Cancer-Related Dictionary

DNA, short for Deoxyribonucleic Acid, is a vital molecule found in all living organisms. It contains the unique genetic code that determines the traits of a living being. Structured in a double helix shape, DNA contains pairs of nucleotides, which form genes, the basic units of heredity.

Ductal carcinoma refers to a common type of breast cancer that begins in the cells lining the milk ducts, which act as transport channels from the lobules, where milk is made, to the nipple. It can remain within the ducts as a non-invasive cancer (ductal carcinoma in situ) or it can spread beyond the ducts into the breast tissue (invasive ductal carcinoma).

Dyskeratosis is a medical condition characterized by the abnormal development of keratin in the skin, leading to changes in skin texture and appearance. It can be associated with various skin disorders and may involve genetic factors.

"Dysplasia" refers to the abnormal growth or development of cells, tissues, or organs. It is often associated with an increased risk of cancer. It can occur anywhere in the body, such as in the cervix (cervical dysplasia) or hip (hip dysplasia). This condition doesn't necessarily mean you have cancer but it's significant in identifying pre-cancerous changes.

Ectopic ACTH syndrome is a condition where a tumor outside the pituitary gland produces adrenocorticotropic hormone (ACTH), leading to excessive cortisol production and symptoms of Cushing's syndrome.

Eosinophil is a type of white blood cell that plays a crucial role in the immune system. These cells are created in the bone marrow and can be found in the bloodstream and gut lining. Eosinophils are known for combating parasites and controlling mechanisms associated with allergy and asthma. An increase in eosinophils, known as eosinophilia, often indicates a parasitic infection or an allergic reaction.

Epithelial cells are a type of cell that lines the outer surfaces of organs and blood vessels throughout the body, as well as the inner surfaces of cavities in many internal organs. They serve as a barrier between the inside and outside of your body and have specialized functions including secretion, selective absorption, protection, transcellular transport and detection of sensation.

An erythrocyte, also known as a red blood cell, plays a fundamental role in the body's circulatory system by transporting oxygen from the lungs to body tissues. These biconcave-shaped cells, packed with hemoglobin, allow them to bind with and carry oxygen and carbon dioxide. They lack nuclei, making more room for hemoglobin. Erythrocytes, a vital component of blood, give it a characteristic red color.

The estrogen receptor (ER) is a protein within cells that binds to the estrogen hormone. There are two types: ER-alpha and ER-beta. Upon binding, these receptors can alter gene expression, influencing cell growth and differentiation. They play significant roles in reproductive and non-reproductive systems, and can be involved in certain diseases, including breast cancer.

Exon is a segment of a DNA or RNA molecule containing information coding for a protein or peptide sequence. It is essential for genetic expression, in which these coded sequences are translated to enable protein synthesis. Exons can also be referred to as "coding sequences" as they are transcribed into mRNA.

"Extramedullary" refers to the process or occurrence happening outside the bone marrow. It typically pertains to the production of blood cells in locations other than the bone marrow, a process known as extramedullary hematopoiesis. It may indicate certain medical conditions including anemia, leukemia, or myelofibrosis.

Extrinsic apoptosis is a process where cells are programmed to die as a way to control cell growth and maintain balance in the body. This process is triggered by external signals that activate death receptors on the cell surface, leading to a series of events that result in cell death.

A fibroid is a noncancerous growth that often develops in or around the uterus during a woman's childbearing years. They can range in size from tiny, barely visible masses to large tumors that can distort and enlarge the uterus. Although fibroids are usually benign, they can cause pelvic pain and heavy menstrual bleeding.

Grading in healthcare often refers to a system used to categorize the severity or progression of diseases, including cancer. It helps clinicians in determining the aggressiveness of the disease, its prognosis, and the most appropriate treatment approach. In broader terms, grading can also imply evaluating or assessing something in terms of quality, standard or performance.

A grading system is a method used by healthcare professionals to classify the severity or stage of a disease, particularly cancer, based on certain criteria such as cell appearance and behavior. This helps in determining the appropriate treatment plan and predicting the disease outcome.

A granulocyte is a type of white blood cell characterized by the presence of granules in its cytoplasm. There are three types: neutrophils, eosinophils, and basophils. Granulocytes play a crucial role in the body's immune system, primarily dealing with invading bacteria and infections.###

A growth factor receptor is a protein found on the surface of certain cells that binds to specific growth factors. These receptors play a crucial role in regulating cell growth, division, and survival by transmitting signals from outside the cell to the inside.

A growth factor is a naturally occurring substance, often a protein, that plays a crucial role in stimulating cellular growth, proliferation, and differentiation. They are essential for regulating various cellular processes and maintaining the health and vitality of the body. Growth factors specifically function by binding to receptors on the cell surface, triggering cellular changes.

"HER2 positive" refers to a type of breast cancer that tests positive for a protein called Human Epidermal growth factor Receptor 2 (HER2). This protein promotes the growth of cancer cells, and its presence indicates a more aggressive form of the disease. Treatment generally includes targeted therapies, which specifically affect HER2 cells.

HER2/neu is a gene that produces HER2 proteins, often associated with aggressive types of cancer, notably breast cancer. An overexpression of this gene can lead to rapid cell growth and division, contributing to tumor development. HER2-positive cancers are typically more advanced at diagnosis and require specific treatment approaches.

Hematocrit refers to a blood test that determines the proportion of red blood cells in your blood. It is often used to diagnose conditions such as anemia, dehydration, or diseases affecting red blood cell production. A higher or lower than normal hematocrit level may indicate medical conditions that need further evaluation.

A hematologist is a medical doctor specialized in the diagnosis, treatment, and prevention of diseases related to the blood, including conditions affecting blood cells, bone marrow, blood vessels, and the lymphatic system. Their work can involve managing patients with blood disorders or illnesses such as anemia, clotting problems, and blood cancers.

Hemoglobin is a protein found in red blood cells responsible for carrying oxygen from the lungs to the body's tissues and returning carbon dioxide back to the lungs. It gives the blood its red color and helps maintain the body's overall health and vitality.

Heterogeneity refers to the presence of diverse and distinct characteristics within a particular group or system. In a medical context, it often describes the differences in cells, tissues, or diseases, indicating variability in genetic, molecular, or clinical features.

"High-grade" refers to a high level of quality or superiority in comparison to others. It signifies excellence, top-notch, premium or first-class. Used in various contexts such as medical to indicate severe or advanced stage of cancer, academic to imply excellent scores, or mining for rich mineral content.

"Hormone Receptor Status" refers to a clinical parameter determined in patients with certain types of cancers. It reveals whether the patient's cancer cells express specific proteins (hormone receptors) like estrogen and progesterone, signifying their dependency on these hormones for growth. This information influences the selection of optimal therapeutic strategies, informing decisions on hormone therapy use.

Hypercalcemia is a medical condition characterized by an abnormally high level of calcium in the blood. It can be caused by several factors such as hyperparathyroidism, certain types of cancer, or excessive intake of vitamin D. Symptoms may include frequent urination, fatigue, nausea, or bone pain. If left untreated, it can lead to serious complications, including kidney stones and cognitive issues.

"Hyperplasia" refers to an increased growth rate in an organism's cells leading to a rapid augmentation in the size of an organ or tissue. It's a common response to stimuli and not necessarily associated with cancer, but some forms could elevate cancer risk.

Hypofractionation is a method used in radiation therapy where the total dose of radiation is divided into large doses and treatments are given less often than traditional radiation therapy. This approach minimizes the treatment duration, potentially enhancing the convenience and effectiveness of the therapy.

Immuno-oncology is a subfield of medical research that explores the body's immune system's potential to fight cancer. It investigates how cancer manipulates the immune system and ways to harness the immune response to destroy cancer cells. Its therapies have revolutionized cancer treatment.

Immunogenicity refers to the ability of a substance, such as a vaccine or therapeutic protein, to provoke an immune response in the body. This response can be beneficial, as in the case of vaccines, or undesirable, as it can lead to adverse reactions or reduce the effectiveness of treatments.

Immunoglobulin refers to any class of proteins, produced by the immune system, that function as antibodies in the response to an invasion by foreign substances, such as bacteria and viruses. They play a crucial role in identifying and neutralizing these pathogens, enhancing immune responses.

Infertility is defined as the inability to achieve a successful pregnancy after a 12-month period of appropriately timed, unprotected intercourse. It is well established that it can result from various cancer treatments. Patients who received alkylating agents, cisplatin, and other heavy metal-containing chemotherapy are at risk. Radiation therapy to the hypothalamus/pituitary axis, ovaries, or testes has the potential to significantly increase this risk. One’s own fertility status can be checked via fertility tests but there is no absolute way to test for future fertility potential in either cancer survivors or the general population. Ovarian reserve tests only provide indirect estimates and do not predict natural fertility potential in regularly ovulating women, and likewise, semen analysis cannot absolutely predict sterility in males.

Intraductal papilloma is a small, benign tumor that forms in the milk ducts of the breast, close to the nipple. It might cause nipple discharge and discomfort, but it's not cancerous. However, it can slightly increase the risk of developing breast cancer in the future.

Invasive cancer refers to a type of cancer that has spread beyond the layer of tissue where it initially developed and started invading surrounding, healthy tissues. It's also known as infiltrating cancer. Notably, it is more serious than in situ (noninvasive) cancer, which remains within its original location.

A "Lipoma" is a benign and typically slow-growing tumor made of fatty tissue. It often appears under the skin and can feel soft to touch. Most commonly found in adults between 40 to 60 years old, lipomas can form anywhere on the body but are usually located on the shoulders, neck, or trunk. They are generally harmless and may only need removal for cosmetic reasons or if they cause discomfort or impede movements.

Long-term follow-up (LTFU) care is important for childhood, adolescent, and young adult cancer survivors due to their high risk of late effects. LTFU includes prevention, early detection, and management of late effects to improve the quality of survivorship. Additionally, follow-up provides an opportunity to offer age-appropriate information about disease, treatment, and a healthy lifestyle, as well as practical advice about insurance, education or work, and psychosocial support. Current LTFU guidelines for mental health problems note that healthcare providers and survivors of childhood, adolescent and young adult cancer should be aware that survivors are at risk for mental disorder symptoms.

Lymph nodes are small, bean-shaped structures that act as filters for harmful substances and are essential to the immune system. They produce immune cells to fight infections and trap viruses, bacteria, and other causes of illnesses before they can infect other parts of the body.

The lymphatic system, a vital part of the immune system, comprises a network of lymphatic vessels that carry a clear fluid called lymph. It is responsible for removing toxins and waste from the body, transporting white blood cells to fight infections, and facilitating the absorption of fat and fat-soluble vitamins from the digestive system.

Lymphatic vessels are an integral part of the human body's immune system. These thin-walled structures are akin to a network of tubes that assist in circulating lymph, a bodily fluid containing white blood cells that fight infections. They facilitate the removal of toxins and waste from the body's tissues, ultimately draining the lymph into the bloodstream.

Lymphedema is a medical condition characterized by chronic swelling, typically in the arms or legs, due to a blockage in the lymphatic system that prevents lymph fluid from draining adequately. The blockage leads to an accumulation of fluid causing swelling. It often arises as a complication of cancer treatments like surgery or radiation. Being a long-term condition, it requires continuous management.

A lymphoblast is an immature cell that originates from the lymphoid line of blood cells and is at the earliest stage of lymphocyte development in the bone marrow. It is generated as part of the body's immune response and transforms into a lymphocyte upon maturation. Lymphoblasts play a crucial role in managing infections and diseases. However, their overproduction can lead to certain types of leukemia.

Lynch syndrome, also known as hereditary nonpolyposis colorectal cancer (HNPCC), is a type of inherited cancer syndrome associated with a genetic predisposition to different cancer types. It drastically increases the risk of cancers, primarily colorectal and endometrial but also ovarian, stomach, and other organs. The syndrome is caused by mutations in the mismatch repair genes.

"Malignant" is an adjective commonly used in medical contexts, referring to a severe and progressively worsening disease, often cancer. It denotes conditions characterized by uncontrolled growth, induction of damage to surrounding tissues, and the potential to spread to other body organs, causing serious health risks and possibly death.

"Mammary" refers to the bodily system in mammals which produces milk for offspring. Most commonly, it is used to designate the mammary glands, which in females are the breasts. This system is crucial for nourishing newborns and plays a significant role in reproductive health. The word is often used in medical contexts related to lactation and breast health.

Melanocytes are a type of skin cells found in the lower part of the epidermis, the top layer of the skin. These cells are primarily responsible for the production of melanin, the pigment that gives skin, hair, and eyes their color. Melanocytes play a crucial role in protecting skin from harmful effects of UV radiation from the sun.

Metaplasia is a pathological process where one type of mature cell is replaced by another type within the same category. Usually triggered by stress or damage, metaplasia is generally adaptive and reversible, changing to accommodate to the new environment. However, it can also present initial stages of carcinogenesis if left unnoticed and unmanaged.

Metastasis is a medical term referring to the process by which cancer cells spread from the initial tumor site to other parts of the body via the blood or lymph system, forming secondary tumors or 'metastases'. This ability largely defines a cancer's aggressiveness and has significant implications for treatment strategies and prognosis.

A Microarray is a laboratory tool used to detect the expression of thousands of genes simultaneously. It's a two-dimensional grid where probes (DNA or RNA fragments) are attached. By analyzing the way a sample interacts with these probes, scientists can measure the expression levels of massive quantities of genes, making it a crucial tool in genomics research.

Mitosis is a process of cell division that results in two genetically identical daughter cells developing from a single parent cell. This is a fundamental process for growth, development, and repair in multi-cellular organisms. In essence, mitosis ensures each new cell has the same DNA as the original.