Role of carbon nanotracers in lymph node dissection of advanced gastric cancer and the selection of preoperative labeling time

Table 1 Lymphnodes dissection extent in laparoscopic total gastrectomy

Lymphnodes dissection extent	Lymphadenectomy
LTG
D1	No. 1-7
D2	D1 + No. 8a, 9, 10, 11p, 11d, 12a
LSG
D1	No. 1, 3, 4sb, 4d, 5, 6, 7
D2	D1 + No. 8a, 9, 11p, 12a

For tumors invading the esophagus, D2 includes No. 19, 20, 110 and 111. LTG: Laparoscopic total gastrectomy; LSG: Laparoscopic subtotal gastrectomy.