dr. annick desjardins cut the potency of nancy's infusion by 85%. ver intended to use in the study. even so, dr. desjardins expected a big immune response. >> desjardins: in the next four to six months, we should see the inflammations, so the immune system waking up, starting to kill the tumor. >> pelley: you will expect to see her m.r.i. look worse in the early days? >> desjardins: yes, absolutely. >> pelley: before it gets better. >> desjardins: absolutely. >> pelley: it certainly did. after she returned to georgia, nancy's symptoms started to resemble donna clegg's-- she had trouble with words, her right side was weak. her husband greg took her back to duke for an emergency m.r.i. this was nancy's tumor before the polio infusion; three months later, the site had doubled in size. the swelling had pushed one hemisphere of her brain into the other. >> avastin, 500 milligrams. >> pelley: dr. desjardins ordered a small dose of a cancer drug called avastin-- not to treat the tumor, but to reduce the swelling. nancy's symptoms improved right away, and tw

dr. annick desjardins showed her how it went. >> desjardins: so we can exactly see where the polio viruse m.r.i. you and i looked at on monday. then, you see here the brighter area there? can you see that? >> nancy justice: yes. >> desjardins: that's the polio virus. >> nancy justice: wow. >> desjardins: exactly where we needed it. >> nancy justice: oh. cool. okay. >> desjardins: right where it should be. >> pelley: in a few months they'll take another m.r.i. to see which is stronger, glioblastoma or polio. >> henry friedman: the number of calls are increasing. >> pelley: this is duke's polio team. as usual in such studies several of them have a financial stake, so they'll benefit too if it becomes commercial. can you pick out the deputy director of the brain tumor center? well, when you're one of the world's leading cancer doctors turns out you can wear what you like. and after 34 years, folks at duke are used to how dr. henry friedman's brain views fashion. >> friedman: it's really good to see that things are going well. >> pelley: it was friedman who encouraged nancy justice to gamble