Endocrine therapy is a form of cancer treatment and is most often involved in breast cancer endocrine therapy. Breast cancer is a hormone-sensitive tumor and its hormesis is related to the occurrence of breast cancer. After breast cancer surgery for radiotherapy and corresponding chemotherapy, if some patients are sensitive to endocrine therapy, they will be given anti-endocrine drugs to treat them. For breast cancer patients with positive hormone expression, endocrine therapy will improve the cure rate and help patients survive. For patients with positive endocrine hormone expression, doctors will recommend endocrine therapy, which is a very good treatment modality, not to say how effective it is, but just one more treatment method than those who cannot receive endocrine therapy, one more treatment method for the same tumor, and better treatment outcome than those who do not have such method.