Table 1. Multivariate analysis of overall survival using publically-available databases.

Variables	HR (95% CI)	P value
Gender (male vs. female)	0.94 (0.6–1.47)	0.79
Smoking history (never vs. ever)	0.51 (0.3–0.87)	0.013
Tumor stage	2.5 (1.82–3.42)	<0.0001
CCR4 gene expression (higher vs. lower)	1.55 (1.03–2.35)	0.037

HR, hazard ratio; CI, confidence interval.