RecruitingPhase 2Drug trialStudy of Induction PD-1 Blockade in Subjects With Locally Advanced Mismatch Repair Deficient Solid TumorsThe purpose of this study is to find out whether the study drug, TSR-042, followed by standard chemoradiotherapy (the chemotherapy drug capecitabine + radiation therapy) and standard surgery is an effective treatment for advanced dMMR solid tumors. The study will also look at the safety of the study drug.