Severe COVID-19 in a patient with chronic graft-versus-host disease after hematopoietic stem cell transplant successfully treated with ruxolitinib.

Graft-versus-host disease (GVHD) is a common complication of hematopoietic stem cell transplant, which is known to be mediated by cytotoxic T-cell effectors and dysregulated inflammatory cytokines. Similarly, the lung injury observed in severe COVID-19 cases appears to be related to a massive production of pro-inflammatory cytokines. The selective JAK1/2 inhibitor ruxolitinib has shown promising results in the context of GVHD, and different trials are currently underway in patients with severe COVID-19; nevertheless, no clinical observation of safety or efficacy of treatment with ruxolitinib in this context has been published yet. We describe a first case of severe COVID-19 developed after hematopoietic stem cell transplantation in a patient with a concomitant chronic GVHD (cGVHD), in which a treatment with ruxolitinib was administered with good tolerance and positive outcome.