Breast cancer causes
It is still not clear why some women and men develop breast cancer, but a number of risk factors have been identified.
Women who are told they are at a higher risk of developing breast cancer may never develop it, while others with a lower risk do.
Women will be invited for breast screening from their 50s to check for early signs of breast cancer - invitations will be offered to women from age 47 in the near future. However, women thought to be at a higher risk of developing breast cancer may be screened earlier.
Causes of breast cancer
Among the most significant factors are advancing age and a family history of breast cancer. Risk increases slightly for a woman who has had a benign breast lump and increases significantly for a woman who has previously had cancer of the breast or the ovaries.