In this resource, we will explore SNPs and genome wide association studies in more detail. We will first review the basics of DNA as a foundation to understanding SNPs. We will thendiscuss genome-wide association studies, including relevant definitions, study procedures, andtypes of information that can be obtained. Finally, we will consider how genome-wideassociation studies may benefit us in the future as part of the trend toward personalizedmedicine and some real-life examples of genome-wide association studies in breast cancer.