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Methods: Individual data on 52, women with breast cancer and , women without breast cancer from 51 studies in 21 countries were collected, checked, and analysed centrally. Estimates of the relative risk of breast cancer associated with the use of HRT were obtained after stratification of all analyses by study, age at diagnosis, time since menopause, body-mass index, parity, and the age a woman was when her first child was born. Findings: Among current users of HRT or those who ceased use years previously, the relative risk of having breast cancer diagnosed increased by a factor of 1. This increase is comparable with the effect on breast cancer of delaying menopause, since among never-users of HRT the relative risk of breast cancer increases by a factor of 1.

Each breast contains 15 to 20 lobes of glandular tissue, arranged like the petals of a daisy. The lobes are further divided into smaller lobules that produce milk for breastfeeding. Small tubes ducts conduct the milk to a reservoir that lies just beneath your nipple. I'm Dr. Judy Boughey, a breast surgeon at Mayo Clinic.

Back to Breast cancer in women. The causes of breast cancer are not fully understood, making it difficult to say why one woman may develop breast cancer and another may not. However, there are risk factors known to affect your likelihood of developing breast cancer.

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