I. INTRODUCTION With the completion of the Human Genome Project and the advent of increasingly sophisticated genetic technologies, the promise that genetic advances will revolutionize medicine appears closer than ever. Soon, tests will function as medical crystal balls, forecasting risks of disease years into the future based on genetic variations. Medical care might soon benefit from tests that accurately predict the risk of common diseases with complex etiologies, such as cancers, Parkinson's disease, or Alzheimer's disease. (1)
