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    Virus Linked to Throat Cancer Trend

    Oral Sex Considered a Risk Factor
    By
    WebMD Health News
    Reviewed by Louise Chang, MD

    Aug. 27, 2007 -- Unlike most head and neck cancers, throat cancer rates in the United States have not dropped in recent years, and infection with the sexually transmitted infection human papilloma virus (HPV) may be the cause.

    HPV is a virus that causes genital warts and most cervical cancers, but its transmission through oral sex has only recently been identified as a potential cause of throat cancer.

    In a newly published analysis of head and neck cancer rates in the U.S., researchers from Houston’s M.D. Anderson Cancer Center found the incidence of throat cancer to be stagnant and even rising in some populations, defying a downward trend in other head and neck cancers linked more closely with smoking.

    The findings underscore the importance of research aimed at determining if the newly available HPV vaccine is effective in males, researcher Erich Sturgis, MD, MPH, tells WebMD.

    “The vaccine has been shown to be almost 100% effective for preventing cervical infection,” he says. “We would encourage the medical community and [vaccine] industry to study its role in preventing this oral cancer.”

    Throat Cancer Risk Factors

    Tobacco use and drinking alcohol are by far the biggest risk factors for head and neck cancers. About 90% of patients with these malignancies either smoke or chew tobacco, or have done so in the past, and up to 80% of oral cancer patients also drink a lot of alcohol, according to the American Cancer Society.

    In their newly published analysis of head and neck cancer trends in the U.S., Sturgis and co-author Paul M. Cinciripini, MD, showed that the decline in smoking has led to a decline in most head and neck cancers over the past two decades.

    “These decreasing incidence rates trail by 10 to 15 years the declines in smoking prevalence, which began in the 1970s,” they wrote in the Oct. 1 issue of the journal Cancer.

    The main exception to this trend has been throat cancer, more specifically defined as cancer of the oropharynx, which includes the tonsils, base of the tongue and soft palate, and side and back of the throat.

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