RecruitingPhase 2Drug trialSintilimab, Bevacizumab, Pemetrexed, and Cisplatin for Unresectable MPeMTo explore the efficacy and safety of sintilimab, bevacizumab combined with pemetrexed and cisplatin in the treatment of malignant peritoneal mesothelioma, and to explore the biomarkers related to efficacy or safety.