Belumosudil for the Pre-emptive Treatment of Patients With Chronic Graft Versus Host Disease

OUTLINE: Patients are randomized to 1 of 2 arms. ARM I: Patients receive belumosudil orally (PO) daily (QD) or twice daily (BID) if taken with strong CYP3A inducers or proton pump inhibitors for days 1 through 28 of each cycle. Cycles repeat every 28 days for a total of 11 cycles, followed by one cycle of tapering prior to discontinuation, in the absence of disease progression or unacceptable toxicity. ARM II: Patients receive a placebo PO QD or BID if taken with strong CYP3A inducers or proton pump inhibitors for days 1 through 28 of each cycle. Cycles repeat every 28 days for a total of 11 cycles, followed by one cycle of tapering prior to discontinuation, in the absence of disease progression or unacceptable toxicity. Patients undergo blood sample collection on study. After completion of study treatment, patients are followed up at 30 days, at 60 days if 12 cycles are completed, and then up to 18 months.