Laboratory tests for digestive system tumors: 1, CA19-9: 93% positive rate for pancreatic cancer patients. 2.CEA: 82% positive rate for pancreatic cancer, 69% positive rate for colon cancer, can be used for staging colon cancer. 3.CA50: the accuracy rate of pancreatic cancer patients is 93%, CA50 should be measured again and can be used as the monitoring index after surgery. 4.CA242: it is a more specific indicator of pancreatic cancer. 5.CA724: a broad-spectrum tumor marker, its elevated serum level can be seen in digestive system tumors, especially gastric cancer. 6.CA125: patients with digestive system tumors will have increased levels. 7, TSGF: a broad-spectrum tumor marker, used in early tumor diagnosis. 8.Pancreatic tumor fetal antigen (POA): a better tumor-related antigen for diagnosing pancreatic cancer. 9.Squamous epithelial carcinoma antigen (SCC): it can be increased in patients with squamous epithelial carcinoma of different organs. 10.Hyaluronic acid (HA): moderate increase in gastric, rectal and other digestive system tumors. 11. Sialic acid (SA): colorectal cancer, gastric cancer, pancreatic cancer can be increased.