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1.IntroductionrnPancreatic ductal adenocarcinoma is one of the common pancreatic neoplasms, with extremely high malignancy. The latest statistical data from National Cancer Center of China showed that the incidence of pancreatic cancer had increased dramatically from 2000 t0 2011. In 2015, the incidence of pancreatic cancer in China ranked ninth among malignant tumors, and the mortality rate was the sixth in malignant tumors.