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Using, putting the genes in with the hiv virus which normally invades t-cells anyway, that is how hiv kills people, it kills your t-cells. so by normally doing that and then programing it through genes to kill the b-cells, it is picking up a protein on the b-cell but on the healthy b-sells and cancer russ b-cells. so that is the draw back. jenna: when you genetically modify hiv virus do you have a risk of getting the virus down the line? >> no, it is pretty much gutted out. normally it would invade a t-cell and multiplying very fast and break out and invade more t-cells and kill your t-cells. ...

Procedure in a last-ditch effort to save her life. six months later apparently she is doing okay. dr. lee vinocur of lsu is with us now. let's go through this step by step, doctor. why a disabled form of hiv? >> well it is interesting. it is a form of immune therapy and hiv is a virus that invades t-cells and very frequently we use viruses as vehicles to get into cells and by using the t-cells, the t cells get targeted and engineered to kill her b-cells which are the cells that have gone haywire and caused lukemia. jenna: t-cells if i could, are like watchdogs in your body. when an intruder co...

Viewers during the treatment, there are moments where you get very, very sick. one doctor called it the shake and bakes. when you get this stuff out of your system. this little girl almost died during this treatment. now, of course now she is doing well and happy for her. >> right. jenna: some suggest, doc, that this could replace bone marrow transplants? how big of a deal do you think it is getting closer to the cure for cancer? >> well i think that it is a pretty big deal and it is modulating the immune system. it is a targeted personal therapy so not one, it is genetically engineered just f...