After breast-conserving surgery, it is necessary to pay attention to regular review as well as postoperative radiotherapy and chemotherapy. 1. Regular review to check whether the malignant tumor recurs and metastasizes. Observe whether the specific tumor indexes increase, and check whether the locations where the cancer is prone to recurrence and metastasis, such as bilateral axilla, contralateral breast and neck lymph nodes appear enlarged. In about six months to one year after surgery, consider PET-CT for further examination. 2. Chemotherapy, like radical surgery, is necessary for breast-conserving surgery when the patient is at high risk of recurrence and metastasis. 3. At the same time, breast-conserving patients must also undergo postoperative radiotherapy. The effect of breast-conserving surgery is effectively ensured by eliminating the residual cancer cells that may be left behind by the surgery and preventing the recurrence and metastasis of the cancer through radiotherapy. Therefore, patients after breast-conserving surgery should strictly follow the doctor’s instructions for treatment.