Vedolizumab, an immunosuppressive drug that acts locally on the gastrointestinal tract, is mainly used for the treatment of inflammatory bowel disease, and has been reported to be effective against gastrointestinal acute graft-versus-host disease (GI-aGVHD) in adults. However, there is insufficient evidence for pediatric GI-aGVHD. We used vedolizumab to treat three cases of GI-aGVHD in patients aged 1.5-4.4 years. It was significantly effective in two patients and did not cause serious side effects in any patient. Vedolizumab might be effective and safe for pediatric GI-aGVHD refractory to other treatments, but this must be confirmed in future studies.
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