The life expectancy of a person undergoing chemotherapy is related to a number of factors such as the physical quality of the individual, the type of disease and the severity of the disease, and cannot be inferred purely. For patients with better physical quality, lower malignant degree and in the early stage of cancer, chemotherapy can significantly prolong the survival time or even cure the disease; for patients with poor physical quality, high malignant degree and systemic metastasis, chemotherapy can be used as a kind of palliative treatment to improve the quality of life of patients. After chemotherapy, it can effectively inhibit the growth rate of the tumor, shrink the tumor foci, improve the quality of life and prolong the survival time of the patients, significantly improve the prognosis of the disease, and reduce the discomfort of the patients. Clinically commonly used chemotherapy drugs include cisplatin, cytarabine, paclitaxel, fluorouracil, cyclophosphamide, etc. As there is no absolute most effective drug, you need to choose the most suitable treatment plan for yourself under the advice of the doctor, the drug has an adverse reaction to timely medical treatment, drug allergy is prohibited.