just like gieve gregg--once he was given xolair, his life changed. this photo shows the difference in gieve's skin test between february and december of 2015. >> what happened is night and day. he went in one day with intervals of half an hour they went 5, 50, 150, 300, 625, and 1,250 miligrams in one day! >> so it's completely changed the game. >> not even close yeah yeah. >> hi gieve how are you? how's the dose today? >> [laughter] is it pretty good? that's so great! >> gieve's success created a lot of optimism. others like lauren are now part of the trial supported through the national institutes of health. >> so you're going to get another xolair shot and then we're going to introduce your foods. >> we used the multi-therapy that was customized to what the person was allergic to, in addition to the xolair and that combination really helped patients. >> get all the scrapings out. like that, nice and clean cause it's stuck on the back too. >> coming up. >> wow that's big. >> our own phil torres takes us inside his own battle with a peanut allergy. >