Clinical Edge

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Margins for Breast-Conserving Surgery

J Clin Oncol; ePub 2016 Aug 15; Morrow, Van Zee, et al

Low rates of ipsilateral breast tumor recurrence (IBTR) was observed with the use of a 2-mm margin as the standard for an adequate margin in ductal carcinoma in situ (DCIS) treated with whole-breast irradiation (WBRT), and this standard has the potential to decrease re-excision rates, improve cosmetic outcome, and decrease health care costs. This according to a consensus guideline from the Society of Surgical Oncology, the American Society for Radiation Oncology, and the American Society of Clinical Oncology developed from a systematic review of 20 studies including 7,883 patients. Among the key guideline findings:

• Negative margins halve the risk of IBTR compared with positive margins defined as ink on DCIS.

• A 2-mm margin minimizes the risk of IBTR compared with smaller negative margins.

• More widely clear margins do not significantly decrease IBTR compared with 2-mm margins.

• Negative margins <2-mm alone are not an indication for mastectomy.

The authors concluded that clinical judgment should be used in determining the need for further surgery in patients with negative margins <2 mm.

Citation: Morrow M, Van Zee KJ, Solin LJ, et al. Society of Surgical Oncology—American Society for Radiation Oncology—American Society of Clinical Oncology consensus guideline on margins for breast-conserving surgery with whole-breast irradiation in ductal carcinoma in situ. [Published online ahead of print August 15, 2016]. J Clin Oncol. doi:10.1200/JCO.2016.68.3573.