AdvertisementHIV Cure Is Closer As Patient's Full Recovery Inspires New Research07:49Download AudioResumeJuly 18, 2012Richard KnoxfacebookEmailNurse Priscila-Grace Gonzaga with Gregg Cassin, a San Francisco gay man who has been infected with HIV since the early 1980s. He's a volunteer in a cutting-edge gene therapy experiment to see whether HIV-infected people can be given an immune system that is invulnerable to HIV infection. (NPR)