Diarrhoea in a patient with metastatic melanoma: Ipilimumab ileocolitis treated with infliximab.

Administration of ipilimumab, a cytotoxic T-lymphocyte associated antigen-4-blocking monoclonal antibody, leads to enhancement of the anti-tumor T-cell respons and as a result shows a significant survival benefit in metastatic melanoma patients. Therefore patients are currently receiving this promising therapy as a second-line strategy. Unfortunately, by activation of the T-cell immune response, ipilimumab therapy may lead to an unwanted induction of different autoimmune phenomena. Diarrhoea and colitis occur in up to one third of patients. Here we present a case of ipilimumab induced ileocolitis which was successfully treated with infliximab, an anti-tumor necrosis factor monoclonal antibody, after corticosteroid therapy failure. Although formal trials are lacking, recently publicated series suggest that infusional therapy of infliximab is effective in ipilimumab induced ileocolitis.