The Vincent T Lombardi Cancer Center, Georgetown University School of Medicine, Washington, DC, USA. clarker@gunet.georgetown.edu
Breast cancer is among the most common of the cancers that occur in women living in western societies. It is a much-feared disease and the risks are confusing and often badly reported. Oestrogen levels are a known risk factor. But is it possible to lower the risk? And where are all the oestrogens coming from?