© 2001 by Oxford University Press
Journal of the National Cancer Institute, Vol. 93, No. 11, 843-849,
June 6, 2001
© 2001 Oxford University Press
Prevalence and Risk Factors for Anal Squamous Intraepithelial Lesions in Women
Affiliations of authors: E. A. Holly, M. L. Ralston (Department of Epidemiology and Biostatistics), T. M. Darragh (Department of Pathology), R. M. Greenblatt (Departments of Epidemiology and Biostatistics and Department of Medicine), N. Jay (Department of Stomatology), J. M. Palefsky (Departments of Stomatology and Laboratory Medicine), University of California, San Francisco.
Correspondence to: Elizabeth A. Holly, Ph.D., M.P.H., Department of Epidemiology and Biostatistics, University of California, San Francisco, 3333 California St., Suite 280, Box 1228, San Francisco, CA 94143–1228 (e-mail: eaholly{at}epi.ucsf.edu).
Background: Anal cancers are thought to arise from squamous intraepithelial lesions in the anal canal, and women infected with human immunodeficiency virus-1 (HIV) may be at higher risk of anal cancer. Our aim was to determine the prevalence of human papillomavirus (HPV)-related abnormalities of the anal canal in women and to characterize risk factors for these lesions. Methods: We evaluated HPV-related abnormalities in 251 HIV-positive and in 68 HIV-negative women. We completed physical examinations and obtained questionnaire data on medical history and relevant sexual practices. Univariate and adjusted relative risks (RRs) and 95% confidence intervals (CIs) were computed using the Mantel–Haenszel procedure and regression techniques. All statistical tests were two-sided. Results: Abnormal anal cytology, including atypical squamous cells of undetermined significance, low-grade squamous intraepithelial lesions, or high-grade squamous intraepithelial lesions (HSILs), was diagnosed in 26% of HIV-positive and in 8% of HIV-negative women. HSILs were detected by histology or cytology in 6% of HIV-positive and in 2% of HIV-negative women. HIV-positive women showed increased risk of anal disease as the CD4 count decreased (P<.0001) and as the plasma HIV RNA viral load increased (P = .02). HIV-positive women with abnormal cervical cytology had an increased risk of abnormal anal cytology at the same visit (RR = 2.2; 95% CI = 1.4 to 3.3). Abnormal anal cytology in HIV-positive women was associated with anal HPV RNA detected by the polymerase chain reaction and by a nonamplification-based test (RR = 4.3; 95% CI = 1.6 to 11). In a multivariate analysis, the history of anal intercourse and concurrent abnormal cervical cytology also were statistically significantly (P = .05) associated with abnormal anal cytology. Conclusions: HIV-positive women had a higher risk of abnormal anal cytology than did HIV-negative women with high-risk lifestyle factors. These data provide strong support for anoscopic and histologic assessment and careful follow-up of women with abnormal anal lesions.
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