located in a hard-to-reach place. Patients should ask their care team how this test applies to their situation.

CT53518, also known as MLN518 or Tandutinib, is a substance being studied as a possible treatment for some types of cancer. It works by blocking enzymes that help cancer cells grow and may also stop tumors from developing new blood vessels they need to survive. This term may appear in medical reports or discussions, so it’s important to ask your care team how it relates to your specific situation.

CTA, or computed tomography angiography, is a medical imaging test that uses X-rays and a special dye to create detailed pictures of blood vessels and blood flow inside the body. It helps doctors check for problems like blockages or aneurysms. In cancer care, CTA may be part of tests to understand blood flow near tumors but is not a treatment by itself. Always ask your care team what CTA means for your specific situation.

A circulating tumor cell (CTC) is a cancer cell that has broken away from the original tumor and entered the bloodstream. These cells can travel through the blood and may form new tumors in other parts of the body. Doctors sometimes test for CTCs using a blood sample to learn more about the cancer and help guide treatment decisions.

The CTC1 gene makes a protein that helps protect the ends of chromosomes and supports DNA copying. Changes (mutations) in this gene can cause rare inherited conditions like dyskeratosis congenita, which affects the skin, nails, and mouth, and may increase risks for bone marrow problems, lung scarring, and some cancers. Understanding CTC1 gene changes can help families with a history of these conditions, but it is important to discuss what it means for each person with the care team.

Circulating tumor DNA (ctDNA) are tiny fragments of DNA released into the bloodstream when cancer cells die. A blood test can detect ctDNA to find genetic changes in the tumor. This helps doctors diagnose some cancers, plan treatment, monitor response, or check if cancer has returned. It is a less invasive way to learn about the tumor compared to traditional biopsies.

CTLA-4 is a protein found on certain immune cells called T cells. It helps keep the immune system from attacking healthy cells by acting like a brake. Some cancer treatments block CTLA-4 to help the immune system better attack cancer cells. Changes in CTLA-4 can also affect immune system balance and may be involved in some immune disorders.

CTX is a common abbreviation for cyclophosphamide, a chemotherapy drug used to treat many types of cancer, including certain leukemias, lymphomas, breast cancer, and others. It works by damaging cancer cells’ DNA to help stop their growth. CTX may also affect the immune system and is sometimes used in severe autoimmune diseases. Patients should always ask their care team how CTX applies to their specific treatment plan.

Cc stands for cubic centimeter, a unit used to measure volume in the metric system. It is the same as a milliliter (mL). You may see cc, cubic centimeter, or milliliter used interchangeably in medical reports, treatment plans, or medication instructions. Understanding this term helps you follow your care more easily and avoid confusion when different words are used for the same volume measurement.

Cubicin, also known as daptomycin, is an antibiotic used to treat certain bacterial skin and bloodstream infections in adults. It is being studied for use in cancer patients who develop fever and neutropenia, a condition where a type of white blood cell is abnormally low. Patients may see the name Cubicin or daptomycin in medical reports or discussions, so it’s important to ask your care team how it relates to your care.

Cultural competency in healthcare means understanding and respecting different cultural backgrounds to help ensure fair and effective care for all patients. It helps healthcare providers communicate better and offer care that fits each person’s cultural needs. Patients and caregivers should ask their care team how cultural competency applies to their own care.

In cancer care, a culture usually means a lab test that grows bacteria, fungi, or cells from a sample to find infections or study cells. It helps doctors identify germs causing infections or understand cells for diagnosis and research. Patients may hear about cultures when managing symptoms or infections during cancer treatment. Always ask your care team what a culture result means for your specific situation.

Cultured cells are human, animal, or plant cells grown in a laboratory under controlled conditions. They are used in medical research, to test new drugs, and sometimes to help diagnose infections. For patients, seeing the term "cultured cell" means it’s part of lab work or research, not a diagnosis or treatment by itself. Always ask your care team how it relates to your specific situation.

A cultured cell line is a group of cells of the same type that have been grown continuously in a laboratory setting. These cells can come from humans, animals, or plants and are used mainly for research purposes, such as testing new drugs or studying diseases. When you see this term, it’s important to ask your care team how it relates to your specific situation rather than assuming it refers directly to your diagnosis or treatment.

Culturelle is a live form of a helpful bacterium called Lactobacillus rhamnosus GG. It produces lactic acid and is often used to support digestion and normal bowel function. Culturelle may also help keep the digestive system healthy. It is sometimes studied for preventing infections in people receiving stem cell transplants. The name Culturelle and Lactobacillus rhamnosus GG refer to the same probiotic, so checking the exact wording in medical information can help avoid confusion.

Cumulative dose is the total amount of a drug or radiation a patient receives over time. This can include the combined radiation from multiple imaging tests or treatments. Understanding cumulative dose helps patients and caregivers discuss safety and treatment plans with their care team, but it is not a diagnosis or treatment by itself.

Cumulative exposure means the total amount of a harmful substance or radiation a person encounters over time. It can affect health by increasing the risk of certain diseases, including some cancers. For patients and caregivers, it’s important to understand this term in context and ask the care team how it relates to their individual situation rather than seeing it as a diagnosis or treatment advice.

Cumulative risk is the total chance that a person will develop a certain cancer or health event over a specific period, such as a lifetime. For example, a woman without known risk factors has about a 12-13% chance of getting breast cancer by age 90. It’s important to understand cumulative risk in context and discuss what it means for you with your care team.

CUP, or cancer of unknown primary origin, is a diagnosis when cancer cells are found in the body but doctors cannot find where the cancer first started. It means the primary tumor site is unknown. This term may appear in medical reports, and it’s important to discuss with your care team what it means for your specific situation rather than assuming a treatment plan based on the term alone.

Cupping is a traditional Chinese medicine practice where warmed glass cups create suction on the skin. It has been used in China since the 1950s and is sometimes explored by cancer patients to help manage symptoms. However, scientific evidence does not support health benefits from cupping, and it carries a small risk of burns. It is considered a complementary therapy, not a cancer treatment.

Curative surgery is a type of surgery aimed at removing all cancerous tissue to cure the disease. It often involves taking out part or all of the affected organ, nearby healthy tissue, and sometimes nearby lymph nodes. This surgery works best when the cancer is localized, meaning it has not spread far. Chemotherapy or radiation may be used before or after surgery to help shrink the tumor or kill remaining cancer cells.

Curative therapy is treatment aimed at curing cancer, with the goal of full recovery and a good quality of life. Whether a treatment is considered curative depends on the type and stage of cancer. Patients and caregivers should discuss with their care team what curative therapy means for their specific situation, rather than assuming it applies the same way to everyone.

Curcumin is a natural substance found in turmeric, a yellow spice from an East Indian plant. It is studied for its possible effects on inflammation and side effects related to cancer treatment, such as radiation skin irritation and mouth sores. While some small studies suggest benefits, evidence is mixed, and curcumin is not an approved cancer treatment. Patients should discuss its use with their healthcare team.

A Curcumin-Focused Diet is a nutrition approach that emphasizes curcumin, a compound found in turmeric, and is discussed in cancer care for its potential effects on nutrition, inflammation, digestion, immune support, and treatment tolerance. It is important to understand this diet in context and consult your healthcare team before making changes, as it is not a proven cancer treatment but may be part of supportive care or alternative approaches.

A cure means a treatment that heals or restores health by removing or stopping cancer so it does not come back. Sometimes surgery, medicines, or therapies can cure cancer if it is found early and has not spread. In other cases, treatment may control symptoms or improve quality of life even if a cure is not possible. It’s important to understand what cure means in your specific situation.

Curettage is a medical procedure that uses a small, spoon-shaped instrument called a curette to scrape and remove tissue from the lining of the uterus or other areas. It is often used to diagnose or treat conditions like abnormal uterine bleeding, benign growths, or to clear tissue after miscarriage. Curettage may be part of a procedure called dilation and curettage (D&C), where the cervix is gently opened before tissue removal.

A curette is a small, spoon-shaped surgical tool with a sharp edge used to scrape tissue from the body. It is often used to collect tissue samples for testing or to remove abnormal or excess tissue. Curettes are commonly used in procedures involving the uterus, such as dilation and curettage (D&C), and can help diagnose or treat conditions like abnormal bleeding or benign growths.

Cushing disease is a condition where a benign tumor in the pituitary gland causes the body to produce too much of a hormone called ACTH. This leads to excess cortisol, a hormone made by the adrenal glands. Symptoms can include a round face, thin arms and legs, muscle weakness, high blood pressure, high blood sugar, purple or pink stretch marks, and weight gain, especially around the belly. It is important to discuss how this applies personally with your care team.

Cushing syndrome, also called hypercortisolism, is a condition where the body has too much cortisol, a hormone made by the adrenal glands. It can happen from taking steroid medicines or from certain tumors that cause excess cortisol. Symptoms often include weight gain around the belly and face, muscle weakness, high blood pressure, mood changes, and skin changes like stretch marks.

Custirsen Sodium, also called OGX-011, is a substance being studied as a possible treatment for cancer. It works by blocking a protein called clusterin, which helps cancer cells survive and resist treatment. Custirsen Sodium may make cancer cells more sensitive to chemotherapy. Patients should discuss with their care team how this term relates to their own care.

A cut point is a specific value in a medical test result that helps doctors decide if a condition like obesity, diabetes, or high cholesterol may be present or if a patient is at risk. For patients and caregivers, it’s important to understand that a cut point is just one part of the overall health picture and should be discussed with the care team to see what it means for each individual.

Cutaneous means "of the skin." It is used to describe anything related to the skin, such as skin tumors, infections, or cancer that involves the skin. For example, cutaneous leiomyoma is a non-cancerous tumor in the muscle around hair follicles, and cutaneous breast cancer means breast cancer that has spread to the skin. Understanding the term in context is important for patients and caregivers.

Cutaneous breast cancer means breast cancer that has spread to the skin. The word "cutaneous" simply means "of the skin." If you see this term in your medical records or hear it from your care team, it’s important to ask how it applies to your specific situation. It is not a diagnosis or treatment by itself but describes where the cancer is located.

Cutaneous HPV (cutaneous human papillomavirus) is a group of common viruses that infect the skin’s surface, causing skin warts usually on the hands and feet. These infections spread through casual skin-to-skin contact or by sharing items like towels. Cutaneous HPV does not cause genital warts or cancer. If you see this term in your medical information, ask your care team how it relates to your situation rather than assuming it is a diagnosis or treatment.

Cutaneous human papillomaviruses (HPV) are a group of common viruses that infect the skin’s surface, causing skin warts usually on the hands and feet. Unlike other HPV types, cutaneous HPV does not cause genital warts or cancer. These infections spread through casual skin contact or sharing personal items. If you see this term in your medical information, ask your care team how it relates to your situation.

Cutaneous leiomyoma is a non-cancerous (benign) tumor that grows in the muscle tissue around hair follicles on the skin. These small bumps can be the same color or darker than nearby skin and often appear on the arms, legs, chest, or abdomen. They may grow larger or increase in number over time and can sometimes cause pain, especially when touched or exposed to cold. They are sometimes linked to an inherited condition called hereditary leiomyomatosis and renal cell cancer.

Cutaneous lichen amyloidosis is a skin condition that causes itchy, reddish-brown, scaly bumps. These bumps often appear on the shins and can thicken into hard patches over time. The exact cause is usually unknown. It is more common in middle-aged adults, especially men and people with darker skin. Sometimes, it is linked to rare genetic conditions.

Cutaneous squamous cell carcinoma is a type of skin cancer that starts in the outer layer of the skin. It often appears as a red bump, scaly patch, open sore, or wart that may crust or bleed. This cancer usually develops on sun-exposed areas like the face, ears, or hands. When caught early and hasn’t spread, it can often be cured with surgery or radiation.

Cutaneous T-cell lymphoma (CTCL) is a rare type of cancer that starts in certain white blood cells called T cells and mainly affects the skin. It often causes itchy, red, scaly rashes that can thicken or form tumors. CTCL usually grows slowly but can sometimes spread to lymph nodes or other organs. Treatments vary and may include skin-directed therapies, chemotherapy, or newer medicines when other options don’t work well.

A cerebrovascular accident (CVA), also called a stroke, happens when blood flow to part of the brain is blocked or a blood vessel breaks. This sudden event can damage brain tissue and cause symptoms like weakness, numbness, dizziness, or trouble speaking. In cancer care, some treatments and health conditions may increase stroke risk, so it’s important to know the signs and talk with your healthcare team about prevention and management.

CVP is a chemotherapy combination used to treat certain slow-growing blood cancers, including non-Hodgkin lymphoma (NHL) and chronic lymphocytic leukemia (CLL). It includes three drugs: cyclophosphamide, vincristine sulfate, and prednisone. Patients may see the term CVP or CVP regimen in medical reports or treatment plans. It’s important to discuss with your care team how this treatment applies to your specific situation.

CVP Regimen, also called CVP, is a chemotherapy treatment combining three drugs—cyclophosphamide, vincristine sulfate, and prednisone. It is mainly used to treat slow-growing blood cancers like certain types of non-Hodgkin lymphoma (NHL) and chronic lymphocytic leukemia (CLL). Patients may see this term in medical reports or treatment plans and should ask their care team how it applies to their specific situation.

CWC Labs Clean Food and Contaminant Testing is a program that analyzes foods, supplements, water, and soils for contaminants like heavy metals, pesticides, and microbes. In cancer care, it may be discussed for reasons such as nutrition support, symptom relief, or patient interest in complementary approaches. It is not a treatment but a testing service that some people explore to better understand what they consume during cancer treatment.

Cyanocobalamin, also known as vitamin B12 or cobalamin, is a water-soluble vitamin important for making red blood cells, DNA, and keeping nerves healthy. It is found mainly in animal foods like meat, eggs, and dairy. Your body needs small daily amounts, and low levels can cause anemia and nerve problems. It is sometimes studied in cancer prevention and treatment.

Cyanogenic glucosides are natural plant compounds that contain sugar and can release cyanide, a toxic substance. These compounds are found in certain foods and plants. Understanding cyanogenic glucosides can be important in cancer care, especially when discussing diet, herbal products, or plant-based substances that might affect health or treatment safety.

Cyanosis is a bluish or purplish color of the skin and mucous membranes caused by low oxygen levels in the blood. It often shows up in areas with thin skin, like lips, nail beds, and earlobes. Cyanosis is a sign that the body isn’t getting enough oxygen and can be linked to heart or lung problems. If you notice this color change, it’s important to talk with your healthcare team to understand what it means for you or your loved.

CYC116 is an experimental drug being studied in early clinical trials for treating some solid tumors. It works by blocking enzymes that help cancer cells divide and by stopping the growth of new blood vessels tumors need. It is not yet an approved treatment, so patients should discuss with their care team what it means for their specific situation.

A cycle of treatment is a set period when cancer treatment is given, followed by a planned break without treatment. This pattern repeats regularly. For example, a patient might receive treatment for one week, then rest for three weeks. Repeating these cycles forms the full course of treatment. The term may also be called treatment cycle, so it’s helpful to check how it’s used in your care documents.

The Cyclic Ketogenic Diet is a nutrition plan that cycles between low-carbohydrate, high-fat eating and periods of higher carbohydrate intake. It is discussed in cancer care for its potential effects on nutrition, metabolism, inflammation, digestion, immune health, and treatment tolerance. Patients should consult their healthcare team before trying this diet, as its safety and benefits vary depending on individual cancer type, treatment, and health status.

Cyclic neutropenia, also called periodic neutropenia, is a long-term condition where the number of neutrophils—a type of white blood cell—goes up and down in regular cycles. When neutrophil levels drop, people may have symptoms like fever, mouth sores, and infections. Understanding this term in context and talking with your care team is important for managing health.

Cyclin-D1 is a protein that helps control cell division. It is found in higher amounts in some cancer cells. Measuring cyclin-D1 levels in blood or tissue may help doctors diagnose certain cancers or plan treatment. For patients and caregivers, it’s important to understand cyclin-D1 in context and ask the care team how it relates to their specific situation rather than seeing it as a diagnosis or treatment on its own.

Cyclooxygenase inhibitors, also called COX inhibitors, are medicines that reduce inflammation and pain. They belong to a group of drugs known as nonsteroidal anti-inflammatory drugs (NSAIDs), which include familiar medicines like aspirin and ibuprofen. These drugs are sometimes mentioned in cancer care because researchers are studying their possible role in preventing or treating cancer. Always ask your care team how this term relates to your specific situation.

Cyclooxygenase-2 (COX-2) is an enzyme in the body that helps produce substances causing inflammation and pain. Some tumors have higher levels of COX-2, and blocking its activity may slow tumor growth. COX-2 is often mentioned in cancer care and research, but its meaning can vary. It’s important to ask your healthcare team how it relates to your situation rather than assuming it is a diagnosis or treatment plan.

Cyclooxygenase-2 inhibitors (COX-2 inhibitors) are a type of medicine that reduce pain and inflammation by blocking an enzyme called COX-2. They are being studied for their possible role in preventing certain colon polyps and as part of cancer treatment research. If you see this term, ask your healthcare team how it relates to your care, as it is not a diagnosis or treatment plan by itself.

Cyclophosphamide (also called CTX) is a chemotherapy drug used with other medicines to treat many cancers, including lymphomas, breast cancer, leukemia, and some brain tumors. It works by damaging cancer cells’ DNA to stop their growth. Cyclophosphamide can also lower the immune system’s activity and is sometimes used for severe autoimmune diseases. It may cause side effects like lowered blood counts, infertility, and bladder irritation.

Cyclosporine (also spelled ciclosporin) is a medication that lowers the immune system’s activity. It is often used to help prevent the body from rejecting organ or bone marrow transplants. It may also be used in some cancer clinical trials and other conditions. Because it affects the immune system, it can cause side effects like increased infections and high blood pressure. Always ask your care team how cyclosporine relates to your specific care.

The CYLD gene is a gene that helps control how cells grow and divide. Changes (mutations) in this gene can cause multiple skin tumors to develop, often in an inherited condition called Brooke-Spiegler syndrome. CYLD gene mutations are also linked to some cancers. If you hear this term, it’s important to ask your care team what it means for your health and treatment.

Cymbalta, also known as duloxetine hydrochloride, is a medication used to treat depression, anxiety, nerve pain, fibromyalgia, and some chronic pain conditions. It works by increasing certain brain chemicals that help improve mood and reduce pain. Cymbalta may cause side effects like nausea, dry mouth, dizziness, and sometimes sexual problems. It is important to discuss its use and possible risks with your healthcare provider.

Cyproheptadine is a type of antihistamine medicine often used to treat allergies, asthma, and itching. It can also help increase appetite and weight gain. In cancer care, it may be studied or used to help manage weight loss caused by cancer or its treatments. Always talk with your healthcare team about how cyproheptadine might apply to your specific situation.

Cyproterone acetate (CPA) is a medication that blocks male hormones and acts like a female hormone. It is used to treat conditions caused by male hormones, such as acne, excessive hair growth, early puberty, and prostate cancer. CPA is also part of hormone therapy for transgender women and is found in some birth control pills. It is taken by mouth and may have side effects, especially at higher doses.

Cyramza (ramucirumab) is a targeted cancer drug that blocks a protein called VEGFR-2. By doing this, it helps stop tumors from growing new blood vessels they need to survive and grow. It is used alone or with other treatments for certain lung, liver, colorectal, and stomach cancers. You might see it called Cyramza, ramucirumab, or IMC-1121B in your medical information.

A cyst is a closed sac-like pocket of tissue that can form anywhere in the body. It is usually filled with fluid, air, or other material and is most often benign (not cancer). Cysts can appear in many places, such as the ovaries, breasts, or wrist. Finding a cyst often leads to further tests to understand its size, location, and whether it needs treatment.

Cystectomy is surgery to remove all or part of the bladder, often used to treat bladder cancer. Partial cystectomy removes only the affected part of the bladder when the tumor is limited, while radical cystectomy removes the entire bladder and nearby tissues. Understanding this term helps patients discuss treatment options and what surgery might mean for their care.

The cystic duct is a small tube that connects the gallbladder to the bile duct system. It carries bile, a digestive fluid made by the liver, from the gallbladder to the common bile duct, which then delivers bile to the small intestine to help digest fats. Understanding this term is important when discussing bile duct health or diseases, including rare cancers affecting this area.

Cystic fibrosis (CF) is an inherited disease that causes thick, sticky mucus to build up in the lungs and digestive system. This can lead to breathing problems, repeated lung infections, and difficulty digesting food. CF is caused by changes in a gene called CFTR. While there is no cure, treatments can help manage symptoms and improve quality of life.

Cystic nephroma is a rare, non-cancerous kidney tumor made up of fluid-filled cysts. It usually occurs in young children or middle-aged adults and can affect one or both kidneys. Symptoms may include abdominal or back pain, a lump in the abdomen, blood in the urine, urinary tract infections, anemia, and fever. It may also be linked to a rare lung cancer called pleuropulmonary blastoma and certain genetic changes.

Cystitis is inflammation of the bladder, often caused by an infection. It can cause pain or burning during urination, frequent urges to urinate, and sometimes blood in the urine. Besides infections, cystitis may result from certain medicines, radiation therapy, chemical exposure, or long-term use of a bladder catheter. It is a common bladder condition that doctors diagnose using symptoms and tests.

Cystoprostatectomy, also called prostatocystectomy, is a surgery that removes both the urinary bladder and the prostate gland. Sometimes, nearby tissues like the seminal vesicles and lymph nodes are also taken out. This procedure is often part of cancer treatment. If you see this term, it’s important to ask your care team what it means for your specific situation rather than assuming it describes your diagnosis or treatment plan alone.

Cystosarcoma phyllodes of the breast, also called phyllodes tumor or CSP, is a rare tumor that grows in the connective tissue of the breast. These tumors tend to grow quickly and can become large, but they rarely spread to other parts of the body. Most are not cancer, but some can be borderline or malignant. Surgery is the usual treatment, though the tumor can sometimes come back.

A cystoscope is a thin, tube-like instrument with a light and lens used by doctors to look inside the bladder and urethra. It helps find problems like infections, stones, or tumors. Sometimes it can also remove small tissue samples. If you hear this term, ask your care team how it relates to your care, as it is a tool, not a diagnosis or treatment by itself.

Cystoscopy is a test that lets your doctor look inside your bladder and urethra using a thin, lighted tube called a cystoscope. It helps find problems like infections, bladder stones, or cancer. The procedure is done by gently inserting the cystoscope through the urethra, and it may be done with local or general anesthesia depending on the type of cystoscope used and patient comfort.

Cystourethrectomy is a surgery that removes both the bladder, which stores urine, and the urethra, the tube that carries urine out of the body. This procedure may be part of cancer treatment when these organs are affected. This entry helps connect the word with diagnoses, testing, treatments, supportive care, research notes, protocols, media, books, people, organizations, and safety concerns.

Cytarabine, also called ARA-C, is a chemotherapy drug used mainly to treat certain types of leukemia, including acute myeloid leukemia (AML). It works by stopping cancer cells from making DNA, which helps kill them. Cytarabine is often given with other drugs and may be part of treatment plans tailored to each patient’s needs. It can also be used to treat leukemia that has spread to the brain and spinal cord.

Cytochlor is a substance studied in cancer treatment that damages the DNA of cancer cells. This damage may help make cancer cells more sensitive to radiation therapy, especially for cancers that have spread to the brain. Patients should discuss with their care team how Cytochlor might relate to their specific situation rather than assuming it is a treatment recommendation on its own.

The Cytochrome P450 enzyme system is a group of enzymes mainly found in the liver that help change many drugs, including cancer medicines, into less harmful forms. This process makes it easier for the body to get rid of these drugs. If you see this term, it’s important to ask your care team how it relates to your treatment, rather than assuming it means a specific diagnosis or plan.

Cytogenetic analysis is a lab test that looks at chromosomes in cells from tissue, blood, or bone marrow. It helps doctors find changes like missing, extra, or rearranged chromosomes that may be linked to genetic diseases or some cancers. Patients should ask their care team how this test relates to their specific situation, rather than assuming it gives a diagnosis or treatment plan on its own.

Cytogenetics is the study of chromosomes, the structures in cells that carry genetic information. In cancer care, cytogenetic testing looks for changes in chromosomes, such as missing, extra, or rearranged parts. These changes can help doctors diagnose certain diseases, plan treatment, or check how well treatment is working. If you see this term in your medical records, it’s important to ask your care team what it means for your specific situation.

Cytokeratins are proteins found in the cells that line the inside and outside surfaces of the body, including skin, hair, and nails. Certain types of cytokeratins may be higher than normal in some cancers, such as lung, breast, colorectal, bladder, and head and neck cancers. Measuring cytokeratin levels can help doctors understand cancer treatment progress or detect if cancer has returned. Cytokeratin is sometimes also called keratin.

Cytokines are proteins made by immune and other cells that help control the immune system. Some cytokines are used in cancer care to boost the immune response or to reduce side effects from treatments. For example, certain cytokines help the body make blood cells damaged by chemotherapy. It’s important to understand cytokines in context and ask your care team how they relate to your treatment or symptoms.

Cytokine release syndrome (CRS) is a strong immune reaction that can happen after certain cancer treatments, like CAR T-cell therapy. It causes symptoms such as fever, low blood pressure, and trouble breathing. Medicines like Actemra (tocilizumab) are used to manage CRS by calming the immune system. If you hear this term, ask your care team how it relates to your treatment and what signs to watch for.

A cytokine storm, also called hypercytokinemia, is a strong and uncontrolled immune reaction where the body releases too many cytokines, which are molecules that help control inflammation. This can cause serious symptoms like high fever, swelling, and fatigue. It may happen due to infections, certain diseases, or as a side effect of some cancer treatments. Recognizing it early is important for managing symptoms and preventing complications.

Cytokine therapy is a type of cancer treatment that uses proteins called cytokines, made by immune cells or in the lab, to help the body fight cancer. It may boost the immune system’s ability to kill cancer cells or slow their growth. Cytokine therapy is one part of biotherapy, which includes several treatments that support the immune system. Patients should ask their care team how cytokine therapy fits into their specific treatment plan.

Cytology is the study of cells, often using samples collected from the body to check for abnormal changes. A common example is the Pap test, which collects cells from the cervix to find early signs of cervical cancer or precancer. Cytology tests help detect problems before symptoms appear, allowing for early treatment and better outcomes.

Cytomegalovirus (CMV) is a common virus that usually stays inactive in healthy people without causing symptoms. However, in people with weakened immune systems—such as those receiving cancer treatments or stem cell transplants—CMV can reactivate and cause serious infections like pneumonia. Patients and caregivers should talk with their care team about CMV risks, symptoms to watch for, and ways to prevent or treat it during cancer care.

Cytomel is a laboratory-made form of the thyroid hormone called triiodothyronine (T3). It is also known as liothyronine sodium or Triostat. Doctors use Cytomel to treat certain thyroid conditions and it is being studied for thyroid cancer. Patients may see this term in medical reports or treatment plans, so it’s important to ask your care team how it applies to your specific situation.

Cytopenia means having fewer blood cells than normal. In cancer care, this can happen due to the cancer itself or as a side effect of treatments like chemotherapy. Low platelets, a type of cytopenia, can cause bruising or bleeding. A rare condition called acquired thrombotic thrombocytopenic purpura (aTTP) involves low platelets and small blood clots and needs special tests and careful treatment.

The cytoplasm is the fluid inside a cell, surrounding the nucleus. It contains many parts that help the cell carry out important tasks, like making energy and proteins. In cancer care, understanding cells and their parts, including the cytoplasm, helps explain how cancer starts and how treatments work. If you see this term, ask your care team what it means for your specific situation.

Cytosine is a natural chemical that forms one of the four building blocks of DNA and RNA, the molecules that carry genetic information in all cells. It pairs with guanine to help hold DNA’s structure. Changes in cytosine or other DNA parts can affect how cancer grows and responds to treatment. Patients may see this term in genetic test results or educational materials about cancer.

The cytoskeleton is a network of protein fibers inside cells that gives them shape and helps organize their parts. It plays an important role in how cells move, divide, and communicate. Changes in the cytoskeleton can affect how cancer cells grow and spread. Sometimes it is also called the intracellular matrix, so checking the exact wording in medical reports can help avoid confusion.

A cytostatic agent is a substance or drug that slows or stops cells from growing and dividing without necessarily killing them. These agents can help control cancer by preventing tumor cells from multiplying and spreading, though they may not always shrink tumors. Cytostatic agents are used in cancer treatment and other medical conditions, but their effects can vary depending on the situation.

A cytotoxic agent is a substance that kills cells, including cancer cells. These agents work by stopping cancer cells from growing and dividing, which can help shrink tumors. They are often used before surgery to reduce tumor size, making it easier to remove cancerous tissue. Patients should always ask their care team how this term applies to their specific situation.

Cytotoxic chemotherapy is a cancer treatment that uses drugs to kill cancer cells by interfering with their ability to grow and divide. These drugs travel through the bloodstream to reach cancer cells anywhere in the body. While chemotherapy can help shrink tumors or control cancer, it can also affect healthy cells that divide quickly, causing side effects like low blood counts, mouth sores, and hair loss. Patients should discuss with their care team how chemotherapy fits their specific treatment plan.

A cytotoxic T cell, also called a killer T cell or cytotoxic T lymphocyte, is a type of white blood cell that helps the immune system by killing cancer cells, virus-infected cells, and other damaged cells. These cells can sometimes be grown in the lab and given to patients to help fight cancer.

A cytotoxic T lymphocyte, also called a killer T cell, is a type of white blood cell that helps the immune system by identifying and killing cancer cells, virus-infected cells, and other damaged cells. These cells can sometimes be grown in the lab and given to patients to help fight cancer.

A cytotoxin is a substance that can kill cells. In cancer care, some cytotoxins are used as treatments designed to target and destroy cancer cells. One example is NBI-3001, an experimental drug combining a natural immune protein called interleukin-4 with a bacterial toxin. Cytotoxins work by damaging or killing cells, but their use and effects depend on the specific context and treatment plan.