Table 2. Univariate and multivariate analyses of prognostic variables.

	Univariate analysis	Multivariate analysis
Variable	P	95% CI	RR	P
Sex	0.662	0.528–2.283	1098	0.802
Age	0.735	0.564–2.219	1.118	0.749
Histology	0.135	0.983–4.086	2.004	0.056
Differentiation	0.427	0.860–2.448	1.461	0.155
T stage	0.602	0.402–1.714	0.830	0.615
Smoking history	0.623	0.546–2.331	1.128	0.745
MVD	0.040	0.788–3.426	1.643	0.185
HIF-1α	0.306	0.236–1.606	0.616	0.322
VEGF	0.061	0.741–4.892	1.904	0.181
RBP2 protein	0.037	1.021–4.356	2.109	0.044

CI: confidence interval.