for kids. >> welcome to terminal four. >> she was delighted to find out that their new friend, andrew terrell> i'm heading to switzerland. i'm very excited to get back on the treatment. >> when andrew was part of a drug trial, each treatment protected him for two months. it worked so well, he didn't think twice about traveling 4,000 miles to zurich to get another implant. >> are you okay? >> totally painless. >> two weeks later, kristen and brady received a skype call. >> i hear you went to switzerland. >> i got a drug treatment. yeah. it's great. i'm actually out in the sun now. >> are you in central park? >> yep. i'm right here. lots of people out enjoying the day. >> do you want to ask him if he thinks you should do it some day? >> should i do it some day? >> absolutely. as soon as you have the chance. i'm hoping it comes to the states soon. >> in 2016 the drug got a fast-track from the fda but it is not approved. but since there's no guarantee that the drug will ever be developed for pediatric use, brady was looking forward to one special birthday, his 18th. >> i let him do a countdown. i