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A new study has determined a link between vaccines for preventing cervical cancer and the prevention of anal cancer.
The study, published in the journal The Lancet Oncology, tested 4,210 healthy Costa Rican women between the ages of 18-25. Some were given Cervarix, a drug that fights human papillomavirus (HPV), while others were just given the hepatitis A vaccine. HPV -- especially strains 16 and 18 -- is associated with four of five instances of anal cancer.
Four years after these women were administered the vaccines, they were tested for HPV infections. The Cervarix group had a 76% lower rate of cervical infection and a 62% lower rate of anal infection than the control group. Among women with a previously-determined low chance of infection, the figures were 89% and 84% effective against cervical and anal infection, respectively.
Anal cancer is rare and only affects 2 out of 100,000 people per annum. In 2010, 3260 female anal cancers were recorded, compared with 2000 male. Gay males are 20 times more likely than the general population to develop the cancer and HIV-positive gay males are twice as likely as that.
Researchers now hope to continue to monitor the effects of Cervarix over the course of a decade and a half.
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