Table 4. The harrell's c-index for the nomogram to predict OS and CSS.

Groups	OS		CSS
	HR	95%CI	HR	95%CI
SEER cohort	0.817	0.806-0.828	0.829	0.817-0.841
FMMU cohort	0.829	0.783-0.869	0.807	0.761-0.853

Abbreviations: OS, overall survival; CSS, cancer-specific survival; HR, hazard ratio; CI, confidence interval.