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 |
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