This study is looking at the links between hormone replacement therapy (HRT), breast cancer and other diseases.
The Million Women Study, which is one of the world's largest ever cohort studies, has recruited one million women from amongst those invited for breast screening.
The study is investigating how HRT affects a woman's breasts and other aspects of her health. Other factors being investigated include diet, childbirth, breastfeeding, vitamin and mineral supplement use, contraceptive and family history of illness. The study is being coordinated by Cancer Research UK.
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