Breast cancer is one of the most common types of malignant tumors in women, and very few men may have it as well. Regardless of the type of breast cancer, there is a possibility of recurrence and there is no guarantee that it will not recur. Breast cancer in situ is the best treated breast cancer, with a 10-year survival rate that can reach more than 95%, but there are rare cases that recur again after 5-10 years. Adjuvant radiotherapy, chemotherapy and other comprehensive treatments can be considered. For other types of breast cancer, depending on the nature of the pathology and the stage, postoperative treatment with adjuvant chemotherapy, radiotherapy, endocrine therapy, and targeted drugs is needed. Breast cancer is also a systemic disease, and surgery alone is not enough. Postoperative systemic treatment and comprehensive treatment are very important, and early detection and early treatment can also improve the survival rate.