Table 1. Baseline characteristics of all patients (N=136).

Characteristic	N	%
Age (years)
Median	60
Range	32-84
Gender
Male	50	36.7
Female	86	63.3
Smoking history
Never-smoker	83	61
Ever smoker	53	49
Histologic diagnosis
Adenocarcinoma	133	97.8
Squamous	1	0.7
Adenosquamous	2	1.5
Clinical stage
IIIB	1	0.7
IV	119	87.5
Postoperative relapse	16	11.8
Type of EGFR mutation*
Exon 19 deletion	75	51.4
L858R	65	44.5
Others*	6	4.1

^*10 patients had two or more coexsiting EGFR mutations