High grade cervical lesions are caused preferentially by non-European variants of HPVs 16 and 18.
Int J Cancer
; 120(8): 1763-8, 2007 Apr 15.
Article
em En
| MEDLINE
| ID: mdl-17230525
ABSTRACT
The intratypic variability of HPVs 16 and 18 has been extensively studied and has been used as an important tool in epidemiological studies of viral transmission, persistence and progression to clinically relevant cervical lesions. Infections by non-European variants of HPVs 16 and 18 are associated with an increased risk for the development of high grade squamous intraepithelial lesions (HSIL). Our aim was to correlate the intratypic molecular variability of both HPV types and risk of persistent infection and lesion outcome in a cohort study conducted in Brazil. We characterized molecular variants of HPV types 16 and 18 by sequencing a fragment of the LCR, and of the E6 and L1 genes, for HPV-16 variants only. For both types, European variants composed the most prevalent and diverse group. Persistent infections with HPV-18 were associated with continuous detection of European variants. However, risk for simultaneous detection of HSIL and HPV DNA was higher in women harboring non-European variants of HPV-16. The same trend was observed with HSIL detected during follow-up. Our study confirms the association between non-European variants and risk of cervical neoplasia, and highlights the importance of their geographic distribution for cervical cancer risk assessment.
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Base de dados:
MEDLINE
Assunto principal:
Variação Genética
/
Displasia do Colo do Útero
/
Neoplasias do Colo do Útero
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Papillomavirus Humano 16
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Papillomavirus Humano 18
Tipo de estudo:
Etiology_studies
/
Incidence_studies
/
Observational_studies
/
Prognostic_studies
/
Risk_factors_studies
/
Screening_studies
Limite:
Adolescent
/
Adult
/
Female
/
Humans
/
Middle aged
País como assunto:
America do sul
/
Brasil
Idioma:
En
Ano de publicação:
2007
Tipo de documento:
Article