Table 1.

Comparison of T stage of gastric NENs between ENETS and UICC.

	ENETS	UICC
Tis	In situ tumor/dysplasia (<0.5 mm)	Mucosa 0.5 mm
T1	Tumor invades lamina propria or submucosa and ≤1 cm	Mucosa 0.5–1 cm or submucosa ≤1 cm
T2	Tumor invades muscularis propria or subserosa or >1 cm	Muscularis propria or >1 cm
T3	Tumor penetrates serosa	Subserosa
T4	Tumor invades adjacent structures	Perforates serosa; adjacent structures