Danazol reverses endometrial hyperplasia to normal endometrium.

Danazol, an isoxazol derivate of ethinyltestosterone, was used in the treatment of thirtyone postmenopausal patients with endometrial hyperplasia at the dose of 400 mg/day for three months. A profound growth-inhibitory effect of danazol on human endometrium was previously suggested. The present study shows that this compound is effective to reverse the endometrial hyperplasia to normal endometrium in 97% of cases. Atrophic changes of endometrial hyperplasia to normal endometrium after danazol-treatment were observed in 68% of patients. These results strongly suggest that danazol has a significant antiproliferative effect on the endometrium.