Bomedemstat (IMG-7289) Plus Ruxolitinib for Myelofibrosis

Bomedemstat will be self-administered orally once daily. In both cohorts, the dose of bomedemstat will be adjusted in each patient based on titration of the patient's platelet count to the target range. Ruxolitinib will be self-administered orally. Both medications will continue uninterrupted in 28-day cycles. Subjects will continue combination treatment through the Initial Treatment Period (first 6 cycles), which includes a Qualification Assessment. Those deriving clinical benefit in the opinion of the treating physician may continue receiving combination treatment in the Additional Treatment Period (6 cycles). Qualification Assessments will be performed at the end of each Additional Treatment Period, which is iterative, and may repeat for as long as clinical benefit is sustained, at the discretion of the treating physician.