Elevated CA724 is commonly seen in conditions such as gastric cancer, non-small cell lung cancer and ovarian tumors, as well as in some normal individuals and in patients with benign gastrointestinal disorders. CA724 is a non-specific tumor marker. CA724 is a non-specific tumor marker, and its level in normal human serum is less than 6.7U/ml; when cancerous lesions occur in tissues, it can rapidly enter the blood, leading to a sharp increase in serum level.CA724 is the most relevant indicator for gastric cancer, and its level is significantly increased in patients with ovarian cancer and non-small cell lung cancer, and it also has a greater reference value for the diagnosis of graded liver and colorectal cancers. As a non-specific tumor marker, its elevation does not confirm the diagnosis of tumor, and its elevation can also be seen in some healthy people or patients with benign gastrointestinal diseases, such as cirrhosis. Although the sensitivity and specificity of CA724 are higher when used alone in the diagnosis of gastric cancer, the diagnostic efficacy of the combined test is still better than that of the individual test. Usually, the combination of CA724 with carcinoembryonic antigen (CEA) and CA199 can improve the specificity and sensitivity of gastric cancer diagnosis, the combination of CA724 with AFP can identify the benign and malignant of ovarian cancer, and the combination of CA724 with carcinoembryonic antigen (CEA) can be helpful to determine the malignant degree and recurrence rate of colorectal cancer.