Chemotherapy is a treatment that uses chemically synthesized drugs to kill tumor cells and inhibit their growth. The process of chemotherapy can be divided into four stages, i.e. before chemotherapy, during chemotherapy, after chemotherapy and end of chemotherapy. 1. Before chemotherapy: Doctors stage the tumor patient according to all the examination results and evaluate whether the patient is suitable for chemotherapy in combination with the patient’s current physical condition. If the physical condition permits, individualized optimal chemotherapy plan will be given, and the family will be informed of the role of chemotherapy as well as the adverse effects, and the informed consent for chemotherapy will be signed. 2. During chemotherapy: During chemotherapy, patients need to follow the chemotherapy regimen for intravenous infusion or oral administration of chemotherapy drugs. Adverse reactions such as hand numbness and nausea may occur during chemotherapy, and if the adverse reactions are serious, the patient needs to notify the doctor in time. 3. After chemotherapy: After a cycle of chemotherapy is completed and the patient is discharged from the hospital, it is usually necessary to wait a few days before being admitted to the hospital for the next cycle of chemotherapy. During the period of discharge from the hospital, regular blood tests should be conducted to closely observe the physical condition and check whether there are any abnormalities in the blood routine and liver and kidney functions. If any abnormality is found or if the patient has serious adverse reactions, he/she needs to seek medical treatment in time. 4. End of chemotherapy: Doctors will assess the condition according to the efficacy of chemotherapy, and further treatment or regular review will be conducted to control the recurrence and metastasis of tumor cells.