Table 4.

Univariate and Multivariate Analysis of PFS

Factors	Univariate		Multivariate
	χ	P	HR (95% CI)	P
EGFR	7.264	0.007	1.832(1.061–3.160)	0.03
ProGRP	12.954	<0.001	2.462(1.338–4.531)	0.004
NSE	10.151	0.001	2.169(1.215–3.873)	0.009
Smoking	13.436	<0.001	0.351(0.191–0.643)	0.001

Abbreviations: PFS, progression‐free survival; EGFR, epidermal growth factor receptor; ProGRP, progastrin-releasing peptide; NSE, neuron-specific enolase; HR, hazard ratio; CI, confidence interval.