A white blood cell that comes from the bone marrow. As part of the immune system, B cells make antibodies and help fight infections. Also called a B lymphocyte.
A test to get samples of tissues and cells.
Examination of the inside of the colon using a colonoscope, inserted into the rectum. A colonoscope is a thin, tube-like instrument with a light and a lens for viewing.
A type of X-ray that takes a series of detailed pictures of the body.
Examination of the digestive tract using an endoscope. An endoscope is a thin, flexible, tube-like instrument with a light and a lens for viewing.
A network of cells and organs that protects the body from disease organisms, other foreign bodies, and cancers.
Also called a lymph gland. A rounded mass of lymphatic tissue that is surrounded by a capsule of connective tissue. Lymph nodes filter lymph (lymphatic fluid), and they store lymphocytes (white blood cells). They are located along lymphatic vessels.
A type of white blood cell. Lymphocytes have a number of roles in the immune system, including the production of substances that fight infections and other diseases.
The general name for many related subtypes of cancer that arise in the lymphocytes.
A type of immune cell that can attack tumor cells or cells infected with a virus.
A procedure in which a small amount of radioactive sugar is injected into a vein and a scanner is used to make detailed, computerized images of areas inside the body where the sugar is taken up.
Blood cells that are essential for blood clotting.
A disease state or condition that does not respond to treatment or medication.
The return of signs and symptoms of cancer after a period of treatment or medication.
One type of white blood cell that attacks virus-infected cells, foreign cells, and cancer cells. T cells also produce a number of substances that control the immune response. Also called a T lymphocyte.
A type of cell that is found in the blood and lymph tissue that helps fight infections and diseases. Lymphocytes are a type of white blood cell.