Version May 2024
| Primary tumor (T) | |||
| T category | T criteria | ||
| TX | Primary tumor not assessed | ||
| T0 | No evidence of primary tumor | ||
| Tis | High-grade squamous intraepithelial lesion (previously termed carcinoma in situ, Bowen disease, anal intraepithelial neoplasia II-III, high-grade anal intraepithelial neoplasia) | ||
| T1 | Tumor ≤2 cm | ||
| T2 | Tumor >2 cm but ≤5 cm | ||
| T3 | Tumor >5 cm | ||
| T4 | Tumor of any size invading adjacent organ(s), such as the vagina, urethra, or bladder | ||
| Regional lymph nodes (N) | |||
| N category | N criteria | ||
| NX | Regional lymph nodes cannot be assessed | ||
| N0 | No regional lymph node metastasis | ||
| N1 | Metastasis in inguinal, mesorectal, internal iliac, or external iliac nodes | ||
| N1a | Metastasis in inguinal, mesorectal, or internal iliac lymph nodes | ||
| N1b | Metastasis in external iliac lymph nodes | ||
| N1c | Metastasis in external iliac with any N1a nodes | ||
| 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... |
| Tis | N0 | M0 | 0 |
| T1 | N0 | M0 | I |
| T1 | N1 | M0 | IIIA |
| T2 | N0 | M0 | IIA |
| T2 | N1 | M0 | IIIA |
| T3 | N0 | M0 | IIB |
| T3 | N1 | M0 | IIIC |
| T4 | N0 | M0 | IIIB |
| T4 | N1 | M0 | IIIC |
| Any T | Any N | M1 | IV |
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