Version June 2024
| Primary tumor (T) | |||
| TX | Primary tumor cannot be assessed | ||
| T0 | No evidence of primary tumor | ||
| Tis | Carcinoma in situ | ||
| T1 | Tumor invades lamina propria or muscular layer | ||
| T1a | Tumor invades lamina propria | ||
| T1b | Tumor invades muscular layer | ||
| T2 | Tumor invades perimuscular connective tissue; no extension beyond serosa or into liver | ||
| T3 | Tumor perforates the serosa (visceral peritoneum) and/or directly invades the liver and/or one other adjacent organ or structure, such as the stomach, duodenum, colon, pancreas, omentum, or extrahepatic bile ducts | ||
| T4 | Tumor invades main portal vein or hepatic artery or invades two or more extrahepatic organs or structures | ||
| Regional lymph nodes (N) | |||
| NX | Regional lymph nodes cannot be assessed | ||
| N0 | No regional lymph node metastasis | ||
| N1 | Metastases to nodes along the cystic duct, common bile duct, hepatic artery, and/or portal vein | ||
| N2 | Metastases to periaortic, pericaval, superior mesenteric artery, and/or celiac artery lymph nodes | ||
| Distant metastasis (M) | |||
| M0 | No distant metastasis | ||
| M1 | Distant metastasis | ||
| Anatomic stage/prognostic groups | |||
| Stage 0 | Tis | N0 | M0 |
| Stage I | T1 | N0 | M0 |
| Stage II | T2 | N0 | M0 |
| Stage IIIA | T3 | N0 | M0 |
| Stage IIIB | T1-3 | N1 | M0 |
| Stage IVA | T4 | N0-1 | M0 |
| Stage IVB | Any T | N2 | M0 |
| Any T | Any N | M1 | |
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