Primary tumor (T) |
T category | T criteria |
TX | Primary tumor cannot be assessed |
T0 | No evidence of primary tumor |
T1 | Solitary tumor ≤2 cm, or >2 cm without vascular invasion |
T1a | Solitary tumor ≤2 cm |
T1b | Solitary tumor >2 cm without vascular invasion |
T2 | Solitary tumor >2 cm with vascular invasion, or multiple tumors, none >5 cm |
T3 | Multiple tumors, at least one of which is >5 cm |
T4 | Single tumor or multiple tumors of any size involving a major branch of the portal vein or hepatic vein or tumor(s) with direct invasion of adjacent organs other than the gallbladder or with perforation of visceral peritoneum |
Regional lymph nodes (N) |
N category | N criteria |
NX | Regional lymph nodes cannot be assessed |
N0 | No regional lymph node metastasis |
N1 | Regional lymph node metastasis |
Distant metastasis (M) |
M category | M criteria |
M0 | No distant metastasis |
M1 | Distant metastasis |
Prognostic stage groups |
When T is... | And N is... | And M is... | Then the stage group is... |
T1a | N0 | M0 | IA |
T1b | N0 | M0 | IB |
T2 | N0 | M0 | II |
T3 | N0 | M0 | IIIA |
T4 | N0 | M0 | IIIB |
Any T | N1 | M0 | IVA |
Any T | Any N | M1 | IVB |