Tumor markers, also known as tumor markers, can reflect the occurrence and development of tumors and monitor the response of tumors to treatment, and a decrease in tumor markers proves that chemotherapy is effective. Tumor markers can be used for early detection of tumors; tumor census and screening; monitoring the efficacy of surgery, chemotherapy and radiotherapy for tumor patients; indicators of tumor recurrence; and prognosis judgment of tumors. For example, alpha-fetoprotein is a common test item for diagnosing primary liver cancer. When after surgical resection, radiotherapy and chemotherapy, if the alpha-fetoprotein content decreases, it proves that the treatment is effective. If the tumor marker is elevated, the treatment fails to effectively control the progression of the disease. To detect whether the tumor is effectively controlled, it is necessary to combine with ultrasound, CT and other examinations to make it clear that the tumor needs to be regularly rechecked after treatment.