"Gene therapy, involving the use of viruses as a vector for introducing generic material into cells, has had some success in treating genetic disorders such as severe combined immunodeficiency, and treatments are being developed for a range of other currently incurable diseases such as cystic fibrosis, sickle cell anemia, and muscular dystrophy. Genes introduced in this manner are not transmitted to the next generation. Gene therapy targeting the reproductive cells—so-called “Germ line Gene Therapy”—at present carries an unquantifiable risk associated with interfering with other genes, hence near-term development and commercialization of this technology is unlikely."