T-cell acute lymphoblastic leukemia (ALL) accounts for 15% of ALL cases in children and has been associated with a worse prognosis. Cytogenetic studies show an abnormal karyotype in 50-60% of the T-cell ALL patients; ABL1 fusions are present in approximately 8% of the cases. Dasatinib, a second-generation tyrosine kinase inhibitor, directly targets the BCR-ABL gene. We describe a pediatric case of T-cell ALL with amplification of the ABL1 gene in which remission was achieved only after the addition of dasatinib to conventional chemotherapy.
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