Skip to main content
An official website of the United States government
Español
Government Funding Lapse
Because of a lapse in government funding, the information on this website may not be up to date, transactions submitted via the website may not be processed, and the agency may not be able to respond to inquiries until appropriations are enacted.

The NIH Clinical Center (the research hospital of NIH) is open. For more details about its operating status, please visit cc.nih.gov.

Updates regarding government operating status and resumption of normal operations can be found at opm.gov.

mast cell leukemia

(mast sel loo-KEE-mee-uh)
A very rare, aggressive (fast-growing) type of systemic mastocytosis in which too many immature mast cells (a type of white blood cell) are found in the bone marrow and blood. It may develop in patients who have a buildup of mast cells caused by a condition called aggressive systemic mastocytosis. Mast cell leukemia is hard to treat and has a poor prognosis (outcome).
Search NCI's Dictionary of Cancer Terms