Upadacitinib treatment withdrawal and retreatment in patients with moderate-to-severe atopic dermatitis: Results from a phase 2b, randomized, controlled trial.

Background: Atopic dermatitis (AD) is a chronic inflammatory skin disease characterized by pruritic eczematous lesions. The effect of treatment withdrawal after response to upadacitinib oral treatment is not fully characterized.

Objectives: Assess the effect of upadacitinib withdrawal on skin clearance and itch improvement in adult patients with moderate-to-severe AD and evaluate the kinetics of recovery on rescue treatment.

Methods: Data from a phase 2b randomized, placebo-controlled trial (NCT02925117) of upadacitinib in patients with moderate-to-severe AD were analysed. Patients were randomized 1:1:1:1 to receive upadacitinib 7.5 mg, 15 mg, 30 mg or placebo, and then at Week 16, patients were re-randomized 1:1 to receive the same dose of upadacitinib (upadacitinib 30 mg for patients initialized to placebo) or placebo. From Week 20, those who experienced loss of response defined as Eczema Area and Severity Index <50% improvement from baseline (EASI 50) received rescue treatment with upadacitinib 30 mg.

Results: Patients who withdrew from upadacitinib experienced a rapid loss of skin clearance response, while those who switched from placebo to upadacitinib gained response. Loss of skin clearance response occurred within 4 weeks and worsening of itch occurred within 5 days. In patients who originally received placebo or a lower dose of upadacitinib leading to a loss of EASI response, rescue treatment with upadacitinib 30 mg resulted in rapid recovery or improvement of both skin and itch responses; most patients who were re-randomized to placebo achieved EASI 75 and IGA 0/1 by 8 weeks of rescue treatment. No new safety risks were observed.

Conclusions: Continuous treatment with upadacitinib is suggested to maintain skin clearance and antipruritic effects.