HPV vaccine shown effective at reducing cancer-causing infections

A vaccine that could reduce cervical cancer rates by 75 percent is safe and 95 percent effective, according to a study of 1,113 women in North America and Brazil.

The vaccine against the most common cancer-causing strains of human papillomavirus was 100 percent effective at preventing the persistent infections that cause cervical cancer, researchers report in the Nov. 13 issue of the British journal, The Lancet.

"This study provides objective evidence that this vaccine will work, it's going to save lives and will have a major impact on women's health care," says Dr. Daron G. Ferris, a study co-author who directs the Gynecologic Cancer Prevention Center at the Medical College of Georgia in Augusta.

"This is a tremendous advancement for women in particular, although it's likely the vaccine will one day be given to men as well," Dr. Ferris says of the bivalent vaccine that protects against types 16 and 18, which also cause penile cancer.

MCG was the largest study site in North America, with 83 women age 15 to 25 in the study taking three doses of vaccine over six months, then being followed for up to 27 months.

When the vaccine was taken correctly, it was 91.6 percent effective at reducing incident or new infections, the study showed. Researchers noted the vaccine prompted the body to produce high numbers of antibodies to fight the HPV infection and the only side effects were some redness and irritation at the vaccine site.

"The efficacy of the bivalent vaccine against HPV 18 infection is particularly important," Drs. Matti Lehtinen and Jorma Paavonen of the National Public Health Institute in Finland note in a companion editorial. Pap smears, used to detect cervical cancer or precancerous changes of the cervix, are not as good at detecting adenocarcinoma, the type of cervical cancer most associated with HPV 18. "Adenocarcinoma is difficult to find even when we know it's there," Dr. Ferris says of tests and biops

Contact: Toni Baker
Medical College of Georgia

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