Table 1. Clinicopathologic Features of Patients with Lung Adenocarcinoma.

	Number of patients (EGFR positive)	Number of patients (EGFR negative)	Total	p value
Age				0.67
≥60	46	49	95
<60	54	51	105
Gender				0.00*
Male	43	65	108
Female	57	35	92
Smoking history				0.00*
Non-smoker	84	48	132
Smoker	16	52	68
Stage				0.131
I	77	36	113
II	17	35	52
III	4	25	29
IV	2	4	6
EGFR mutation				0.00*
19-del	54	0	-
L858R	46	0	-

EGFR, epidermal growth factor receptor; 19-del, exon 19 deletion; L858R, arginine for leucine substitution at residue 858.

^*p<0.01.