Medicine: Progress on Cancer

Most researchers have long believed that viruses play some crucial role in causing human cancers. The source and precise function of these viruses (tiny packets of nucleic acids and protein) in cancer are still obscure, and no one knows how to control them. Dramatic progress cannot be made until cancer viruses are clearly identified in humans, as has already been done in animals. Now that vital next step has apparently been taken.

Because false grails have been hailed in the past, the U.S. scientists reporting the new development this week used guarded language. Further...

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