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Table 2 Results of endoscopic resection

From: Endoscopic resection as an independent predictive factor of local control in patients with T1bN0M0 esophageal squamous cell carcinoma treated with chemoradiotherapy: a retrospective study

Characteristic

Number

Percent

Method of ER

 EMR

1

1.6

 ESD

62

98.4

Type of resection

 En bloc

62

98.4

 Unknown

1

1.6

Pathological tumor depth

 SM1

13

20.6

 SM2

50

79.4

Tumor differentiation grade

 Unknown

20

31.7

 G1

3

4.8

 G2

34

54.0

 G3

6

9.5

 G4

0

0.0

Lymphatic invasion

 Positive

20

31.7

 Negative

38

60.3

 Unknown

5

7.9

Venous invasion

 Positive

14

22.2

 Negative

45

71.4

 Unknown

4

6.3

Horizontal margin

 Positive

6

9.5

 Negative or uncertain

57

90.5

Vertical margin

 Positive

1

1.6

 Negative or uncertain

62

98.4

  1. ER endoscopic resection, EMR endoscopic mucosal resection, ESD endoscopic submucosal dissection