Abstract
Background
Successful breast-conserving therapy in DCIS is restricted by high rates of residual disease resulting in the need for radiotherapy and/or re-excision. This study identifies patients with DCIS who are most at risk of compromised margins and of residual disease.
Methods
All patients undergoing breast-conserving surgery for DCIS over a 6-year period were included. Method of diagnosis, mammographic size, pathological size, DCIS-margin distance and residual disease on re-excision were analysed.
Results
One hundred and thirty-five patients underwent initial breast-conserving surgery for DCIS. The compromised margin rate was 72%, and the rate of residual disease on re-operation was 54%. On univariate analysis, underestimation of pathological size by mammography by >1 cm occurred in 40% of those with compromised margins undergoing a therapeutic operation compared to only 14% of those with clear margins (P = 0.02). However, on multivariate analysis only pathological size (P < 0.0001, OR = 1.0,95% CI 1.037–1.128) and lack of a preoperative diagnosis by core biopsy (P < 0.0001, OR = 5.3,95% CI 1.859–15.08) were predictive of compromised margins. The presence of residual disease on re-excision was associated with increasing pathological size (P < 0.0001, OR = 1.085,95% CI 1.038–1.134) and decreasing DCIS-margin distance (P = 0.03, OR = 6.694,95% CI 1.84–37.855). Twenty-nine percent (n = 13/45) of lesions ≤3 cm compared to 84% (n = 27/32) of lesions >3 cm had residual disease on re-operation (P < 0.0001). Residual disease was present in 62% (n = 34/55), 64% (n = 7/11) and 17% (n = 2/12) of patients with DCIS-margin distances ≤1, 1–2 and 2–5 mm, respectively.
Conclusion
Considerable underestimation of DCIS extent by mammography occurs in a high proportion of patients with compromised margins in breast conservation. Patients at particularly high risk of residual disease on re-excision are those with lesions >3 cm and those with DCIS-margin distances of ≤ 2mm.
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Our thanks to Dr Christina O’Loughlin, PhD for statistical analysis.
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Dillon, M.F., Mc Dermott, E.W., O’Doherty, A. et al. Factors Affecting Successful Breast Conservation for Ductal Carcinoma in Situ. Ann Surg Oncol 14, 1618–1628 (2007). https://doi.org/10.1245/s10434-006-9246-y
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DOI: https://doi.org/10.1245/s10434-006-9246-y