Completion mastectomy after breast conserving surgery.
ABSTRACT Breast conserving surgery (BCS) is increasingly offered to suitable patients diagnosed with early stage breast cancer. Occasionally the pathological margins on specimens following BCS are positive. The objective of this study is to assess the proportion of patients within our unit who required completion mastectomy after BCS and to determine if predictive factors could be identified to assist the breast surgeon identifying those patients at risk of positive margins following BCS.
All patients diagnosed with breast cancer between 2001 and 2005 were reviewed. Patients undergoing BCS had their histopathological specimens examined for any evidence of residual tumour at the margins of the resected specimen. These patients then proceeded to completion mastectomy if these margins were positive for residual tumour. Multinominal logistic regression was then performed on clinico-pathological factors for each of these patients to determine if predictive factors existed for determination of residual disease in the mastectomy specimen following BCS.
Logistic regression demonstrated that size of the initial tumour was the only significant predictor for the presence of completion mastectomy residual carcinoma (CMRC) (p=0.014) and that tumours with an initial size > 2.5 cm were 15 times more likely to have a CMRC than tumours < 1.5 cm. This prediction model based on the initial tumour size had an 89.5% specificity and 52.2% sensitivity. The odds ratio for CMRC based on histological tumour type for each additional 1cm increase in size of the initial tumour was 2.82 for ductal carcinoma in situ, 2.60 for infiltrating ductal carcinoma and 2.26 for other tumours.
This study demonstrates that residual disease in total mastectomy specimens following BCS increases significantly with increasing original tumour size. With current data, surgeons can inform patients of the risks of residual cancer associated with BCS with a view to increase the rate of primary mastectomies in those patients with presenting tumours greater than 2.5 cm.
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ABSTRACT: Breast-conserving surgery (BCS), followed by appropriate adjuvant therapies is established as a standard treatment option for women with early-stage invasive breast cancers. A number of factors have been shown to correlate with local and regional disease recurrence. Although margin status is a strong predictor of disease recurrence, consensus is yet to be established on the optimum margin necessary. Margenthaler et al. recently proposed the use of a "margin index," combining tumor size and margin status as a predictor of residual disease after BCS. We applied this new predictive tool to a population of patients with primary breast cancer who presented to a symptomatic breast unit to determine its suitability in predicting those who require reexcision surgery. Retrospective analysis of our breast cancer database from January 1, 2000 to June 30, 2010 was performed, including all patients who underwent BCS. Of 531 patients who underwent BCS, 27.1% (144/531) required further reexcision procedures, and 55 were eligible for inclusion in the study. Margin index was calculated as: margin index = closest margin (mm)/tumor size (mm) × 100, with index >5 considered optimum. Of the 55 patients included, 31% (17/55) had residual disease. Fisher's exact test showed margin index not to be a significant predictor of residual disease on reexcision specimen (P = 0.57). Of note, a significantly higher proportion of our patients presented with T2/3 tumors (60% vs. 38%). Although an apparently elegant tool for predicting residual disease after BCS, we have shown that it is not applicable to a symptomatic breast unit in Ireland.Annals of Surgical Oncology 06/2011; 19(1):207-11. · 4.12 Impact Factor
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ABSTRACT: INTRODUCTION: Breast-conserving surgery (BCS) is established as a standard treatment option for women with early-stage invasive breast cancers. Margin status predicts local disease recurrence. Up to 59 % of patients may undergo re-excision of their tumour cavity to establish clear margins. Intra-operative margin assessment may decrease re-excision rates. It is unclear if this procedure increases operative time. We compared intra-operative macroscopic assessment of margins, routine cavity shave margins and no formal intra-operative margin assessment to assess their impact on re-excision rates, residual disease burden and operative time. METHODS: Over a 42 month period, 188 patients from our retrospective breast cancer database were reviewed in our study. Of these, 68 had macroscopic margin assessment, 70 had cavity shave margins and 50 had no formal intra-operative assessment. Statistical analysis was performed as appropriate. RESULTS: Formal intra-operative margin assessment had a re-excision rate of 25 %, compared with 34 % for those without formal assessment. Formal assessment had a significantly reduced likelihood of having residual disease following the primary procedure (p = 0.02). Close margins (<2 mm) also predicted the presence of residual disease (p = 0.01). There was no difference in operative duration between the groups. CONCLUSION: Directed intra-operative margin assessment reduces residual disease burden in BCS without increasing operative duration.Breast Cancer 05/2013; · 1.33 Impact Factor