Belumosudil and Rituximab for Primary Treatment of Chronic Graft-Versus-Host-Disease

Inclusion Criteria: * First episode of systemic immunosuppression-requiring cGVHD, defined as classic cGVHD by the NIH consensus criteria (without features or characteristics of aGVHD) * Previously untreated, defined by having received \<10 days of corticosteroids or alternative systemic immunosuppressive agent started specifically for a new diagnosis of cGVHD * KPS \>/= 70% * Adequate hematologic function independent of platelet transfusion and G-CSF for at least 7 days prior to study entry: ANC \>750 cells/mm3; Platelets \>30,000 cells/mm# Exclusion Criteria: * Late persistent or recurrent aGVHD * Active uncontrolled infection * History of HIV infection * Active HBV or HCV infection. Subjects who are positive for hepatitis B core antibody, hepatitis B surface antigen, or hepatitis C antibody must have a negative PCR result before enrollment. Those who are PCR positive will be excluded. * Calculated CrCl \<30mL/min * AST and/or ALT \>5x ULN or direct bilirubin \>3x ULN * Cardiac ejection fraction \<40% or history of uncontrolled cardiac arrhythmias * Has received more than one allogeneic transplant prior to the occurrence of cGVHD