Table 2. Endoscopic resection.

Endoscopic resection		KGCA (2018)	JGCA (2018)	CSCO (2021)	NCCN (2021)	ESMO (2016)
ER
	Recommendation	Strong for		Grade I	Category 2A	Grade B
	Indication	≤2 cm, T1a, UL (−), Diff	For EMR or ESD	For EMR or ESD	≤2 cm, T1a, Diff, LVI (−), HM (−), VM (−)	≤2 cm, T1a, well diff, UL (−)
			≤2 cm, T1a, UL (−), Diff	≤2 cm, T1a, UL (−), Diff
			For ESD	For ESD
			1. >2 cm, T1a, UL (−), Diff or ≤3 cm, T1a, UL (+)	1. >2 cm, T1a, UL (−), Diff or ≤3 cm, T1a, UL (+)
			2. ≤2 cm, T1a, UL (−), Undiff	2. ≤2 cm, T1a, UL (−), Undiff
ER or surgery
	Recommendation	Weak for
	Indication	1. >2 cm, T1a, UL (−), Diff or ≤3 cm, T1a, UL (+)
		2. ≤2 cm, T1a, UL (−), Undiff
Additional surgery
	Recommendation	Strong for		Grade I	Category 2A
	Indication	Outside ER indication or LVI (+) or VM (+)	eCura C	Outside ER indication	Undiff, LVI (+), T1b, HM (+), VM (+)	Outside ER indication

KGCA = Korean Gastric Cancer Association; JGCA = Japanese Gastric Cancer Association; CSCO = Chinese Society of Clinical Oncology; NCCN = National Comprehensive Cancer Network; ESMO = European Society for Medical Oncology; Diff = differentiated; Undiff = undifferentiated; LVI = lymphovascular invasion; UL = ulcerative finding; HM = horizontal margin; VM = vertical margin; ER = endoscopic resection; EMR = endoscopic mucosal resection; ESD = endoscopic submucosal dissection; eCura = endoscopic curability.