RESUMEN
Breast-conserving surgery (BCS) has become the most common treatment for breast ductal carcinoma in situ (DCIS).BCS followed by radiotherapy (RT) can reduce the risk of recurrence.However,controversy exists regarding the region of RT,which low-risk patients can avoid RT after BCS,and the role of accelerated partial breast irradiation (APBI) in the treatment of BCS.However,most trials have indicated that all DCIS patients can obtain benefit from RT after BCS.Further prospective studies are warranted to identify whether RT can be safely omitted for low-risk patients with DCIS.Long-term results of ongoing studies on outcome of BCS alone suggest that RT should be routinely recommended after BCS for all patients except those with contraindication.