Gastric cancer in 2022: Is there still a role for endoscopic ultrasound?

Table 1 Tumor Nodes Metastasis (TNM) staging 8th Edition

	TNM staging
T
TX	Primary tumour cannot be assessed
T0	No evidence of primary tumour
Tis	Carcinoma in situ
T1a	Tumour invades lamina propria or muscularis mucosae
T1b	Tumour invades submucosa
T2	Tumour invades muscularis propria
T3	Tumour penetrates subserosal tissue without invasion of visceral peritoneum or adjacent structures
T4a	Tumour penetrates serosa (visceral peritoneum)
T4b	Tumour directly invades adjacent organs or structures
N
NX	Regional lymph nodes(s) cannot be assessed
N0	No regional lymph node metastases

TNM staging: Tumor nodes metastasis staging.