Table 2 Comparison between the oesophageal and gastric TNM staging [34]
Oesophageal staging | Gastric staging | |||
|---|---|---|---|---|
T Stage | T0 | No evidence of primary tumour | T0 | No evidence of primary tumour |
Tis | Carcinoma in situ | Tis | Carcinoma in situ | |
T1 | Tumour invades lamina propria or submucosa | T1 | Tumour invades lamina propria or submucosa | |
T2 | Tumour invades muscularis propria | T2a | Tumour invades muscularis propria | |
T3 | Tumour invades adventitia | T2b | Tumour invades subserosa | |
T4 | Tumour invades adjacent structures | T3 | Tumour penetrates serosa (visceral peritoneum) without invasion of adjacent structures | |
T4 | Tumour invades adjacent structures | |||
N Stage | NX | Regional lymph nodes cannot be assessed | NX | Regional lymph nodes cannot be assessed |
N0 | No regional lymph node metastases | N0 | No regional lymph node metastases | |
N1 | Regional lymph node metastases | N1 | Metastases in 1 to 6 regional lymph nodes | |
N2 | Metastases in 7 to 15 regional lymph nodes | |||
N3 | Metastases in more than 15 regional lymph nodes | |||
M Stage | MX | Distant metastases cannot be assessed | MX | Distant metastases cannot be assessed |
M0 | No distant metastases | M0 | No distant metastases | |
M1a | Metastases to coeliac or cervical lymph nodes | M1 | Distant metastases | |
M1b | Other distant metastases |