Marcelo Kremenchutzky

ORCID: 0000-0003-3079-3665
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Research Areas
  • Multiple Sclerosis Research Studies
  • Peripheral Neuropathies and Disorders
  • Polyomavirus and related diseases
  • Systemic Sclerosis and Related Diseases
  • Rheumatoid Arthritis Research and Therapies
  • Systemic Lupus Erythematosus Research
  • Interstitial Lung Diseases and Idiopathic Pulmonary Fibrosis
  • Gut microbiota and health
  • Clostridium difficile and Clostridium perfringens research
  • Immunotherapy and Immune Responses
  • Autoimmune and Inflammatory Disorders Research
  • Cerebral Venous Sinus Thrombosis
  • Liver Diseases and Immunity
  • Mycobacterium research and diagnosis
  • Cytokine Signaling Pathways and Interactions
  • RNA regulation and disease
  • Advanced MRI Techniques and Applications
  • Vagus Nerve Stimulation Research
  • Drug-Induced Hepatotoxicity and Protection
  • Viral Infections and Immunology Research
  • Ultrasound and Hyperthermia Applications
  • Vestibular and auditory disorders
  • Psoriasis: Treatment and Pathogenesis
  • Advanced Neuroimaging Techniques and Applications
  • Gastrointestinal motility and disorders

London Health Sciences Centre
2009-2019

Western University
2009-2018

St Michaels Hospital
2016

University of British Columbia Hospital
2016

Ottawa Hospital
2016

University of Ottawa
2013-2016

Ottawa Hospital Research Institute
2016

Foothills Medical Centre
2016

Novartis (Canada)
2016

Montreal Neurological Institute and Hospital
2016

We report a natural history study of 216 patients with primary progressive (PP)- multiple sclerosis defined by at least 1 year exacerbation-free progression onset. This represents 19.8% largely population-based patient cohort having mean longitudinal follow-up 23 years. subgroup PP-multiple had age onset 38.5 years, females predominating ratio 1.3:1.0. The rate deterioration from disease was substantially more rapid than for relapsing-remitting sclerosis, median time to disability status...

10.1093/brain/122.4.625 article EN Brain 1999-04-01

The clinical features of relapses and progression largely define multiple sclerosis phenotypes. A relapsing course is followed by chronic in some 80% cases within 2 decades. relationship between these phases long-term outcome remains uncertain. We have analysed a well-studied natural history cohort with mean follow-up 25 years. For the entire cohort, median times to reach Disability Status Scale (DSS) 6, 8 10 were 12.7, 20.6 43.9 years, respectively. Among 824 attack-onset patients, great...

10.1093/brain/awh721 article EN Brain 2006-01-09

<h3>Objective:</h3> To examine the effects of interferon beta (IFNβ)-1b on all-cause mortality over 21 years in cohort 372 patients who participated pivotal randomized clinical trial (RCT), retaining (in analysis) original treatment-assignments. <h3>Methods:</h3> For this long-term study, primary outcome, defined before data collection, was comparison between IFNβ-1b 250 μg and placebo groups from time randomization through entire 21-year follow-up interval (intention-to-treat, log-rank test...

10.1212/wnl.0b013e3182535cf6 article EN Neurology 2012-04-12

On the basis of encouraging preliminary results, we conducted a randomized, controlled trial to determine whether minocycline reduces risk conversion from first demyelinating event (also known as clinically isolated syndrome) multiple sclerosis. During period January 2009 through July 2013, randomly assigned participants who had their symptoms within previous 180 days receive either 100 mg minocycline, administered orally twice daily, or placebo. Administration placebo was continued until...

10.1056/nejmoa1608889 article EN New England Journal of Medicine 2017-05-31

Objective: To investigate the effect of teriflunomide on efficacy and safety seasonal influenza vaccine. Methods: The 2011/2012 vaccine (containing H1N1, H3N2, B strains) was administered to patients with relapsing forms multiple sclerosis (RMS) treated for ≥6 months 7 mg (n = 41) or 14 41), interferon-β-1 (IFN-β-1; n 46). primary endpoint proportion strain–specific antibody titers ≥40, 28 days postvaccination. Results: More than 90% achieved postvaccination ≥40 H1N1 in all groups. For were...

10.1212/wnl.0b013e31829e6fbf article EN Neurology 2013-07-13
Ludwig Kappos Gilles Edan Mark S. Freedman Xavier Montalbán Hans‐Peter Hartung and 95 more Bernhard Hemmer Edward Fox Frederik Barkhof Sven Schippling Andrea Schulze Dirk Pleimes Christoph Pohl Rupert Sandbrink Gustavo Cruz Eva‐Maria Wicklein Siegrid Strasser‐Fuchs Thomas Berger K. Vass Christian Sindic Bénédicte Dubois Dominique Dive Valérie Delvaux Jason P. DeBruyne Luanne M. Metz G Rice Marcelo Kremenchutzky Pierre Duquette Yves Lapierre Mark Freedman Anthony Traboulsee Paul O’Connor Pavel Štourač Radomír Taláb Martin Vališ Olga Zapletalová Ivana Kovářová Eva Medová Jiří Fiedler Jette Lautrup Frederiksen Bruno Brochet T. Moreau Patrick Vermersch Jean Pelletier Gilles Edan Michel Clanet David Brassat Pierre Clavelou Christine Lebrun‐Frénay Olivier Gout Mikko Kallela Tuula Pirttilä Juhani Ruutiainen J-P Erälinna Keijo Koivisto Mauri Reunanen I Keskinarkus Irina Elovaara Arno Villringer H. Altenkirch Lars Bauer Mahdiyeh Khabbaz Koche Ghazi Christoph Pohl K. Wessel HP Hartung Wolfgang Steinke B. C. Kieseier Hans Wolfgang Kölmel Patrick Oschmann Martin Berghoff Ricarda Diem B. Kitze Alexander Dressel Francine Hoffmann K. Baum Simon Jung H.-F. Petereit D. Reske Michael Sailer Jürgen Köhler Björn Tackenberg Luisa Klotz Reinhard Hohlfeld Tania Kuempfel K-H Henn Andreas Steinbrecher Klemens Angstwurm Hayrettin Tumani Ralf Gold Peter Rieckmann Christoph Kleinschnitz R Komoly G Gács Gábor Jakab Gyula Pánczél Tünde Csépány László Csiba László Vécsei Ariel Miller Dimitrios Karussis Joab Chapman

To assess outcomes for patients treated with interferon beta-1b immediately after clinically isolated syndrome (CIS) or a short delay.Participants in BENEFIT (Betaferon/Betaseron Newly Emerging MS Initial Treatment) were randomly assigned to receive (early treatment) placebo (delayed treatment). After conversion definite multiple sclerosis (CDMS) 2 years, on could switch another treatment. Eleven years randomization, reassessed.Two hundred seventy-eight (59.4%) of the original 468 (71.3%...

10.1212/wnl.0000000000003078 article EN cc-by-nc-nd Neurology 2016-08-16

Infusion of PDA-001, a preparation mesenchymal-like cells derived from full-term human placenta, is new approach in the treatment patients with multiple sclerosis.This safety study aimed to rule out possibility paradoxical exacerbation disease activity by PDA-001 was phase 1b, multicenter, randomized, double-blind, placebo-controlled, 2-dose ranging including relapsing-remitting sclerosis or secondary progressive sclerosis. The conducted at 6 sites United States and 2 Canada. Patients were...

10.1016/j.msard.2014.08.002 article EN cc-by-nc-nd Multiple Sclerosis and Related Disorders 2014-08-28

<h3>Importance</h3> Intravenous (IV) administration of corticosteroids is the standard care in treatment acute optic neuritis. However, it uncertain whether a bioequivalent dose corticosteroid administered orally, which may be more cost-efficient and convenient for patients, as effective IV <h3>Objective</h3> To determine recovery vision following neuritis with high-dose superior to that an oral corticosteroid. <h3>Design, Setting, Participants</h3> This single-blind (participants unblinded)...

10.1001/jamaneurol.2018.0024 article EN JAMA Neurology 2018-03-05

Patients with MS have an altered gut microbiota compared to healthy individuals, as well elevated small intestinal permeability, which may be contributing the development and progression of disease.We sought investigate if fecal transplantation was safe tolerable in patients it could improve abnormal permeability.Nine were recruited provided monthly FMTs for up six months. The primary outcome investigated change peripheral blood cytokine concentrations. secondary outcomes composition, safety...

10.1177/20552173221086662 article EN cc-by-nc Multiple Sclerosis Journal - Experimental Translational and Clinical 2022-04-01

Classifications of multiple sclerosis subtypes have been largely based on clinical phenomenology. Nevertheless, definitions relapse, remission and progression imprecise. Recently an international consensus group, as part a reclassification disease subtypes, recommended dropping the term 'relapsing-progressive' (RP) retaining 'progressive-relapsing' (PR) sclerosis. The 'RP' had applied when early course combined both relapses was believed to identify some patients with worse than average...

10.1093/brain/122.10.1941 article EN Brain 1999-10-01

Aim An exploratory study of the relationship between cumulative exposure to subcutaneous (sc) interferon (IFN) β-1a treatment and other possible prognostic factors with long-term clinical outcomes in relapsing–remitting multiple sclerosis (RRMS). Methods Patients original PRISMS were invited a single follow-up visit 15 years after initial randomisation (PRISMS-15). Outcomes over compared lowest highest quartile sc IFN dose groups, according total time receiving as continuous variable per 5...

10.1136/jnnp-2014-310024 article EN cc-by-nc Journal of Neurology Neurosurgery & Psychiatry 2015-09-15
David H. Miller Robert J. Fox J. Theodore Phillips Michael Hutchinson Eva Havrdová and 95 more Mariko Kita Claudia A. M. Gandini Wheeler‐Kingshott Daniel J. Tozer David MacManus Tarek Yousry Mary Goodsell Minhua Yang Ray Zhang Vissia Viglietta Katherine Dawson Robert J. Fox J. Theodore Phillips Michael Hutchinson Eva Havrdová Mariko Kita Kate Wilson Minhua Yang Katherine Dawson Jack P. Antel James S. Ware Chris H. Polman Peter R. Kowey Raymond Chung George L. Bakris John R. Richert Burt Seibert David Brandes David Brassat Bruce A. Cohen Ricarda Diem Myla Goldman Robert Herndon Aaron Miller Hayrettin Tumani Teresa Alfaro-Vidal Carolina Lage Crespo Jo Foster K.R. Hunter Almudena Garcia-Gomez David MacManus David Miller Virginia Santana Dan Tozer Claudia A. M. Gandini Wheeler‐Kingshott Tarek Yousry Christopher Kneebone Aliaksandr Fedulau С А Лихачев Elena Mikhailova Halina Naumova D. Decoo Luc Vande Gaer Christian Sindic Sanja Grgić Osman Sinanović Enra Suljić Надежда Делева Dimitar Georgiev Lyubomir Haralanov Sonyia Ivanova I Manchev Dimitar Minchev P. Stamenova Ivailo Tournev Elena Vacheva Zahari Zahariev Amit Bar-Or Gregg Blevins Marcelo Kremenchutzky Felix Veloso Norbert Witt Roberto Vargas Howell Alexander Parajeles Vindas Mario Habek Josip Rudež Silva Soldo-Butković Ranka Baraba Vurdelja David Doležil Eva Havrdová Jiří Nova'k Daniel Václavík Katrin Antsov Katrin Gross‐Paju Sulev Haldre Alla Palu Toomas Toomsoo Abdullatif Al Khedr William Camu Marc Debouverie Gilles Defer de Sèze Pierre Labauge Thibault Moreau Jean Pelletier L. Rumbach

<h3>Objective:</h3> To evaluate the effects of oral delayed-release dimethyl fumarate (DMF; also known as gastro-resistant DMF) on MRI lesion activity and load, atrophy, magnetization transfer ratio (MTR) measures from Comparator an Oral Fumarate in Relapsing-Remitting Multiple Sclerosis (CONFIRM) study. <h3>Methods:</h3> CONFIRM was a 2-year, placebo-controlled study efficacy safety DMF 240 mg twice (BID) or 3 times daily (TID) 1,417 patients with relapsing-remitting multiple sclerosis...

10.1212/wnl.0000000000001360 article EN cc-by-nc-nd Neurology 2015-02-14

To evaluate the potential of quantitative susceptibility (QS) and R2* mapping as surrogate biomarkers clinically relevant, age-adjusted demyelination iron deposition in multiple sclerosis (MS).All study participants gave written informed consent, was approved by institutional review board. Quantitative maps magnetic resonance imaging parameters (R2* QS) were computed for 25 patients with either isolated syndrome (CIS) or relapsing-remitting MS, well 15 age- sex-matched control subjects...

10.1148/radiol.14132475 article EN Radiology 2014-05-14
Gavin Giovannoni Jeffrey Cohen Alasdair Coles Hans-Peter Hartung Eva Havrdová and 95 more Krzysztof Selmaj David Margolin Stephen Lake Susan M. Kaup Michael Panzara D. A. S. Compston Douglas L. Arnold Jeffrey Cohen Alasdair Coles Alastair Compston Christian Confavreux Edward Fox Hans-Peter Hartung Eva Havrdová Krzysztof Selmaj Howard L. Weiner Hillel S. Panitch David B. Clifford Jack P. Antel Frederik Barkhof David R. Snydman Leslie J. DeGroot Douglas B. Cines Ralph B. D’Agostino Benjamin Greenberg Jörg Krauss Volker Limmroth Clyde Markowitz Robert T. Naismith David Tabby Norma Deri Karyn Boundy Simon Broadley Michael Dreyer Suzanne Hodgkinson John O. King Richard Macdonell FAFRM RACP Pamela McCombe Mark Paine Stephen W. Reddel Raymond Schwartz Steve Vucic MD. Karl Vass PhD Dominique Dive Bénédicte Dubois Christian Sindic Dagoberto Callegaro Maria Lúcia Brito Ferreira Marcio Mena Barreto Martins Charles Peter Tilbery Charles Ayotte Donald Brunet Mark Freedman François Grand’Maison François Jacques Marcelo Kremenchutzky Anthony Traboulsee MD Licia Antonelli Vesna Brinar Mario Habek Spomenka Kiđemet Piskač Zlatko Trkanjec Anton Vladić Ivana Kovářová Ivan Rektor Radomír Taláb Marta Vachová Thor Petersen Mads Ravnborg Per Soelberg Sørensen Michel Clanet Pierre Clavelou de Sèze Marc Debouverie Gilles Edan Catherine Lubetzki Thibault Moreau Patrick Vermersch Karl Baum Judith Haas Bernhard Hemmer Ulrich Herrlinger Wolfgang Köhler G. Ochs Martin Stangel Hayrettin Tumani Péter Urbán Uwe K. Zettl Tjalf Ziemssen Anat Achiron Arnon Karni Adi Vaknin Dembinsky Antonio Bertolotto Ruggero Capra

<h3>Objective:</h3> To characterize effects of alemtuzumab treatment on measures disability improvement in patients with relapsing-remitting multiple sclerosis (RRMS) inadequate response (≥1 relapse) to prior therapy. <h3>Methods:</h3> Comparison Alemtuzumab and Rebif Efficacy Multiple Sclerosis (CARE-MS) II, a 2-year randomized, rater-blinded, active-controlled, head-to-head, phase 3 trial, compared efficacy safety 12 mg subcutaneous interferon-β-1a (SC IFN-β-1a) 44 μg RRMS. Prespecified...

10.1212/wnl.0000000000003319 article EN cc-by-nc-nd Neurology 2016-10-13

There are few studies reporting multiple sclerosis prevalence rates in the Buenos Aires region, Argentina (latitude 34°S) (between 12–18.5/100 000 inhabitants), and no have been performed larger region between parallels 36° 55°S. The aim of this study is to determine clinical features residents Argentine Patagonia. Four cities from were selected for study, giving a sample population 417 666 inhabitants (~24% total Patagonia population). 1 st March 2002 was determined as day. Patients...

10.1177/1352458507085801 article EN Multiple Sclerosis Journal 2008-06-01

Approximately 85% of multiple sclerosis (MS) cases begin as clinically isolated syndromes (CIS). Results from the Controlled High-Risk Subjects Avonex ® Multiple Sclerosis Prevention Study (CHAMPS) demonstrated that, in patients with CIS, treatment intramuscular (IM) interferon beta-1a (IFNβ-1a) 30 μg once weekly delayed conversion to definite MS (CDMS) total population and subgroups based on presenting baseline magnetic resonance imaging (MRI) characteristics. Changes clinical MRI risk...

10.1177/1352458509103173 article EN Multiple Sclerosis Journal 2009-05-29

Compared with controls, multiple sclerosis (MS) patients die, on average, 7-14 years prematurely. Previously, we reported that, 21 after their participation in the pivotal randomised, controlled trial (RCT) of interferon β-1b, mortality was reduced by 46-47% two groups who received active therapy during RCT. To determine whether excessive deaths observed placebo-treated due to MS-related causes, analysed causes-of-death (CODs) these three, patient cohorts.Long-term follow-up (LTF) RCT...

10.1136/bmjopen-2012-001972 article EN cc-by-nc BMJ Open 2012-01-01
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