Invasive breast cancer is defined as invasive breast cancer. Breast-conserving surgery for invasive breast cancer needs to be supplemented with radiotherapy. The aim of breast-conserving surgery for invasive breast cancer is mainly the complete removal of the mass, and this method is more suitable for patients with clinical stage I or II breast cancer who have appropriate breast volume and who can maintain the cosmetic effect after surgery. It is contraindicated for those who are unable to obtain negative margins. When the cancer cells are not yet significantly dispersed, probably in the in situ stage, chemotherapy is generally not needed after surgery. However, it must be supplemented with radiotherapy. It can reduce the local recurrence rate and can improve the overall survival rate. After the surgery, it is necessary to take into account the physical condition and the speed of development of the disease, and of course, various factors, and the professional doctor will decide whether it is necessary to take further therapeutic measures.