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Leukemia: Cancer that starts in blood-forming tissue, such as the bone marrow, and causes large numbers of abnormal blood cells to be produced and enter the bloodstream.

Abstractor Notes
For more information on leukemia, including specific leukemia subtypes, see the Hematopoietic and Lymphoid Neoplasms Database, see http://seer.cancer.gov/seertools/hemelymph/