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News brief: Benefit of HPV Vaccination, Frequent Screening for Women over 41 is Likely to be Low
Date:2/15/2010

The overall potential benefits of human papillomavirus (HPV) vaccinations or frequent HPV screenings for women over the age of 41 are low, concludes a new study published online February 15 in the Journal of the National Cancer Institute. The study found that the rate of new infections preventable by vaccination declines with age. Furthermore, new infections among women at any age typically do not progress to cervical intraepithelial neoplasia grade 2 (CIN 2) or CIN 3, the precursors for cervical cancer.

This study was undertaken because researchers wanted to examine whether women's age and the duration of carcinogenic HPV infections influenced subsequent persistence of infection and risk of CIN 2 or worse disease.

Ana Cecilia Rodrguez, M.D., of the Proyecto Epidemiolgico Guanacaste, Fundacin INCIENSA, in San Jos, Costa Rica, and colleagues screened over 9,000 women in Costa Rica aged 18 to 97 years. Those with CIN 2 or worse disease at enrollment were treated and not followed further. Among the remaining participants, those at low risk of CIN 2 or worse were rescreened at 5-7 years (passively followed), whereas higher-risk participants and subsets of low-risk women and initially sexually non-active women were rescreened annually or semiannually (actively followed) for up to 7 years.

Most of the CIN 2 or worse disease diagnosed during the study period was associated with persistent carcinogenic HPV infections that were prevalent, or already present at the time of initial testing.

The vast majority of newly detected carcinogenic HPV infections did not persist and did not lead to CIN 2 or worse disease during the study period, regardless of age. The rate of newly detected carcinogenic HPV infections declined with increasing age and ranged from 35 percent in women aged 18-25 years to 13.5 percent in women aged 42 years and older.

"Understanding the relevance of the concept of duration of infection can imp
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Contact: Steve Graff
jncimedia@oxfordjournals.org
301-841-1285
Journal of the National Cancer Institute
Source:Eurekalert

Page: 1 2

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