what is uterine stromal cancer
9 Warning Signs of Type 2 Diabetes. One of the rarest types of uterine cancer is endometrial stromal sarcoma (ESS), a uterine cancer that accounts for less than 1 percent of cancers of the reproductive organs.lthough the cause of this type of uterine cancer is not clear, possible risk factors include: 1  Prior use of medications that affect the hormone estrogen, such as nolvadex (Tamoxifen) . 2  Radiation of the uterus or pelvic area between 5 and 25 years earlier.