Surgical De-Escalation for Re-Excision in Patients with a Margin Less Than 2 mm and a Diagnosis of DCIS.

Simple Summary: Ductal carcinoma in situ is a malignant cell proliferation confined to basement membrane. Current consensus guidelines recommend an optimal margin width of 2 mm and re-excision for closer margin is debated and it is sent back to clinical judgment. Our retrospective study evaluating 197 patients aim to investigate the importance of surgical margin and locoregional recurrence in patients with diagnosis of DCIS and treated with conservative breast surgery. We found no correlation between margins and loco-regional recurrence, and re-excision should be avoided in patients with focally positive margin and no evidence of the disease at post-surgical imaging. The current surgical guidelines recommend an optimal margin width of 2 mm for the management of patients diagnosed with ductal carcinoma in situ (DCIS). However, there are still many controversies regarding re-excision when the optimal margin criteria are not met in the first resection. The purpose of this study is to understand the importance of surgical margin width, re-excision, and treatments to avoid additional surgery on locoregional recurrence (LRR). The study is retrospective and analyzed surgical margins, adjuvant treatments, re-excision, and LRR in patients with DCIS who underwent breast-conserving surgery (BCS). A total of 197 patients were enrolled. Re-operation for a close margin rate was 13.5%, and the 3-year recurrence was 7.6%. No difference in the LRR was reported among the patients subjected to BCS regardless of the margin width (p = 0.295). The recurrence rate according to margin status was not significant (p = 0.484). Approximately 36.9% (n: 79) patients had resection margins < 2 mm. A sub-analysis of patients with margins < 2 mm showed no difference in the recurrence between the patients treated with a second surgery and those treated with radiation (p = 0.091). The recurrence rate according to margin status in patients with margins < 2 mm was not significant (p = 0.161). The margin was not a predictive factor of LRR p = 0.999. Surgical re-excision should be avoided in patients with a focally positive margin and no evidence of the disease at post-surgical imaging. [ABSTRACT FROM AUTHOR]

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