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A prospective study using the largest data-base of its kind, collecting information on new potential risk factors for women and ultimately informing public health policies

The Million Women Study started recruiting participants more than 20 years ago, in 1996. The initial stimulus was to obtain robust prospective information on the risk of breast cancer associated with use of different types of menopausal hormone therapy.

Now, the study has enough data collected on women over a period of time to answer questions about the effects that factors have on multiple health conditions, using reliable large scale population-based evidence.

The study is led by Gillian Reeves, Director of the Cancer Epidemiology Unit at the Nuffield Department of Population Health.