Table 4. Comparison of the predictive power of the prognostic models in the entire TCGA set (n = 514).

Factor	Overall survival
	C-index	95% CI	AIC
Age	0.585	0.540-0.630	1880.50
Grade	0.671	0.630-0.712	1836.55
Stage	0.729	0.690-0.768	1806.80
Risk score	0.677	0.634-0.720	1834.55
Risk score + age + stage	0.769	0.734-0.804	1759.15
Age + grade + stage	0.757	0.724-0.798	1779.03
Risk score + age + grade + stage	0.772	0.737-0.807	1757.51

Abbreviations: C-index, Harrell's concordance index; CI, confidence interval; AIC, Akaike information criterion.