Phase 1a/1b, first-in-human study to evaluate safety and tolerability for investigational ARQ-234 in healthy volunteers and adults with moderate to severe atopic dermatitis ARQ-234 is a potent fusion-protein agonist of the CD200 receptor (CD200R), an immune-regulatory checkpoint involved in maintaining immune balance WESTLAKE VILLAGE, Calif., March 03, 2026 (GLOBE NEWSWIRE) -- Arcutis Biotherapeutics, Inc. (Nasdaq: ARQT), a commercial-stage biopharmaceutical company focused on developing meaningful innovations in immuno-dermatology, today announced that the first participant has been enrolled in a Phase 1a/1b, double-blind, randomized, placebo-controlled study, ARQ-234-131, evaluating the safety and tolerability of ARQ-234.