Abstract

e12613 Background: Breast cancer is in first place among malignant diseases in women in Russia. We can provide, in most cases, breast-conserving surgery (BCS), due to progress in early diagnosis. Evaluation of positive margins is still one of the most important objectives in breast-conserving surgery. Objectives: To assess the benefits of IDSR in BCS of patients with “carcinoma in situ”. Methods: The results of treatment of 55 patients with breast cancer “carcinoma in situ” in our clinic were evaluated in two comparable groups. Group A included 28 patients, who were operated on from January 2019 to June 2019 and had breast-conserving surgery without IDSR. Group B included 27 patients, who were operated on from June 2019 to January 2020 and had breast-conserving surgery with the evaluation of margins by IDSR. Results: In a planned histological examination positive margins were detected in group A in 4 cases (14%) and required reoperation. In group B all margins were clear. After IDSR, 6 (22%) patients out of 27 in this group showed microcalcifications in the resection margins or at a distance of less than 1 mm and required intraoperative additional excision to obtain clean margins. Conclusions: IDSR reduces the frequency of reoperation due to increased detection of positive margins, allows to correct scope and duration of surgery because of impact on the time of the surgical decision-making process.

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