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This study evaluated the pharmacokinetics (PK), efficacy, safety, and tolerability of bleselumab – a fully‐human anti‐CD40 monoclonal recombinant IgG4. Patients with moderate‐to‐severe psoriasis were randomized on day 1 to receive bleselumab or placebo on days 1, 15 and 29 in a dose‐escalation of bleselumab at 0.1, 0.3, 1.0 or 3.0 mg/kg. The safety‐analysis set (SAF) and full‐analysis set (FAS) included all patients who received bleselumab or placebo, and the PK‐analysis set (PKAS) included patients in the SAF with ≥1 quantifiable serum bleselumab concentration. Serial blood samples were collected after each dose, and the bleselumab serum concentration was measured. After each dose, the area‐under‐the‐concentration–time curve over 336 hours (AUC 336 ) and the maximum serum concentration (C max ), and dose proportionality of AUC 336  and C max  were determined. The psoriasis area and severity index (PASI) score, the physician static global assessment (PSGA) score, the percentage body surface area (%BSA) affected with psoriasis, adverse events and laboratory parameters were assessed. Sixty patients were randomized and included in the SAF/FAS (bleselumab,  n  = 49; placebo,  n  = 11); 48 formed the PKAS. Bleselumab C max  and AUC 336  were more than dose proportional in the range 0.1–3.0 mg/kg, suggesting nonlinear PK after single/multiple doses. No clinically significant infusion reactions, cytokine‐release syndrome, or thromboembolic events were reported. Bleselumab did not improve the PASI scores, PSGA scores, or %BSA versus placebo. Transient elevation of alanine aminotransferase and aspartate aminotransferase levels by >3 × upper limit of normal were observed in four (8.2%) and two (4.1%) patients, respectively, in the 1.0 or 3.0 mg/kg groups. Patients with liver function test increases had no concurrent changes in bilirubin. Bleselumab demonstrated nonlinear PK after single and multiple doses, with few adverse reactions.

Randomized, controlled study of bleselumab (ASKP1240) pharmacokinetics and safety in patients with moderate‐to‐severe plaque psoriasis