Version June 2024
| Primary tumor (T) | |||
| T category | T criteria | ||
| TX | Primary tumor cannot be assessed (eg, curetted) | ||
| T0 | No evidence of primary tumor | ||
| Tis | In situ primary tumor | ||
| T1 | Maximum clinical tumor diameter ≤2 cm | ||
| T2 | Maximum clinical tumor diameter >2 but ≤5 cm | ||
| T3 | Maximum clinical tumor diameter >5 cm | ||
| T4 | Primary tumor invades fascia, muscle, cartilage, or bone | ||
| Regional lymph nodes (N) | |||
| Pathological (pN) | |||
| pN category | pN criteria | ||
| pNX | Regional lymph nodes cannot be assessed (eg, previously removed for another reason or not removed for pathological evaluation) | ||
| pN0 | No regional lymph node metastasis detected on pathological evaluation | ||
| pN1 | Metastasis in regional lymph node(s) | ||
| pN1a(sn) | Clinically occult regional lymph node metastasis identified only by sentinel lymph node biopsy | ||
| pN1a | Clinically occult regional lymph node metastasis following lymph node dissection | ||
| pN1b | Clinically and/or radiologically detected regional lymph node metastasis, microscopically confirmed | ||
| pN2 | In-transit metastasis (discontinuous from primary tumor; located between primary tumor and draining regional nodal basin, or distal to the primary tumor) without lymph node metastasis | ||
| pN3 | In-transit metastasis (discontinuous from primary tumor; located between primary tumor and draining regional nodal basin, or distal to the primary tumor) with lymph node metastasis | ||
| Distant metastasis (M) | |||
| Pathological (M) | |||
| M category | M criteria | ||
| M0 | No distant metastasis detected on clinical and/or radiologic examination | ||
| pM1 | Distant metastasis microscopically confirmed | ||
| pM1a | Metastasis to distant skin, distant subcutaneous tissue, or distant lymph node(s), microscopically confirmed | ||
| pM1b | Metastasis to lung, microscopically confirmed | ||
| pM1c | Metastasis to all other distant sites, microscopically confirmed | ||
| Prognostic stage groups | |||
| Pathological stage group (pTNM) | |||
| When T is... | And N is... | And M is... | Then the stage group is... |
| Tis | N0 | M0 | 0 |
| T1 | N0 | M0 | I |
| T2-3 | N0 | M0 | IIA |
| T4 | N0 | M0 | IIB |
| T1-4 | N1a(sn) or N1a | M0 | IIIA |
| T0 | N1b | M0 | IIIA |
| T1-4 | N1b-3 | M0 | IIIB |
| T0-4 | Any N | M1 | IV |
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