Table 1 Characteristics of patient cohort

Gender

Male

114

54

Female

96

46

Histology

Adenocarcinoma (incl. BAC)

128

61

Squamous cell carcinoma

58

28

Large cell carcinoma

24

11

Differentiation

G1 (well differentiated)

20

10

G2 (moderately differentiated)

135

68

G3 (poorly differentiated)

43

22

Missing

12

pTNM

I

135

64

II

43

21

III

32

15

pT

pT1

67

32

pT2

114

54

pT3

19

9

pT4

10

5

pN

0

153

73

1

38

18

2

19

9

Tumor size

≤ 2.0 cm

56

27

2.1 – 3.0 cm

61

29

3.1 – 5.0 cm

64

30

5.1 – 7.0 cm

23

11

> 7.0 cm

6

3

Metastasis*

Yes

55

26

No

155

74

Local recurrence

Yes

24

11

No

186

89

Death

Yes

70

33

No

140

67