Definition:
T-cell acute lymphoblastic leukemia
 (T-sel uh-KYOOT LIM-foh-BLAS-tik loo-KEE-mee-uh)An aggressive (fast-growing) type of leukemia (blood cancer) in which too many T-cell lymphoblasts (immature white blood cells) are found in the bone marrow and blood. Also called precursor T-lymphoblastic leukemia and T-cell acute lymphocytic leukemia.
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