A phase of chronic myelogenous leukemia in which 20% or more of the cells in the blood or bone marrow are blast cells (immature blood cells). When tiredness, fever, and an enlarged spleen occur during the blastic phase, it is called blast crisis.
( BLAS-tik fayz KRAH-nik MY-eh-LAH-jeh-nus loo-KEE-mee-uh )
Source: NCI Dictionary of Cancer Terms
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