Table 1 Demographics of patient cohort (N = 128)

Sex

Male

71

56

Female

57

44

Age at surgery

<65 years

52

41

> 65 years

76

59

Histology

Adenocarcinoma

73

57

Squamous cell carcinoma

50

39

Large cell carcinoma

5

4

UICC stage / pTNM7

I

77

60

II

34

27

III

13

10

IV

4

3

pT

pT1

41

32

pT2

61

48

pT3

25

19

pT4

1

1

pN

pN0

102

80

pN1

18

14

pN2

8

6

Tumour size (cm)

≤ 2.0 cm

32

25

2.1–3.0 cm

27

21

3.1–5.0 cm

46

36

5.1–7.0 cm

10

8

>7.0 cm

13

10

Tobacco use

Current smoker

77

60

Former smoker

46

36

Never smoker

6

5