PTBP1 and gastric adenocarcinoma: To detect the expression of PTBP1 in patients with GC, we used GC tissue microarray (95 cases of survival gastric adenocarcinoma, including 95 cancer sites / 85 paracancer sites) for multiple immunofluorescence staining of PTBP1 and CK (CK staining was used to distinguish epithelial tissues).