Kaplan-Meier curves of the TNM stage and albumin-to-alkaline phosphatase ratio (AAPR)-TNM system in gastric cancer. (A) Kaplan-Meier curve for disease-free survival (DFS) stratified by TNM stage, (B) Kaplan-Meier curve of DFS stratified by AAPR-TNM stage, (C) receiver operating characteristic (ROC) analysis of the TNM stage and the AAPR-TNM system in DFS prediction, (D) Kaplan-Meier curve for overall survival (OS) stratified by TNM stage, (E) Kaplan-Meier curve of OS stratified by AAPR-TNM stage, (F) ROC analysis of the TNM stage and the AAPR-TNM system in OS prediction.