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Efficacy of anti-sclerostin monoclonal antibody BPS804 in adult patients with hypophosphatasia

Seefried, Lothar, Baumann, Jasmin, Hemsley, Sarah, Hofmann, Christine, Kunstmann, Erdmute, Kiese, Beate, Huang, Yue, Chivers, Simon, Valentin, Marie-Anne, Borah, Babul, Roubenoff, Ronenn, Junker, Uwe and Jakob, Franz (2017) Efficacy of anti-sclerostin monoclonal antibody BPS804 in adult patients with hypophosphatasia. Journal of Clinical Investigation, 127 (6). pp. 2148-2158. ISSN 1558-8238


BACKGROUND. Hypophosphatasia (HPP) is a rare genetic disorder resulting in variable alterations of bone formation and mineralization that are caused by mutations in the ALPL gene, encoding the tissue-nonspecific alkaline phosphatase (ALP) enzyme. METHODS. In this phase IIA open-label, single-center, intra-patient, dose-escalating study, adult patients with HPP received 3 ascending intravenous doses of 5, 10, and 20 mg/kg BPS804, a fully human anti-sclerostin monoclonal antibody, on days 1, 15, and 29, respectively. Patients were followed for 16 weeks after the last dose. We assessed the pharmacodynamics, pharmacokinetics, preliminary efficacy, and safety of BPS804 administrations at specified intervals during treatment and follow-up. RESULTS. Eight patients (mean age 47.8 years) were enrolled in the study (6 females, 2 males). BPS804 treatment increased mean ALP and bone-specific ALP enzymatic activity between days 2 and 29. Transient increases in the bone formation markers procollagen type-I N-terminal propeptide (PINP), osteocalcin, and parathyroid hormone as well as a transient decrease in the bone resorption marker C-telopeptide of type I collagen (CTX-1) were observed. Lumbar spine bone mineral density showed a mean increase by day 85 and at end of study. Treatment-associated adverse events were mild and transient. CONCLUSION. BPS804 treatment was well tolerated and resulted in increases in bone formation biomarkers and bone mineral density, suggesting that sclerostin inhibition could be applied to enhance bone mineral density, stability, and regeneration in non-life-threatening clinical situations in adults with HPP.

Item Type: Article
Date Deposited: 29 Nov 2017 00:45
Last Modified: 25 Jan 2019 00:45


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