NCI Dictionary of Cancer Terms
The NCI Dictionary of Cancer Terms features 8,208 terms related to cancer and medicine.
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- immune system
- listen (ih-MYOON SIS-tem)
- A complex network of cells, tissues, organs, and the substances they make that helps the body fight infections and other diseases. The immune system includes white blood cells and organs and tissues of the lymph system, such as the thymus, spleen, tonsils, lymph nodes, lymph vessels, and bone marrow.
- immune system disorder
- listen (ih-MYOON SIS-tem dis-OR-der)
- A condition that affects the immune system. The immune system is made up of cells, tissues, and organs that help the body fight infections and other diseases. There are many different types of immune system disorders, including immunodeficiency disease, autoimmune disorders, and allergic disorders. Immunodeficiency disease occurs when a part of the immune system is missing or not working properly. Autoimmune disorders occur when the immune system recognizes its own tissues as foreign and attacks them. Allergic disorders occur when the immune system overreacts to substances that are usually not harmful, such as pollen, molds, and certain foods. Cancers of the immune system (such as leukemia and lymphoma) are also immune system disorders.
- immune system tolerance
- listen (ih-MYOON SIS-tem TAH-leh-runts)
- The failure of the immune system to respond to an antigen that previously caused an immune response.