Clinical value comparison between nomograms and AJCC stage system
The application values of nomograms were estimated by NRI, IDI, and C-index in this study. The nomogram-related C-index were higher than that of the AJCC stage system (0.713 vs 0.513 in the training set, 0.751 vs 0.486 in the validation set for predictions of OS; meanwhile, 0.729 vs 0.492, 0.702 vs 0.500 in the training and validation group for predictions of CSS) (Table 