A case of sclerodermatous graft-versus-host disease responsive to imatinib therapy.

Sclerodermatous graft-versus-host disease (sGVHD) is a rare, late complication of hematopoietic cell transplantation. Classified as a variant of chronic graft-versus-host disease, sGVHD is thought to be predominantly an immune-mediated response characterized by aberrant T-cell function and dysregulation of tyrosine kinase cascades. Recently, the profibrotic cytokine transforming growth factor B and stimulatory autoantibodies against the platelet-derived growth factor receptor have been implicated in the pathogenesis of sGVHD. Treatment of sGVHD remains disappointing and largely limited by systemic side effects. Imatinib mesylate is a small molecule tyrosine kinase inhibitor that has been shown to selectively inhibit both the platelet-derived growth factor receptor and transforming growth factor-β signaling pathways. We report a case of sGVHD in a pediatric patient that was resistant to traditional therapy but showed improvement in cutaneous symptoms following daily treatment with 400 mg of imatinib mesylate. Due to its favorable side-effect profile, specificity for molecular pathways deranged in sGVHD and proven efficacy in other sclerodermoid diseases, imatinib mesylate is a promising new tool in the management of this challenging disease.