Senior author Professor Anthony Swerdlow from The Institute of Cancer Research said:
By following such a large group of women over such a long time period, we have created the most detailed picture yet of the risk that these women face. Importantly, our study enables this group of women to receive clear information about their personal breast cancer risk, to help their doctors and them to make decisions about preventive measures. It takes us a step closer to more-personalised medical plans."
More top news
Two boys from Oldham have been sentenced after an horrific attack which left a teenager with brain damage.
A video showing the moment a carriage on the Smiler rollercoaster at Alton Towers crashed into an empty car has been shown in court.
A mixed week ahead