Table III.

Analysis using a Cox proportional hazards regression model for assessing the association between the plasma lactate dehydrogenase level and the overall survival.

Variable	HR (95% CI)	P-value
Stage		0.42
III/IV	1.52 (0.56–4.80)
Recurrence	1
EGFR status		<0.01
Common	0.14 (0.04–0.49)
Uncommon	1
PS		0.03
0–1	0.36 (0.14–0.89)
≥2	1
Pleural effusion		0.14
Yes	1.97 (0.80–5.11)
No	1
LDH		<0.01
<210	0.27 (0.11–0.61)
≥210	1

EGFR, epidermal growth factor receptor; LDH, lactate dehydrogenase; PS, performance status; HR, hazard ratio; CI, confidence interval.