By Robert S. Boyd WASHINGTON - 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.

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.