The miR300-induced apoptosis is associated with downregulation of CCND2/CDK6, SET, and other PP2A-regulated CML survival-promoting factors such as JAK2, CTNNB1, Twist1, and MYC; therefore, the inactivation of PP2A is vital for survival of quiescent LSCs. Here, PTPA is linked to chronic myelogenous leukemia, BCR-ABL1 positive.