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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