For years, hormone replacement therapy (HRT) was hailed as a miracle. Study after study showed that HRT, if initiated at the onset of menopause, could ease symptoms ranging from hot flashes to memory loss; reduce the risk of heart disease, Alzheimer's, osteoporosis, and some cancers; and even extend a woman's overall life expectancy. But when a large study by the Women's Health Initiative announced results showing an uptick in breast cancer among...