Table 2. Cox regression analyses of overall survival.

	Univariate analysis		Multivariate analysis
Clinicopathological parameters	RR (95% CI)	P-value	RR (95% CI)	P-value
Age (n=84)	1.024 (1.000–1.049)	0.055	1.033 (1.006–1.060)	0.017
Sex
Female (n=19)	1	Reference	1	Reference
Male (n=65)	1.983 (0.993–3.959)	0.052	2.418 (1.158–5.047)	0.019
T stage
T1/T2 (n=16)	1	Reference
T3 (n=51)	1.339 (0.639–2.803)	0.439
T4 (n=17)	3.191 (1.380–7.377)	0.007
M stage
M0 (n=69)	1	Reference
M1 (n=15)	2.077 (1.089–3.960)	0.026
Nuclear Id-1 expression (n=79)	3.610 (0.918–14.197)	0.066	7.361 (1.588–34.109)	0.011
Overall Id-2 expression
Low (n=49)	1.862 (1.014–3.421)	0.045	2.151 (1.127–4.107)	0.020
High (n=30)	1	Reference	1	Reference

CI=confidence interval; RR=relative risk.