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Infection site and patient ethnicity affect HPV-induced cancer pathways.
2004 NOV 4 - (NewsRx.com & NewsRx.net) -- The site of infection and ethnicity of the patient influence the biological pathways to HPV-induced mucosal cancer.
According to published research from Australia, "High-risk human papillomaviruses are the causative agents of cervical cancer and are also believed to be etiologically involved in a subset of squamous cell carcinomas of the head and neck region, especially the tonsil. Cervical cancers arise through disruption of the pathways of p53 and the product of the retinoblastoma gene by the human papillomavirus oncoproteins E6 and E7. It is generally assumed that the same pathways are involved in human papillomavirus-induced carcinogenesis at other mucosal surfaces."
"However, the patterns of expression of cell cycle proteins targeted by human papillomavirus E6 and E7 in cancers from different anatomic sites have been inconsistent, due to either biologic or technological factors," said Wei Li at the Sydney Head and Neck Cancer Institute and collaborators in Australia. "In this study, 73 human papillomavirus 16-positive cervical squamous cell carcinomas (35 from Australian and 38 from Chinese women) were analyzed for the expression of p53, pRb, p16(INK4A), p21(CIP1/WAF1), p27(KIP1), and cyclin D1 by semiquantitative immunohistochemistry. Cervical cancers from Chinese women were found to be significantly more likely to overexpress p53, pRb, p21, and p27 than their Australian counterparts."
"These findings were compared with those from 31 human papillomavirus 16-positive tonsillar squamous cell ...
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Source: HighBeam Research, Infection site and patient ethnicity affect HPV-induced cancer...