The New American Joint Committee on Cancer T staging system for stomach: increased complexity without clear improvement in predictive accuracy for endoscopic ultrasound

Table 1 Changes in the AJCC T staging system for gastric cancer

Tumor	AJCC 6th ed.	AJCC7th ed.	AJCC8th ed.
T: Primary tumor
Depth of invasion
No evidence of primary tumor	T0	T0	T0
Carcinoma-in-situ	Tis	Tis	Tis
Lamina propria or muscularis mucosa	T1	T1	T1
Or submucosa	T1	T1	T1
Muscularis propria	T2	T2	T2
Subserosa	T2	T3	T3
Serosa	T3	T4	T4
Adjacent structures	T4	T4	T4

For AJCC 6th edition: T1: tumor invasion limited to the mucosal or submucosal layer; T2: destruction of the muscularis propria or subserosal layer (T3 for AJCC 7th/8th edition); T3: cancer penetrating the serosa ((T4 for AJCC 7th/8th edition)); and T4: disease invasion in the vicinity of the stomach or other organs

ISSN: 1471-230X