Pancreatic cancer is a malignant neoplasm of the digestive system. The incidence has increased and it is now the 10th most prevalent malignant tumor worldwide [1–3]. The median survival time of pancreatic cancer patients is 3–6 months and the 5-year survival rate is less than 5%. Because pancreatic cancer does not exhibit obvious clinical symptoms in the early stages, it is frequently diagnosed at a late stage (85% of patients) when surgical treatment is no longer effective . Therefore, adjuvant therapy (particularly radiotherapy and chemotherapy) is critical for management.