In the United States, oral cancer due to HPV infection is
now more common than oral cancer from tobacco use, which remains the leading
cause of such cancers in the rest of the world.
Researchers have found a 225-percent increase in oral cancer cases in the
United States from 1974 to 2007, mainly among white men, said Maura Gillison
of Ohio State University.
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"When you compare people who have an oral infection or not... the single
greatest factor is the number of partners on whom the person has performed
oral sex," said Gillison, who has been researching HPV and cancer for 15
"When the number of partners increases, the risk increases," she told
reporters at the American Association for the Advancement of Science meeting