Enhancing Expertise in Reirradiation: Results from a Training Workshop Organized by Unicancer, the Federation of French Cancer Centers.

Reirradiation (reRT) is an increasingly significant therapeutic option for managing recurrent cancers. Its implementation requires multidisciplinary expertise to address challenges such as patient selection, cumulative dose management, and advanced imaging integration. Despite its growing use, formal reRT-focused education remains limited. To address this gap, a national workshop was organized to enhance knowledge, promote collaboration, and establish a working group for reRT in France.Conducted in June 2024, the workshop was organized by Unicancer Formation, the training body of Unicancer, the federation of French cancer centers, which is a certified training organization ensuring compliance with national quality standards. The workshop aimed to achieve three core objectives: identifying eligible patients using advanced imaging and artificial intelligence, selecting optimal reRT techniques while addressing dose summation challenges, and fostering research and clinical trial participation. The program combined expert-led lectures, case-based discussions, and group sessions. A roadmap guided the program's structure, with knowledge assessed through pre- and post-training multiple-choice questionnaires (MCQs) on clinical eligibility, dose management, imaging integration, and research development.Among 78 participants (62.7% radiation oncologists, 26.9% physicists, 10.4% radiation therapists), most were senior professionals (69.2%), representing cancer centers (46.2%), liberal practices (30.7%), and university hospitals (17.9%). MCQ scores improved significantly from 5.88 ± 1.29 to 7.74 ± 1.91 (p < 0.0001), with an average gain of 1.86 ± 1.51 points.The workshop significantly improved reRT-related knowledge and demonstrated the value of structured education in standardizing practices. Establishing a national working group lays the groundwork for future collaborative research and clinical advancements in reRT.