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An acute lymphoblastic leukemia (current term: precursor lymphoblastic leukemia) of B-or T-cell origin which according to the FAB classification is characterized by the presence of more mature-appearing lymphoblasts.
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An acute lymphoblastic leukemia occurring during childhood. The majority of cases are B-acute lymphoblastic leukemias. Approximately 15% of the cases are T-acute lymphoblastic leukemias.
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