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Human papillomavirus genotype distribution in New Mexico cervical cancers
Date:3/24/2009

DNA from human papilloma virus type 16 (HPV16) and HPV type 18 (HPV18) were found in the majority of invasive cervical cancers in New Mexico in the 1980s and 1990s, according to a population-based study published in the March 24 online issue of the Journal of the National Cancer Institute.

The mean age of women diagnosed with HPV16- or HPV18-positive cancer was 5 years younger than that of women diagnosed with cancers associated with other HPV types, which may have implications for cancer screening in the future.

Large population-based studies that examine HPV genotype distribution in the United States have been lacking. Such studies are necessary to assess the impact of HPV vaccines that aim to reduce the incidence of cervical cancer due to HPV16 and HPV18.

In the current study, Cosette M. Wheeler, Ph.D., of the University of New Mexico Health Sciences Center in Albuquerque, and colleagues used the Surveillance, Epidemiology, and End Results registry to identify 1,213 cases of in situ cervical cancer diagnosed between 1985 and 1999 and 808 cases of invasive cervical cancer diagnosed between 1980 and 1999 in New Mexico. The investigators used DNA-based testing to identify the HPV genotype that was present in tumor samples. In addition, they tested 4,007 cervical Pap test specimens from women who did not have cancer for the presence of HPV DNA.

HPV16 DNA was found in 53.2 percent of invasive cervical cancers, while HPV18 DNA was found in 13.1 percent, and HPV45 DNA in 6.1 percent. In the in situ cervical cancer samples, HPV16 DNA was detected in 56.3 percent of cases, HPV31 DNA in 12.6 percent, and HPV33 DNA in 8.0 percent. The median age at diagnosis of invasive cancer positive for HPV16 and HPV18 was 48.1 and 45.9 years, respectively. By contrast, the median age at diagnosis of invasive cancer positive for other HPV genotypes was 52.3 years.

"To our knowledge, this is the largest study of this kind conducte
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Contact: Caroline McNeil
jncimedia@oxfordjournals.org
301-841-1287
Journal of the National Cancer Institute
Source:Eurekalert

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