Table 3.

Cox multivariate analysis on OS.

Parameter	HR	95% CI	p-value
Gender (female vs. male)	1.191	0.645-2.199	0.576
Tobacco (never vs. other)	0.499	0.265-0.941	0.032
Histology (adenocarcinoma vs. other)	0.418	0.175-1.002	0.051
Stage (IV vs. other)	2.187	0.860-5.563	0.100
Brain metastases (yes vs. no)	1.172	0.560-2453	0.673
Organ (3 or more vs. less)	1.653	0.795-3.437	0.178

CI, confidence interval; HR, Hazard Ratio; OS, overall survival.