Cancer, always believed to be caused by genetic cell mutations—can in reality be caused by infections from viruses, bacteria, and fungi. “I believe that, conservatively, 15 to 20% of all cancer is caused by infections; however, the number could be larger—maybe double,” said Dr. Andrew Dannenberg, director of the Cancer Center at New York-Presbyterian Hospital/Weill Cornell Medical Center. Dr. Dannenberg made the remarks in a speech in December 2007 at the annual international conference of the American Association for Cancer Research.
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