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 |