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|Ref Type||Journal Article|
|Authors||Gurska LM, Okabe R, Schurer A, Tong MM, Soto M, Choi D, Ames K, Glushakow-Smith S, Montoya A, Tein E, Miles LA, Cheng H, Hankey-Giblin P, Levine RL, Goel S, Halmos B, Gritsman K|
|Title||Crizotinib Has Preclinical Efficacy in Philadelphia-Negative Myeloproliferative Neoplasms.|
|Abstract Text||The Philadelphia chromosome-negative myeloproliferative neoplasms (MPN) polycythemia vera, essential thrombocythemia, and primary myelofibrosis are characterized by JAK/STAT pathway activation. JAK inhibitors are approved for MPN treatment, but persistence has been observed, due to JAK/STAT reactivation.Using MPN patient samples, JAK2-mutated cell lines, and MPN mouse models, we examined both the efficacy and mechanism by which crizotinib, the ALK/MET/RON/ROS1 inhibitor approved for the treatment of non-small cell lung cancer, alters MPN cell proliferation and JAK/STAT activation.We found that crizotinib suppresses proliferation and activation of JAK/STAT signaling, and decreases the disease burden in the JAK2V617F mouse model of MPN. Furthermore, we found that crizotinib could overcome JAK inhibitor persistence to ruxolitinib. Interestingly, phosphorylation of the crizotinib target RON kinase was enhanced in ruxolitinib-persistent cells. We show that phospho-JAK2 and phospho-RON can physically interact to sustain JAK/STAT signaling, and that the combination of crizotinib and ruxolitinib disrupts this interaction. Furthermore, RON knockdown suppresses proliferation and activation of JAK/STAT signaling in JAK2-mutated cells, and RON deletion in a JAK2V617F mouse MPN model decreases the disease burden. We also observed RON hyperactivation in MPN patient cells, suggesting that RON may be an important target of crizotinib in MPN.In summary, we demonstrate that crizotinib has preclinical efficacy in MPN patient cells, JAK2-mutated cell lines, and a JAK2-mutated mouse model, and that the combination of crizotinib with JAK inhibitors suppresses JAK inhibitor persistence. Our work suggests that crizotinib should be investigated for the treatment of patients with MPN.|
|Molecular Profile||Treatment Approach|
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|Therapy Name||Drugs||Efficacy Evidence||Clinical Trials|
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|Gene||Variant||Impact||Protein Effect||Variant Description||Associated with drug Resistance|
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|JAK2 V617F||hematologic cancer||sensitive||Crizotinib||Preclinical - Cell culture||Actionable||In a preclinical study, Xalkori (crizotinib) inhibited cell proliferation and phosphorylation of Stat3, Jak2, and Ron in hematopoietic cell lines harboring JAK2 V617F in culture (PMID: 36537918).||36537918|
|JAK2 V617F||polycythemia vera||sensitive||Crizotinib||Preclinical - Patient cell culture||Actionable||In a preclinical study, Xalkori (crizotinib) inhibited colony formation and Stat5 phosphorylation in polycythemia vera cultured cells derived from an EML4-ALK-positive non-small cell lung cancer patient who was diagnosed with polycythemia vera and found to harbor JAK2 V617F (PMID: 36537918).||36537918|
|JAK2 V617F||myeloproliferative neoplasm||sensitive||Crizotinib||Preclinical||Actionable||In a preclinical study, Xalkori (crizotinib) treatment resulted in reduced spleen weights in a myeloproliferative neoplasm knock-in mouse model expressing JAK2 V617F (PMID: 36537918).||36537918|