Table 2.

Clinical and molecular characteristics related to exposure history in all patients

Variable	WSE (N = 15)	Smoking exposure (N = 12)	P*
Gender
Female	12	5	0.49
Male	3	7
Age Mean (±SD)	63 (11.88)	62.9 (12.12)	0.89
aEGFR mutation (N = 9)
Positive	8	1
Negative	7	11	0.003
Stage
IIIB	0	1
IV	13	9
Recurrent	2	2	0.70

*Non-parametric test: Mann-Whitney U test

^a9/27 patients had EGFR mutation