PSMD1 and metastatic malignant neoplasm in the lymph nodes: Univariate analysis revealed that preoperative CA19-9 value > 120 U/mL, CAR > 0.085, BR status, preoperative chemotherapy, pancreatic head cancer, pathological T3, lymph node metastases, poorly differentiated adenocarcinoma, postoperative CA19-9 value > 120 U/mL, initial dose of S-1 of 80 mg/day, low TDI, and recurrence were associated with poor OS.