Inclusion Criteria:  Age ≥ 18 years old; It was diagnosed as pancreatic cancer by clinical manifestations, laboratory examination indexes, and pathology, and then surgically removed; Agree to participate in this study and sign an informed consent form;  Exclusion Criteria:  All kinds of acute or chronic inflammation, infectious diseases and blood system diseases; Metastasis of tumors in other parts; Benign pancreatic diseases such as chronic pancreatitis and autoimmune pancreatitis; Periampullary tumors without pancreatic cancer; Suspicious pancreatic cancer patients who cannot be diagnosed; Refuse to follow up.