Risk prediction model for gastric cancer within 5 years in healthy Korean adults

Background Although endoscopy is commonly used for gastric cancer screening in South Korea, predictive models that integrate endoscopy results are scarce. We aimed to develop a 5-year gastric cancer risk prediction model using endoscopy results as a predictor. Methods We developed a predictive model using the cohort data of the Kangbuk Samsung Health Study from 2011 to 2019. Among the 260,407 participants aged ≥20 years who did not have any previous history of cancer, 435 cases of gastric cancer were observed. A Cox proportional hazard regression model was used to evaluate the predictors and calculate the 5-year risk of gastric cancer. Harrell’s C-statistics and Nam-D’Agostino χ 2 test were used to measure the quality of discrimination and calibration ability, respectively. Results We included age, sex, smoking status, alcohol consumption, family history of cancer, and previous results for endoscopy in the risk prediction model. This model showed sufficient discrimination ability [development cohort: C-Statistics: 0.800, 95% confidence interval (CI) 0.770–0.829; validation cohort: C-Statistics: 0.799, 95% CI 0.743–0.856]. It also performed well with effective calibration (development cohort: χ 2 = 13.65, P = 0.135; validation cohort: χ 2 = 15.57, P = 0.056). Conclusion Our prediction model, including young adults, showed good discrimination and calibration. Furthermore, this model considered a fixed time interval of 5 years to predict the risk of developing gastric cancer, considering endoscopic results. Thus, it could be clinically useful, especially for adults with endoscopic results.