ruxolitinib-jak-janus-tyrosine-kinase-inhibitor-myelofibrosis-COMFORT Published December 24, 2012 at 1660 × 1200 in Ruxolitinib Ruxolitinib is a potent and selective Janus kinase (JAK) 1 and 2 inhibitor, Aproved for therapy, in patients with myelofibrosis.