Table 1 Clinicopathological characteristics of the patient cohort

Gender

Male

116

53

Female

101

47

Age at surgery

< 65 years

100

46

> 65 years

117

54

Histology

Adenocarcinoma (incl. BAC)

132

61

Squamous cell carcinoma

60

28

Large cell carcinoma

25

11

Differentiation

G1 (well differentiated)

18

9

G2 (moderately differentiated)

138

69

G3 (poorly differentiated)

45

22

Missing

16

pTNM

I

135

63

II

42

19

III

35

16

IV

4

2

Missing*

1

pT

pT1

68

31

pT2

120

56

pT3

17

8

pT4

11

5

Missing*

1

pN

0

157

73

1

38

17

2

21

10

Missing*

1

pM

0

212

98

1

4

2

Missing*

1

Tumor size

< 2.0 cm

58

27

2.1-3.0 cm

62

29

3.1-5.0 cm

65

30

5.1-7.0 cm

23

10

> 7.0 cm

8

4

Missing*

1

Surgery

Lobectomy

147

68

Pulmectomy

26

12

Wedge resection

17

8

Bilobectomy

17

8

Other

10

4

Tobacco use

Current smoker

74

34

Former smoker

129

60

Never smoker

14

6