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The Feasibility of Breast-Conserving Surgery for Multiple Ipsilateral Breast Cancer: An Initial Report from ACOSOG Z11102 (Alliance) Trial

Abstract

Background

Historically, multiple ipsilateral breast cancer (MIBC) has been a contraindication to breast-conserving therapy (BCT). We report the feasibility of BCT in MIBC from the ACOSOG Z11102 trial [Alliance], a single arm noninferiority trial of BCT for women with two or three sites of malignancy in the ipsilateral breast.

Methods

Women who enrolled preoperatively in ACOSOG Z11102 were evaluated for conversion to mastectomy and need for reoperation to obtain negative margins. Characteristics of women who successfully underwent BCT and those who converted to mastectomy were compared. Factors were examined for association with the need for margin reexcision.

Results

Of 198 patients enrolled preoperatively, 190 (96%) had 2 foci of disease. Median size of the largest tumor focus was 1.5 (range 0.1–7.0) cm; 49 patients (24.8%) had positive nodes. There were 14 women who underwent mastectomy due to positive margins, resulting in a conversion to mastectomy rate of 7.1% (95% confidence interval [CI] 3.9–10.6%). Of 184 patients who successfully completed BCT, 134 completed this in a single operation. Multivariable logistic regression analysis did not identify any factors significantly associated with conversion to mastectomy or need for margin reexcision.

Conclusions

Breast conservation is feasible in MIBC with 67.6% of patients achieving a margin-negative excision in a single operation and 7.1% of patients requiring conversion to mastectomy due to positive margins. No characteristic was identified that significantly altered the risk of conversion to mastectomy or need for reexcision.

ClinicalTrials.gov Identifier

NCT01556243.

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Acknowledgment

Research reported in this publication was supported by the National Cancer Institute of the National Institutes of Health under Award Numbers U10CA180821 and U10CA180882 (to the Alliance for Clinical Trials in Oncology), U10CA180790, U10CA180854, and U10CA180858. The content is solely the responsibility of the authors and does not necessarily represent the official views of the National Institutes of Health.

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Correspondence to Kari M. Rosenkranz MD.

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Rosenkranz, K.M., Ballman, K., McCall, L. et al. The Feasibility of Breast-Conserving Surgery for Multiple Ipsilateral Breast Cancer: An Initial Report from ACOSOG Z11102 (Alliance) Trial. Ann Surg Oncol 25, 2858–2866 (2018). https://doi.org/10.1245/s10434-018-6583-6

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Keywords

  • ACOSOG Z11102
  • American College Of Surgeons Oncology Group (ACOSOG)
  • Reexcision
  • Z0011 Trial
  • Ductal Carcinoma In Situ (DCIS)