Dreno, BrigitteCerio, RinoDirschka, ThomasFigueras Nart, IgnasiLear, John T.Peris, KettyRuiz de Casas, AndrésKaleci, ShanikoPellacani, GiovanniProgressing Evidence in AK (PEAK) Working Group2018-09-042018-09-042017-10-01https://hdl.handle.net/2445/124260Actinic keratosis (AK) lesions are surrounded by field cancerization (areas of subclinical, non-visible sun damage). Existing AK grading tools rely on AK counts, which are not reproducible. An Actinic Keratosis Field Assessment Scale (AK-FAS) for grading the severity of AK/field was developed. Standardized photographs of patients representing the full range of AK severity were collected. Six investigators independently rated each photograph according to 3 criteria: AK area (total skin area affected by AK lesions), hyperkeratosis and sun damage. Inter-rater reproducibility was good for all 3 criteria. Validation of the AK-FAS showed good reproducibility for AK area and hyperkeratosis, even for dermatologists untrained on use of the scale. In conclusion, the AK-FAS is objective, easy to use and implement, and reproducible. It incorporates assessment of the entire field affected by AK instead of relying on lesion counts. Use of the AK-FAS may standardize AK diagnosis, making it relevant to routine clinical practice.6 p.application/pdfengcc by-nc (c) Acta Dermato-Venereologica, 2017http://creativecommons.org/licenses/by-nc/3.0/es/TumorsMalalties de la pellSkin diseasesinfo:eu-repo/semantics/article2018-07-24info:eu-repo/semantics/openAccess28536731