A Phase 3, Randomized, Double-Blind, Placebo-Controlled Study of Axatilimab and Corticosteroids as Initial Treatment for Chronic Graft-Versus-Host Disease (AXemplify-357)

Inclusion Criteria: * ≥ 12 years of age at the time of informed consent. * New-onset moderate or severe cGVHD, as defined by the 2014 NIH Consensus Development Project Criteria for Clinical Trials in cGVHD, requiring systemic therapy. * History of allo-HCT from any donor HLA type (related or unrelated donor with any degree of HLA matching) using any graft source (bone marrow, peripheral blood stem cells, or cord blood). Recipients of myeloablative, nonmyeloablative, or reduced-intensity conditioning are eligible. * Adequate hematologic function with ANC ≥ 0.5 × 109/L independent of growth fac…