Table 1. Basic characteristic of 503 patients.

Characteristics	N	%
Age
Median	59
Range	21–86
Gender
Male	293	58.3
Female	210	41.7
Smoking status
Non-smokers	243	48.3
Smoking	259	51.5
No record	1	0.2
PS score
0–1	477	94.8
≥2	26	5.2
Histological type
Adenocarcinoma	435	86.5
Squamous	58	11.5
NSCLC NOS	4	0.8
Large cell lung cancer	2	0.4
Mixed type	4	0.8
Disease type
Recurrent	135	26.8
Locally advanced or metastatic disease	368	73.2
EGFR
Mutation	184	36.6
Wild type	319	63.4