Uterine sarcoma is an uncommon form of uterine cancer that forms in the muscle and tissue that support the uterus.
Obesity, certain inherited conditions, and taking estrogen alone (without progesterone) can increase the risk of endometrial cancer. Radiation therapy to the pelvis can increase the risk of uterine sarcoma. Taking tamoxifen for breast cancer can increase the risk of both endometrial cancer and uterine sarcoma. Learn more from the National Cancer Institute.