National Institute of Environmental Health Sciences   —  National Institutes of Health   —  U.S. Department of Health and Human Services

The Sister Study


Please Complete Your Health Update For a Chance to Win $500!

Sisters, starting in October 2023, we are contacting you to complete either your Annual Health Update or your more in-depth Detailed Health Update (asked every three years). Please check your emails or mail to complete your questions. To show our appreciation, when you complete the questions, you will be entered into a $500 gift card drawing. Thank you!

The Sister Study is Still Going Strong After 20 Years!

October is breast cancer awareness month and we are commemorating the 20th Anniversary of the NIEHS Sister Study —the nation's longest and largest study to find environmental and genetic causes of breast cancer. Be sure to see the new Sister Study video and other products.


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