Blood test contains many items, such as routine blood test, tumor marker test, etc., which have certain significance in evaluating cancer, but whether it is cancerous or not should be evaluated according to the clinical and imaging examination, pathology delivery and other comprehensive assessment. For example, one of the tumor marker tests, alpha-fetoprotein AFP is a specific marker for diagnosing hepatocellular carcinoma and widely used in liver cancer screening and diagnosis, carcinoembryonic antigen CEA is a marker for pancreatic cancer, gastric cancer and other digestive system tumors, and glycoantigen CA199 is a marker for ovarian and fallopian tube cancers, which are of some significance in the assessment of the above cancers. In addition, routine blood tests also have certain significance. If there are abnormalities in the data indicators of red blood cells, white blood cells, platelets, etc., it may indicate the risk of certain cancers, and then it is necessary to consult a doctor in time to take further tests in order to make clear whether one is suffering from cancer or not. Simply relying on blood test cannot check whether you are suffering from cancer or not, but can only have certain significance in the assessment of cancer. When abnormal data appear, you need to consult a doctor in time, and further find out through imaging examination or pathological examination, etc., and take active treatment, so as to avoid delaying your condition.