Dasatinib (Sprycel®) is a highly potent small-molecule inhibitor of BCR-ABL and Src family tyrosine kinases, which is indicated for the treatment of adults with newly diagnosed chronic-phase chronic myeloid leukemia (CML), resistance or intolerance to prior CML therapy, or Philadelphia chromosome-positive (Ph+) acute lymphoblastic leukemia (ALL). The gene discussed is SRC; the disease is chronic myelogenous leukemia, BCR-ABL1 positive.