Background: Ustekinumab has been evaluated in Caucasian patients with psoriasis, but no studies have been conducted in Asian patients.

Objective: To assess the efficacy and safety of ustekinumab in Taiwanese and Korean patients with moderate-to-severe psoriasis.

Methods: In this 36-week, multicenter, double-blind, placebo-controlled study, 121 patients with moderate-to-severe psoriasis were randomized (1:1) to receive subcutaneous injections of ustekinumab 45mg at weeks 0, 4, 16 or placebo at weeks 0, 4 and ustekinumab 45mg at weeks 12, 16. Efficacy endpoints at week 12 included the proportion of patients achieving at least 75% improvement from baseline in Psoriasis Area and Severity Index (PASI 75; primary endpoint), proportion of patients with Physician's Global Assessment (PGA) of cleared or minimal, and change from baseline in Dermatology Life Quality Index (DLQI).

Results: At week 12, the proportion of patients achieving PASI 75 was 67.2% and 5.0% in the ustekinumab 45mg and placebo groups, respectively (p<0.001). PGA of cleared or minimal was achieved by 70.5% (ustekinumab) and 8.3% (placebo; p<0.001), and median DLQI changes were -11.0 and 0.0, respectively (p<0.001). Efficacy was maintained through week 28 in ustekinumab-treated patients. Adverse event (AE) profiles at week 12 were similar between the ustekinumab and placebo groups: 65.6% and 70.0%, respectively, had at least one reported AE. Through week 36, no disproportionate increase in AEs was observed, with the exception of abnormal hepatic function, which was related to concomitant isoniazid treatment for latent tuberculosis. Injection-site reactions were rare and mild. No deaths, malignancies, or cardiovascular events were reported.

Conclusions: Treatment with subcutaneous ustekinumab 45mg offers a favorable benefit/risk profile for Taiwanese and Korean patients with moderate-to-severe psoriasis. The efficacy and safety profile is consistent with the global phase III studies of ustekinumab in psoriasis.