More immune dysregulation: Sarcoidosis and chronic graft-versus-host disease after allogeneic stem cell transplant

Approximately 25,000 allogeneic hematopoietic stem cell transplants (HSCTs) are performed annually. Cutaneous complications are common and include a spectrum of acute and chronic graft-versus-host disease (GVHD). Mechanisms implicated in the rare development of sarcoidosis after HSCT include specific pretransplant conditioning regimens, possible donor-to-recipient transmission, genetic predisposition of sarcoidosis, and post-HSCT immune dysregulation.