The Impact of Radiation on Nipple Symmetry After Bilateral Nipple-Sparing Mastectomy and Implant-Based Reconstruction: An Objective Analysis.

INTRODUCTION

Radiation therapy can adversely affect outcomes of implant-based breast reconstruction, potentially complicating procedures like nipple-sparing mastectomy (NSM), which is increasingly popular in breast cancer management. This study aims to evaluate the impact of radiation on nipple symmetry in patients undergoing bilateral NSM with implant-based reconstruction.

METHODS

We conducted a retrospective analysis using data from an Emory University review board-approved database. This encompassed bilateral NSMs coupled with immediate implant-based reconstructions. The BCCT.core software was employed to objectively measure nipple asymmetry preoperatively and postoperatively. Metrics, such as Breast Retraction Assessment values, upper nipple retraction, lower breast contour, and nipple to midline (NML) discrepancies were quantified. The study included 80 patients with a minimum of 1 year of follow-up; among them, 15 received radiation therapy (RT) while 65 did not.

RESULTS

The reconstructions were divided into tissue expander, used in 39 cases (48.8%), and direct-to-implant (DTI), employed in 41 cases (51.2%). The DTIs were further categorized based on the location of the implant: 22 subpectoral and 19 prepectoral. Radiation was applied to 15 breasts, distributed among prepectoral DTI (4), subpectoral DTI (6), and tissue expander (5). Breast Retraction Assessment scores significantly differed between the nonirradiated and irradiated groups (1.49 vs 2.64, P < 0.0004). Nipple to midline differences and Upper Nipple Retraction also significantly varied postradiation, especially when comparing subpectoral and prepectoral implant placements.

CONCLUSIONS

Radiation therapy has a detrimental effect on nipple symmetry after bilateral NSM and implant-based reconstruction, with variations seen regardless of the implant's placement or the reconstructive technique utilized. Specifically, subpectoral reconstructions irradiated were prone to lateral nipple displacement, likely related to radiation-induced pectoralis muscle changes, while prepectoral irradiated reconstructions tended to have increased vertical displacement. These insights are crucial for patient education and surgical planning in the context of radiation and breast reconstruction.