977 The Impact of Post-Mastectomy Radiotherapy on Immediate Free Flap Breast Reconstruction

Abstract

Abstract Aim Radiotherapy following free flap breast reconstruction has historically been thought to increase complication rates, worsen patient reported outcomes (PROs) and lead to poorer cosmetic results. We aim to assess the impact post-mastectomy radiotherapy (PMRT) has on immediate free flap breast reconstruction using these variables, with patients acting as inherent controls. Method We conducted a retrospective cohort study on all patients receiving immediate bilateral free flap breast reconstruction followed by unilateral radiotherapy between 2008 and 2022. Complication rates were assessed by comparing prevalence of fat necrosis, volume depletion requiring lipofilling, and flap loss among irradiated vs non-irradiated breasts. PROs were assessed by comparing “Satisfaction with Breasts” and “Chest Physical Well-Being” (two sections of the Breast-Q survey) among irradiated vs non-irradiated breasts. Cosmetic outcomes were assessed by scoring postoperative pre-radiotherapy and postoperative post-radiotherapy patient images using “Objective Breast Cosmesis Scale” (OBCS) and “Harvard Breast Cosmesis Scale” (HBCS). Results 9 patients underwent immediate bilateral free flap breast reconstruction followed by unilateral radiotherapy. Median age was 40 years (IQR 32-44). Complication rates did not vary significantly between irradiated and non-radiated breasts. “Satisfaction with Breasts” did not vary significantly between irradiated and non-radiated breasts; however, “Chest Physical Well-Being” did vary significantly between both breasts. Cosmetic outcomes did not vary significantly between pre-radiotherapy and post-radiotherapy images. Conclusions PMRT following immediate free flap breast reconstruction does not have significant deleterious effects on complication rates, patient satisfaction with breasts or cosmetic outcomes. However, radiotherapy has a significant effect on patient’s chest physical well-being, hence we aim to study this further.