Table 1. Baseline characteristics of the study population (n=33).

Variables	Number	Percent
Gender
Male	16	48.5
Female	17	51.5
PS
0-1	22	66.7
2-3	11	33.3
Age
Median	59.0
Mean	57.9±10.6
Smoking history
Yes	10	30.3
No	23	69.7
Histology
Adenocarcinoma	28	84.8
Non-adenocarcinoma	5	15.2
Staging
IIIB	0	0
IV	33	100
Chemotherapy before re-treatment
Yes	33	100
No	0	0
TKI
Gefitinib	20	60.6
Erlotinib	13	39.4
Brain metastasis
Yes	6	18.2
No	27	81.8