[Ductal carcinoma in situ treated with radiation therapy and additional boost].

PURPOSE: Women with ductal carcinoma in situ are treated with breast-conserving surgery and radiation therapy. The impact of an additive boost radiation is under evaluation.

PATIENTS AND METHODS: All women treated for ductal carcinoma in situ with breast-conserving surgery and whole breast radiation therapy at a total dose of 45Gy with a boost radiation from 1990 to 2008 have been included in this retrospective monocentric retrospective study.

RESULTS: We included 171 patients. Boost radiation to the surgical bed was delivered by brachytherapy in 66 patients (39%), by direct en-face electron beam in 86 patients (50%), and by tangential fields using photon beams in 19 patients (11%). Median follow-up was 95.1months. Eight local relapses (4.6%) have occurred. The 10-year local recurrence-free survival rate was 97%. The 10-year overall survival rate was 98%. On multivariable analysis, brachytherapy (P=0.05; HR=5.15; IC=1-26.3) was associated with a reduction risk of local recurrence-free survival.

CONCLUSION: In our experience, women treated for a ductal carcinoma in situ with breast-conserving surgery and whole breast radiation therapy with a boost radiation have a high 10-year local recurrence-free survival rate.