air marshal, darell joyner. what do you make of this?>> i think it's pretty -- you have situation as the pilot or the co-pilot locked out of the cockpit door which tells me potentially that he was locked out from the inside. i believe some of the reinforced doors that there's a second lock mechanism that can be controlled from the inside. i mean clearly this speaks to potentially the pilot passing out because i think they have some type of code where they're going to make sure that they're keeping everything safe. because he or she goes outside could potentially be under duress if anything goes down in the cabin and the pilot would remain safe. if that was the case and you pass out and you're pretty much out of luck you're not going to be able to get back inside or if there was a plan or somebody possibly went inside when the co-pilot came outside, or potentially if the pilot who was inside actually had a plan to do harm to the aircraft. he or she would have the opportunity to do so once the co-pilot is outside the door. >> darelle, it i

darell bigner is the head of the study and of duke's brain tumor center. years, and he told us he has never seen results like those in patients fritz andersen and stephanie lipscomb. based on what you have seen, is it fair to say that stephanie and fritz are in remission? >> darell bigner: oh absolutely. that's probably a very good term to use. they're in remission, and i think they would tell you that they consider themselves normal again. >> pelley: cured? >> bigner: you know, i'm very reluctant to use the "cure" word-- the "c" word, as we call it-- because we don't know how long it takes to say that a glioblastoma has been cured. but i am beginning to think about it. >> desjardins: close your eyes for me. what side am i touching you on? >> nancy justice: oh, my left. >> pelley: but what they've achieved in this rare form of cancer may be just the beginning. molecular biologist matthias gromeier, the creator of the virus, is pressing ahead. you have been testing this therapy against a number of other cancers just in a laboratory dish. >> gromeier: yes. >