ABL1 and chronic myelogenous leukemia, BCR-ABL1 positive: p210Bcr-Abl expression is a causative event in over 95% of human chronic myelogenous leukemia (CML) cases, while p185Bcr-Abl is found in 60–80% of Ph-positive B cell acute lymphocytic leukemia (Ph+ B-ALL) cases [3–5].