Table 5. The C-indices for predictions of overall survival and cancer-specific survival.

	OS		CSS
	C-index	95% CI	C-index	95% CI
Training group	0.723	0.711-0.735	0.751	0.738-0.764
Validation group	0.730	0.714-0.747	0.755	0.738-0.773
External verification	0.716	0.644-0.789	0.712	0.638-0.785

Abbreviations: OS: overall survival; CSS: cancer-specific survival; C-index: index of concordance; CI: confidence interval.