Table 3.

Cox regression analysis of various potential prognostic factors in SCLC patients¹

Variables	RR	Unfavorable/Favorable	p	95% CI
HIF-1α immunostaining	39.207	high/low	0.003	3.355-458.219
Age	2.372	≧70/<70	0.025	1.114-5.049
Gender	0.824	male/female	0.868	0.084-8.080
ECGO performance status	4.286	3, 4/1, 2	0.108	0.726-25.303
Smoking status	1.110	current or ever smoked/never smoked	0.874	0.305-4.037
Distant metastasis	11.858	positive/negative	0.003	2.259-62.243

¹. Adjusted for age, sex, ECGO performance status, smoking and distant metastasis status.