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Objectives: The evidence demonstrating the efcacy of photobiomodulation (PBM) therapy for preventing and managing acute radiation dermatitis (ARD) is growing steadily. The question that arises from many clinicians is, if PBM is safe for oncologic patients. This study aimed to evaluate the diseasefree survival (DFS), cancerfree survival (CFS), and overall survival (OS) of breast cancer patients treated with PBM for ARD. Methods: Clinical data of 120 breast cancer patients treated with prophylactic PBM (n = 60, 2x/week, 808−905 nm, 4 J/cm 2) or placebo (n = 60) during conventional fractionation (CF) radiotherapy (RT) between April 2015 and June 2017 were retrospectively analyzed (TRANSDERMIS trial). During followup (April 2015 to May 2022), patients underwent a complete clinical evaluation every 6 months and blood analysis and mammography yearly in the rst 5 years after the end of RT. The DFS, CFS, and OS were estimated. Results: At a median followup time of 66 months (range 4−81), there was no signicant difference in DFS (73.7% vs. 98.3%, resp., p = 0.54), CFS (68.4% vs. 77.8%, resp., p = 0.79), and OS (87.9% vs. 98.3%, resp., p = 0.30) between the placebo and PBM group. Conclusions: This paper is the rst to describe the results of a longterm followup in earlystage breast cancer patients who underwent PBM for ARD. Results suggest that using PBM in breast cancer patients undergoing CF RT does not inuence the locoregional recurrence, the development of new primary tumors, or OS. We would like to thank all patients, doctors, and nurses for their participation in TRANSDERMIS trial. In addition, we want to thank Jessa Hospital and Hasselt University for providing the needed infrastructure and software packages. This study is part of the Limburg Clinical Research Center (LCRC)UHasselt‐ZOL‐Jessa, financially supported by the foundation Limburg Sterk Merk, province of Limburg, Flemish government, Hasselt University, Ziekenhuis Oost‐Limburg, and Jessa Hospital. Additionally, this study is supported by Kom op Tegen Kanker (Stand up to Cancer), the Flemish cancer society, LimburgsKankerfonds, and ASA Srl.