Stealthy gene network makes brain tumors flourish

CHICAGO -- The brain tumor afflicting Sen. Edward Kennedy -- a glioblastoma -- is the most aggressive and wily form of brain cancer. It has foiled researchers' decades-long efforts to thwart its explosive growth in the brain. The lethal tumor ? the most common brain tumor in humans -- nimbly alters its genes like a quick-change artist to elude treatments to destroy it.

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