Doctors using the polio virus to treat aggressive brain tumors called glioblastomas report promising results. Sen. John McCain has this type of cancer, and so did Sen. Ted Kennedy. Of 61 patients treated in one study, 21 percent were still alive at the three-year mark. That's compared with just four percent of patients who received standard cancer treatment. Dr. David Agus, director of USC Norris Westside Cancer Center, joins "CBS This Morning" to discuss the treatment. He also weighs in on a study that showed flight attendants had a higher cancer prevalence than the general population.
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