Gene therapy has the potential to wipe out many horrific and debilitating diseases, including Parkinson's disease, diabetes and some forms of cancer. As doctors pursue breakthroughs in gene therapy, they must overcome many ethical questions that surround the research as well as the unknown consequences of replacing faulty genes. This title examines the science behind gene therapy research in the following chapters: What is Gene Therapy? The Ideal Gene-Delivery Vehicle: Viruses, Attacking Bad Genes with Drugs, Stem Cells, Cloning and Gene Therapy, What is the Future of Gene Therapy?