DFS: disease‐free survival; OS: overall survival; HR: hazard ratio; CI: confidence interval; ECOG PS: Eastern Cooperative Oncology Group Performance Status; CA 19-9: carbohydrate antigen 19-9; CEA: carcinoembryonic antigen; LN: lymph node; ypT: tumor stage; ypN: lymph node stage. Here, CEACAM5 is linked to neoplasm.