Table 2 Tumor classification of the international Federation of Obstetrics and Gynecology (FIGO). The surgical staging system is obligatory unless patients are to undergo primary radiotherapy when the older clinical staging system may be used.
From: Cancer of the endometrium: current aspects of diagnostics and treatment
| Stage | Stage – Clinical Staging | Stage – Surgical Staging | ||
|---|---|---|---|---|
| I | I | Carcinoma confined to corpus | Ia | Tumor limited to endometrium |
| Ia | Length of uterine cavity ≤ 8 cm | Ib | Invasion ≤ 1/2 myometrium | |
| Ib | Length of uterine cavity > 8 cm | Ic | Invasion > 1/2 myometrium | |
| II | II | Carcinoma involves corpus and cervix | IIa | Endocervical glandular involvement only |
| IIb | Cervical stromal invasion | |||
| III | III | Carcinoma extends outside uterus but not outside the true pelvis | IIIa | Tumor invades serosa or adnexa or positive peritoneal cytology |
| IIIb | Vaginal metastasis | |||
| IIIc | Metastases to pelvic or para-aortic lymph nodes | |||
| VI | IV | Carcinoma extents outside true pelvis or involves bladder or rectum | IVa | Tumor invades bladder, bowel mucosa, or both |
| IVb | Distant metastases, including intra-abdominal and/or inguinal lymph nodes | |||