Ruxolitinib (INC424, INCB18424, trade names Jakafi and Jakavi, by Incyte Pharmaceuticals and Novartis) is a drug for the treatment of intermediate or high-risk myelofibrosis, a type of myeloproliferative disorder that affects the bone marrow.
It is also being investigated for the treatment of other types of cancer (such as lymphomas and pancreatic cancer),for polycythemia vera, for plaque psoriasis, and for alopecia areata.
Ruxolitinib is a Janus kinase inhibitor with selectivity for subtypes JAK1 and JAK2 of this enzyme. Ruxolitinib inhibits dysregulated JAK signaling associated with myelofibrosis. JAK1 and JAK2 recruit signal transducers and activators of transcription (STATs) to cytokine receptors leading to modulation of gene expression.