The 2025 15th Peritoneal Surface Oncology Group International Congress was held in Barcelona, Spain, with a focus on the theme "convergence and co-advancement of clinical and basic research", comprehensively showcasing the latest advancements in the diagnosis and treatment of peritoneal surface tumors. This article summarized the clinical progress and basic-translational research presented at the congress, aiming to provide insights into international frontiers and promote standardized and personalized treatment of peritoneal surface tumors.