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

 A type of leukemia (blood cancer) in which too many T-cell lymphoblasts (immature white blood cells) are found in the blood and bone marrow. Also called T-cell acute lymphoblastic leukemia and T-cell acute lymphocytic leukemia.

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