Adjuvant Chemoradiotherapy Versus Chemotherapy for Pancreatic Cancer (ADJUPANC)

Inclusion Criteria: * Aged 18-75 years * Pathologically confirmed pancreatic ductal adenocarcinoma * Pathologically confirmed lymph node metastasis, R1 or R2 resection or lymphovascular invasion (one of the risk factors) * No history of cancer treatment after surgical resection * No disease progression confirmed by imaging examinations * ECOG 0 to1 point * No abnormality in blood routine test, liver and kidney function test and coagulation test (White blood cell count ≥4.0×10\^9/L, neutrophil count ≥2.0×10\^9, hemoglobin level ≥100g/L, platelet count ≥100×10\^9/L, ALT and AST level \< 2.5 times the upper limit of normal, total bilirubin and creatinine level within the normal, international normalized ratio \<2) Exclusion Criteria: * History of cancer treatment after surgical resection * History of other cancers within 5 years * Disease progression, including local pprogression or metastasis, confirmed by imaging examinations * ECOG ≥2 points * Significant abnormality in blood routine test, liver and kidney function test and coagulation test * Active inflammatory bowel disease * Gastrointestinal bleeding or perforation within 6 months * Infections requiring antibiotics * Heart or respirotory insufficiency * Pregnant women or breastfeeding women