RecruitingPhase 2Drug trialPembrolizumab and Hypofractionated Radiation Therapy for the Treatment of Mucosal MelanomaThis is an open-label, single center, one cohort, non-randomized, phase II study. The aim is to evaluate the efficacy and safety of the combination of hypofractionated radiotherapy (HRT) and pembrolizumab on local tumor control in mucosal melanoma patients. Treatment effect will be compared with historical radiation therapy-alone control data.