Ex vivo gene therapy diflers from in vivo gene therapy in thet Mutiple Croice ex vivo gene therepy involves directly introducing the gene into the body. In vivo gene therapy involves drectly introducing the gese inta the body. in vivo gene therapy only employs viruses for geve trwoster. ex vivo gene therapy only employs viruses for gene translec. ex vivo gene therapy can employ viruses, nawal sprayt, or liposomes for gene translec, but only lposomes may be used for in vivo geve therapy.