1.What is the timing of postoperative radiotherapy for breast cancer? Evidence-based evidence shows that there is no significant difference in the benefit rate between chemotherapy-radiotherapy-chemotherapy and radiotherapy after the completion of chemotherapy, therefore, radiotherapy is recommended after the completion of chemotherapy. Is radiotherapy to the lymph nodes in the internal breast area necessary? The indications of radiotherapy for breast cancer are mainly based on the size of the primary tumor lesion, axillary lymph node metastasis and surgical margins, and are not related to the location of the primary tumor lesion. The participants all expressed that the content of such lectures and discussions is close to the clinic and has important guiding significance for clinical work.