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International Alliance of ALS/MND Associations

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AB Science – Masitinib

Background

Masitinib is an oral tyrosine kinase inhibitor that can inhibit macrophage and mast cell proliferation, while also stimulating their apoptosis, thereby reducing neuroinflammatory response. In preclinical SOD1 rat models of ALS/MND, treatment with masitinib seven days after the onset of paralysis resulted in slowed disease progression, decreased microgliosis and extended survival by 40%.

Trial Design & Results

A phase 2/3 clinical trial published in 2019 assessed the potential efficacy of mastinib in ALS/MND. The study was a double-blind, placebo-controlled trial in 394 participants that evaluated two doses of masitinib, 3.0 mg/kg/day and 4.5 mg/kg/day, in combination with riluzole over 48 weeks. A primary efficacy population of participants declared as normal progressors (<1.1 pts/month decline on ALSFRS-R) at the 4.5 mg/kg/day dose were declared to experience benefit vs. placebo, with a statistically significant 27% slowing of decline on the ALSFRS-r. Statistical significance was not achieved in the secondary analysis population consisting of combined normal and fast progressors. A survival analysis from the same trial, published in 2021, demonstrated a significant survival benefit of 25 months versus placebo in a subgroup receiving 4.5 mg/kg/day, having a baseline ALSFRS-R progression rate <1.1pts/month and a score of 2 or more at baseline for each ALSFRS-R component. The preliminary data from this study underpinned the decision to proceed with a phase 3 clinical trial. This is currently recruiting at more than 40 sites in 13 countries, with a goal of 495 participants across three arms; placebo, 4.5 mg/kg/day and 6.0 mg/kg/day. The trial will measure ALSFRS-R over 48 weeks as the primary outcome, with a quality of life measure, progression free survival, SVC, HHD and a combined assessment of function and survival (CAFS) as secondary outcomes. Based on the data obtained from the previous trial, eligibility will require a certain rate of progression and particular total and subscores on each of the items of the ALSFRS-R at screening.

It should also be noted that while masitinib demonstrated reasonable safety and tolerability in the phase 2/3 trial, there is a history of severe adverse events across several trials testing masitinib in various conditions including ischemic heart disease, autoimmune-like hepatitis and Stevens-Johnson Syndrome. There was a higher proportion of severe adverse events in the treatment arms of the trial and one third of the individuals on the 4.5 mg/kg/day dose had adverse events requiring dose reduction. In June 2021, a voluntary hold on worldwide clinical studies of masitinib was announced to investigate the potential risk of ischemic heart disease, which has since been lifted. This information should not discount evaluation of a potential effect in ALS/MND, but is important for treating physicians to be aware of.

The sponsor, AB Science, applied for Marketing Authorisation of masitinib (Alsitek) through the European Medicines Agency (EMA) based on the results of their phase 2/3 trial.  In 2018 the Committee for Medicinal Products for Human Use (CHMP) recommended a refusal of Marketing Authorisation for that application. Following additional analyses conducted on the phase 2/3 trial, the  EMA is currently reviewing masitinib for  conditional Marketing Authorization. Health Canada is also currently reviewing a New Drug Submission for masitinib in the treatment of ALS/MND under the Notice of Compliance with Conditions (NOC/C) policy. Both mechanisms support marketing of a treatment while confirmatory studies are ongoing, with the capacity for the regulators to revoke approval if efficacy is not demonstrated. 

If conditionally approved, the academic and clinical community need to consider whether the existing data from the phase 2/3 study is sufficient to warrant treatment of people with ALS/MND until the phase 3 trial readout occurs. The results of the first study, while intriguing, represent strong preliminary data to inform the ongoing phase 3 trial, but have a number of aspects that make it difficult to determine if the reported effects are due to chance. It should be noted that data from non-pivotal phase 2 or 2/3 studies are expected to provide the required information for designing the optimal phase 3 efficacy trials and questions around the reliability of results at this stage are not unique to this situation.

Summary

Given the available evidence, it is the opinion of the Scientific Advisory Council (SAC) that masitinib is a compound with preliminary results suggestive of a potential effect on ALS/MND progression and survival, but that the clinical and academic community has reservations as to whether the existing data is sufficient to warrant confidence in these effects. The ongoing phase 3 clinical trial is necessary to determine if there is any effect of masitinib in ALS/MND. Should regulatory bodies provide conditional approval of masitinib based on the existing data, further communication will be developed, but until then, there is as-yet no reason to recommend use of masitinib for the treatment of people living with ALS/MND.

International Alliance of ALS/MND Associations
May 2023


The original language of communication is English and any translation cannot be guaranteed for accuracy of messaging.

Primary Sidebar

Drugs in Development

  • AB Science – Masitinib
  • BrainStorm Cell Therapeutics – NurOwn
  • Clene Nanomedicine – CNM-Au8
  • Collaborative Medicinal Development – CuATSM
  • ILB – Tikomed
  • Kadimastem – AstroRx
  • Methylcobalamin
  • Mitsubishi Tanabe Pharma America – Oral Edaravone
  • Neuronata-R/Lenzumestrocel
  • NeuroSense – PrimeC
  • Neuvivo – NP001
  • Prilenia Therapeutics – Pridopidine
  • SOD1 Therapies & Trials
  • T Regulatory Cell Therapies
  • Ulefnersen – Ionis Pharmaceuticals

  • Den Haag, Diagnosed 2016 , The Netherlands

    Den Haag, Diagnosed 2016 , The Netherlands

  • Glen Elison,  ALS Hope Foundation,  Diagnosed 2019,  USA

    Glen Elison, ALS Hope Foundation, Diagnosed 2019, USA

  • Catherine Pearce, Australia

    Catherine Pearce, Australia

  • Shay Rishoni, Diagnosed 2011 , Prize4Life, Israel

    Shay Rishoni, Diagnosed 2011 , Prize4Life, Israel

  • Shera Mukherjee, Diagnosed 2013,  Asha Ek Hope Foundation, India

    Shera Mukherjee, Diagnosed 2013, Asha Ek Hope Foundation, India

  • Jack Buzby, USA

    Jack Buzby, USA

  • England-Lee-Millard, UK

    England-Lee-Millard, UK

  • Sharon Corosanite, Diagnosed 2014 , ALS Hope Foundation, USA

    Sharon Corosanite, Diagnosed 2014 , ALS Hope Foundation, USA

  • Timmy, ALS Liga

    Timmy, ALS Liga

  • Antonio Ventriglia,  ALS Liga Belgium,  Diagnosed 2013

    Antonio Ventriglia, ALS Liga Belgium, Diagnosed 2013

  • Frank "Papa" Taylor, USA

    Frank “Papa” Taylor, USA

  • Xian-Zhang Niu, Diagnosed 2006 , Shaanxi ALS Association, China

    Xian-Zhang Niu, Diagnosed 2006 , Shaanxi ALS Association, China

  • Juvenal Bayona Romero

    Juvenal Bayona Romero

  • Dad

    Dad

  • Conny van der Meijden, Diagnosed 2001,  ALS Netherlands

    Conny van der Meijden, Diagnosed 2001, ALS Netherlands

  • Dawn Morton, Diagnosed 2014 , MND Scotland, UK

    Dawn Morton, Diagnosed 2014 , MND Scotland, UK

  • Zabun Nassar, MND Association, Diagnosed 2016, England

    Zabun Nassar, MND Association, Diagnosed 2016, England

  • Hanne Stenmose, Muskelsvindfonden, Denmark

    Hanne Stenmose, Muskelsvindfonden, Denmark

  • Guido De Mets, Belgium

    Guido De Mets, Belgium

  • 727747090571358167

    727747090571358167

  • Malcolm Buck, Australia

    Malcolm Buck, Australia

  • Steve Lufkin, USA

    Steve Lufkin, USA
    IMG_3993

  • Mike Small, Motor Neurone Disease (MND) Association, UK

    Mike Small, Motor Neurone Disease (MND) Association, UK

  • Tison, USA

    Tison, USA

  • Willi Klein

    Willi Klein

  • Osiel Mendoza, Diagnosed 2016 ,  ALS Therapy Development Institute, USA

    Osiel Mendoza, Diagnosed 2016 , ALS Therapy Development Institute, USA

  • Lin Yong Yi, Taiwan MND Association, Diagnosed 2004

    Lin Yong Yi, Taiwan MND Association, Diagnosed 2004

  • Wilfried Leusing

    Wilfried Leusing

  • Danny Reviers, Diagnosed 1979 , ALS Liga België, Belgium

    Danny Reviers, Diagnosed 1979 , ALS Liga België, Belgium

  • 393647_2252248542053_984912751_n

    393647_2252248542053_984912751_n

  • Rosie Riley, Les Turner ALS Foundation, USA

    Rosie Riley, Les Turner ALS Foundation, USA

  • Yolanda Armendariz, Diagnosed 2017 , FYADENMAC, Mexico

    Yolanda Armendariz, Diagnosed 2017 , FYADENMAC, Mexico

  • Erwin Coppejans, Diagnosed 2007 , ALS Liga België, Belgium

    Erwin Coppejans, Diagnosed 2007 , ALS Liga België, Belgium

  • H. Todd Kelly, Diagnosed 2013 , ALS Hope Foundation, USA

    H. Todd Kelly, Diagnosed 2013 , ALS Hope Foundation, USA

  • Hans Dieter Olszewski, Diagnosed 2010 , DGM, Germany

    Hans Dieter Olszewski, Diagnosed 2010 , DGM, Germany

  • Francisco Perez Palop, Diagnosed 2013 , FUNDELA, Spain

    Francisco Perez Palop, Diagnosed 2013 , FUNDELA, Spain

  • Claire Garry, USA

    Claire Garry, USA
    20200117_214643

  • Mauril Bélanger, Diagnosed 2015 , ALS Canada

    Mauril Bélanger, Diagnosed 2015 , ALS Canada

  • Denis Blais, Diagnosed 2015 , ALS Canada

    Denis Blais, Diagnosed 2015 , ALS Canada

  • Margreth Burger-Saile, Diagnosed 2011,  ALS Schweiz,  Switzerland

    Margreth Burger-Saile, Diagnosed 2011, ALS Schweiz, Switzerland

  • Chun Ju Xiao, China

    Chun Ju Xiao, China

  • Graham Johnson, MND Australia

    Graham Johnson, MND Australia

  • Mahmood Anwar, UK

    Mahmood Anwar, UK

  • Alejandro Aquino, Diagnosed 2011 , Asociación ELA Argentina

    Alejandro Aquino, Diagnosed 2011 , Asociación ELA Argentina

  • Inta Grubb, Diagnosed 2014,  MND Australia

    Inta Grubb, Diagnosed 2014, MND Australia

  • Paul Launer, USA

    Paul Launer, USA

  • Marcelo Farinelli, Diagnosed 2006, ABrELA, Brazil

    Marcelo Farinelli, Diagnosed 2006, ABrELA, Brazil

  • Wilfried Leusing, Diagnosed 2010 , DGM, Germany

    Wilfried Leusing, Diagnosed 2010 , DGM, Germany

  • Ismail Gokcek, Turkey

    Ismail Gokcek, Turkey
    ismail_gokcek_alsmnd_tr

  • Mark Miller

    Mark Miller

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