This is a multicenter, open-label, non-randomized, dose escalation study of ruxolitinib, a small molecule Janus kinase (JAK) inhibitor, administered orally to patients with PMF, PPEV-MF or PET-MF. The study is comprised of 3 parts:
Part 1: Dose escalation and determination of maximum tolerated dose (complete).
Part 2: Exploration of alternative dosing schedules (complete).
Part 3: Further evaluation of selected dose regimens, including additional response measures to explore effect of ruxolitinib on symptoms and other parameters including daily physical activity and long-term survival (ongoing).
