SubmissionNumber#=%=#62 FinalPaperTitle#=%=#Overview of the BioLaySumm 2025 Shared Task on Lay Summarization of Biomedical Research Articles and Radiology Reports ShortPaperTitle#=%=# NumberOfPages#=%=#13 CopyrightSigned#=%=#Chenghao Xiao JobTitle#==# Organization#==# Abstract#==#This paper presents the setup and results of the third edition of the BioLaySumm shared task on Lay Summarization of Biomedical Research Articles and Radiology Reports, hosted at the BioNLP Workshop at ACL 2025. In this task edition, we aim to build on the first two editions' successes by further increasing research interest in this important task and encouraging participants to explore novel approaches that will help advance the state-of-the-art. Specifically, we introduce the new task of Radiology Report Generation with Layman's terms, which is parallel to the task of lay summarization of biomedical articles in the first two editions. Overall, our results show that a broad range of innovative approaches were adopted by task participants, including inspiring explorations of latest RL techniques adopted in the training of general-domain large reasoning models. Author{1}{Firstname}#=%=#Chenghao Author{1}{Lastname}#=%=#Xiao Author{1}{Username}#=%=#chenghaoxiao Author{1}{Email}#=%=#chenghao.xiao@durham.ac.uk Author{1}{Affiliation}#=%=#Durham University Author{2}{Firstname}#=%=#Kun Author{2}{Lastname}#=%=#Zhao Author{2}{Username}#=%=#zhaokun Author{2}{Email}#=%=#kun.zhao@pitt.edu Author{2}{Affiliation}#=%=#University of Pittsburgh Author{3}{Firstname}#=%=#Xiao Author{3}{Lastname}#=%=#Wang Author{3}{Email}#=%=#xiao.wang-26@postgrad.manchester.ac.uk Author{3}{Affiliation}#=%=#University of Manchester Author{4}{Firstname}#=%=#Siwei Author{4}{Lastname}#=%=#Wu Author{4}{Email}#=%=#siwei.wu-2@postgrad.manchester.ac.uk Author{4}{Affiliation}#=%=#University of Manchester Author{5}{Firstname}#=%=#Sixing Author{5}{Lastname}#=%=#Yan Author{5}{Email}#=%=#cssxyan@comp.hkbu.edu.hk Author{5}{Affiliation}#=%=#Hong Kong Baptist University Author{6}{Firstname}#=%=#Tomas Author{6}{Lastname}#=%=#Goldsack Author{6}{Username}#=%=#tomasg25 Author{6}{Email}#=%=#tgoldsack1@sheffield.ac.uk Author{6}{Affiliation}#=%=#University of Sheffield Author{7}{Firstname}#=%=#Sophia Author{7}{Lastname}#=%=#Ananiadou Author{7}{Username}#=%=#effie Author{7}{Email}#=%=#sophia.nactem@gmail.com Author{7}{Affiliation}#=%=#University of Manchester Author{8}{Firstname}#=%=#Noura Author{8}{Lastname}#=%=#Al Moubayed Author{8}{Username}#=%=#nouramoubayed Author{8}{Email}#=%=#noura.al-moubayed@durham.ac.uk Author{8}{Affiliation}#=%=#Durham University Author{9}{Firstname}#=%=#Liang Author{9}{Lastname}#=%=#Zhan Author{9}{Username}#=%=#lzhan Author{9}{Email}#=%=#liang.zhan@pitt.edu Author{9}{Affiliation}#=%=#University of Pittsburgh Author{10}{Firstname}#=%=#William K. Author{10}{Lastname}#=%=#Cheung Author{10}{Username}#=%=#williamhkbu Author{10}{Email}#=%=#william@comp.hkbu.edu.hk Author{10}{Affiliation}#=%=#Hong Kong Baptist University Author{11}{Firstname}#=%=#Chenghua Author{11}{Lastname}#=%=#Lin Author{11}{Username}#=%=#linron84 Author{11}{Email}#=%=#chenghua.lin1@gmail.com Author{11}{Affiliation}#=%=#Department of Computer Science, University of Manchester ========== èéáğö