To investigate the molecular mechanisms of the regulation of peritoneal fibrosis by XBP1s, we also detected another important inflammatory marker of macrophages, F4/8028, and the vascular endothelial cell marker CD31, which is a marker of angiogenesis in the process of peritoneal inflammation and fibrosis22,23, in peritoneal mesothelial cells. This evidence concerns the gene PECAM1 and Peritoneal Fibrosis.