Over time, a number of clinical studies showed that asymptomatic women given regular mammography have a lower breast cancer death rate compared with women who do not get mammography.

CNN: Should I get a mammogram?

This suggests that lower overall breast cancer survival in the UK is not because women are being diagnosed at a later stage than in other countries, the study says.

BBC: A mammography of a woman's breast

Women who took aspirin had a 13 percent lower risk of breast cancer than those who didn't, while those who took ibuprofen had a 21 percent lower risk.

CNN: Study: Aspirin, ibuprofen may cut breast cancer risk