The Sister Study Cohort: Baseline Methods and Participant Characteristics
Author Affiliations open 1Epidemiology Branch, National Institute of Environmental Health Sciences (NIEHS), National Institutes of Health (NIH), Department of Health and Human Services (DHHS), Research Triangle Park, North Carolina, USA 2Social &Scientific Systems, Inc., Durham, North Carolina, USA 3Westat, Durham, North Carolina, USA 4Department of Global Public Health and Primary Care, University of Bergen, Bergen, Norway 5Biostatistics and Computational Biology Branch, NIEHS, NIH, DHHS, Research Triangle Park, North Carolina, USA PDF Version (548 KB) Abstract About This Article Supplemental Material Background: The Sister Study was designed to address gaps in the study of environment and breast cancer by taking advantage of more frequent breast cancer diagnoses among women with a sister history of breast cancer and the presumed enrichment of shared environmental and genetic exposures. Objective: The Sister Study sought a large cohort of women never diagnosed with breast cancer but who had a sister (full or half) diagnosed with breast cancer. Methods: A multifaceted national effort employed novel strategies to recruit a diverse cohort, and collected biological and environmental samples and extensive data on potential breast cancer risk factors. Results: The Sister Study enrolled 50,884 U.S. and Puerto Rican women 35–74 y of age (median 56 y). Although the majority were non-Hispanic white, well educated, and economically well off, substantial numbers o...
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