Table 1 Patient characteristics

Age at diagnosis, years

58 (range, 24–83)

Total number of included lesions

141

Gender

 Male

41 (38.7)

 Female

65 (61.3)

Smoking history

 Never

61 (57.5)

 Former or current

32 (30.2)

 Unknown

13 (12.3)

Stage at initial diagnosis

 IV

106 (100)

Number of included lesions in a patient

 1

87 (82)

 2

10 (9)

 ≥3

9 (8)

Site of included metastatic lesions (total 35)

 Lung

16 (46)

 Liver

9 (17)

 Lymph node

10 (29)

TKI drug

 Gefitinib (Iressa®)

60 (57)

 Erlotinib (Tarceva®)

46 (43)

EGFR Mutation subtype

 Exon 19 deletion

58 (55)

 Exon 21 L858R

42 (40)

 Others

6 (6)