The recurrence rate and efficacy of breast-conserving combined radiotherapy and total mastectomy are similar, with clinical data showing that the recurrence rate of both breast-conserving combined radiotherapy and total mastectomy is about 7%. If the disease is at an early stage, the recurrence rate is even lower. The recurrence rate varies from patient to patient, such as patients with genetic mutations, patients with multicentric lesions, and patients with family history of breast cancer. Breast-conserving and total mastectomy have similar recurrence rates and survival, but breast-conserving patients have a relatively higher quality of life. Traditional breast cancer treatment removes the entire breast and also requires removal of the pectoralis major and pectoralis minor muscles. With the development of breast cancer awareness and medicine, as well as the enhancement of comprehensive treatments such as drugs and radiotherapy, it was gradually found that local treatment modalities did not affect patients’ survival, so breast-conserving treatment was produced. Breast-conserving treatment is defined as a clean local tumor excision with no tumor cells visible at the margin under microscope, and radiotherapy is required after surgery.