Table 3.

Performance of models in the SEER training set

Models	C-index(95% CI)	P*
High grade
Model 1	0.740 (0.727–0.754)	–
Model 2	0.734 (0.720–0.747)	0.0006
Low grade
Model 3	0.717 (0.673–0.761)	–
Model 4	0.714 (0.671–0.758)	0.474

SEER the Surveillance Epidemiology, and End Results database, AJCC the American Joint Committee on Cancer

*P values were obtained by comparing model 1 with model 2,as well as model 3 with model 4