Dimethyl fumarate treatment for psoriasis in a real-life setting: a multicentric retrospective study.

Corazza, Monica; Odorici, Giulia; Conti, Andrea; Di Lernia, Vito; Motolese, Alberico; Bardazzi, Federico; Di Nuzzo, Sergio; Monti, Alberto; Arginelli, Federica; Filippi, Federica; Valpiani, Giorgia; Morotti, Chiara; Borghi, Alessandro

BACKGROUND Dimethyl fumarate (DMF) is a fumaric acid esters derivate approved for plaque psoriasis as first-line systemic therapy. It has been available in Italy since 2017 and an increasing number of patients are treated with this drug. OBJECTIVES To evaluate DMF effectiveness, side effects and drug survival in a dermatological real-life setting. METHODS We performed a retrospective multi-center study in 5 dermatologic clinics in Emilia-Romagna, Northern Italy, which included all consecutive patients affected by moderate-severe psoriasis treated with DMF. We assessed effectiveness (in terms of PASI50 and PASI75 in a intention to treat observation) and safety (occurrence of side effects) of DMF and their association with demographic and disease characteristics, mean daily dose taken and treatment discontinuation. RESULTS We included 103 patients, 78 (75.72%) had at least one comorbidity including 19 (18.44%) with a history of cancer; the mean treatment duration was 23.61 ± 17.99 weeks (min 4, max 130) and the mean daily dose was 262.13 ± 190.94 mg. Twenty-four patients (23.30%) reached PASI75 at week 12, while a further 18 patients (17.47%) reached it at week 26. Side effects occurred in 63 patients (61.16%), the most frequent were: diarrhea, epigastric discomfort, nausea and flushing. Sixteen patients (15.53%) showed an alteration of laboratory tests. In some cases side effects were transitory, while in 53 patients (51.45%) they led to cessation of therapy. The median daily dose showed a direct association with PASI50 achievement and an indirect association with treatment discontinuation. CONCLUSIONS Our study shows the peculiarities of DMF in a real-world setting: effectiveness is often reached after 12 weeks of treatment and side effects could limit the continuation of the therapy but, at the same time, DMF has no major contraindications and, due to the wide range of dosage, it can allow both to manage side effects and to personalize the prescription for each patient. This article is protected by copyright. All rights reserved.