NCI Dictionary of Cancer Terms

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The NCI Dictionary of Cancer Terms features 7,804 terms related to cancer and medicine.

Browse the dictionary by selecting a letter of the alphabet or by entering a cancer-related word or phrase in the search box.

mercaptopurine
(mer-KAP-toh-PYOOR-een)
A drug used to treat acute lymphoblastic leukemia. It may also be used to treat certain other conditions, such as Crohn disease and ulcerative colitis. Mercaptopurine stops cells from dividing and may kill cancer cells. It is a type of antimetabolite. Also called Purinethol and Purixan.