Phase II Randomized Controlled Trial to Evaluate the Clinical and Histological Effects of Oral Isotretinoin for the Treatment of Photoaging on Face and Forearms

Clinical assessment ranging from -2=very bad to +2=very good for all patients. Also, profilometry, corneometer and skin elasticity tests in periocular regions and left forearm; skin biopsy on left forearm before/after treatment in B and in 10 randomly selected patients from A. Microscopic evaluation of corneal layer and epidermal thickness, dermal elastosis, new collagen and p53 epidermal expression performed by quantitative digital image analysis. Blind evaluations (group/time) conducted by two independent observers.

Clinical evaluation results showed no alterations (0) or slight improvement (+1) for all patients; profilometry, corneometer and skin elasticity measurements presented a significant difference in pre and post treatment values (p=0,001 to 0,028) with no differences between A/B. Regarding histological findings and p53 expression no previous differences between groups before the treatment were observed (p>0,1).Quantitative microscopic digital analysis demonstrated no differences between groups at the end of the study for the majority of variables. However, slight but significant difference between A/B subjects was found for p53 with major expression reduction for those treated with oral isotretinoin [0,66±0,31 vs 0,94±0,34 respectively (p=0,04)]. The main side effects were cheilitis in 15 patients (75%) and xerophthalmia in 5 (25%). No significant alterations occurred in biochemical tests.