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The Two Sister Study is Underway! The “Two Sister Study,” an offshoot of the Sister Study, will focus on young-onset breast cancer. Although breast cancer is uncommon below age 50, women who develop the disease at a young age can tell us a lot about genetic and environmental causes. >> Read More The Sister Study is the only long-term study of women aged 35-74 whose sister had breast...

The Sister Study is the only long-term study of women aged 35-74 whose sister had breast cancer. It is a national study to learn how environment and genes affect the chances of getting breast cancer. The Sister Study has nearly reached its goal of enrolling 50,000 women. Currently, enrollment is limited to specific groups of women who are underrepresented in the study so that results will apply to...