Published in:
Open Access
23-03-2024 | Breast Surgery | Breast Oncology
Clinicopathological Predictors of Positive Resection Margins in Breast-Conserving Surgery
Authors:
Hemali Chauhan, MBBS, BSc (Hons), MRCS, Natasha Jiwa, MBBS, BSc (Hons), MRCS, PhD, Vikneswaran Raj Nagarajan, MB, BCh, Paul Thiruchelvam, MBBS, BSc (Hons), FRCS, PhD, Katy Hogben, MBBS, BSc (Hons), FRCS, PhD, Ragheed Al-Mufti, MB, BCh, FRCS, MSc, MD, FRCS, Dimitri Hadjiminas, MD, MPhil, FRCS, Sami Shousha, MD, FRCPath, Ramsey Cutress, MB, BCh, FRCS, PhD, Hutan Ashrafian, PhD, MRCS, MBA, Zoltan Takats, PhD, Daniel Richard Leff, MBBS, FRCS, PhD, MS(Hons)
Published in:
Annals of Surgical Oncology
|
Issue 6/2024
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Abstract
Background
Ductal carcinoma in situ (DCIS) is associated with risk of positive resection margins following breast-conserving surgery (BCS) and subsequent reoperation. Prior reports grossly underestimate the risk of margin positivity with IBC containing a DCIS component (IBC + DCIS) due to patient-level rather than margin-level analysis.
Objective
The aim of this study was to delineate the relative risk of IBC + DCIS compared with pure IBC (without a DCIS component) on margin positivity through detailed margin-level interrogation.
Methods
A single institution, retrospective, observational cohort study was conducted in which pathology databases were evaluated to identify patients who underwent BCS over 5 years (2014–2019). Margin-level interrogation included granular detail into the extent, pathological subtype and grade of disease at each resection margin. Predictors of a positive margin were computed using multivariate regression analysis.
Results
Clinicopathological details were examined from 5454 margins from 909 women. The relative risk of a positive margin with IBC + DCIS versus pure IBC was 8.76 (95% confidence interval [CI] 6.64–11.56) applying UK Association of Breast Surgery guidelines, and 8.44 (95% CI 6.57–10.84) applying the Society of Surgical Oncology/American Society for Radiation Oncology guidelines. Independent predictors of margin positivity included younger patient age (0.033, 95% CI 0.006–0.060), lower specimen weight (0.045, 95% CI 0.020–0.069), multifocality (0.256, 95% CI 0.137–0.376), lymphovascular invasion (0.138, 95% CI 0.068–0.208) and comedonecrosis (0.113, 95% CI 0.040–0.185).
Conclusions
Compared with pure IBC, the relative risk of a positive margin with IBC + DCIS is approximately ninefold, significantly higher than prior estimates. This margin-level methodology is believed to represent the impact of DCIS more accurately on margin positivity in IBC.