Version May 2024
| Primary tumor (T) | |||
| TNM categories | FIGO stages | Definition | |
| TX | Primary tumor cannot be assessed | ||
| T0 | No evidence of primary tumor | ||
| T1 | I | Tumor confined to ovaries or fallopian tubes | |
| T1a | IA | Tumor limited to one ovary (capsule intact) or fallopian tube; no tumor on ovarian or fallopian tube surface; no malignant cells in ascites or peritoneal washings | |
| T1b | IB | Tumor limited to both ovaries (capsules intact) or fallopian tubes; no tumor on ovarian or fallopian tube surface; no malignant cells in ascites or peritoneal washings | |
| T1c | IC | Tumor limited to one or both ovaries or fallopian tubes, with any of the following: | |
| IC1 | Surgical spill | ||
| IC2 | Capsule ruptured before surgery or tumor on ovarian or fallopian tube surface | ||
| IC3 | Malignant cells in the ascites or peritoneal washings | ||
| T2 | II | Tumor involves one or both ovaries or fallopian tubes with pelvic extension (below pelvic brim) or peritoneal cancer* | |
| T2a | IIA | Extension and/or implants on uterus and/or tube(s) and/or ovaries | |
| T2b | IIB | Extension to other pelvic intraperitoneal tissues | |
| T3 | III | Tumor involves one or both ovaries or fallopian tubes, or peritoneal cancer, with cytologically or histologically confirmed spread to the peritoneum outside the pelvis and/or metastasis to the retroperitoneal lymph nodes | |
| T3a | IIIA | Positive retroperitoneal lymph nodes and/or microscopic metastasis beyond pelvis | |
| IIIA1 | Positive retroperitoneal lymph nodes only (cytologically or histologically proven) | ||
| IIIA1 (i) | Metastasis up to 10 mm in greatest dimension | ||
| IIIA1 (ii) | Metastasis more than 10 mm in greatest dimension | ||
| IIIA2 | Microscopic extrapelvic (above the pelvic brim) peritoneal involvement, with or without positive retroperitoneal lymph nodes | ||
| T3b | IIIB | Macroscopic peritoneal metastasis beyond pelvis up to 2 cm in greatest dimension, with or without positive retroperitoneal lymph nodes | |
| T3c | IIIC | Macroscopic peritoneal metastasis beyond pelvis more than 2 cm in greatest dimension (includes extension of tumor to capsule of liver and spleen without parenchymal involvement of either organ), with or without positive retroperitoneal lymph nodes | |
| Regional lymph nodes (N) | |||
| TNM categories | FIGO stages | Definition | |
| NX | Regional lymph nodes cannot be assessed | ||
| N0 | No regional lymph node metastasis | ||
| N1 | III | Regional lymph node metastasis | |
| Distant metastasis (M) | |||
| TNM categories | FIGO stages | Definition | |
| M0 | No distant metastasis | ||
| M1 | IV | Distant metastasis (excludes peritoneal metastasis) | |
| IVA | Pleural effusion with positive cytology | ||
| IVB | Parenchymal metastases and metastases to extra-abdominal organs (including inguinal lymph nodes and lymph nodes outside the abdominal cavity)¶ | ||
| pTNM pathologic classification. The pT, pN, and pM categories correspond to the T, N, and M categories. | |||
| Anatomic stage/prognostic groups | |||
| Stage I | T1 | N0 | M0 |
| Stage IA | T1a | N0 | M0 |
| Stage IB | T1b | N0 | M0 |
| Stage IC | T1c | N0 | M0 |
| Stage II | T2 | N0 | M0 |
| Stage IIA | T2a | N0 | M0 |
| Stage IIB | T2b | N0 | M0 |
| Stage IIC | T2c | N0 | M0 |
| Stage III | T3 | N0 or N1 | M0 |
| Stage IIIA | T3a | N0 | M0 |
| ≤T3a | N1 | ||
| Stage IIIB | T3b | N0 or N1 | M0 |
| Stage IIIC | T3c | N0 or N1 | M0 |
| Stage IV | Any T | Any N | M1 |
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