Adjuvant therapy for gastric cancer: Current and future directions

Table 1 American Joint Committee on Cancer 6^thvs 7^th edition staging of gastric cancer

	AJCC 6th		AJCC 7th
T1	Tumour invades lamina propria or submucosa	T1a	Invades Lamina propria or muscularis mucosae
		T1b	Invades Submucosa
T2a	Invades Muscularis propria	T2	Invades Muscularis propria
T2b	Invades Subserosa
T3	Penetrates Serosa (visceral peritoneum), without invasion of adjacent structures	T3	Penetrates subserosal connective tissue without invasion of visceral peritoneum or adjacent structures
T4	Invades adjacent structures	T4a	Tumor invades serosa (visceral peritoneum)
		T4b	Tumor invades adjacent structures
N1	1-6 nodes involved	N1	1-2 nodes involved
N2	7-15 nodes involved	N2	3-6 nodes involved
N3	> 15 nodes involved	N3a	7-15 nodes involved
		N3b	> 15 nodes involved

AJCC: American Joint Committee on Cancer.