Tumor markers are chemical substances that reflect the presence of tumors, and their content in normal human blood or tissues is small, while the content in malignant tumor tissues is relatively high. At present, there are several clinical tests, and the normal reference values of each hospital are slightly different due to different reagents and testing methods, Gastrointestinal cancer, hepatobiliary tract tumor 4.glycoconjugate antigen 15-3 (CA15-3): breast cancer 5.glycoconjugate antigen 12-5 (CA12-5): ovarian cancer 6.β2-microglobulin (β2-MG): Hodgkin’s disease, lymphoma, multiple myeloma 7.prostate-specific antigen (PSA): prostate cancer, bladder cancer