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precursor B-lymphoblastic leukemia (pree-KER-ser B-LIM-foh-BLAS-tik loo-KEE-mee-uh)

 An aggressive (fast-growing) type of leukemia (blood cancer) in which too many B-cell lymphoblasts (immature white blood cells) are found in the bone marrow and blood. It is the most common type of acute lymphoblastic leukemia (ALL). Also called B-cell acute lymphoblastic leukemia and B-cell acute lymphocytic leukemia.



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