Tx/pTx | Primary tumour cannot be assessed | |
T0/pT0 | No evidence of primary tumour | |
Tis/pTis | Carcinoma in situ | Carcinoma in situ (intraepithelial or intramucosal, with invasion of lamina propria) |
T1/pT1 | Tumour invades submucosa | |
T2/pT2 | Tumour invades muscularis propria | |
T3/pT3 | Tumour invades through muscularis propria into subserosa or into non-peritonealised pericolic or perirectal tissues | |
T4/pT4 | Tumour directly invades other organs or structures and/or perforates visceral peritoneum* | |
Nx/pNx | Regional LNs cannot be assessed | |
N0/pN0 | No regional LN metastasis | |
N1/pN1 | Metastasis to 1–3 pericolic or perirectal LNs | Metastasis to 1–3 regional LNs |
N2/pN2 | Metastasis to 4 or more pericolic or perirectal LNs | Metastasis to 4 or more regional LNs |
N3/pN3 | Metastasis to LNs along the course of a named vascular trunk | No N3/pN3 category |
Mx/pMx | Distant metastasis cannot be assessed | |
M0/pM0 | No distant metastasis | |
M1/pM1 | Distant metastasis | |