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Orphazyme – Arimoclomol

Background

Arimoclomol is an oral capsule drug that enhances a mechanism known as the heat shock response. When a cell of the body is exposed to stress or damage, the proteins required for the cell’s normal functions can change their shape or “fold” and either lose their ability to do their job or become toxic. Cells protect themselves from this misfolding of proteins by stimulating production of heat shock proteins (Hsps) that are designed to manage the proper protein refolding.

Misfolded and clumped proteins have long been a hallmark of ALS/MND and it is believed that these may contribute to multiple disease processes. Unlike other cells, neurons, and particularly motor neurons, have an impaired ability to produce an effective heat shock response. Therefore, drugs that can enhance the production of Hsps may have therapeutic value in ALS/MND.

Arimoclomol was first published to have an effect on elevating Hsps and delaying disease progression in an ALS/MND mouse model in 2004. In 2008, it was tested for safety, tolerability and pharmacokinetics in 84 people living with ALS/MND by the Northeast ALS Consortium (NEALS), indicating it could be dosed safely up to three times daily at 100 mg per dose and that it effectively crossed the blood-brain barrier. A follow up academic (non pharma, investigator-initiated) clinical trial led by Dr. Michael Benatar, examined arimoclomol in a double-blind, placebo-controlled study of 38 people with fast-progressing ALS caused by SOD1 mutations at 200 mg/day over 12 months. Again, arimoclomol was deemed safe and tolerable but the indication that the drug may slow down disease progression and prolong survival was not statistically significant, and conclusions could not be drawn about its efficacy in ALS/MND. Arimoclomol was considered safe and well-tolerated, with only one person stopping treatment due to skin rash.

Orphazyme was founded in Denmark in 2009 based on work demonstrating that Hsps could also correct an abnormality in a cellular structure called the lysosome, implicated in diseases called lysosomal storage diseases. In advancing arimoclomol as an Hsp-inducing drug for these diseases, the company also initiated an ALS program, using the substantial groundwork to initiate a phase 3 clinical trial.

The multicenter, randomized, double-blind, placebo-controlled study was started in 2018, enrolling 245 people living with ALS, with a 2:1 treatment to placebo ratio and studied over 76 weeks. A measure called the Combined Assessment of Function and Survival (CAFS) was used as the primary means of determining if arimoclomol is effective in ALS, while other common measures like ALSFRS-R, survival and slow vital capacity (SVC) were also evaluated. Arimoclomol is an oral capsule that was taken three times daily for the duration of the study.

Trial Design & Results

On May 7, 2021, an Orphazyme press release stated that the “pivotal trial did not meet primary and secondary endpoints evaluating impact on function and survival”. This indicates that arimoclomol will not be further pursued as a treatment for ALS/MND. In May 2024, a publication on Lancet Neurology confirmed what stated in the press release, with further data suggesting an increase of adverse reactions in the treated compared to the placebo group. 

Summary

Given the available data, it is the opinion of the SAC that there is enough evidence to conclude that at the studied dosage, Arimoclomol did not show overall benefit in individuals living with ALS/MND.

International Alliance of ALS/MND Associations
October 2024


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

Primary Sidebar

  • Gudjon Sigurdsson, Diagnosed 2004 , MND Association of Iceland

    Gudjon Sigurdsson, Diagnosed 2004 , MND Association of Iceland

  • Leon Ryba, Asociación ELA Argentina

    Leon Ryba, Asociación ELA Argentina

  • Rolf Mauch, Association ALS Switzerland, Diagnosed 2015

    Rolf Mauch, Association ALS Switzerland, Diagnosed 2015

  • Lachlan Terry,  MND Australia,  Diagnosed 2015

    Lachlan Terry, MND Australia, Diagnosed 2015

  • Oliver Juenke, DGM, Germany

    Oliver Juenke, DGM, Germany

  • Dr Shelly Hoover

    Dr Shelly Hoover

  • Maria Santos Garcia Tellez, Diagnosed 2017 , FYADENMAC, Mexico

    Maria Santos Garcia Tellez, Diagnosed 2017 , FYADENMAC, Mexico

  • Wilfried Leusing, Diagnosed 2010 , DGM, Germany

    Wilfried Leusing, Diagnosed 2010 , DGM, Germany

  • Aida Trzmiel de Guterman, Asociacion ELA Argentina, Diagnosed 2007, Argentina

    Aida Trzmiel de Guterman, Asociacion ELA Argentina, Diagnosed 2007, Argentina

  • David Bishop

    David Bishop

  • Liam Dwyer, England

    Liam Dwyer, England

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

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

  • Eddy LeFrançois, Diagnosed 1992,  ALS Canada

    Eddy LeFrançois, Diagnosed 1992, ALS Canada

  • Jo Knowlton and her dog, Scotland

    Jo Knowlton and her dog, Scotland

  • Jeff Sutherland

    Jeff Sutherland
    jspic

  • Tison, USA

    Tison, USA

  • Tammy Moore and Eddy Lefrancois

    Tammy Moore and Eddy Lefrancois

  • Maurice Leclerc, Canada

    Maurice Leclerc, Canada

  • Laurie Petit-Jean, Diagnosed 2012 , ARSLA, France

    Laurie Petit-Jean, Diagnosed 2012 , ARSLA, France

  • Ali Var, Turkey

    Ali Var, Turkey

  • Ana María Zavala, FYADENMAC, Diagnosed 2019, Mexico

    Ana María Zavala, FYADENMAC, Diagnosed 2019, Mexico

  • Guido De Mets, Belgium

    Guido De Mets, Belgium

  • Oliver Juenke, Germany

    Oliver Juenke, Germany

  • Natalya Rybakova, Russian Charity ALS Foundation

    Natalya Rybakova, Russian Charity ALS Foundation

  • Wiebke Braach, Deutsche Gesellschaft für Muskelkranke, Germany

    Wiebke Braach, Deutsche Gesellschaft für Muskelkranke, Germany

  • Jose Espinosa, Argentina

    Jose Espinosa, Argentina

  • Jan Zuring, Diagnosed 2010 , The Netherlands

    Jan Zuring, Diagnosed 2010 , The Netherlands

  • IMG_2658

    IMG_2658

  • Mike Rannie,  ALS Canada,  Diagnosed 2017

    Mike Rannie, ALS Canada, Diagnosed 2017

  • Yolanda Armendariz, Diagnosed 2017 , FYADENMAC, Mexico

    Yolanda Armendariz, Diagnosed 2017 , FYADENMAC, Mexico

  • Bob Simonds and Drew O'Neil, USA

    Bob Simonds and Drew O’Neil, USA

  • Dick Dayton, USA

    Dick Dayton, USA

  • Denis Blais, Diagnosed 2015 , ALS Canada

    Denis Blais, Diagnosed 2015 , ALS Canada

  • Len Johnrose,  MND Association,  Diagnosed 2017,  England

    Len Johnrose, MND Association, Diagnosed 2017, England

  • Chen Yin Xue, Taiwan MND Association, Diagnosed 1995, Taiwan

    Chen Yin Xue, Taiwan MND Association, Diagnosed 1995, Taiwan

  • Steve Lufkin, USA

    Steve Lufkin, USA
    IMG_3993

  • March of Faces Photo Submission_ALEX_ELA ARGENTINA

    March of Faces Photo Submission_ALEX_ELA ARGENTINA

  • Michel Perrozzo, ARSLA, Diagnosed 2015, France

    Michel Perrozzo, ARSLA, Diagnosed 2015, France

  • Francisco Perez Palop, Diagnosed 2013 , FUNDELA, Spain

    Francisco Perez Palop, Diagnosed 2013 , FUNDELA, Spain

  • Christian Bär, Germany

    Christian Bär, Germany

  • Conny van der Meijden, Diagnosed 2001,  ALS Netherlands

    Conny van der Meijden, Diagnosed 2001, ALS Netherlands

  • Wendy Hendrickson, ALS Hope Foundation, USA

    Wendy Hendrickson, ALS Hope Foundation, USA

  • Roxana Canova, Diagnosed 2012 ,  Asociación ELA Argentina

    Roxana Canova, Diagnosed 2012 , Asociación ELA Argentina

  • unnamed

    unnamed

  • Angela Jansen, Deutsche Gesellschaft für Muskelkranke e.V.-DGM, Diagnosed 1995, Germany

    Angela Jansen, Deutsche Gesellschaft für Muskelkranke e.V.-DGM, Diagnosed 1995, Germany

  • Roy

    Roy
    roy

  • Greg Heydet, ALS Hope Foundation, USA

    Greg Heydet, ALS Hope Foundation, USA

  • Ian and Teresa Roberts

    Ian and Teresa Roberts

  • Timothy Holman, Switzerland

    Timothy Holman, Switzerland

  • Diana Fernandez, Diagnosed 2009 , Asociación ELA Argentina

    Diana Fernandez, Diagnosed 2009 , Asociación ELA Argentina

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Drugs No Longer in Development

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  • Orphazyme – Arimoclomol
  • TUDCA Trial

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