The biochemical properties of tumor cells and their metabolism are abnormal, so the substances that are qualitatively or quantitatively changed in the body fluids, excretions and tissues of tumor patients are tumor markers. Tumor markers are mainly used clinically for the discovery of primary tumors, the screening of high-risk groups of tumors, the differential diagnosis of benign and malignant tumors, the judgment of the degree of tumor development, the observation and evaluation of tumor treatment effects, and the prediction of tumor recurrence and prognosis, etc. .
