Observational studies conducted in the 1980s and 1990s indicated that women in therapy hormone replacement (HRT) had reduced symptoms of menopause compared to women who were not on replacement therapy hormonal. More recently, experiments with hormone replacement therapy revealed that women on HRT have an increased risk of breast cancer. What studies should we believing they are telling us the truth about the efficacy and / or risk of replacement therapy hormonal? Please provide an explanation of why there was a difference.

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