Momelotinib (CYT387)

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Mechanism of action

From the NCI Drug Dictionary: An orally bioavailable small-molecule inhibitor of Janus kinases 1 and 2 (JAK1/2) with potential antineoplastic activity. Momelotinib competes with JAK1/2 for ATP binding, which may result in inhibition of JAK1/2 activation, inhibition of the JAK-STAT signaling pathway, and so the induction of apoptosis and a reduction of tumor cell proliferation in JAK1/2-expressing tumor cells.

Preliminary data


  • Pardanani A, Laborde RR, Lasho TL, Finke C, Begna K, Al-Kali A, Hogan WJ, Litzow MR, Leontovich A, Kowalski M, Tefferi A. Safety and efficacy of CYT387, a JAK1 and JAK2 inhibitor, in myelofibrosis. Leukemia. 2013 Jun;27(6):1322-7. Epub 2013 Mar 5. PubMed
  • SIMPLIFY-1: Mesa RA, Kiladjian JJ, Catalano JV, Devos T, Egyed M, Hellmann A, McLornan D, Shimoda K, Winton EF, Deng W, Dubowy RL, Maltzman JD, Cervantes F, Gotlib J. SIMPLIFY-1: a phase III randomized trial of momelotinib versus ruxolitinib in Janus kinase inhibitor-na├»ve patients with myelofibrosis. J Clin Oncol. 2017 Dec 1;35(34):3844-3850. Epub 2017 Sep 20. link to original article PubMed
  • SIMPLIFY 2: Harrison CN, Vannucchi AM, Platzbecker U, Cervantes F, Gupta V, Lavie D, Passamonti F, Winton EF, Dong H, Kawashima J, Maltzman JD, Kiladjian JJ, Verstovsek S. Momelotinib versus best available therapy in patients with myelofibrosis previously treated with ruxolitinib (SIMPLIFY 2): a randomised, open-label, phase 3 trial. Lancet Haematol. 2018 Feb;5(2):e73-e81. Epub 2017 Dec 20. link to original article PubMed

Also known as

  • Code names: CYT387, GS-0387