Sister Study: A Study of the Environmental and Genetic Risk Factors for Breast Cancer
Internet URL
http://www.sisterstudy.org/English/index1.htm 
This document also available in Spanish
Sponsoring Agency
National Institute of Environmental Health Sciences, National Institutes of Health
Description
The Sister Study is the only long-term study of women aged 35 to 74 whose sister had breast cancer. It is a national study conducted by the National Institute of Environmental Health Sciences (NIEHS) to learn how environment and genes affect the chances of getting breast cancer.