Vedolizumab for pediatric patients with gastrointestinal acute graft-versus-host-disease.

Vedolizumab, an anti-α4β7 integrin monoclonal antibody, impairs homing of T-cells to the gastrointestinal (GI) endothelium and acts as a gut-selective anti-inflammatory agent. Recent reports of the efficacy of vedolizumab in treating lower GI acute graft-versus-host disease (aGVHD) are promising, but experience in children is scarce. We present a cohort of 13 pediatric patients who were treated with vedolizumab for GI aGVHD. Ten of the patients were treated for steroid-refractory disease, out of which, six suffered from severe (stage 3 or 4) GI disease before the first dose of vedolizumab. In the other three patients, vedolizumab was introduced early in the disease course. Median time between GI GVHD onset to vedolizumab treatment was 23 days (range 7-59 days), with a median of 3 doses (range 1-5) per patient. GI GVHD staging was evaluated at various time points after the first vedolizumab dose, showing improvement in nine of the 13 patients. After a median follow-up time of 13 months (range 6-34 months), eight patients completely recovered, two had ongoing chronic colitis, and three patients died. During the vedolizumab treatment period, 38 infectious episodes were noted, most of them GI related. The unique activity profile of vedolizumab makes it an appealing treatment option for lower GI aGVHD, but caution for concurrent infections is warranted.