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Elements of an anal dysplasia screening program
1University of California San Francisco Anal Dysplasia Clinic and HPV Research Trials, San Francisco, USA.
Abstract:
The incidence of anal cancer in HIV-infected men who have sex with men (MSM) is highly elevated compared to the general population, as is the incidence of its precursor lesion, high-grade anal intraepithelial neoplasia (HGAIN). MSM in general and other immunocompromised populations are also at higher risk. Treatment of HGAIN may prevent development of cancer, similar to the decrease in cervical cancers that has occurred since the advent of cervical cancer screening programs in women. Cervical cancer screening tools have been adapted and validated for screening, diagnosis, and treatment of anal HGAIN. Anal cancer screening programs have now been available for more than a decade, although they are not yet standards of care. Incorporating screening procedures into practice depends on the available resources in a particular community. This article discusses the procedures for anal cancer screening including cytology, digital anal rectal examinations, high-resolution anoscopy, and biopsy.
Insights
Anal cancer screening can prevent cancer development in high-risk groups, particularly HIV-infected men who have sex with men (MSM). Early detection of high-grade anal intraepithelial neoplasia (HGAIN) through adapted cervical cancer screening tools is crucial.
Area of Science:
- Oncology
- Infectious Diseases
- Public Health
Background:
- HIV-infected men who have sex with men (MSM) have a significantly higher incidence of anal cancer and its precursor, high-grade anal intraepithelial neoplasia (HGAIN).
- Other immunocompromised populations also face increased risk for these conditions.
- Anal cancer screening programs, though not yet standard care, offer a potential avenue for prevention.
Purpose of the Study:
- To discuss procedures for anal cancer screening.
- To highlight the importance of early detection and treatment of HGAIN to prevent anal cancer.
- To inform about the adaptation of cervical cancer screening tools for anal conditions.
Main Methods:
- Review of established and adapted screening tools for anal HGAIN.
- Discussion of procedures including cytology, digital anal rectal examinations, high-resolution anoscopy, and biopsy.
- Consideration of resource availability for implementing screening programs.
Main Results:
- Cervical cancer screening tools have been successfully adapted and validated for anal HGAIN screening, diagnosis, and treatment.
- Anal cancer screening programs have existed for over a decade, demonstrating feasibility.
- Implementation success depends on community resources.
Conclusions:
- Anal cancer screening holds promise for preventing cancer in high-risk populations, mirroring successes in cervical cancer prevention.
- Integration of screening procedures requires careful consideration of local resources.
- Further adoption of anal cancer screening programs is recommended.
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