Whether a patient with breast cancer needs chemotherapy after surgery needs to be judged by the results of the patient’s breast cancer stage and molecular typing. For early-stage breast cancer patients, chemotherapy can be left out, but for patients with progressive breast cancer, that is, intermediate or advanced breast cancer, the next step of treatment is required. If the receptors for estrogen and progesterone are positive, endocrine therapy is usually the treatment of choice, and if some other findings are present, chemotherapy is required, including triple-negative breast cancer, which requires chemotherapy. Chemotherapy is a drug that can kill the cancer cells that may remain in the body, in order to effectively prevent the recurrence or metastasis of the tumor after surgery.