U.S. news media serve a critical health education service in the provision of timely, accurate information (Brown & Walsh-Childers, 2002; Chapman & Lupton, 1994). For this reason, this study investigates the presentation of genetic research relating to cancer outcomes and behaviors (i.e., prostate cancer, breast cancer, colon cancer, smoking and obesity) from its original presentation in a scholarly journal (N=20), through an intermediary press release (N=23), to its publication in mainstream print media (N=71). Central claims, expressing gene-outcome relationships, were extracted and evaluated by expert raters. Raters judged claims within the press release as being significantly more representative of the material within the original science journal article compared with news article claims. Findings partially support a social constructivist approach to science reporting. That is, claims originating in news articles which demonstrated contact with individuals not directly involved in the research were judged by experts to be more representative of the original science as compared with those that demonstrated contact with individuals directly involved in the research. Our evaluation methods prove to be highly reliable and valid, contributing to future research by providing an alternate approach (i.e. expert raters as "parallel instruments") to evaluating complex science and its presentation in subsequent sources. ..PAT.-Unpublished Manuscript [ABSTRACT FROM AUTHOR]