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Study Supports HPV Vaccination Guidelines

👤by Randy Dotinga 0 comments 🕔Wednesday, April 22nd, 2015

TUESDAY, April 21, 2015 (HealthDay News) -- New research finds that young women who get the HPV vaccine gain significant protection against infection in three parts of the body if they haven't already been exposed to the human papillomavirus.

"HPV is a local infection that can separately infect the cervical, anal, or oral sites, where it can occasionally lead to cancer," said Daniel Beachler, a postdoctoral fellow at the U.S. National Cancer Institute. "This study demonstrates that the HPV 16/18 vaccine provides protection at all three sites, particularly among women without evidence of HPV exposure prior to vaccination."

Beachler also said that even those previously exposed to the virus may gain a benefit. "While the HPV vaccine is not therapeutic and cannot help clear current infections, we did observe that it may help protect some women previously exposed to HPV against subsequent infection at their non-infected sites," he said in a news release from the American Association for Cancer Research (AACR).

The study is scheduled for presentation Tuesday at the annual meeting of the AACR in Philadelphia. Research presented at conferences is usually considered preliminary until published in a peer-reviewed medical journal.

The study involved more than 4,100 women in Costa Rica, aged 18 to 25. Half were assigned to get the HPV vaccine while the others received an inactive placebo.

The researchers found that the vaccine was 83 percent effective in all three body sites among women without apparent HPV exposure, and 58 percent effective among women who had been exposed to the virus.

However, Beachler pointed out that the analysis was a one-time sampling of oral and anal HPV infection four years after vaccination. "Further research and better understanding of HPV infection outside of the cervix is needed," he said.

Three HPV vaccines are now available, Beachler said. These vaccines -- Cervarix, Gardasil and Gardasil 9 -- should be given as a series of three shots over six months, according to the U.S. Centers for Disease Control and Prevention.

U.S. guidelines recommend that girls aged 11 to 12 get the HPV vaccine to help prevent cervical cancer. For someone who hasn't been vaccinated, guidelines recommend vaccination through the age of 26.

Gardasil and Gardasil 9 also protect against genital warts and anal cancer in both females and males, according to the CDC.

Despite these guidelines, only half of females under age 18 have been vaccinated in the United States, the study authors said in the news release.

-- Randy Dotinga

Article Credits / Source

Randy Dotinga / HealthDay

Randy Dotinga wrote this story for HealthDay. HealthDay provides up to the minute breaking health news. Click here to view this full article from HealthDay.

SOURCES: American Association for Cancer Research, news release, April 21, 2015

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