Deucravacitinib, an Oral, Selective, Allosteric Tyrosine Kinase 2 (TYK2) Inhibitor, in Patients With Moderate to Severe Scalp Psoriasis: Improvement in Scalp-Related Quality of Life and Symptoms in the Phase 3b/4 Multicenter, Randomized, Double-Blinded, Placebo-Controlled PSORIATYK SCALP Trial

Abstract

Introduction: PSORIATYK SCALP (NCT05478499)—an ongoing 52-week, phase 3b/4, multicenter, randomized, double-blinded, placebo-controlled trial—assesses the efficacy and safety of deucravacitinib in patients aged ≥18 years with moderate to severe scalp psoriasis (Psoriasis Scalp Severity Index ≥12, scalp-specific Physician Global Assessment ≥3, scalp surface area involvement ≥20%, and body surface area [BSA] involvement ≥3%). We assessed Week 16 patient-reported outcomes using Scalpdex, a validated, scalp-specific quality-of-life instrument, and numeric rating scales (NRSs) for scalp-specific symptoms.

Methods: Patients were randomized 1:2 to placebo or deucravacitinib 6 mg for 16 weeks, stratified by previous biologic use (yes or no) and body weight (<90 or ≥90 kg). Changes from baseline in Scalpdex total score and NRS scores for scalp-specific itch, pain, and flaking were assessed with an analysis of covariance (ANCOVA) model with treatment and randomization stratification factors as fixed effects and the baseline value as a covariate. Scalpdex total score change from baseline was further assessed in BSA subgroups (BSA 3–10%, BSA >10%), using an ANCOVA model with treatment as a fixed effect and the baseline value as a covariate. P values are nominal.

Results: Mean baseline scores (placebo: n=51; deucravacitinib: n=103) indicated severe impact on quality of life (Scalpdex total score >44.0) and moderate to severe symptoms (NRS ≥4.0). At Week 16, adjusted mean change from baseline (95% CI) in Scalpdex total score was greater in patients receiving deucravacitinib versus placebo (−22.3 [−26.1, −18.6] vs −10.5 [−15.7, −5.2]; P=0.0003). Changes from baseline (95% CI) in scalp-specific NRS measures were greater in patients receiving deucravacitinib versus placebo (itch: −3.2 [−3.7, −2.7] vs −0.7 [−1.4, 0.0]; pain: −2.1 [−2.6, −1.6] vs −0.1 [−0.8, 0.5]; flaking: −3.9 [−4.5, −3.4] vs −1.0 [−1.8, −0.2]; all P<0.0001). In each BSA subgroup, patients receiving deucravacitinib versus placebo reported greater Week 16 change from baseline in Scalpdex total score (BSA 3–10%: −19.8 [−23.9, −15.6] vs −10.5 [−16.1, −4.9]; P=0.0096; BSA >10%: −26.2 [−33.2, −19.3] vs −11.2 [−22.3, 0.0]; P=0.0263).

Conclusion: Deucravacitinib was efficacious in improving scalp-specific psoriasis symptoms and quality of life. Furthermore, scalp-related quality of life was improved in patients receiving deucravacitinib in both BSA subgroups.