It is not meaningful for breast cancer patients to have chemotherapy only once, which is not useful. Breast cancer is one of the common malignant tumor diseases, often manifested as breast lumps, enlarged axillary lymph nodes, etc. In the clinic, it is mainly treated by adopting surgery, radiotherapy, targeted drugs and immune drugs for comprehensive treatment of the disease. Chemotherapy is a commonly used treatment method, which needs to choose different programs according to the patient’s condition, and the number of cycles of different chemotherapy programs will be different, usually 4~8 cycles, so that the concentration of chemotherapy drugs in the body reaches the peak of treatment and kills the tumor cells as much as possible. Therefore, only one chemotherapy treatment for breast cancer cannot achieve the therapeutic effect, and it is recommended to strictly follow the doctor’s instructions to carry out chemotherapy, so as to prevent further development and deterioration of the condition.