Cancer-Related Dictionary

Acquired resistance refers to the ability of a disease-causing organism, such as bacteria or cancer cells, to develop resistance to a drug or treatment that was previously effective. This change occurs over time, often due to genetic mutations or adaptations that allow the organism to survive despite the presence of the treatment.

Adenocarcinoma is a type of cancer that starts in the glandular cells, which are found in various organs of the body. These cells secrete mucus, digestive enzymes, or hormones, among other substances. Adenocarcinomas can occur in different parts of the body, most commonly in the lungs, colon, prostate, and breasts. It is a malignant tumor and treatment varies depending on the location and stage of the disease.

Adenoma is a type of non-cancerous (benign) tumor that originates from glandular tissue. While most adenomas are non-threatening, they have the potential to become malignant (cancerous). Adenomas can form in any gland in the body, including the lungs, adrenal glands, colon, and pituitary glands, among others. The symptoms and treatment vary depending on their location.

Adenopathy refers to the medical condition characterized by the abnormal enlargement of the lymph nodes, which are vital parts of the immune system. The swelling may be due to infections, chronic inflammatory conditions, or malignancies. It's often detected through physical examination or imaging studies.

Adenosis refers to a medical condition where there is an abnormal growth or development in glandular tissues in the body. It results from an alteration in the normal cells of a gland, which may lead to benign or malignant tumors. Its manifestation greatly varies, depending on the location in the body and its histological type.

Adolescents and Young Adults (AYA) is a term typically used in healthcare to denote a specialized group ranging from ages 15 to 39. This group experiences unique health issues, including specific cancers and mental health disorders, which may require distinct treatment strategies and healthcare models.

Allogeneic refers to cells, tissues, or organs that are sourced from a genetically different individual of the same species. In healthcare, it often describes donor material for transplants such as Allogeneic Stem Cell Transplant, where donor stem cells are introduced to the recipient to aid disease treatment.

Alopecia, also known as hair loss, is a medical condition that involves the thinning or complete loss of hair from areas where it normally grows. This can affect the scalp, face, and body, and can occur due to various factors including genetics, hormonal changes, immune system abnormalities, or as a side effect of certain treatments or medications.

Alpha-fetoprotein (AFP) is a specific protein produced primarily in the fetus's liver and is present in both the amniotic fluid and mother's blood. Post-birth, its production usually stops, with high levels in adults often associated with liver diseases, germ cell tumors, or an indication of certain cancers. AFP, hence, serves as a bio-marker in medical diagnostic procedures.

"Anaplastic" is a term often used in the medical field, particularly in oncology, to describe cancer cells that have lost their distinct characteristics and appear undifferentiated. These cells exhibit irregular growth and lack the typical specialized features of healthy cells, often making the disease more aggressive and harder to treat.

Androgen is a type of hormone that plays a crucial role in the development and maintenance of male characteristics in mammals. It includes hormones like testosterone and dihydrotestosterone, which are produced primarily in male testes and female ovaries to regulate sexual development, muscle mass, bone density, and hair growth.

Anemia is a medical condition characterized by a deficiency in red blood cells or hemoglobin in the blood, leading to a lack of oxygen reaching the body's tissues. Hemoglobin is responsible for carrying oxygen, so any insufficiency can cause fatigue, weakness, and shortness of breath. Anemia can be temporary or long-term, and range from mild to severe. It's important to diagnose and treat anemia to handle any underlying causes and to prevent further health problems.

Aneuploidy refers to an abnormality in the chromosome number in a cell, where there's either an excess or a deficiency of one or multiple chromosomes. This variation from the normal chromosome number (diploid) often leads to various genetic disorders. The most common example is Down syndrome, caused by an extra copy of chromosome 21.

Angiogenesis is a physiological process involving the growth of new blood vessels from pre-existing ones. Predominantly occurring during development, wound healing, and the formation of granulation tissue, it's also a critical step in the transition of tumors from a benign state to a malignant one.

Anorexia, medically known as Anorexia Nervosa, is a serious and potentially life-threatening mental health disorder characterized by self-starvation and excessive weight loss. Individuals with this condition have an irrational fear of weight gain and a distorted body image. Treatment typically involves a multidisciplinary approach integrating medical, nutritional, and therapeutic components.

Aplastic anemia is a rare, serious blood disorder in which the body's bone marrow fails to produce enough new blood cells, leading to a deficiency in all three blood cell types: red blood cells, white blood cells, and platelets. This condition can lead to uncontrolled bleeding, increased susceptibility to infections, and constant fatigue. It can occur at any age, sometimes without known cause.

Apoptosis is a programmed cell death mechanism in the body, operating as a natural process of destructing old, faulty, or harmful cells. It's crucial for maintaining the balance in various bodily functions, from embryonic development to adult homeostasis. It's often subject to research in disease contexts, notably cancer, where apoptosis regulation fails.

Apoptotic bodies are small, membrane-bound vesicles that form when a cell undergoes apoptosis, which is a type of programmed cell death. During this process, the cell's components are broken down and packaged into these bodies, which are then typically engulfed and digested by nearby cells.

Asbestos is a naturally occurring mineral that has heat-resistant properties. It was widely used in construction and manufacturing due to its strength and fire-resistant qualities. However, its fibers can cause serious health issues, like lung cancer and mesothelioma, when inhaled or ingested, leading to its ban in many countries.

Ascites refers to an abnormal accumulation of fluid in the abdominal cavity, often resulting from severe liver disease, like cirrhosis. The excess fluid causes discomfort and can make breathing difficult. It's usually treated by diet alterations, diuretics, or drainage procedures.

Asparaginase is a therapeutic enzyme used in medical treatment, particularly in the management of acute lymphoblastic leukemia (ALL). It functions by breaking down asparagine, an amino acid crucial for cell growth, thereby inhibiting the proliferation of malignant cells that rely heavily on asparagine.

Atypical ductal hyperplasia (ADH) is a non-malignant condition where breast duct cells are multiplying abnormally, creating a higher risk for breast cancer. Although it isn't cancer itself, finding ADH prompts further diagnostic evaluation and possibly more frequent breast cancer screening.

"B-cell" refers to a type of white blood cell that plays a pivotal role in the immune system. B-cells can mature into cells that produce antibodies, specialized proteins that help fight infections, viruses and diseases. They also create immune memory, enabling the immune system to respond more efficiently to future exposures to the same pathogens.

Basal cells are a type of cell found at the bottom layer of the skin, known as the epidermis. These cells are responsible for skin regeneration, producing new skin cells and pushing older cells upward. Abnormal growth of basal cells can lead to basal cell carcinoma, the most common type of skin cancer.

"Benign" refers to a condition, tumor, or growth that is not harmful in effect and not malignant. It is non-cancerous and does not spread to other parts of the body. It denotes a mild form or consequence that does not typically become life-threatening or seriously damaging. In healthcare, benign is often associated with a positive prognosis.

Beta Human Chorionic Gonadotropin (Beta HCG) is a hormone produced by cells that are associated with pregnancy. It's usually detected in blood tests or urine tests to confirm pregnancy or as part of a screening test for certain birth defects. It can also be used in medical diagnostics to detect some cancers.

A biomarker, short for biological marker, is a measurable indicator of some biological state or condition. It refers to a broad category of medical signs that can be observed from outside the patient, which can indicate the presence, severity, or progression of a disease or the effectiveness of treatment.

Bone metastasis refers to the condition wherein cancer cells from the primary site (like breast, lung, or prostate) spread to the bones. This is a common occurrence in advanced stages of cancer, causing pain, fractures and other complications. The occurrence of bone metastasis often indicates a poorer prognosis for cancer patients.

Brain metastasis refers to the condition where cancer cells spread from their original site to the brain. This usually occurs when cancer from other parts of the body propagates through the bloodstream to the brain tissue, leading to secondary brain tumors. Brain metastasis is a serious and often late-stage complication of cancer.

A brain tumor is an abnormal growth or mass of cells within the brain. These tumors can be either benign (non-cancerous) or malignant (cancerous) and can originate from the brain tissue itself or from other parts of the body, spreading to the brain. The presence of a brain tumor can disrupt normal brain function by compressing surrounding structures, causing neurological symptoms, and potentially leading to serious health issues. Diagnosis and treatment of brain tumors involve various medical interventions, such as imaging studies, surgery, radiation therapy, and chemotherapy, depending on the type, location, and characteristics of the tumor.

A breast duct papilloma is a small, benign tumor that forms in the milk ducts of the breast. It is often characterized by a wart-like growth and can cause nipple discharge or discomfort. While not cancerous, it may require removal to alleviate symptoms or rule out cancer.

CA 125, or Cancer Antigen 125, is a protein that is often elevated in the blood of women with ovarian cancer. It's used as a biomarker in medical tests to monitor treatment response or detect recurrence in patients with this type of cancer. It is also used as a diagnostic tool, although it's not specific, since other conditions can also raise CA 125 levels.

CA 19-9, or Carbohydrate Antigen 19-9, is a tumor marker primarily used to monitor treatment response and disease recurrence in pancreatic cancer patients. It can also be elevated in other gastrointestinal cancers and conditions such as cirrhosis and pancreatitis. It's not recommended for cancer screening in asymptomatic individuals due to non-specific findings.

"CAYAs" is an acronym referring to "Children, Adolescents, and Young Adults," particularly in medical studies focusing on cancer patients under the age of 39.

Cachexia is a severe, complex medical condition characterized by extreme weight loss and muscle atrophy, generally observed in individuals suffering from chronic illnesses such as cancer, HIV/AIDS, and heart failure. It's linked with poor response to therapy, decreased quality of life, and increased mortality.

Cancer cachexia is a complex syndrome characterized by severe weight loss, muscle wasting, and loss of appetite, often seen in patients with advanced cancer. It is not simply a result of reduced food intake but involves metabolic changes that make it difficult for the body to maintain weight and muscle mass.

Cancer Stage (I, II, III, IV) refers to the extent of cancer spread in the body, determined by the size and location of the tumor, lymph node involvement, and whether the disease has metastasized. Stage I usually indicates a small tumor confined to the origin site. Stage II and III show larger tumors or greater spread to nearby tissues and nodes. Stage IV symbolizes advanced cancer that has spread to distant parts of the body.

A carcinogen refers to any substance, radionuclide, or radiation that promotes carcinogenesis, the formation of cancer. It works by altering the cellular metabolism or damaging DNA directly in cells, which in turn can induce the development of cancerous growths. Hence, exposure to carcinogens increases cancer risk. Examples include tobacco smoke, asbestos, and certain chemicals.

Carcinoma is a type of cancer that starts in cells making up the skin or the tissue lining organs, such as the liver or kidneys. Unlike sarcomas, carcinomas originate in epithelial cells, including those in glandular tissues. These cancers can affect many parts of the body, often leading to specific symptoms based on their location and stage. Treatment typically involves a combination of surgery, radiation, and chemotherapy.

"Carcinoma in situ" is a medical term referring to a group of abnormal cells that remain in their original location. These cells have the potential to become cancerous, but they haven't spread to surrounding tissues or other parts of the body. It's the earliest stage of cancer, often highly treatable when detected promptly.

The cell cycle is a sequence of events that a cell undergoes, encompassing the period from its formation to its division into two daughter cells. It involves stages such as the growth phase (G1), DNA synthesis (S phase), second growth phase (G2), and mitosis (M phase). This process ensures both growth and repair of tissues across multicellular organisms.

Circulating tumor cells (CTCs) are cancer cells that have detached from a primary tumor and circulate in the bloodstream. These cells have the potential to spread cancer to other parts of the body through a process known as metastasis, making them a significant focus of cancer research and diagnosis.

Clinical endpoints are specific events or outcomes in a clinical study that are used to determine the effect of a treatment. They are measurable and objective, such as survival rates, symptom improvement, or the occurrence of a disease.

Complete remission is a term used in medicine to describe the absence of all signs of cancer in response to treatment. While the disease is undetectable, it does not necessarily mean the cancer is cured, as it may still be present at a microscopic level.

A "Complete response" in a healthcare context typically refers to the total disappearance of all detectable signs and symptoms of disease, often as a result of treatment. It indicates a positive outcome where the individual shows no further evidence of the illness. However, it doesn't guarantee that the disease is permanently cured. It's an important effect reported in clinical trials and cancer treatment.

Computational oncology is a field of medicine that uses computer-based models and simulations to understand cancer development, progression, and treatment. It combines data from various sources, such as genetic information and medical imaging, to create personalized treatment plans and improve patient outcomes.

"Cribriform" is a term used in anatomy and histology, referring to a structure that appears perforated or sieve-like. The term is frequently used to describe a structural pattern characterized by numerous round, small openings - resembling a sieve. This term is often mentioned with the cribriform plate of the ethmoid bone in the skull or in pathological processes like cribriform carcinoma.

A cyst is a sac-like pocket of membranous tissue that contains fluid, air, or other substances. They can form anywhere within the body as a result of various causes such as infections, genetical conditions, or blockages in ducts. Though most cysts are benign, they can sometimes lead to serious complications, and as such, medical advice should be sought when one is discovered.

Cytokines are small proteins released by cells that have a specific effect on the interactions, communication or behavior of cells. They are key players in health and disease, particularly in immune responses. Cytokines aid cell to cell communication in immune responses and stimulate the movement of cells towards sites of inflammation, infection, and trauma.

Cytotoxic granules are specialized structures found in certain immune cells, such as cytotoxic T lymphocytes and natural killer cells. These granules contain proteins that can destroy infected or cancerous cells, helping the immune system to protect the body from disease.