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  • Title: Ductal carcinoma in situ (DCIS) treated by mastectomy, or local excision with or without radiotherapy: A monocentric, retrospective study of 608 women.
    Author: Frank S, Dupont A, Teixeira L, Porcher R, De Roquancourt A, Giacchetti S, Espié M, Cuvier C.
    Journal: Breast; 2016 Feb; 25():51-6. PubMed ID: 26573444.
    Abstract:
    OBJECTIVES: Since mammographic screening programmes, the proportion of DCIS has dramatically increased. Adjuvant radiotherapy (RT) after local excision (LE) has become a solid option for DCIS since 4 randomised trials have proven a decrease in local relapse (LR), though failing to prove a benefit on mortality rate. DCIS is a heterogeneous disease and it is unclear whether all patients uniformly benefit from radiotherapy. We report a descriptive analysis including all types of treatment. MATERIALS AND METHODS: Our retrospective cohort describes 608 women treated for DCIS in our centre between 1983 and 2013. Mastectomy was recommended before 1992, or for multifocal or >3 cm DCIS. LE alone was an option for DCIS ≤10 mm, with low or intermediate grade, and clear margins (≥2 mm). LE + RT was recommended for all other cases. RESULTS: The median follow-up time was 6.7 years. Treatment consisted in mastectomy for 252 women, LE + RT for 269 and LE for 86. The major prognosis factor for LR rate was the type of treatment: LE + RT or LE was associated with a higher LR-rate than those treated by mastectomy (HR respectively 2.06; 95%CI 1.33-3.19; p = 0.001 and 2.12; 95%CI 1.20-3.65; p = 0.007). In our selected population, women treated by LE + RT versus LE showed no significant differences in LR (HR 0.97; 95%CI 0.61-1.7; p = 0.91). The overall survival rate was 99.7% after ten years, with no differences between the treatment groups. CONCLUSION: Although retrospective, our monocentric study suggests that LE alone could be an option for DCIS with good prognosis factors. Confirmation by larger randomised studies is needed.
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