Linked Life Data

12814990

Source:http://linkedlifedata.com/resource/pubmed/id/12814990

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pubmed-article:12814990pubmed:abstractTextStudies investigating human papillomavirus (HPV) viral load as a risk factor in the development of squamous intraepithelial lesions (SILs) and cancer have often yielded conflicting results. These studies used a variety of HPV viral quantitation assays [including the commercially available hybrid capture 2 (HC 2) assay], which differ in their ability to account for differences in cervical cell collection, linear dynamic range of viral load quantitation, and determination of type-specific versus cumulative viral load measures. HPV-16 and HPV-18 viral quantitation using real-time PCR assays were performed to determine whether type-specific viral load measurements that adjust for specimen cellularity result in a different association between viral load and prevalent SIL and cancer, compared with HC 2 quantitation (which does not adjust for cellularity or multiple infections). In general, HPV-16 viral load as measured by real-time PCR increased linearly with increasing grade of SIL while HPV-18 measured using similar techniques increased through low-grade SIL (LSIL), with HPV-18 viral load among high-grade SIL and cancers near the level of cytologically normal women. HC 2 viral load, using the clinical 1.0 pg/ml cut point, differentiated cytologically normal women from women with any level of cytological abnormality (normal versus >/=LSIL) but did not change as lesion severity increased. There was no evidence for plateau of HC 2 at high copy numbers, nor was significant variability in total specimen cellularity observed. However, cumulative viral load measurements by HC 2, in the presence of multiple coinfections, overestimated type-specific viral load. Multiple infections were more common among women with no (32%) or LSIL (51%) [versus 23% in high-grade SIL/cancer], partially explaining the lack of a dose response using a cumulative HC2 viral load measure. The nonrandom distribution of multiple infections by case-control status and the apparent differential effect of viral load by genotype warrant caution when using HC 2 measurements to infer viral load associations with SIL and cancer.lld:pubmed
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pubmed-article:12814990pubmed:articleTitleA comparison between real-time polymerase chain reaction and hybrid capture 2 for human papillomavirus DNA quantitation.lld:pubmed
pubmed-article:12814990pubmed:affiliationDivision of Cancer Epidemiology and Genetics, National Cancer Institute, Bethesda, Maryland 20892, USA. pgravitt@jhsph.edulld:pubmed
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