Tumor markers are normal, usually stomach cancer will not be in advanced stage, in the digestive system, it mainly includes CEA, CA199, and AFP can be checked at the same time, if the patient’s stomach cancer is in early stage or middle stage, usually digestive tumor examination may be normal, such as CEA is normal, CA199 is normal. For stomach cancer, there is no specific tumor index, CEA is mainly for colorectal cancer, including colon cancer and rectal cancer, CA199 is mainly for pancreatic cancer or biliary tract cancer, bile duct cancer and so on, and AFP is mainly for primary liver cancer. If the tumor indicators are elevated before surgery, such as elevated CA199 or CEA, it means that the patient’s gastric cancer may be relatively late, and the tumor itself may be relatively large and deeply infiltrated, which may break through the plasma membrane and invade the pancreas, or lead to metastasis of tumors in other places, and so on.