Randomized clinical trials have demonstrated that the recurrence of DCIS is low and most of the recurrence occurs around the tumor bed. Besides, cosmetic outcomes are reported better in partial breast irradiation group compared to whole breast irradiation group. However, whether or not partial breast irradiation is safety in DCIS is still unknown. The purpose of this study is to evaluate the feasibility and safety of partial breast irradiation for low risk DCIS after breast-conserving surgery.
