What is the effect of a standard course of topical fluorouracil cream on photoaging?
In this ad hoc secondary analysis of the Veterans Affairs Keratinocyte Carcinoma ChemopreventionTrial including primarily elderly men with severe sun damage, no statistically significant change in photodamage was observed with a standard course of topical fluorouracil cream using 4 validated photonumeric scales at any time point from baseline to 18 months.
A standard course of topical fluorouracil did not result in detectable improvement of photodamage.
Photoaging, which is premature skin aging caused by long-term UV exposure, is of aesthetic concern to many patients.
To investigate the effect of topical fluorouracil, 5%, cream on photoaging using validated photonumeric scales.
Design, Setting, and Participants
The Veterans Affairs Keratinocyte Carcinoma Chemoprevention Trial was a randomized clinical trial of 932 US veterans with a recent history of 2 or more keratinocyte carcinomas performed from September 30, 2011, through June 30, 2014, to assess the chemopreventive effects of a standard course of topical fluorouracil. Photographs were taken at baseline and at numerous time points for up to 4 years. In our secondary analysis, 2 independent dermatologists graded these photographs using 4 validated photonumeric scales. A total of 3042 photographs from 281 participants randomized to apply topical fluorouracil or placebo were evaluated at baseline, 6 months, 12 months, and 18 months using 4 photonumeric scales (Griffiths scale, Allergan forehead lines scale, melomental folds scale, and crow’s feet scale). Data analysis was performed from November 1, 2016, to January 1, 2017.
Participants were randomized to apply topical fluorouracil, 5%, cream or a vehicle control cream to the face and ears twice daily for 2 to 4 weeks for a total of 28 to 56 doses.
Main Outcomes and Measures
Effect of a standard course of fluorouracil on the extent of photodamage as measured using 4 photonumeric scales.
The study population was predominantly male (274 [97.5%]) and white (281 [100%]), with a mean (SD) age of 71.5 (0.57) years. No statistically significant changes were found in photodamage between baseline and 6 months (Griffiths scale: χ2 = 0.01, P = .93; Allergan forehead lines scale: χ2 = 0.18, P = .67; melomental fold scale: χ2 = 0.03, P = .87; crow’s feet scale: χ2 = 2.41, P = .12), 12 months (Griffiths scale: χ2 = 1.39, P = .24; Allergan forehead lines scale: χ2 = 0.64, P = .43; melomental fold scale: χ2 = 0.12, P = .73; crow’s feet scale: χ2 = 1.07, P = .30), and 18 months (Griffiths scale: χ2 = 3.11, P = .08; Allergan forehead lines scale: χ2 = 0.89, P = .34; melomental fold scale: χ2 = 1.64, P = .20; crow’s feet scale: χ2 = 0.46, P = .50).
Conclusions and Relevance
This study did not demonstrate improvement in photoaging with a standard course of topical fluorouracil, 5%, cream, a finding that may be attributable to a true lack of effect in photodamage or limitations of the photonumeric scales in capturing the effect. The development of photonumeric scales that include manifestations of photoaging other than rhytids, such as lentigines, hyperpigmentation, and telangiectasias, should be considered.
clinicaltrials.gov Identifier: NCT00847912
Korgavkar K, Lee KC, Weinstock MA, for the Veterans Affairs Keratinocyte Carcinoma Chemoprevention (VAKCC) Trial Group. Effect of Topical Fluorouracil Cream on PhotodamageSecondary Analysis of a Randomized Clinical Trial. JAMA Dermatol. Published online September 06, 2017. doi:10.1001/jamadermatol.2017.2578