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      Detección y tipificación de virus papiloma humano en lesiones preneoplásicas del cuello uterino mediante PCR-RFLP Translated title: Detection and typification of human papilloma virus in pre cancerous cervical lesions

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          Background: The association of different genotypes of human papilloma virus (HPV) with cervical cancer is well known. However, there is little information about their association with pre-cancerous lesions. Aim: To assess the frequency of different HPV genotypes in pre cancerous cervical lesions. Material and methods: A cervical sample was obtained by cytobrush in 15 women with low grade lesions and 40 women with high grade lesions, subjected to conization by loop electrical excision procedure (LEEP). Detection and typification of HPV was done by polymerase chain reaction and restriction fragment length polymorphism. Results: All women were infected with HPV. Eighty five percent of samples were typified. A unique HPV subtype was found in 76% of women. Fourteen percent had an infection with multiple subtypes and in 10%, the viral genotype was not identified. The most common subtypes found were HPV 16, HPV 52 and HPV 53. Conclusions: There is a high rate of infection with HPV with a high oncogenic risk among these women

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          Most cited references56

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          Population-based prevalence and age distribution of human papillomavirus among women in Santiago, Chile.

          More than 18 types of human papillomavirus (HPV) are associated with cervical cancer, the relative importance of the HPV types may vary in different populations. To investigate the types of HPV, age distribution, and risk factors for HPV infection in women from Santiago, Chile. We interviewed and obtained two cervical specimens from a population-based random sample of 1,038 sexually active women (age range, 15-69 years). Specimens were tested for the presence of HPV DNA using a GP5+/6+ primer-mediated PCR and for cervical cytologic abnormalities by Papanicolaou smears. 122 women tested positive for HPV DNA, 87 with high risk types (HR), and 35 with low risks (LR) only. Standardized prevalence of HPV DNA was 14.0% [95% confidence interval (95% CI), 11.5-16.4]. HR HPV by age showed a J reverse curve, whereas LR HPV showed a U curve, both statistically significant in comparison with no effect or with a linear effect. We found 34 HPV types (13 HR and 21 LR); HPV 16, 56, 31, 58, 59, 18, and 52 accounted for 75.4% of HR infections. Thirty-four (3.6%) women had cytologic lesions. Main risk factor for HPV and for cytologic abnormalities was number of lifetime sexual partners, odds ratios for > or =3 versus 1 were 2.8 (95% CI, 1.6-5.0) and 3.8 (95% CI, 1.3-11.4), respectively. LR HPV presented a clear bimodal age pattern; HR HPV presented a J reverse curve. HPV prevalence was similar to that described in most Latin American countries.
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            Comparison of five different polymerase chain reaction methods for detection of human papillomavirus in cervical cell specimens.

            The polymerase chain reaction (PCR) methods enable the detection of large number of human papillomavirus (HPV) genotypes that infect the anogenital tract. In this study, two groups of cervical scrapes with abnormal cytomorphology were analysed. The first group was tested with three sets of consensus primers located within the L1 region of HPV genome, MY09/MY11 (i.e. MY), L1C1/L1C2-1/L1C2-2 (i.e. LC) and pI-1/pI-2 (i.e. pI) primer sets, while the second group of samples, which were all negative with the MY primers, was tested further with the LC primers, as well as with the GP5/GP6 (i.e. GP) primers. The GP primers were used in the nested PCR following amplification with the MY primers (i.e. MY/GP nested PCR). Samples from both groups were also tested with type-specific primers for HPV types 6/11, 16, 18, 31 and 33. In the first study group (N=164) there were 76.2% positive results obtained with at least one set of consensus primers. There were 62.2, 39, 62.2 and 59.1% positive results obtained with the MY, the pI, the LC and the HPV type-specific primer sets, respectively. The best results were obtained when both the MY and the LC primer sets were used, because in combination they detected 75% positive samples compared to 62.2% when used alone. There were 2. 4% samples negative with all consensus primers, but positive with one of the HPV type-specific primers, which increased the overall positivity rate to 78.6%. In the second study group (N=250) there were 8.4, 38.8 and 4% samples positive with the LC primers, the nested MY/GP and the HPV type-specific primer sets, respectively. Thus, the use of the MY/GP nested PCR increased significantly the positivity rate of HPV DNA detection and should be used for samples with a low copy number of HPV DNA. In conclusion, the following diagnostic protocol would be appropriate for detection of cancer-related HPVs: preselection of samples with the MY and the LC primers, additional amplification of the MY- and the LC-negative samples with the MY/GP nested PCR and HPV typing of consensus PCR-positive samples with the HPV type-specific primers.
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              Human papillomaviruses and cervical cancer.

              L Villa (1996)
              Molecular and epidemiological studies conducted over the last 20 years led to the recognition of certain types of human papillomavirus (HPV) as the etiological agents of cervical cancer, a very common neoplasia, particularly in developing countries. More than 70 HPVs have been described, including both cutaneous and mucosal types. About half of the known HPVs, and an even higher number of variants, have been isolated from genital mucosas. The association of certain types primarily with normal tissues and benign lesions, as opposed to cancer-associated types, has led to the concept of low and high oncogenic risk HPVs, respectively. The latter express oncogenic proteins that interfere with cell growth control functions. As a consequence of the continuous expression of these viral genomes, chromosome instability may occur, leading to fully transformed cells. Studies indicate that persistence of high-risk HPVs may determine progression to more severe stages of cervical disease, while the majority of HPV infections are transient and do not seem to be important in cervical carcinogenesis. The risk for disease progression seems also to be associated with viral burden. Prospective epidemiological studies will contribute to the knowledge of the natural history of HPV infections and provide information on the determinants of viral persistence. Data derived from these studies may define the clinical utility of HPV testing and its use in cervical cancer prevention programs.
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                Author and article information

                Journal
                rmc
                Revista médica de Chile
                Rev. méd. Chile
                Sociedad Médica de Santiago (Santiago, , Chile )
                0034-9887
                February 2007
                : 135
                : 2
                : 167-173
                Affiliations
                [01] Temuco orgnameUniversidad de La Frontera orgdiv1Facultad de Medicina orgdiv2Departamento de Anatomía Patológica Chile
                [02] Temuco orgnameUniversidad de La Frontera orgdiv1Facultad de Medicina orgdiv2Departamento de Obstetricia y Ginecología Chile
                Article
                S0034-98872007000200004 S0034-9887(07)13500204
                10.4067/S0034-98872007000200004
                97e0045a-b6f8-4674-9df5-b2b97a20a918

                This work is licensed under a Creative Commons Attribution 4.0 International License.

                History
                : 16 August 2006
                : 07 March 2006
                Page count
                Figures: 0, Tables: 0, Equations: 0, References: 41, Pages: 7
                Product

                SciELO Chile

                Categories
                ARTICULOS DE INVESTIGACION

                Uterine cervical cancer,Human papilloma virus,Oncogenes

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