At the San Antonio Breast Cancer Symposium in December 2006, Dr. Peter Ravdin presented a hypothesis that the WHI study, which showed that combined HRT increased the risk of breast cancer, ultimately led many women to stop HRT, and as a result, the number of breast cancer diagnoses dropped in the following months and years. However, debate emerged over the cause of the decline in diagnoses-was it decreased use of HRT or the fact that fewer women were getting mammograms? The article explores both hypotheses and tracks the data, giving a clear answer to why breast cancer cases dropped.
