ABL1 and chronic myelogenous leukemia, BCR-ABL1 positive: Expression of the TEL/ABL oncogenic fusion protein is observed in T- and pre-B cell acute lymphoblastic leukemias and some CML subsets [56–58], and promotes constitutive activation of STAT5, ERK, AKT and other pathways to facilitate the growth and survival of cancer cells [59–61].