Version May 2024
| 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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