An artificial intelligence model to predict survival and chemotherapy benefits for gastric cancer patients after gastrectomy development and validation in international multicenter cohorts

•This model was developed by support vector machine(SVM), one of the artificial intelligence algorithm.•Based on 9 usual clinicopathologic features, this model is practical and generalizable for most clinical doctors.•The model was validated in the databases of multi-center in China and the database of The Cancer Genome Atlas (TCGA).•It seems be a potential tool to identify who can benefit more from adjuvant chemotherapy for gastric cancer patients.