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What's next in fighting cancer with polio virus?

The FDA granted a new brain cancer treatment that uses the polio virus with "breakthrough status." This means clinical trials can move more quickly than usual. Scott Pelley and "60 Minutes" have been following the trials at Duke University for two years, tracking several of the study's participants. Dr. David Agus joins "CBS This Morning" from Los Angeles to discuss what's next for the cancer breakthrough.
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