A study in the Journal of Clinical Oncology found anal cancer rates in the U.S. grew from about one case per 100,000 people between 1973 and 1996 to three cases per 100,000 during the period between 1997 and 2009. Researchers said squamous cell carcinoma was the most common form, affecting 85% of patients. Researchers said better screening among high-risk groups may explain the increase.

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