Table 2. Univariate and multivariate Cox regression analysis.

Variables	Univariate analysis			Multivariate analysis
	HR	95% CI	p-value	HR	95% CI	p-value
Risk score	2.21	1.40-3.49	<0.001	2.12	1.33-3.37	0.002
Age	1.020	0.99-1.06	0.19	1.01	0.98-1.05	0.46
Stage
III/IV	1 (reference)			1 (reference)
I/II	0.96	0.45-2.06	0.92	0.98	0.45-2.16	0.97
Grade
G3	1 (reference)			1 (reference)
G1/G2	0.88	0.34-2.30	0.8	0.99	0.37-2.64	0.98