Table 1 Baseline demographic, clinicopathological characteristics in patients with positive margin (PM) and negative margin (NM). IQR: Interquartile Range; BMI: body mass index; ASA-PS: American Society of Anesthesiologists physical status classification system

Age (Median) (IQR)

66 (55–71)

65 (57–72)

0.949

Sex

0.031

 Male

27

55.1

1856

68.5

 Female

22

44.9

852

31.5

BMI (Median) (IQR)

21.5 (19.3–23.5)

22.0 (22.0–24.2)

0.213

ASA-PS

0.847

 1

17

35.4

936

34.8

 2

30

62.5

1718

64

 3

1

2.1

32

1.2

Not available

1

22

Neoadjuvant chemotherapy

0.007

 Yes

7

14.3

122

4.5

 No

42

85.7

2586

95.5

Surgical approach

0.004

 Open

44

89.8

1918

70.8

 laparoscopic

5

10.2

790

29.2

Gastrectomy

< 0.001

 Distal

18

36.7

1718

63.4

 Proximal

2

4.1

31

1.1

 Total

29

59.2

959

35.4

Thoracotomy

0.290

 Yes

1

2.0

18

0.7

 No

48

98.0

2690

99.3

Remnant cancer

0.002

 Yes

6

12.2

68

2.5

 No

43

87.8

2640

97.5

Esophageal invasion

< 0.001

 Yes

9

18.4

94

3.5

 No

40

81.6

2614

96.5

 Median (IQR)

105 (71–147)

–

41 (26–65)

–

< 0.001

  ≥ 80 mm

34

30.6

294

10.9

< 0.001

  < 80 mm

15

69.4

2407

89.1

Histopathological type

< 0.001

 Differentiated

5

10.2

1241

45.8

 Undifferentiated

44

89.8

1467

54.2

Macroscopic Type

< 0.001

 Type0

1

2

1652

61

 Type1

0

0

82

3

 Type2

0

0

313

11.6

 Type3

13

26.5

282

10.4

 Type4

24

49

101

3.7

 Type5

11

22.4

278

10.3

pT category

< 0.001

 T1

0

0

1578

58.3

 T2

4

8.2

374

13.8

 T3

5

10.2

238

8.8

 T4

40

81.6

518

19.1

pN category

< 0.001

 N0

13

26.5

1827

67.5

 N1

4

8.2

344

12.7

 N2

7

14.3

245

9

 N3

25

51

292

10.8

pTNM stage

< 0.001

 I

2

4.1

1783

65.8

 II

11

22.4

453

16.7

 III

723

46.9

423

15.6

 IV

13

26.5

49

1.8