Publication: Human papillomaviruses and cervical cancer in Bangkok. II. Risk factors for in situ and invasive squamous cell cervical carcinomas
Issued Date
2001-04-15
Resource Type
ISSN
00029262
Other identifier(s)
2-s2.0-0035871365
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Mahidol University
Rights Holder(s)
SCOPUS
Bibliographic Citation
American Journal of Epidemiology. Vol.153, No.8 (2001), 732-739
Suggested Citation
David B. Thomas, Qin Qin, Jane Kuypers, Nancy Kiviat, Rhoda L. Ashley, Amorn Koetsawang, Roberta M. Ray, Suporn Koetsawang Human papillomaviruses and cervical cancer in Bangkok. II. Risk factors for in situ and invasive squamous cell cervical carcinomas. American Journal of Epidemiology. Vol.153, No.8 (2001), 732-739. doi:10.1093/aje/153.8.732 Retrieved from: https://repository.li.mahidol.ac.th/handle/123456789/26803
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Title
Human papillomaviruses and cervical cancer in Bangkok. II. Risk factors for in situ and invasive squamous cell cervical carcinomas
Abstract
To identify risk factors for progression of intraepithelial cervical lesions, 190 women with invasive cervical cancer were compared with 75 women with in situ disease diagnosed in Bangkok, Thailand, between September 1991 and September 1993. Polymerase chain reaction-based assays for type-specific human papillomavirus (HPV) DNA in cervical scrapings revealed oncogenic types in 79% of invasive and 57% of intraepithelial tumors. Types 16 and 18, but not types 31/33/35/39, were more common in invasive than intraepithelial tumors, and untyped HPV DNA was found more commonly in the in situ lesions, suggesting that in situ disease is four times more likely to become invasive if due to type 16 or 18 than to other causes, and that tumors with only untyped HPV are not at increased risk of progression. After controlling for HPV type, the risk of developing invasive diseases, compared with the risk of developing intraepithelial lesions, was not related to any of a large number of sexual and hormonal factors considered or to smoking, suggesting that any cofactors these variables represent act before the development of in situ carcinoma. Two indices of socioeconomic status were associated with a reduced risk of only invasive disease, suggesting the existence of unknown protective factors that operate after intraepithelial lesions develop.