Abstract

Background/objectives Tightly-controlled dose reduction was possible during 1 year in psoriasis patients on adalimumab, etanercept or ustekinumab with low disease activity (CONDOR trial). Extended observation is needed to ensure long-term effectiveness and safety of the strategy. With prolonged follow-up, we investigated the clinical effects and safety of the strategy, the proportion of patients with successful dose reduction, and assessed if patients with a disease flare regained remission. Methods Two-year follow up of a subgroup of patients previously included in a randomized pragmatic study comparing usual care (UC) with stepwise dose reduction (DR). Effectiveness (Psoriasis Area and Severity Index, PASI), Dermatology Life Quality Index (DLQI), adverse events, proportion of patients with successful DR and proportion of persistent disease flares were analyzed. Results DR leads temporarily to a slightly increased PASI groupwise, but on the long-term patients regained low PASI. DLQI scores remained stable during follow-up. No serious adverse events due to DR were reported. Forty-one percent of patients remained on a low dose up to 2 years. The number of persistent flares was low in DR and UC. Conclusions The proposed dose reduction strategy is effective for a significant part of patients and remains safe up to 2 years of follow-up.

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