The uterus is a part of the female reproductive organ. The function of the uterus includes nourishing and developing the fetus during pregnancy. Uterine cancer includes endometrial cancer and uterine sarcoma. While endometrial cancer, the most common type of uterine cancer, initiates in the lining of the uterus, Uterine Sarcoma develops in the myometrium (muscle tissue). Adenocarcinoma of the endometrium is known as uterine carcinoma.