Primary tumor (T) |
T category | T criteria |
TX | Primary tumor cannot be assessed |
T0 | No evidence of primary tumor |
T1 | Tumor 2 cm or less in greatest dimension |
T2 | Tumor more than 2 cm but less than or equal to 4 cm |
T3 | Tumor more than 4 cm or with subserosal invasion or involvement of the mesoappendix |
T4 | Tumor perforates the peritoneum or directly invades other adjacent organs or structures (excluding direct mural extension to adjacent subserosa of adjacent bowel), eg, abdominal wall and skeletal muscle |
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 |
M1a | Metastasis confined to liver |
M1b | Metastases in at least one extrahepatic site (eg, lung, ovary, nonregional lymph node, peritoneum, bone) |
M1c | Both hepatic and extrahepatic metastases |
Prognostic stage groups |
When T is... | And N is... | And M is... | Then the stage group is... |
TX, T0 | NX, N0, N1 | M1 | IV |
T1 | N0 | M0 | I |
T1 | N1 | M0 | III |
T1 | NX, N0, N1 | M1 | IV |
T2 | N0 | M0 | II |
T2 | N1 | M0 | III |
T2 | NX, N0, N1 | M1 | IV |
T3 | N0 | M0 | II |
T3 | N1 | M0 | III |
T3 | NX, N0, N1 | M1 | IV |
T4 | N0 | M0 | III |
T4 | N1 | M0 | III |
T4 | NX, N0, N1 | M1 | IV |