ABL1 and chronic myelogenous leukemia, BCR-ABL1 positive: Synergistic effects of vorinostat 1 or sodium butyrate 23 with imatinib 29, an ABL kinase inhibitor that can kill Breakpoint cluster region—Abelson (BCR-ABL) positive chronic myeloid leukemia (CML) cells, were observed and shown to enhance apoptosis in BCR-ABL expressing CML cells.