Interventions for actinic keratoses

Area of Science:

• Dermatology
• Oncology
• Evidence-based Medicine

Background:

• Actinic keratoses (AKs) are sun-induced skin lesions with potential to progress to squamous cell carcinoma.
• Treatment is sought for cosmetic reasons, symptom relief, and skin cancer prevention.
• Interventions include individual lesion-based and field-directed therapies, varying in efficacy, safety, and cosmetic outcomes.

Purpose of the Study:

• To assess the efficacy and safety of various interventions for actinic keratosis.
• To compare topical, oral, mechanical, and chemical treatment modalities.

Main Methods:

• Systematic review and meta-analysis of 83 randomized controlled trials (RCTs) involving 10,036 participants.
• Searched multiple databases up to March 2011, including Cochrane, MEDLINE, EMBASE, and LILACS.
• Data abstracted independently by two authors, assessing risk of bias and performing meta-analyses for dichotomous and continuous outcomes.

Main Results:

• Field-directed treatments (diclofenac, 5-fluorouracil, imiquimod, ingenol mebutate) significantly improved complete clearance rates compared to placebo.
• Photodynamic therapy (PDT) with ALA or MAL demonstrated superior clearance for individual lesions compared to placebo and cryotherapy.
• Adverse events and cosmetic outcomes varied among treatments; imiquimod and PDT showed better cosmetic results than cryotherapy and 5-fluorouracil.

Conclusions:

• Photodynamic therapy is more effective with better cosmetic outcomes for individual actinic keratosis lesions than cryotherapy.
• Field-directed treatments (diclofenac, 5-fluorouracil, imiquimod, ingenol mebutate) exhibit similar efficacy but differ in adverse events and cosmetic results.
• Further direct comparative studies are needed to establish optimal therapeutic strategies for actinic keratosis.