Chemotherapy, as the cornerstone of tumor treatment, began in the 1940s. In the following decades, a large number of chemotherapeutic drugs came out one after another. Through the continuous screening of animal experiments and clinical practice, a relatively mature chemotherapeutic regimen and dose were gradually formed, which were widely used in the treatment of tumors. Chemotherapy is helpful to improve DFS and / or 0s. Even in the era of targeted therapy and immunotherapy, chemotherapy is still the middle stream of tumor treatment