Methemoglobinemia Secondary to Clofazimine Treatment for Chronic Graft-Versus-Host Disease

To the Editor: Chronic graft-versus-host disease (cGVHD) is a frequent late complication of allogeneic bone marrow transplantation (allo-BMT), affecting 20% to 50% of long-term transplant survivors.[1][1]A wide combination of agents have been used as primary therapy for extensive cGVHD,[2][2] [3][3