Tumor-associated antigen-724 generally refers to glycoantigen-724, which is a relatively non-specific tumor marker and may be elevated in gastric cancer, and may also be elevated in other gastrointestinal malignancies, such as colon cancer and rectal cancer. If the CA-724 is higher than the normal reference value by tens or even hundreds of times, it indicates the possibility of gastric cancer, and further gastroscopy is needed to confirm the diagnosis. Tumor markers are only for reference, but the diagnosis of cancer depends on imaging examinations, such as CT and MRI, and gastroscopy or colonoscopy must be done for cavity organs, and then further pathology can be taken to confirm the diagnosis.