NEW YORK, Mar 23: The number of people in the US with anal cancer has tripled since the 1970s, according to a new study that suggests rates of detection in high-risk groups may partly explain the rise in cases. A US cancer database search found that the rate of anal cancers went from approximately one person per 100,000 between 1973 and 1996 to three people per 100,000 between 1997 and 2009. (agencies)
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