Our study will be in collaboration with Navigenics, the industry sponsor of this project. Navigenics will use a high density, genome microarray for determining the gene variants-, and published disease-association studies, to calculate the relative risk of each patient for a few targeted common diseases. High density microarrays are genome chips that allow the assessment of one million single nucleotide polymorphisms (SNPs) at relatively low cost. The combination of particular SNPs are presumed to influence the risk of developing certain common diseases as shown from genome-wide association studies published in peer-reviewed scientific and medical literature. Navigenics will use these population-based association studies (studies that produce odds ratios for developing a disease given a certain SNP) to estimate the relative of an individual patient developing a disease, an approach that is used by most direct-to-consumer genetic testing companies. They claim that their testing has a role in preventive medicine in order to "Help people live healthier lives." Our study will allow us to examine how patients and doctors respond to and utilize Navigenics' risk assessments derived from microarray technology and published genome-wide association studies.