ABL1 and chronic myelogenous leukemia, BCR-ABL1 positive: Finally, given the recognized role of MYC in v-ABL1 transforming potential [21], we confirmed that MYC silencing in CML cell lines resulted, together with BCR and BCR/ABL1 down-modulation, in a highly significant growth arrest (p < 0.0001) (Fig. 4b and d) and in induction of cell death (Fig. 4a, c and e).