Version June 2024
| The definitions of the T categories correspond to the stages accepted by the Fédération Internationale de Gynécologie et d'Obstétrique (FIGO). Both systems are included for comparison. | |||
| Primary tumor (T) | |||
| T category | FIGO stage | T criteria | |
| TX | Primary tumor cannot be assessed | ||
| T0 | No evidence of primary tumor | ||
| T1 | I | Tumor confined to the corpus uteri, including endocervical glandular involvement | |
| T1a | IA | Tumor limited to the endometrium or invading less than half the myometrium | |
| T1b | IB | Tumor invading one half or more of the myometrium | |
| T2 | II | Tumor invading the stromal connective tissue of the cervix but not extending beyond the uterus. Does NOT include endocervical glandular involvement. | |
| T3 | III | Tumor involving serosa, adnexa, vagina, or parametrium | |
| T3a | IIIA | Tumor involving the serosa and/or adnexa (direct extension or metastasis) | |
| T3b | IIIB | Vaginal involvement (direct extension or metastasis) or parametrial involvement | |
| T4 | IVA | Tumor invading the bladder mucosa and/or bowel mucosa (bullous edema is not sufficient to classify a tumor as T4) | |
| T suffix (m) if synchronous primary tumors are found in a single organ. | |||
| Regional lymph nodes (N) | |||
| N category | FIGO stage | N criteria | |
| NX | Regional lymph nodes cannot be assessed | ||
| N0 | No regional lymph node metastasis | ||
| N0(i+) | Isolated tumor cells in regional lymph node(s) no greater than 0.2 mm | ||
| N1 | IIIC1 | Regional lymph node metastasis to pelvic lymph nodes | |
| N1mi | IIIC1 | Regional lymph node metastasis (greater than 0.2 mm but not greater than 2.0 mm in diameter) to pelvic lymph nodes | |
| N1a | IIIC1 | Regional lymph node metastasis (greater than 2.0 mm in diameter) to pelvic lymph nodes | |
| N2 | IIIC2 | Regional lymph node metastasis to para-aortic lymph nodes, with or without positive pelvic lymph nodes | |
| N2mi | IIIC2 | Regional lymph node metastasis (greater than 0.2 mm but not greater than 2.0 mm in diameter) to para-aortic lymph nodes, with or without positive pelvic lymph nodes | |
| N2a | IIIC2 | Regional lymph node metastasis (greater than 2.0 mm in diameter) to para-aortic lymph nodes, with or without positive pelvic lymph nodes | |
| Suffix (sn) is added to the N category when regional lymph node metastasis is identified by sentinel lymph node biopsy only. Suffix (f) is added to the N category when metastasis is identified by fine needle aspiration (FNA) or core needle biopsy only. | |||
| Distant metastasis (M) | |||
| M category | FIGO stage | M criteria | |
| cM0 | No distant metastasis | ||
| cM1 | IVB | Distant metastasis (includes to inguinal lymph nodes, intraperitoneal disease, lung, liver, or bone). (It excludes metastasis to pelvic or para-aortic lymph nodes, vagina, uterine serosa, or adnexa.) | |
| pM1 | IVB | Distant metastasis (includes to inguinal lymph nodes, intraperitoneal disease, liver, or bone) microscopically confirmed. (It excludes metastasis to pelvic or para-aortic lymph nodes, vagina, uterine serosa, or adnexa.) | |
| Prognostic stage groups | |||
| When T is... | And N is... | And M is... | Then the stage group is... |
| T1 | N0 | M0 | I |
| T1a | N0 | M0 | IA |
| T1b | N0 | M0 | IB |
| T2 | N0 | M0 | II |
| T3 | N0 | M0 | III |
| T3a | N0 | M0 | IIIA |
| T3b | N0 | M0 | IIIB |
| T1-T3 | N1/N1mi/N1a | M0 | IIIC1 |
| T1-T3 | N2/N2mi/N2a | M0 | IIIC2 |
| T4 | Any N | M0 | IVA |
| Any T | Any N | M1 | IVB |
| Histologic grade (G) | |||
| G | G definition | ||
| GX | Grade cannot be assessed | ||
| G1 | Well differentiated | ||
| G2 | Moderately differentiated | ||
| G3 | Poorly differentiated | ||
| Histopathology: Degree of differentiation | |||
| Cases of carcinoma of the corpus uteri should be grouped according to the degree of differentiation of the endometrioid adenocarcinoma: | |||
| G | G definition | ||
| G1 | 5% or less of a nonsquamous or nonmorular solid growth pattern | ||
| G2 | 6-50% of a nonsquamous or nonmorular solid growth pattern | ||
| G3 | More than 50% of a nonsquamous or nonmorular solid growth pattern. Papillary serous, clear cell, and carcinosarcoma are considered high grade. | ||
NOTES on pathologic grading:
| |||
| Lymphovascular invasion (LVI) | |||
| Component of LVI coding | Description | ||
| 0 | LVI not present (absent)/not identified | ||
| 1 | LVI present/identified, NOS | ||
| 2 | Lymphatic and small vessel invasion only (L) | ||
| 3 | Venous (large vessel) invasion only (V) | ||
| 4 | BOTH lymphatic and small vessel AND venous (large vessel) invasion | ||
| 9 | Presence of LVI unknown/indeterminate | ||
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