Million Women Study

Million Women Study2016-12-27T23:25:23+00:00

Million Women Study 


A (UK) national study of involving more than one million UK women aged 50 and over, which is a collaboration between Cancer Research UK and the NHS, partly funded by the Medical Research Council and Health and Safety Executive (UK Government).

Whilst the primary focus is on the effects of hormone replacement therapy–HRT use, the large size of the study allows other questions to be asked, including how various reproductive and lifestyle factors affect older womens’ health. The MWS is also assessing how diet, exercise, employment patterns, oral contraceptive use, childbirth and breast feeding, and family history of illness impact on cancer and to other conditions such as fractures, gallbladder disease and cardiovascular disease.

Logistics Recruitment occurred between 1996 and 2001 with an invitation to attend breast screening at one of 66 participating NHS Breast Screening Centres; 70% of the attendees agreed to participate. Over 1 in 4 women in the target age group participate in the Study, making the MWS the largest such study in the world.

Conclusion For every 10,000 women on oestrogen for 10 years, there will be 5 extra breast cancers, and 19 extra cancers in women receiving combined HRT. The study is ongoing…


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