A Pivotal Study of N-Acetyl-L-Leucine on Niemann-Pick Disease Type C

Summary

A pivotal, randomized, double-blind, placebo controlled, multi-center therapeutic study for patients age 4 and older with a confirmed diagnosis of Niemann Pick disease type C (NPC). The objective of this study is to evaluate the safety, tolerability and efficacy of N-acetyl-L-leucine (IB1001) compared to standard of care. Following this randomized, double-blind, placebo-controlled "Parent Study", an extension phase is conducted for (1) patients who completed the "Parent Study" and (2) patients who are enrolled directly into the Extension Phase. Currently, the Extension Phase provides patients with 3 years of open-label treatment.

Timeline

Start

2022-06-30

Primary completion

2030-06-12

Completion

2030-12

Outcome

Met primary endpoint

paper least-squares mean difference, -1.28 points; 95% confidence interval, -1.91 to -0.65; P<0.001). PMID 38294974 ↗

Publications

• Results Bremova-Ertl T, Claassen J, Foltan T, Gascon-Bayarri J, Gissen P, Hahn A, Hassan A, Hennig A, Jones SA, Kolnikova M, Martakis K, Raethjen J, Ramaswami U, Sharma R, Schneider SA. Efficacy and safety of N-acetyl-L-leucine in Niemann-Pick disease type C. J Neurol. 2022 Mar;269(3):1651-1662. doi: 10.1007/s00415-021-10717-0. Epub 2021 Aug 13.
• Results Kaya E, Smith DA, Smith C, Morris L, Bremova-Ertl T, Cortina-Borja M, Fineran P, Morten KJ, Poulton J, Boland B, Spencer J, Strupp M, Platt FM. Acetyl-leucine slows disease progression in lysosomal storage disorders. Brain Commun. 2020 Dec 20;3(1):fcaa148. doi: 10.1093/braincomms/fcaa148. eCollection 2021.
• Results Cortina-Borja M, Te Vruchte D, Mengel E, Amraoui Y, Imrie J, Jones SA, I Dali C, Fineran P, Kirkegaard T, Runz H, Lachmann R, Bremova-Ertl T, Strupp M, Platt FM. Annual severity increment score as a tool for stratifying patients with Niemann-Pick disease type C and for recruitment to clinical trials. Orphanet J Rare Dis. 2018 Aug 16;13(1):143. doi: 10.1186/s13023-018-0880-9.
• Hendrickx N, Mentre F, Hamdan A, Karlsson MO, Hooker AC, Traschutz A, Gagnon C, Schule R, Synofzik M, Comets E; ARCA Study Group, EVIDENCE-RND consortium. Comparing randomized trial designs to estimate treatment effect in rare diseases with longitudinal models: a simulation study showcased by Autosomal Recessive Cerebellar Ataxias using the SARA score. BMC Med Res Methodol. 2025 Jul 30;25(1):179. doi: 10.1186/s12874-025-02626-x.
• Patterson MC, Ramaswami U, Donald A, Foltan T, Gautschi M, Gissen P, Hahn A, Jones SA, Kay R, Kolnikova M, Park J, Reichmannova S, Walterfang M, Wibawa P, Rohrbach M, Martakis K, Bremova-Ertl T. Disease-Modifying, Neuroprotective Effect of N-Acetyl-l-Leucine in Adult and Pediatric Patients With Niemann-Pick Disease Type C. Neurology. 2025 Jul;105(1):e213589. doi: 10.1212/WNL.0000000000213589. Epub 2025 Jun 13.
• Bremova-Ertl T, Ramaswami U, Brands M, Foltan T, Gautschi M, Gissen P, Gowing F, Hahn A, Jones S, Kay R, Kolnikova M, Arash-Kaps L, Marquardt T, Mengel E, Park JH, Reichmannova S, Schneider SA, Sivananthan S, Walterfang M, Wibawa P, Strupp M, Martakis K. Trial of N-Acetyl-l-Leucine in Niemann-Pick Disease Type C. N Engl J Med. 2024 Feb 1;390(5):421-431. doi: 10.1056/NEJMoa2310151.

Drugs

Indications