Anal squamous intraepithelial lesions: an update and proposed management algorithm.

Area of Science:

• Oncology
• Virology
• Dermatology

Background:

• Anal squamous intraepithelial lesions (ASIL) represent premalignant changes in anal squamous cells.
• These lesions are primarily caused by the human papilloma virus (HPV), a known carcinogen.
• High-grade ASIL have a significant progression rate to invasive squamous cell carcinoma, estimated at 12% within 5 years.

Purpose of the Study:

• To review current evidence regarding anal squamous intraepithelial lesions (ASIL).
• To propose a management algorithm for ASIL.
• To guide clinicians in preventing progression to anal cancer.

Main Methods:

• Systematic review of contemporary evidence on ASIL.
• Analysis of progression and regression patterns of ASIL.
• Evaluation of current management strategies for ASIL.

Main Results:

• HPV is the primary driver of ASIL pathophysiology.
• ASIL management involves identifying and treating high-grade lesions.
• Effective management strategies include surveillance, excision, ablative, and topical therapies.

Conclusions:

• Management of ASIL aims to prevent progression to invasive cancer and preserve fecal continence.
• HPV vaccination is a key strategy for primary prevention of ASIL.
• A structured management algorithm is essential for optimal patient outcomes.