Breast cancer chemotherapy includes neoadjuvant chemotherapy, adjuvant chemotherapy, palliative chemotherapy, etc. The effect of chemotherapy can be evaluated after chemotherapy by integrating various factors, such as CT, MRI, tumor markers and other tests, and generally chemotherapy can achieve the effect of controlling the tumor. 1. Neoadjuvant chemotherapy: Neoadjuvant chemotherapy is the systemic chemotherapy before local treatment (surgery or radiotherapy), the purpose is to make the tumor shrink through chemotherapy, and then cure the tumor through surgery or radiotherapy, etc. Patients who actively accept neoadjuvant chemotherapy from doctors will see obvious treatment effect. 2. Adjuvant chemotherapy: adjuvant chemotherapy refers to systemic chemotherapy after surgery, which aims at killing the tiny lesions that cannot be eliminated by surgery, simplifying the metastasis and recurrence of cancer lesions, and improving the survival rate of patients. If breast cancer belongs to middle or early stage, the effect of chemotherapy will be more obvious. If breast cancer belongs to middle or late stage, the effect of chemotherapy is not particularly obvious. 3. Palliative chemotherapy: the treatment of breast cancer patients is mainly based on chemotherapy, breast cancer is more sensitive to chemotherapy, and some advanced breast cancer patients can effectively control the disease by receiving systematic chemotherapy. It is recommended that breast cancer patients go to the hospital in time, doctors will combine the specific conditions of the patients to develop appropriate chemotherapy program, and can be integrated with CT, MRI, tumor markers and other tests to evaluate the efficacy of the treatment.