1.Does radiotherapy have to be done after breast-conserving surgery and how much can radiotherapy reduce the possibility of recurrence? A: Except for rare and exceptional cases, radiotherapy should be done after breast-conserving surgery. Vinh-Hung et al. conducted a meta-analysis of 9422 cases and concluded that the risk of recurrence after breast-conserving surgery without radiotherapy is three times higher than that of radiotherapy, and a meta-analysis of 10 randomized group studies in 2005 showed that the 5-year recurrence rate after breast-conserving surgery without radiotherapy was 25.9%, and that of the radiotherapy group was 7.3%. 2.Should we do radiotherapy or chemotherapy first after breast-conserving surgery? A: The current study shows that the order of radiotherapy and chemotherapy after breast-conserving surgery for early-stage breast cancer has no significant effect on the efficacy. However, for patients who do not have clean surgical margins, the order of radiotherapy first and then chemotherapy should be preferred. Based on the fact that chemotherapy is more common after breast-conserving surgery, it is especially important to remind you that radiotherapy should be started within 6 months after surgery. 3.How long does radiotherapy take after breast-conserving surgery? What is the cost? A: Regardless of the type of radiotherapy used, the time required is about 6 weeks. The cost varies depending on the type of radiation therapy: the cost of general radiation therapy should not exceed 10,000 RMB and is covered by medical insurance. The cost of conformal intensity modulated therapy (precision radiotherapy) should be 30,000 or more, and there are items not covered by medical insurance. 4.Should I use intensity-modulated radiation therapy after breast-conserving surgery? A: If economic conditions allow, intensity-modulated therapy should be considered. Intensity-modulated radiation therapy after breast-conserving surgery for breast cancer is a treatment technique that has become more and more widely used in recent years. It has been reported that intensity-modulated radiation therapy for left-sided breast cancer reduces the irradiation range of the coronary artery by 25% compared with conventional radiation therapy, the range of the ipsilateral lung receiving >46Gy by 31%, and the irradiation dose of the contralateral breast by 42%. Moreover, the dose uniformity in the upper and lower part of the breast target area was significantly improved. Therefore, the efficacy of the treatment can be guaranteed while reducing the occurrence of related adverse effects. 5.What parts of the breast will be irradiated after breast-conserving radiation therapy? A: The breast and chest wall of the affected side should be irradiated during radiation therapy after breast-conserving surgery. The irradiation of the supraclavicular area depends on whether there is metastasis in the axillary lymph nodes. For axillary lymph node metastases greater than or equal to 4, the supraclavicular region must be irradiated; for axillary lymph node metastases 1-3, the supraclavicular region is recommended; for axillary lymph nodes without metastases, the supraclavicular region does not need to be irradiated. If there is no metastasis in the internal breast lymph nodes, it is usually not necessary to irradiate this area.