Anal cancer prevention in HIV-positive men and women
- PMID: 19587592
- PMCID: PMC3415247
- DOI: 10.1097/CCO.0b013e32832f511a
Anal cancer prevention in HIV-positive men and women
Abstract
Purpose of review: The incidence of human papillomavirus-associated anal cancer is unacceptably high among HIV-positive men who have sex with men, and possibly in HIV-positive women. Unlike most other malignancies occurring in the HIV-positive population, anal cancer is potentially preventable, using methods similar to those used to prevent cervical cancer in women. This review discusses the issues around screening to prevent anal cancer.
Recent findings: Recent studies show that the incidence of anal cancer has increased since the introduction of highly active antiretroviral therapy in this population and now exceeds the highest incidence of cervical cancer among women reported anywhere in the world.
Summary: The high incidence of anal cancer among HIV-positive individuals must not be ignored, since it may be preventable. Given the current evidence and analogy with the cervical cancer prevention model, many clinicians believe that identification and treatment of high-grade anal intraepithelial neoplasia to prevent anal cancer are warranted. When the expertise to do so exists, this is a reasonable approach, particularly if coupled with efforts to optimize further screening and treatment approaches, as well as efforts to document the efficacy of high-grade anal intraepithelial neoplasia treatment to reduce the incidence of anal cancer.
Conflict of interest statement
Conflict of interest: Dr. Palefsky receives grant support from Merck and Co.
References
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- Hoots BE, Palefsky JM, Pimenta JM, Smith JS. Human papillomavirus type distribution in anal cancer and anal intraepithelial lesions. Int J Cancer. 2009 May 15;124(10):2375–83. This is a meta-analysis examining the prevalence of HPV in 992 invasive anal cancers, 472 HSIL cases and 360 LSIL cases. The prevalence of HPV in prevalence in anal cancer, HSIL, and LSIL was 71, 91 and 88%, respectively. The prevlence of HPV 16 or 18 specifically was 72% in invasive anal cancer, 69% in HSIL and 27% in LSIL. - PubMed
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- Watson AJ, Smith BB, Whitehead MR, Sykes PH, Frizelle FA. Malignant progression of anal intra-epithelial neoplasia. ANZ journal of surgery. 2006 Aug;76(8):715–7. - PubMed
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- Berry JM, Palefsky JM, Jay N, Cheng SC, Darragh TM, Chin-Hong PV. Performance characteristics of anal cytology and human papillomavirus testing in patients with high-resolution anoscopy-guided biopsy of high-grade anal intraepithelial neoplasia. Dis Colon Rectum. 2009 Feb;52(2):239–47. This study examined the sensitivity of abnormal anal cytology to detect high-grade anal neoplasia. In HIV-positive men the sensitivity was 87 percent, and in HIV-negative MSM it was 55 percent. - PubMed
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- Chin-Hong PV, Berry JM, Cheng SC, Catania JA, Da Costa M, Darragh D, et al. A population-based study of human papillomavirus-associated anal neoplasia in HIV-positive and HIV-negative men using self-collected specimens: the TPOP study. Annals Int Med. 2008;149(5):300–6. This study was a population-based study of HIV-positive and HIV-negative MSM in San Francisco. High-grade AIN was diagnosed in 43% of HIV-positive MSM and 25% of HIV-negative MSM. Oncogenic anal HPV infection was found in 72% of HIV-positive MSM and 34% of HIV-negative MSM. Self-sampling for anal cytology was non-inferior to clinician-collected samples to detect AIN. - PubMed
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- Saiag P, Bauhofer A, Bouscarat F, Aquilina C, Ortonne JP, Dupin N, et al. Imiquimod 5% cream for external genital or perianal warts in human immunodeficiency virus-positive patients treated with highly active antiretroviral therapy: an open-label, noncomparative study. The British Journal of Dermatology. 2009 May 15; e-pub. Warts were treated with imiqimod in 50 HIV-positive patients, with 32% clearance at week 16. - PubMed
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