June 23, 2008 3:48 PM

In cancer war, viruses can be good guys

Viruses aren't always the bad guys. Sure, they can cause colds, measles, AIDS and other miseries. But with some tinkering, these tiny organisms may become a new and better way to treat cancer. In the last few years, scientists have been genetically engineering various viruses so they attack cancer cells but leave healthy cells alone.

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