Table 2.

The extent of lymph nodes dissection

cTNM stage	Extent of lymph nodes dissection
1. cT1a tumours that do not meet the criteria for EMR/ESD  2. cT1bN0 tumours that are histologically of differentiated type and 1.5 cm or smaller in diameter	D1 (No. 1, 3, 4sb, 4d, 5, 6, 7)
cT1N0 tumours other than the above	D1+No. 8a, 9
Potentially curable cT2–T4 tumours as well as cT1N+ tumours	D2 (D1+No. 8a, 9, 11p, 12a)

EMR, endoscopic mucosal resection; ESD, endoscopic submucosal dissection; TNM, tumour, node, metastases.