Guselkumab Efficacy after Withdrawal Is Associated with Suppression of Serum IL-23-Regulated IL-17 and IL-22 in Psoriasis: VOYAGE 2 Study.

Background: Guselkumab selectively inhibits IL-23 and in psoriasis, produces high clinical responses, including durable maintenance after treatment withdrawal in some patients. The relationships between IL-23 blockade, serum markers downstream of IL-23 signaling, and withdrawal were explored with guselkumab in VOYAGE 2.
Methods: At week 28, patients with ≥90% Psoriasis Area and Severity Index improvement from baseline (PASI 90) were rerandomized to withdrawal and received placebo (n = 182), or maintenance therapy (n = 193). The guselkumab withdrawal group reinitiated guselkumab upon loss of ≥50% of week- 28 PASI improvement or by week 72. Cytokine changes associated with psoriasis recurrence (serum IL-17A, IL-17F, IL-22, and IL-23) after withdrawal were evaluated.
Results: Efficacy in the guselkumab maintenance group was sustained through week 72, whereas efficacy diminished in the guselkumab withdrawal group (PASI 90, 86.0% vs. 11.5%). After 20 weeks of retreatment, 80.4% of guselkumab withdrawal patients achieved PASI 90 responses versus baseline. Maintenance of response after withdrawal was associated with suppression of IL-17A, IL-17F, and IL-22. Increases in cytokine levels had poor predictive power for psoriasis reoccurrence as these increases lagged behind increases in PASI scores.
Conclusion: Upon guselkumab withdrawal, most patients lost clinical response and regained responses with retreatment. Correlation of IL-23 signaling serum cytokines increased with disease recurrence, supporting the role of IL-23 in expansion and maintenance of CD4+ T helper type 17, T helper type 22, and related CD8+ T-cell subsets producing IL-17A, IL-17F, and IL-22.
(Copyright © 2019 The Authors. Published by Elsevier Inc. All rights reserved.)