1. Many experts think most breast cancer results from overexposure to estrogen . 2. The estrogen hypothesis is one of the most controversial in science. 3. By taking progestin with estrogen , postmenopausal women avoided cell overgrowth. 4. I feel very strongly that women should continue to take estrogen , 5. Pfizer Inc . is developing its own mock estrogen treatment Droloxifene. 6. The risk of fractures is reduced about 45 percent with estrogen . 7. So what do you think of all the controversy over estrogen ? 8. They say that estrogen could reduce the risk of heart disease. 9. The risk rises to about 3 percent if she takes estrogen . 10. She began estrogen replacement therapy and gradually built up the dosage.