Gastric endoscopic submucosal dissection in Western countries: Indications, applications, efficacy and training perspective

Table 1 Absolute and expanded criteria for endoscopic submucosal dissection according the European Society of Gastrointestinal Endoscopy guideline

	Absolute criteria		Expanded criteria
			A	B	C	D
Histology	Dysplasia	Differentiated	Differentiated	Differentiated	Undifferentiated	Differentiated
Tumor size in mm	Any	≤ 20	> 20	≤ 30	≤ 20	≤ 30
Ulceration	Negative	Negative	Negative	Positive	Negative	Negative
Depth invasion	None	T1a	T1a	T1a	T1a	sm1, ≤ 500 μm

sm1: Shallow submucosal layer.