<prompt> Endometrial cancer involving 50 of endometrium, extending to vagina, lymph nodes negative with positive peritoneal cytology is staged as3a3b3c13c2  <response>: 3b FIGO STAGING OF ENDOMETRIAL CANCER STAGE I Cancer confined to corpus uteri IA -- Limited to endometrium IB -- 12 myometrial thickness IC 12 myometrial thickness STAGE II Tumour involves cervix but does not extend beyond uterus la -- Cervical glandular involvement llb -- Cervical stromal involvement STAGE III Local andor regional spread Ilia -- Uterine serosa, positive peritoneal washings Adnexal involvement Ilib -4 Vaginal involvement lymph node absent 111c -- Positive lymph node no pelvis and paraaoic lymph node STAGE IV Tumour widespread IVa - Bladder or bowel mucosa IVb -- Distant metastasis 