Table 1 Patient characteristics

Sex

Male

62

Female

39

Age (mean)

73

35–90

Operation

Open

33

Laparoscopy

51

Robotic-assisted laparoscopy

17

Lymph node dissection

D0, D1

17

D1+

71

D2

13

Reconstruction

B-I

98

R-Y

3

Stapler

Circular

64

Linear

37

Tumor location

M

44

L

57

Macroscopic type

0-I, IIa

26

0-IIb

2

0-IIc

32

Type 1

7

Type 2, 3

29

Type 4, 5

6

Tumor size (mm)

44

5–180

Depth of invasion

m

24

sm

27

mp

18

ss

19

se, si

13

Histological grade

Differentiated

57

Undifferentiated

44

Lymphatic involvement

Positive

52

Negative

49

Vessel involvement

Positive

60

Negative

41

Lymph node metastasis

N0

66

N1

14

N2

13

N3a

5

N3b

3

CY

CY0

26

CY1

2

CYX

73

Stage

IA, IB

58

IIA, IIB

26

IIIA, IIIB

17

Stapler washing cytology

Positive

7

Negative

94

Postop cytology

Positive

3

Negative

98