Background: Epidermal barrier impairment and an altered immune system in atopic dermatitis (AD) may predispose to ultraviolet-induced DNA damage. Objectives: To study the association between AD and actinic keratosis (AK) in a population-based cross-sectional study. Methods: AD was defined by modified criteria of the U.K. working party's diagnostic criteria. AKs were diagnosed by physicians during a full-body skin examination, and keratinocyte cancers were identified via linkage to the national pathology database. The results were analysed in adjusted multivariable and multinomial models. Results: A lower proportion of subjects with AD had AKs than those without AD: 16% vs. 24%, P = 0·002; unadjusted odds ratio (OR) 0·60, 95% confidence interval (CI) 0·42–0·83; adjusted OR 0·74, 95% CI 0·51–1·05; fully adjusted OR 0·69, 95% CI 0·47–1·07. In a multinomial model patients with AD were less likely to have ≥ 10 AKs (adjusted OR 0·28, 95% CI 0·09–0·90). No effect of AD on basal cell carcinoma or squamous cell carcinoma was found: adjusted OR 0·71, 95% CI 0·41–1·24 and adjusted OR 1·54, 95% CI 0·66–3·62, respectively. Conclusions: AD in community-dwelling patients is not associated with AK.

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Journal British Journal of Dermatology
Hajdarbegovic, E, Blom, H, Verkouteren, J.A.C, Hofman, A, Hollestein, L.M, & Nijsten, T.E.C. (2016). Atopic dermatitis is not associated with actinic keratosis: cross-sectional results from the Rotterdam study. British Journal of Dermatology, 175(1), 89–94. doi:10.1111/bjd.14423