Gene therapy is a technique that offers the potential to replace defective copies of genes in any genetic disease with an intact version.  While the idea of this treatment sounds alluring, the actual practice of it is a whole other story.  There are a few drawbacks to this technique that must be considered, including the potential risk of an immune response because the gene is inserted with the use of a virus, which the immune system will see as foreign.   Also, most patients so far have needed multiple treatments over the course of their lifetime, estimating to cost much more More >