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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