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. 2013 Aug;141(1):145-54.
doi: 10.1007/s10549-013-2670-3. Epub 2013 Aug 25.

Disease-free survival by treatment after a DCIS diagnosis in a population-based cohort study

Brian L Sprague  1 , Vicki McLaughlin, John M Hampton, Polly A Newcomb, Amy Trentham-Dietz
Affiliations

Disease-free survival by treatment after a DCIS diagnosis in a population-based cohort study

Brian L Sprague et al. Breast Cancer Res Treat. 2013 Aug.

Abstract

Randomized trials have demonstrated the efficacy of radiation and tamoxifen in reducing risk of second events after breast-conserving surgery (BCS) for ductal carcinoma in situ (DCIS), but the comparative effectiveness of mastectomy, BCS, and adjuvant treatments have not been established in community practice. We examined disease-free survival (DFS) among 1,676 DCIS cases diagnosed during 1995-2006 in the population-based Wisconsin In Situ Cohort study. Information on patient and tumor characteristics, treatments, and second breast cancer events were collected via a comprehensive review of data from patient interviews, the statewide cancer registry, and pathology reports. Breast cancer DFS was evaluated according to treatment while adjusting for patient and tumor characteristics. After an average of 7.1 years of follow-up, 143 second breast cancer events occurred. Overall 5-year DFS was similar among women treated with ipsilateral mastectomy (95.6 %; 95 % CI 93.5-97.0) compared to women treated with BCS and radiation (94.8 %; 95 % CI 92.8-96.1), though women receiving BCS without radiation experienced poorer overall DFS (87.0 %; 95 % CI 80.6-91.5). Women treated with tamoxifen in addition to BCS and radiation had a similar risk of a second breast event, although the hazard ratio (HR) suggested a potential benefit (0.70, 95% CI 0.41-1.19). Women treated with BCS, radiation, and tamoxifen had comparable risk of a second event as those treated with ipsilateral mastectomy (HR = 1.20; 95 % CI 0.71-2.02). In this population-based sample, the use of BCS with radiation and tamoxifen resulted in high DFS rates comparable to those achieved by ipsilateral mastectomy.

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Conflict of interest statement

DISCLOSURES

The authors declare that they have no conflict of interest.

Figures

FIGURE 1
FIGURE 1
Flowchart of recruitment and exclusions for the study population, Wisconsin DCIS cases, 1995–2006.
FIGURE 2
FIGURE 2
Surgical treatment, radiation, and tamoxifen use by year of diagnosis, Wisconsin DCIS cases (N=1,676), 1995–2006.
FIGURE 3
FIGURE 3
(A) Overall disease-free survival with 95% confidence bands and (B) disease-free survival by treatment type, Wisconsin DCIS cases (N=1,676), 1995–2010.
See this image and copyright information in PMC

References

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