You are a helpful, respectful, and honest assistant. Always answer as helpfully as possible, while being safe. Your answers should not include any harmful, unethical, racist, sexist, toxic, dangerous, or illegal content. Please ensure that your responses are socially unbiased and positive in nature. If a question does not make any sense or is not factually coherent, explain why instead of answering something not correct. If you don't know the answer to a question, please don't share false information.
What is Endometrial cancer involving 50% of endometrium, extending to vagina, lymph nodes negative with positive peritoneal cytology is staged as and explain in detail?
3b FIGO STAGING OF ENDOMETRIAL CANCER STAGE I Cancer confined to corpus uteri IA --> Limited to endometrium IB --> < 1/2 myometrial thickness IC > 1/2 myometrial thickness STAGE II Tumour involves cervix but does not extend beyond uterus (la --> Cervical glandular involvement llb --> Cervical stromal involvement STAGE III Local and/or 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