Table 6.

Multivariate Cox analysis of overall survival and progression-free survival.

Factor	Overall Survival			Progression Free Survival
	HR	95%CI	P - value	HR	95%CI	P - value
Perineural invasion
Without vs. With	2.568	1.013∼6.512	0.047
Pathological stage
Stage I		1.000			1.000
Stage II	46.731	6.832∼319.651	<0.001	29.655	6.914∼127.191	<0.001
Stage III	16.964	4.276∼67.295	<0.001	7.971	2.913∼21.813	<0.001
FFA/Alb
<9.812 vs. ≥9.812	0.576	0.344∼0.962	0.035	0.655	0.430∼0.998	0.049
Smoking status
Never vs. Current/past				2.052	1.121∼3.754	0.020
Adjuvant radiation therapy
No vs. Yes				3.501	2.136∼5.739	<0.001
LNs
<10					1.000
10∼19				0.481	0.255∼0.909	0.024
≥20				0.646	0.402∼1.037	0.070
T stage
T1					1.000
T2				2.551	0.968∼6.719	0.058
T3				2.508	1.093∼5.752	0.030
T4				1.939	1.139∼3.303	0.015
N stage
N0					1.000
N1				3.760	0.656∼21.561	0.137
N2				3.013	0.879∼10.332	0.079
N3				2.558	1.128∼5.803	0.025
Tumor location
Superior lobe of left lung					1.000
Inferior lobe of left lung				0.530	0.288∼0.975	0.041
Superior lobe of right lung				0.847	0.450∼1.596	0.607
Middle lobe of right lung				0.613	0.335∼1.120	0.112
Inferior lobe of right lung				0.757	0.375∼1.527	0.437

FFA/Alb, serum free fatty acid/albumin ratio; LNs, Number of lymph nodes removed surgically.