Philadelphia chromosome-positive acute lymphoblastic leukemia (Ph <sup>+</sup> ALL) is triggered by BCR/ABL tyrosine kinase which activates the downstream signaling pathways, such as Akt/mTOR, RAF/MEK/ERK, and STAT5 pathways.
Together, these studies indicate that targeting STAT5 or STAT5-regulated pathways may provide a new approach for therapy development in Ph+ ALL, especially the relapsed/TKI-resistant disease.<b>Significance:</b> Suppression of STAT5 by BCL2 and PIM kinase inhibitors reduces leukemia burden in mice and constitutes a new potential therapeutic approach against Ph+ ALL, especially in tyrosine kinase inhibitor-resistant disease.<i></i>.
Philadelphia chromosome-positive acute lymphoblastic leukemia (Ph+ ALL) is triggered by constitutively activated BCR-ABL and SRC family tyrosine kinases.They account for the activations of multiple growth-signaling pathways, including Raf/MEK/ERK, Akt/mTOR and STAT5 pathways.