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Toorop AA, Wessels MHJ, Gelissen LMY, Hoitsma E, Zeinstra EMPE, van Rooij LC, van Munster CEP, Vennegoor A, Mostert JP, Wokke BHA, Kalkers NF, Hoogervorst ELJ, van Eijk JJJ, Roosendaal CM, Kragt JJ, Eurelings M, van Genugten J, Nielsen J, Sinnige LGF, Kloosterziel ME, Arnoldus EPJ, van Dijk GW, Bouvy WH, Strijbis EMM, van Oosten BW, de Jong BA, Lissenberg-Witte BI, Rispens T, Uitdehaag BMJ, Killestein J, van Kempen ZLE. Influence of personalized extended interval dosing on the natalizumab wearing-off effect - a sub-study of the NEXT-MS trial. J Neurol Sci 2024; 462:123102. [PMID: 38925067 DOI: 10.1016/j.jns.2024.123102] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2024] [Revised: 06/18/2024] [Accepted: 06/19/2024] [Indexed: 06/28/2024]
Abstract
BACKGROUND AND OBJECTIVES Wearing-off symptoms during natalizumab treatment in multiple sclerosis are characterized by an increase of MS-related symptoms prior to natalizumab administration. The influence of extended interval dosing (EID) on wearing-off symptoms are important to consider, as this might cause hesitancy in initiating or continuing EID. METHODS Participants of the NEXT-MS trial, in which treatment intervals are adjusted based on drug concentrations, were divided into two groups: an extended group containing participants with at least one week of additional interval extension, and a group with a fixed interval during the trial (range 4-7 weeks). Changes in the occurrence, frequency, onset, and severity of wearing-off symptoms were evaluated. RESULTS 255 participants were included (extended group n = 171, fixed group n = 84). The odds on occurrence of wearing-off symptoms in the extended group did not increase after extending the treatment interval. Additional analyses for frequency, onset, and severity of wearing-off symptoms showed no changes over time. Mean decrease in natalizumab drug concentration did not influence the frequency of wearing-off symptoms. DISCUSSION Wearing-off symptoms were not reinforced by further extending the natalizumab interval. Wearing-off symptoms might increase in a minority of patients after EID, although our data support the view that wearing-off symptoms appear to be unrelated to the decrease in natalizumab trough drug concentrations.
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Affiliation(s)
- A A Toorop
- MS Center Amsterdam, Neurology, Vrije Universiteit Amsterdam, Amsterdam Neuroscience, Amsterdam UMC location VUmc, Amsterdam, the Netherlands
| | - M H J Wessels
- MS Center Amsterdam, Neurology, Vrije Universiteit Amsterdam, Amsterdam Neuroscience, Amsterdam UMC location VUmc, Amsterdam, the Netherlands
| | - L M Y Gelissen
- MS Center Amsterdam, Neurology, Vrije Universiteit Amsterdam, Amsterdam Neuroscience, Amsterdam UMC location VUmc, Amsterdam, the Netherlands
| | - E Hoitsma
- Department of Neurology, MS center Alrijne Hospital, Leiden, the Netherlands
| | | | - L C van Rooij
- Department of Neurology, Maasstad Hospital, Rotterdam, the Netherlands
| | | | - A Vennegoor
- Department of Neurology, Flevoziekenhuis, Almere, the Netherlands
| | - J P Mostert
- Department of Neurology, Rijnstate Hospital, Arnhem, the Netherlands
| | - B H A Wokke
- Department of Neurology, ErasMS, Erasmus Medical Center, Rotterdam, the Netherlands
| | - N F Kalkers
- Department of Neurology, OLVG, Amsterdam, the Netherlands
| | - E L J Hoogervorst
- Department of Neurology, St Antonius Ziekenhuis, Utrecht, the Netherlands
| | - J J J van Eijk
- Department of Neurology, Jeroen Bosch Ziekenhuis / Hospital, 's Hertogenbosch, the Netherlands
| | - C M Roosendaal
- Department of Neurology, Slingeland Hospital, Doetinchem, the Netherlands
| | - J J Kragt
- Department of Neurology, Reinier de Graaf Hospital, Delft, the Netherlands
| | - M Eurelings
- Department of Neurology, Spaarne Gasthuis, Haarlem, the Netherlands
| | - J van Genugten
- Department of Neurology, Ziekenhuisgroep Twente, Almelo, the Netherlands
| | - J Nielsen
- Department of Neurology, Ommelander Ziekenhuis, Scheemda, the Netherlands
| | - L G F Sinnige
- Department of Neurology, Medisch Centrum Leeuwarden, Leeuwarden, the Netherlands
| | - M E Kloosterziel
- Department of Neurology, Wilhelmina Hospital, Assen, the Netherlands
| | - E P J Arnoldus
- Department of Neurology, Elizabeth TweeSteden Hospital, Tilburg, the Netherlands
| | - G W van Dijk
- Department of Neurology, Canisius Wilhelmina Hospital, Nijmegen, the Netherlands
| | - W H Bouvy
- Department of Neurology, Diakonessenhuis Hospital, Utrecht, the Netherlands
| | - E M M Strijbis
- MS Center Amsterdam, Neurology, Vrije Universiteit Amsterdam, Amsterdam Neuroscience, Amsterdam UMC location VUmc, Amsterdam, the Netherlands
| | - B W van Oosten
- MS Center Amsterdam, Neurology, Vrije Universiteit Amsterdam, Amsterdam Neuroscience, Amsterdam UMC location VUmc, Amsterdam, the Netherlands
| | - B A de Jong
- MS Center Amsterdam, Neurology, Vrije Universiteit Amsterdam, Amsterdam Neuroscience, Amsterdam UMC location VUmc, Amsterdam, the Netherlands
| | - B I Lissenberg-Witte
- Department of Epidemiology and Data Science, Amsterdam. University Medical Centers, Vrije Universiteit Amsterdam, Amsterdam, the Netherlands
| | - T Rispens
- Sanquin Diagnostic Services, Amsterdam, the Netherlands; Department of Immunopathology, Sanquin Research and Landsteiner Laboratory, Amsterdam UMC, University of Amsterdam, Amsterdam, the Netherlands
| | - B M J Uitdehaag
- MS Center Amsterdam, Neurology, Vrije Universiteit Amsterdam, Amsterdam Neuroscience, Amsterdam UMC location VUmc, Amsterdam, the Netherlands
| | - J Killestein
- MS Center Amsterdam, Neurology, Vrije Universiteit Amsterdam, Amsterdam Neuroscience, Amsterdam UMC location VUmc, Amsterdam, the Netherlands
| | - Z L E van Kempen
- MS Center Amsterdam, Neurology, Vrije Universiteit Amsterdam, Amsterdam Neuroscience, Amsterdam UMC location VUmc, Amsterdam, the Netherlands.
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Toorop AA, van Lierop ZY, Gelissen LM, Hoitsma E, Zeinstra EM, van Rooij LC, van Munster CE, Vennegoor A, Mostert JP, Wokke BH, Kalkers NF, Hoogervorst EL, van Eijk JJ, Roosendaal CM, Kragt JJ, Eurelings M, van Genugten J, Nielsen J, Sinnige L, Kloosterziel ME, Arnoldus EP, van Dijk GW, Bouvy WH, Wessels MH, Boonkamp L, Strijbis EM, van Oosten BW, De Jong BA, Lissenberg-Witte BI, Barkhof F, Moraal B, Teunissen CE, Rispens T, Uitdehaag BM, Killestein J, van Kempen ZLE. Prospective trial of natalizumab personalised extended interval dosing by therapeutic drug monitoring in relapsing-remitting multiple sclerosis (NEXT-MS). J Neurol Neurosurg Psychiatry 2024; 95:392-400. [PMID: 37963723 DOI: 10.1136/jnnp-2023-332119] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/29/2023] [Accepted: 10/05/2023] [Indexed: 11/16/2023]
Abstract
BACKGROUND Extended interval dosing (EID) of natalizumab is a promising strategy to optimise treatment in multiple sclerosis (MS). Personalised EID by therapeutic drug monitoring can enable further extension of treatment intervals. METHODS The NEXT-MS trial is an investigator-initiated prospective phase IV non-randomised study. Adults with a diagnosis of relapsing-remitting MS who received ≥6 natalizumab infusions were included in three groups: personalised EID with a target drug trough concentration of 10 µg/mL (EID10), an exploratory group of personalised EID with a target of 5 µg/mL (EID5) and standard interval dosing (SID) of 4 weeks. The primary outcome is radiological disease activity (new/newly enlarged T2 lesions) comparing the EID10 group to a historical cohort of SID (HSID). RESULTS Results of the first phase of the NEXT-MS trial are reported here (n=376) as the study will continue with an amended protocol. In the EID10 group (n=251), incidence rate of radiological activity was 10.0 per 1000 person-years, which was non-inferior to the HSID cohort (24.7 per 1000 person-years (n=87), incidence rate difference 14.7, 90% CI -4.5 to 34.0). Incidence rate of radiological activity was 10.0 per 1000 person-years in the EID5 group (n=65), and 47.0 per 1000 person-years in the SID group (n=60). Serum neurofilament light levels did not increase over time within the EID groups. There were no cases of progressive multifocal leukoencephalopathy. CONCLUSIONS MS disease activity is adequately controlled with personalised natalizumab EID. Interval extension to a drug trough concentration of 5 µg/mL is likely a safe target to extend natalizumab treatment intervals >6 weeks. TRIAL REGISTRATION NUMBER NCT04225312.
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Affiliation(s)
- Alyssa A Toorop
- MS Center Amsterdam, Neurology, Vrije Universiteit Amsterdam, Amsterdam Neuroscience, Amsterdam UMC location VUmc, Amsterdam, The Netherlands
| | - Zoë Ygj van Lierop
- MS Center Amsterdam, Neurology, Vrije Universiteit Amsterdam, Amsterdam Neuroscience, Amsterdam UMC location VUmc, Amsterdam, The Netherlands
| | - Liza My Gelissen
- MS Center Amsterdam, Neurology, Vrije Universiteit Amsterdam, Amsterdam Neuroscience, Amsterdam UMC location VUmc, Amsterdam, The Netherlands
| | - Elske Hoitsma
- Department of Neurology, MS Center, Alrijne Hospital, Leiden, The Netherlands
| | | | - Luuk C van Rooij
- Department of Neurology, Maasstad Hospital, Rotterdam, The Netherlands
| | | | - Anke Vennegoor
- Department of Neurology, Flevoziekenhuis, Almere, The Netherlands
| | - Jop P Mostert
- Department of Neurology, Rijnstate Hospital, Arnhem, The Netherlands
| | - Beatrijs Ha Wokke
- Department of Neurology, ErasMS, Erasmus Medical Center, Rotterdam, The Netherlands
| | - Nynke F Kalkers
- Department of Neurology, OLVG Hospital, Amsterdam, The Netherlands
| | | | - Jeroen Jj van Eijk
- Department of Neurology, Jeroen Bosch Hospital, 's-Hertogenbosch, The Netherlands
| | | | - Jolijn J Kragt
- Department of Neurology, Reinier de Graaf Hospital, Delft, The Netherlands
| | | | | | - Jessica Nielsen
- Department of Neurology, Ommelander Hospital Groningen, Scheemda, The Netherlands
| | - Lgf Sinnige
- Department of Neurology, Medical Center Leeuwarden, Leeuwarden, The Netherlands
| | | | - Edo Pj Arnoldus
- Department of Neurology, Elisabeth TweeSteden Hospital, Tilburg, The Netherlands
| | - Gert W van Dijk
- Department of Neurology, Canisius Wilhelmina Hospital, Nijmegen, The Netherlands
| | - Willem H Bouvy
- Department of Neurology, Diakonessenhuis Hospital, Utrecht, The Netherlands
| | - Mark Hj Wessels
- MS Center Amsterdam, Neurology, Vrije Universiteit Amsterdam, Amsterdam Neuroscience, Amsterdam UMC location VUmc, Amsterdam, The Netherlands
| | - Lynn Boonkamp
- Neurochemistry Laboratory, Department of Clinical Chemistry, Vrije Universiteit Amsterdam, Amsterdam Neuroscience, Amsterdam UMC, location VUmc, Amsterdam, The Netherlands
| | - Eva Mm Strijbis
- MS Center Amsterdam, Neurology, Vrije Universiteit Amsterdam, Amsterdam Neuroscience, Amsterdam UMC location VUmc, Amsterdam, The Netherlands
| | - Bob W van Oosten
- MS Center Amsterdam, Neurology, Vrije Universiteit Amsterdam, Amsterdam Neuroscience, Amsterdam UMC location VUmc, Amsterdam, The Netherlands
| | - Brigit A De Jong
- MS Center Amsterdam, Neurology, Vrije Universiteit Amsterdam, Amsterdam Neuroscience, Amsterdam UMC location VUmc, Amsterdam, The Netherlands
| | - Birgit I Lissenberg-Witte
- Department of Epidemiology and Data Science, Vrije Universiteit Amsterdam, Amsterdam UMC, location VUmc, Amsterdam, The Netherlands
| | - Frederik Barkhof
- Department of Radiology and Nuclear Medicine, Vrije Universiteit Amsterdam, Amsterdam Neuroscience, Amsterdam UMC location VUmc, Amsterdam, The Netherlands
- Queen Square MS Centre, Department of Neuroinflammation, Faculty of Brain Sciences, University College London Hospitals and National Institute for Health Research, London, UK
| | - Bastiaan Moraal
- Department of Radiology and Nuclear Medicine, Vrije Universiteit Amsterdam, Amsterdam Neuroscience, Amsterdam UMC location VUmc, Amsterdam, The Netherlands
| | - Charlotte E Teunissen
- Neurochemistry Laboratory, Department of Clinical Chemistry, Vrije Universiteit Amsterdam, Amsterdam Neuroscience, Amsterdam UMC, location VUmc, Amsterdam, The Netherlands
| | - Theo Rispens
- Diagnostic Services and Immunopathology, Sanquin Research, Amsterdam, The Netherlands
- Department of Immunopathology, Landsteiner Laboratory, University of Amsterdam, Amsterdam UMC, Location AMC, Amsterdam, The Netherlands
| | - Bernard Mj Uitdehaag
- MS Center Amsterdam, Neurology, Vrije Universiteit Amsterdam, Amsterdam Neuroscience, Amsterdam UMC location VUmc, Amsterdam, The Netherlands
| | - Joep Killestein
- MS Center Amsterdam, Neurology, Vrije Universiteit Amsterdam, Amsterdam Neuroscience, Amsterdam UMC location VUmc, Amsterdam, The Netherlands
| | - Zoé LE van Kempen
- MS Center Amsterdam, Neurology, Vrije Universiteit Amsterdam, Amsterdam Neuroscience, Amsterdam UMC location VUmc, Amsterdam, The Netherlands
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3
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Rabea EM, Belal MM, Hafez AH, Elbanna AH, Khalifa MA, Nourelden AZ, Mahmoud NH, Zaazouee MS. Safety and efficacy of extended versus standard interval dosing of natalizumab in multiple sclerosis patients: a systematic review and meta-analysis. Acta Neurol Belg 2024; 124:407-417. [PMID: 38457005 PMCID: PMC10965735 DOI: 10.1007/s13760-024-02480-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2023] [Accepted: 01/12/2024] [Indexed: 03/09/2024]
Abstract
BACKGROUND Multiple sclerosis (MS) is a chronic inflammatory, immune-mediated disease affecting the central nervous system. Natalizumab, an FDA-approved monoclonal antibody for MS, has been explored for its off-label extended interval dosing (EID), suggesting a potential reduction in the risk of progressive multifocal leukoencephalopathy (PML) compared to standard interval dosing (SID). Our objective was to assess the efficacy and safety of EID in comparison to SID for natalizumab treatment in patients with MS. METHODS We searched PubMed, Embase, WOS, Scopus, Ovid, Science Direct, Clinical trials.gov, and Cochrane Library. Our assessed outcomes were clinical relapses, MRI activity, change in expanded disability status scale [EDSS], and the risk of PML. The EID group was defined as 5 to 8 weeks [EID (Q5-8W)]. The analysis was conducted using RevMan ver. 5.4. The effect estimates were presented as a risk ratio [RR] or mean difference with 95% confidence intervals [CI] using SID group as the reference for comparisons. RESULTS Fourteen studies met our inclusion criteria: 2 RCTs, 1 switched single-arm trial, and 12 observational studies. No significant differences were found in all efficacy outcomes of interest. Risk of clinical relapses [RR = 0.90, (95%CI 0.80, 1.02)], risk of new or newly enlarging T2 hyperintense MRI lesions [RR = 0.78, (95%CI 0.59, 1.04)], risk gadolinium enhancing lesions [RR = 1.30, (95%CI 0.98, 1.72)], change in EDSS [MD = 0.09 (95%CI - 0.57, 0.76)], risk of PML [RR = 1.09, 95%CI (0.24, 4.94)]. CONCLUSION In summary, our meta-analysis indicates that natalizumab maintains its effectiveness under extended interval dosing [up to 8 weeks], presenting comparable risks for clinical relapses, MRI lesions, EDSS, and PML. Caution is advised given study limitations and heterogeneity. Robust conclusions necessitate well-designed high-quality prospective studies.
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Affiliation(s)
| | | | | | | | | | | | - Nada H Mahmoud
- Faculty of Medicine, Alexandria University, Alexandria, Egypt
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4
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Jeantin L, Boudot de la Motte M, Deschamps R, Gueguen A, Gout O, Lecler A, Papeix C, Bensa C. Natalizumab extended-interval dosing in a real-life setting. J Neurol Sci 2023; 450:120689. [PMID: 37210938 DOI: 10.1016/j.jns.2023.120689] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2023] [Revised: 05/01/2023] [Accepted: 05/11/2023] [Indexed: 05/23/2023]
Abstract
BACKGROUND Natalizumab is a high-efficacy therapy for recurrent multiple sclerosis (RMS) with a four-week administration interval. Controlled trials have shown that extending this interval to six weeks led to better safety without increasing the risk of relapse. We aimed to analyze the safety of extending the natalizumab interdose interval from 4 to 6 weeks in a real-life setting. METHODS This monocentric retrospective self-controlled study included adult patients with RMS treated with natalizumab with a four-week interval between infusions for a minimum of six months, before switching to a six-week interval. The main outcomes were the incidence of MS relapse, new MRI lesions, and MRI activity signs during the two periods, with patients being their own controls. RESULTS Fifty-seven patients were included in the analysis. The mean (95%CI) annualized relapse rate (AAR) before natalizumab introduction was 1.03 (0.52; 1.55). During the four-week interval dosing period, no patient presented with an MS relapse, and seven (13.5%) patients had new MRI lesions. During the six-week interval dosing period, no relapse was observed and two (3.6%) patients had new MRI lesions. CONCLUSION We did not observe more relapses or signs of MRI activity when extending the interval between natalizumab infusions from four to six weeks.
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Affiliation(s)
- Lina Jeantin
- Neurology department, Hopital Fondation Adolphe de Rothschild, 25-29 rue Manin, Paris, France
| | | | - Romain Deschamps
- Neurology department, Hopital Fondation Adolphe de Rothschild, 25-29 rue Manin, Paris, France
| | - Antoine Gueguen
- Neurology department, Hopital Fondation Adolphe de Rothschild, 25-29 rue Manin, Paris, France
| | - Olivier Gout
- Neurology department, Hopital Fondation Adolphe de Rothschild, 25-29 rue Manin, Paris, France
| | - Augustin Lecler
- Neuroradiology department, Hopital Fondation Adolphe de Rothschild, 25-29 rue Manin, Paris, France
| | - Caroline Papeix
- Neurology department, Hopital Fondation Adolphe de Rothschild, 25-29 rue Manin, Paris, France
| | - Caroline Bensa
- Neurology department, Hopital Fondation Adolphe de Rothschild, 25-29 rue Manin, Paris, France.
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5
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Toorop AA, Steenhuis M, Loeff FC, Weijers SS, Killestein J, Rispens T, van Kempen ZLE. Fingerprick blood samples to measure serum natalizumab concentrations. Mult Scler 2023; 29:457-460. [PMID: 36448735 PMCID: PMC9972227 DOI: 10.1177/13524585221136448] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/05/2022]
Abstract
BACKGROUND Natalizumab via subcutaneous administration was recently approved for patients with multiple sclerosis. OBJECTIVE In light of personalized extended dosing, in which treatment intervals are prolonged to a concentration cut-off, it would be preferable to measure natalizumab drug concentrations in capillary blood. METHODS In this cross-sectional study in patients treated with intravenous (IV) natalizumab, capillary blood samples by fingerprick and venous blood samples were collected in 30 participants prior to IV administration of natalizumab. RESULTS Natalizumab concentrations were similar with a mean bias of -0.36 μg/mL (95% CI: 1.3 to -2 μg/mL). CONCLUSIONS This study shows that physicians can monitor natalizumab drug concentrations by a fingerprick, which could be used for personalized extended dosing.
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Affiliation(s)
- Alyssa A Toorop
- AA Toorop Neurology Outpatient Clinic,
Amsterdam UMC location Vrije Universiteit Amsterdam, De Boelelaan 1117, 1118,
1081 HV Amsterdam, The Netherlands.
| | | | - Floris C Loeff
- Biologics Laboratory, Sanquin Diagnostic
Services, Amsterdam, The Netherlands
| | - Suzanne S Weijers
- Central Diagnostic Laboratory, Amsterdam UMC
location Vrije Universiteit Amsterdam, Amsterdam, The Netherlands
| | - Joep Killestein
- Neurology Outpatient Clinic, Amsterdam UMC
location Vrije Universiteit Amsterdam, Amsterdam, The Netherlands
| | - Theo Rispens
- Biologics Laboratory, Sanquin Diagnostic
Services, Amsterdam, The Netherlands Department of Immunopathology, Sanquin
Research, Amsterdam, The Netherlands Landsteiner Laboratory, Academic
Medical Centre, University of Amsterdam, Amsterdam, The Netherlands
| | - Zoé LE van Kempen
- Neurology Outpatient Clinic, Amsterdam UMC
location Vrije Universiteit Amsterdam, Amsterdam, The Netherlands
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6
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Valentino P, Malucchi S, Martire S, Bava CI, Capobianco MA, Bertolotto A. sNFL applicability as additional monitoring tool in natalizumab extended interval dosing regimen for RRMS patients. Mult Scler Relat Disord 2022; 67:104176. [PMID: 36126541 DOI: 10.1016/j.msard.2022.104176] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2022] [Accepted: 09/09/2022] [Indexed: 12/29/2022]
Abstract
INTRODUCTION Extended interval dosing (EID) of Natalizumab (NAT) has been proposed to reduce progressive multifocal leukoencephalopathy (PML) risk associated with standard interval dosing (SID) in people with multiple sclerosis (MS). Previous studies have suggested that NAT effectiveness is maintained in the great majority of patients who switch from SID to EID; monitoring of disease activity is currently based exclusively on clinical and MRI parameters. Frequent MRI are expensive and not always applicable, underlining the need for biological markers able to detect central nervous system lesions. Serum Neurofilament-light chain (sNFL) currently represents the most promising biomarker of disease activity, prognosis and treatment response in MS, and their clinical suitability is increasingly evident. The objective of the present study is to assess the applicability of sNFL as additional/alternative measure of treatment efficacy during EID regimen. METHODS We measured sNFL by Simoa technology in longitudinal samples from 63 Relapsing Remitting (RR) MS patients switched from SID to EID. INCLUSION CRITERIA diagnosis of RRMS, age 18-60 years; NAT SID for at least 12 months; NEDA-3 (no evidence of disease activity) for at least 12 months; availability of at least 2 serum samples collected 6 months apart. Patients' follow-up time during EID was at least 12 months and 2 blood samples were collected after at least 6 and 12 months. Clinical examination was performed before each infusion, while MRI 6 and 12 months after NAT initiation and according to PML risk during the whole study. RESULTS No patients showed clinical or MRI activity during the whole follow-up. sNFL levels measured during SID and EID were comparable, without significant difference between groups. The effect of EID on NFL levels did not show significant effects (LMM, p> 0.05) and sNFL levels did not vary with time during SID or EID protocols (LMM, p> 0.05). Intra-individual sNFL levels demonstrated overall stability during SID and EID (median CV=11% between SID and EID samples). According to our previously published reference values, sNFL levels were in the normal range in all samples, both during SID and EID. CONCLUSIONS Our results suggest that sNFL quantification can be used as an alternative/additional approach to MRI in managing individual patients. The present work provides a new clinical application of sNFL to monitor NAT efficacy.
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Affiliation(s)
- Paola Valentino
- Neuroscience Institute Cavalieri Ottolenghi (NICO), Regione Gonzole 10, Orbassano 10043, Italy; CRESM Biobank, University Hospital San Luigi Gonzaga, Regione Gonzole 10, Orbassano 10043, Italy.
| | - Simona Malucchi
- Department of Neurology and CRESM, University Hospital San Luigi Gonzaga, Regione Gonzole 10, Orbassano 10043, Italy
| | - Serena Martire
- Neuroscience Institute Cavalieri Ottolenghi (NICO), Regione Gonzole 10, Orbassano 10043, Italy; Department of Neuroscience "Rita Levi Montalcini", University of Turin, Via Cherasco 15, Turin 10100, Italy
| | - Cecilia Irene Bava
- Neuroscience Institute Cavalieri Ottolenghi (NICO), Regione Gonzole 10, Orbassano 10043, Italy
| | - Marco Alfonso Capobianco
- CRESM Biobank, University Hospital San Luigi Gonzaga, Regione Gonzole 10, Orbassano 10043, Italy; Department of Neurology, S. Croce e Carle Hospital, Via Michele Coppino, 26, Cuneo 12100, Italy
| | - Antonio Bertolotto
- Neuroscience Institute Cavalieri Ottolenghi (NICO), Regione Gonzole 10, Orbassano 10043, Italy; Department of Neurology, Koelliker Hospital, C.so Galileo Ferraris, 247/255, Turin 10134, Italy
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