Pancreatic cancer in a broad sense includes pancreatic ductal adenocarcinoma, pancreatic cystic adenocarcinoma, malignant neuroendocrine tumors, intraductal papillary mucinous carcinoma of the pancreas, and metastatic carcinoma of the pancreas; pancreatic cancer in a narrow sense mainly refers to pancreatic ductal adenocarcinoma. Different types of pancreatic cancer have different biological characteristics, and the survival time of patients also varies. Several common types of pancreatic cancer: 1. Ductal adenocarcinoma of the pancreas: it accounts for more than 90% of pancreatic cancer and is more common in men over 50 years old, with no significant difference between male and female ratio. Ductal adenocarcinoma is composed of glands that resemble the normal pancreatic duct structure, and the tumor is largely solid, grayish or grayish yellow, hard, and with unclear borders with surrounding tissues. Tumors in the head of the pancreas are often 2-5 cm in size, and hemorrhage, necrosis and cystic changes are rare. Tumors in the body and tail of the pancreas are relatively large, with a maximum diameter of 7 cm, and cystic changes are more common. Adenocarcinoma of the duct is more common with high and intermediate differentiation. 2. Cystic adenocarcinoma of the pancreas: It is more common in women and is more common in the body and tail of the pancreas. Histologically, the tumor is covered with columnar or cuboidal epithelium, and the tumor cells protrude into the cystic cavity in a papillary proliferation. Cystic adenocarcinoma is most often the result of malignant transformation of cystic adenoma, and both migrating patterns are seen in pathological sections. The prognosis of this tumor is better than that of ductal adenocarcinoma. 3.Intraductal papillary mucinous carcinoma: Intraductal papillary mucinous tumor of the pancreas is diagnosed as intraductal papillary mucinous carcinoma if the cells have heterogeneity and infiltrative growth. This tumor is rare and has a relatively good prognosis. 4.Solid pseudopapillary carcinoma: Solid pseudopapillary tumors of the pancreas are mostly seen in young women and most of them are benign. If solid pseudopapillary tumors infiltrate into surrounding tissues or have distant metastases, they are considered malignant, i.e. solid pseudopapillary carcinoma. It is very rare. Adenoid cell carcinoma: The peak of incidence is 50-70 years old, and the ratio of male to female is 2:1. Adenoid cell carcinoma can occur in any part of the pancreas, and the tumor is brownish yellow lobulated and can be seen to infiltrate and grow into the surrounding tissues, which can be accompanied by necrosis. The prognosis of patients with this tumor is poor, with a 5-year survival rate of less than 10%. 6.Metastatic cancer of the pancreas: Common malignant tumors metastasizing to the pancreas are lymphoma, kidney cancer, melanoma, breast cancer, lung cancer, colorectal cancer, stomach cancer, etc. The prognosis is related to the primary tumor. The prognosis is related to the primary tumor, and when the pancreas is involved, it is usually at an advanced stage with poor prognosis.