Phase II Randomized Trial of BI 730357, an Oral RORγt Inhibitor, for Moderate-to-Severe Plaque Psoriasis.

Abstract

Trial design: This 2-part, double-blinded trial assessed the RORγt inhibitor BI 730357 in plaque psoriasis.

Methods: In part 1, patients were randomized 2:2:2:2:1 to 25, 50, 100, and 200 mg BI 730357 or placebo once daily (fasting conditions); nonresponders were switched to higher doses. In part 2, a separate patient set was randomized 4:4:1 to receive BI 730357 (400 mg once daily, 200 mg twice daily) or a placebo (fed conditions). Patients from parts 1 and 2 could enter a long-term extension trial. Coprimary endpoints included ≥75% reduction from baseline in PASI75 and static Physician's Global Assessment score of 0/1 (clear/almost clear) at week 12.

Results: In total, 274 patients were treated (178 [part 1] and 96 [part 2]). In part 1, 12 (30.0%) patients achieved PASI75 (P = .0062), and 11 (27.5%) achieved static Physician's Global Assessment of 0/1 (P = .0095) with BI 730357 200 mg versus none receiving placebo. Exposure-response relationship plateaued at ≥200 mg once daily BI 730357. Drug-related adverse events occurred in ≤15.8% of patients. Of 165 patients who entered the long-term extension, 93 (56.4%) achieved PASI75 during treatment, and ≤18.5% experienced a drug-related adverse event.

Conclusions: BI 730357 was well tolerated, with moderate efficacy versus placebo in plaque reduction (clinicaltrials.gov: NCT03635099 and NCT03835481).