Table 1.

Basic clinical characteristics of patients

Characteristics	EGFR-TKI group	Chemotherapy group	Chemotherapy–EGFR-TKI group
Age (years)
Median	55 (37–77)	53 (36–76)	57 (36–79)
Gender
Female	18	20	19
Male	13	9	13
Smoking status
Non-smoker	18	24	27
Smokera	13	5	5
ECOG score
0–1	24	18	28
2–3	7	11	4
Stage of disease
IIIB	4	4	5
IV	27	25	27
Histological subtype
Adenocarcinoma	30	24	30
Non-adenocarcinoma	1	5	2
Mutation types
Exon 19	18	11	20
Exon 21	12	11	10
Others	1	7	2

Note:

^aA person who smoked more than 100 cigarettes in his/her past history was defined as an ever smoker.

Abbreviations: ECOG, Eastern Cooperative Oncology Group; TKI, tyrosine kinase inhibitor.