Uterine fibroids are a benign but common condition among women in reproductive age. It is one of the most common reasons for hysterectomy since it often causes bleeding problems sometimes leading to anemia. Several alternative treatment regimens have been investigated that could replace surgery. The antiprogesterone, mifepristone, is one of the most promising drugs that have been tested. In addition to the inhibiting effect on the growth of uterine fibroids antiprogestins have been proposed to have an antiproliferative effect on breast tissue.