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.