Table 1 Characteristics of the patients included in the study

Age (years)

Mean ± SD (range)

64.8

±9.8 (31-81)

Gender

Male

68

66.7

Female

34

33.3

Cigarette smoking

Never smoked

34

33.3

Ex-smoker

20

19.6

Current smoker

48

47.1

Pack-year/Mean ± SD (range)

36.6

±36.8 (0-180)

Tumor differentiation

Well

16

15.7

Moderate

53

52.0

Poor

32

31.4

Unknown

1

Tumor stage

II

31

30.4

III

60

58.8

IV

11

10.8

Operation method

Pneumonectomy

1

1.0

Bilobectomy

1

1.0

Lobectomy

83

81.4

Segmentectomy

9

8.8

Partial resection

8

7.8

Complete resection

Yes

77

75.5

No

25

24.5

Preoperative chemotherapy

Yes

9

8.8

No

93

91.2

Postoperative chemotherapy

Yes

74

72.5

No

28

27.5

Radiotherapy to thorax (chest wall or mediastinum)^a

Yes (Pre/Post)

5 (1/4)

4.9

No

97

95.1

EGFR gene mutation status

Wild-type

46

45.1

Mutation (+)

33

32.4

Unknown

23

22.5

Recurrence^b

Yes

82

80.4

No

20

19.6

Prognosis

Alive

33

34.4

Dead

63

65.6