Attention sisters

Researchers trying to find environmental causes of breast cancer--diet, exercise, exposure to chemicals or other factors--will start recruiting 50,000 sisters on Saturday for study.

The government-funded teams will start in Florida, at a fund-raising event in Tampa called the "Race for the Cure."

They hope to sign up 50,000 women nationally, aged 35 to 74, whose sisters have been diagnosed with breast cancer.

Sisters of women with breast cancer have up to twice the breast cancer risk of other women. A few genetic mutations are associated with breast cancer risk, but they account for fewer than 10% of cases.

Much more here.