Gene Therapy 101....get some cells, get a virus. Convert the virus to The Good Side. Stick some gene into the virus. Get virus to "infect" (i.e. enter) the cells. Cure cells. Infamous for its potential applications in: sickle cell, cystic fibrosis, thalassaemia....anything genetic. Unfortunately, this isn't a miracle as the press claims. It's incredibly hard to get it to work, and treatment with gene therapy would still be lifelong.