Gene therapy is the introduction of a gene sequence into a cell with the aim of modifying the cell's behaviour in a clinically relevant fashion. It may be used in several ways i.e. to correct a genetic mutation (as for cystic fibrosis), to kill a cell (as for cancer) or to modify susceptibility (as for coronary artery disease). The gene may be introduced using a virus (usually a retrovirus or adenovirus) or by means of lipids or receptor targeting. There is now almost universal agreement that gene delivery to somatic cell to disease is ethical, and that gene therapy should take its place along side other forms of medical treatment.[40]
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