Uterine fibroids are extremely common, occurring in 70 to 80% of women during their lifetime. On the other hand, finding a cancerous tumor during surgery to remove fibroids is extremely rare. There's no available test that can clearly tell the difference between a benign uterine fibroid and a cancerous tumor before removing it and performing a biopsy, but research is ongoing to improve this process. This resource has been created with support from Myovant Sciences and Pfizer.