Table 2.

Descriptions of tumors found to have negligible risk of lymph node metastases

Gotoda et al. [25] (Total number of subjects: 5265)	Well-differentiated; <3 cm (0 of 1230)	Lesions without ulceration, regardless of other criteria (0 of 929)	Differentiated carcinomas <3 cm without lymphovascular invasion and limited invasion into submucosa (0 of 145)
Hirasawa et al. [26] (Total number of subjects: 3843)	Undifferentiated intramucosal lesions ≤2 cm, without lymphovascular invasions or ulcerative findings (0 of 310)