PMID: 7544967Sep 1, 1995Paper

Two concentrations of topical tretinoin (retinoic acid) cause similar improvement of photoaging but different degrees of irritation. A double-blind, vehicle-controlled comparison of 0.1% and 0.025% tretinoin creams

Archives of Dermatology
C E GriffithsJ J Voorhees

Abstract

The efficacy of topical tretinoin (all-trans-retinoic acid) in treating photoaging is well established. Questions that remain are (1) whether irritation causes all or part of the improvement; (2) the concentration of tretinoin that maximizes clinical response with minimal side effects; and (3) the effects of long-term treatment on components of the cutaneous immune system. To address these issues, 99 photoaged patients completed a 48-week study using 0.1% tretinoin cream (n = 32), 0.025% tretinoin (n = 35), or vehicle (n = 32) once daily in a double-blind manner. Before and after treatment, we assessed histologic features, keratinocyte expression of HLA-DR and intercellular adhesion molecule-1, numbers of epidermal Langerhans' cells and epidermal and dermal T lymphocytes, and vascularity as measured by dermal endothelial cell area. Both 0.1% and 0.025% tretinoin produced statistically significant overall improvement in photoaging of the face compared with vehicle; there were no clinically or statistically significant differences in efficacy between the two concentrations of tretinoin. After 48 weeks, 0.1% and 0.025% tretinoin produced similar statistically significant epidermal thickening (by 30% and 28%, respectively) compared...Continue Reading

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