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A Study to Investigate Long-term Safety and Tolerability of Frexalimab in Participants With Multiple Sclerosis

10 november 2026 bijgewerkt door: Sanofi

A Phase 3 Extension Study to Investigate Long-term Safety and Tolerability of Frexalimab in Participants With Multiple Sclerosis.

Study LTS18002 is a global, multicenter, open-label (OL), Phase 3, long-term safety and efficacy extension study.

The purpose of this study is to provide continued access to frexalimab for participants with MS, and to evaluate the long-term safety and efficacy profile of frexalimab. This study will monitor delayed AEs, assess the durability of safety findings and characterize any emerging safety signals that may develop over an extended follow up period.

Study details include:

  • The study duration will be up to 4 years.

  • The OL treatment duration will be up to 96 weeks (corresponding to approximately 2 years) per participant.

  • There is an additional 24 weeks of safety follow up from the last dose of OL frexalimab for all participants (safety follow-up period/EOS: 4, 12 and 24 weeks after last investigational medicinal product(IMP) or OL frexalimab administration).

  • The number of visits over the 2-year duration will be dependent on subgroup assignment which is based on parent study from which the participant has entered the LTS18002 :

    1. ACT16877, EFC17504, EFC18098, and ASY22814 participants

      • Will have on-site visits every 12 weeks (9 visits)

        • Additionally, there will be 16 on-site visits for OL frexalimab administration (Week 4, 8, 16, 20, 28, 32, 40, 44, 52, 56, 64, 68, 76, 80, 88, and 92) for all participants EXCEPT those entering from EFC18098 (frexalimab open label administration is conducted at home via SC large volume (OBDS VT) device)

          • There will be 3 follow up visits beginning 4 weeks after the last administration of OL frexalimab

            • Home administration is allowed for participants from ACT16877, based on Investigator judgement, participant/caregiver training and local availability. Home nurse services are mandatory for at-home administration.

              • Home nurse services for at home administration may be considered for EFC17504 participants after Week 24 administration of OL frexalimab, based on availability. Participants that have initiated OL frexalimab via home administration during the parent study may continue to receive it in this manner.

                • NOTE: For participants from EFC17504, all on-site visits including monthly IMP administrations will include safety labs (biochemistry, hematology liver chemistry, and immunoglobulins) and physical exams
    2. EFC17919A/B participants

      • Will have on site visits every 12 weeks (9 visits)

        • Will have a total of 16 visits for OL frexalimab administration (Week 4, 8, 16, 20, 28, 32, 40, 44, 52, 56, 64, 68, 76, 80, 88, and 92)

          • Additionally, there will be up to 3 visits for administration of DB treatment (until results become available and randomization assignment availability).

            • Home nurse services for at home administration may be considered for EFC17919A/B participants after Week 24 administration of OL frexalimab, based on availability.

NOTE: all on-site visits including monthly IMP administrations will include safety labs (biochemistry, hematology liver chemistry, and immunoglobulins) and physical exams.

Studie Overzicht

Toestand

Nog niet aan het werven

Conditie

Interventie / Behandeling

Studietype

Ingrijpend

Inschrijving (Geschat)

2500

Fase

  • Fase 3

Contacten en locaties

In dit gedeelte vindt u de contactgegevens van degenen die het onderzoek uitvoeren en informatie over waar dit onderzoek wordt uitgevoerd.

Studiecontact

  • Naam: Trial Transparency email recommended (Toll free for US & Canada)
  • Telefoonnummer: option 6 800-633-1610
  • E-mail: Contact-US@sanofi.com

Deelname Criteria

Onderzoekers zoeken naar mensen die aan een bepaalde beschrijving voldoen, de zogenaamde geschiktheidscriteria. Enkele voorbeelden van deze criteria zijn iemands algemene gezondheidstoestand of eerdere behandelingen.

Geschiktheidscriteria

Leeftijden die in aanmerking komen voor studie

18 jaar tot 60 jaar (Volwassen)

Accepteert gezonde vrijwilligers

Nee

Geslachten die in aanmerking komen voor studie

Allemaal

Beschrijving

Inclusion Criteria:

- Participants with relapsing multiple sclerosis(RMS) or non-relapsing secondary progressive multiple sclerosis(nrSPMS) who completed, on IMP, the Phase 2 ACT16877 study, or one of the four Phase 3 frexalimab studies in MS indication (EFC17919A and EFC17919B, EFC17504, EFC18098), or planned Phase 2 biomarker ASY22814.

Exclusion Criteria:

  • If IMP discontinuation criteria are met as per guidance
  • The participant is at risk for or has a persistent chronic, active (including fever ≥38°C and clinically unstable), recurring systemic infection or opportunistic infections (eg, PML See Appendix in protocol) as judged by the Investigator.
  • Notably low immunoglobulin G(IgG) levels, defined as a level that is 20% below the LLN, and/or notably low IgM level, defined as a level 10% below the LLN.
  • Participants who developed clinically relevant cardiovascular, hepatic, endocrine, neuropsychiatric or other major systemic disease making implementation of the protocol or interpretation of the study results difficult or that would put the participant at risk by participating in the extension study, as judged by the Investigator.
  • Clinical evidence, suspicion or significant risk for thromboembolic events, as well as myocardial infarction, stroke, and/or antiphospholipid syndrome and any participants requiring antithrombotic treatment.
  • Continued need for/chronic use of a prohibited concomitant medication.
  • Suicidal risk as per C-SSRS: if a participant scores "yes" on items 4 or 5 of the Suicidal Ideation Section, or "yes" on any item of the Suicidal Behavior Section.

The above information is not intended to contain all considerations relevant to a participant's potential participation in a clinical trial.

Studie plan

Dit gedeelte bevat details van het studieplan, inclusief hoe de studie is opgezet en wat de studie meet.

Hoe is de studie opgezet?

Ontwerpdetails

  • Primair doel: Behandeling
  • Toewijzing: Niet-gerandomiseerd
  • Interventioneel model: Parallelle opdracht
  • Masker: Geen (open label)

Wapens en interventies

Deelnemersgroep / Arm
Interventie / Behandeling
Experimenteel: Frexalimab SC (OL)

Participants will be administered frexalimab subcutaneous

Pharmaceutical form:Solution for injection-Route of administration:SC

Andere namen:
  • SAR441344

Pharmaceutical form:Solution for infusion-Route of administration:IV

Andere namen:
  • SAR441344

Route of administration:IV

Experimenteel: Frexalimab IV (OL)

Participants will be administered frexalimab intravenously

Pharmaceutical form:Solution for injection-Route of administration:SC

Andere namen:
  • SAR441344

Pharmaceutical form:Solution for infusion-Route of administration:IV

Andere namen:
  • SAR441344

Route of administration:IV

Experimenteel: Frexalimab (DB)

For EFC17919A/B parent study participants: at Opt-in visit participants will continue to be administered f rexalimab through unblinding visit. Participants will receive placebo tablet once daily until the unblinding visit.

Pharmaceutical form:Solution for injection-Route of administration:SC

Andere namen:
  • SAR441344

Pharmaceutical form:Solution for infusion-Route of administration:IV

Andere namen:
  • SAR441344

Route of administration:IV

Pharmaceutical form:Tablet-Route of administration:Oral

Route of administration:oral

Route of administration:oral

Actieve vergelijker: Teriflunomide (DB)

For EFC17919A/B parent study participants: at Opt-in visit participants will continue to receive teriflunomide tablet. The placebo will be administered to participants at the same infusion rate and duration as for frexalimab from the opt-in visit until availability of results and unblinding.

Route of administration:IV

Route of administration:oral

Route of administration:oral

Pharmaceutical form:Solution for infusion-Route of administration:IV

Pharmaceutical form:Tablet-Route of administration:Oral

Wat meet het onderzoek?

Primaire uitkomstmaten

Uitkomstmaat
Maatregel Beschrijving
Tijdsspanne
Number of participants with Adverse Events(AEs)
Tijdsspanne: up to to approximately 2.5 years since last participant in

Number of participants with Adverse Events(AEs), serious adverse event(SAEs), AEs leading to permanent study intervention discontinuation, adverse event of special interest(AESIs), local tolerability, clinically significant abnormalities in laboratory tests, Columbia-Suicide Severity Rating Scale(C-SSRS)

up to to approximately 2.5 years since last participant in

Secundaire uitkomstmaten

Uitkomstmaat
Maatregel Beschrijving
Tijdsspanne
Participants from EFC17919A, EFC17919B, and EFC17504 studies only: time to onset of 6-month composite confirmed disability worsening(cCDW) for RMS or composite confirmed disability progression(cCDP) for nrSPMS
Tijdsspanne: up to to approximately 2.5 years since last participant in
up to to approximately 2.5 years since last participant in
Time to onset of individual components of the composite, confirmed over 3 months or 6 months EDSS for all prior study participants 9-HPT, T25FW test (participants rolling over from EFC17504, EFC17919A, and EFC17919B)
Tijdsspanne: up to to approximately 2.5 years since last participant in
up to to approximately 2.5 years since last participant in
Progression independent of relapse activity defined as the time to onset of 6-month cCDW
Tijdsspanne: up to to approximately 2.5 years since last participant in

Progression independent of relapse activity defined as the time to onset of 6-month cCDW, defined by either no prior relapse or an onset more than 90 days after the start date of the last Investigator reported relapse (participants rolling over from EFC17919A and EFC17919B)

up to to approximately 2.5 years since last participant in
Number of new and/or enlarging T2-hyperintense lesions per year as detected by MRI
Tijdsspanne: up to to approximately 2.5 years since last participant in
up to to approximately 2.5 years since last participant in
Total number of new GdE T1 lesions per year as detected by MRI
Tijdsspanne: up to to approximately 2.5 years since last participant in
up to to approximately 2.5 years since last participant in
Change from baseline at scheduled visits in total volume of T2-hyperintense lesions as detected by brain MRI
Tijdsspanne: up to to approximately 2.5 years since last participant in
up to to approximately 2.5 years since last participant in
ARR assessed by confirmed protocol defined relapses
Tijdsspanne: up to to approximately 2.5 years since last participant in
up to to approximately 2.5 years since last participant in
antidrug antibodys(ADAs) incidence
Tijdsspanne: up to to approximately 2.5 years since last participant in
up to to approximately 2.5 years since last participant in
Change from baseline in serum immunoglobulin(Ig) levels
Tijdsspanne: up to to approximately 2.5 years since last participant in
up to to approximately 2.5 years since last participant in

Medewerkers en onderzoekers

Hier vindt u mensen en organisaties die betrokken zijn bij dit onderzoek.

Sponsor

Studie record data

Deze datums volgen de voortgang van het onderzoeksdossier en de samenvatting van de ingediende resultaten bij ClinicalTrials.gov. Studieverslagen en gerapporteerde resultaten worden beoordeeld door de National Library of Medicine (NLM) om er zeker van te zijn dat ze voldoen aan specifieke kwaliteitscontrolenormen voordat ze op de openbare website worden geplaatst.

Bestudeer belangrijke data

Studie start (Geschat)

15 februari 2027

Primaire voltooiing (Geschat)

16 mei 2031

Studie voltooiing (Geschat)

16 mei 2031

Studieregistratiedata

Eerst ingediend

3 november 2026

Eerst ingediend dat voldeed aan de QC-criteria

10 november 2026

Eerst geplaatst (Werkelijk)

12 november 2026

Updates van studierecords

Laatste update geplaatst (Werkelijk)

12 november 2026

Laatste update ingediend die voldeed aan QC-criteria

10 november 2026

Laatst geverifieerd

1 november 2026

Meer informatie

Termen gerelateerd aan deze studie

Andere studie-ID-nummers

  • LTS18002
  • 2026-525688-41 (Register-ID: CTIS)

Plan Individuele Deelnemersgegevens (IPD)

Bent u van plan om gegevens van individuele deelnemers (IPD) te delen?

JA

Beschrijving IPD-plan

Qualified researchers may request access to patient level data and related study documents including the clinical study report, study protocol with any amendments, blank case report form, statistical analysis plan, and dataset specifications. Patient level data will be anonymized and study documents will be redacted to protect the privacy of trial participants. Further details on Sanofi's data sharing criteria, eligible studies, and process for requesting access can be found at: https://vivli.org

Informatie over medicijnen en apparaten, studiedocumenten

Bestudeert een door de Amerikaanse FDA gereguleerd geneesmiddel

Ja

Bestudeert een door de Amerikaanse FDA gereguleerd apparaatproduct

Nee

Deze informatie is zonder wijzigingen rechtstreeks van de website clinicaltrials.gov gehaald. Als u verzoeken heeft om uw onderzoeksgegevens te wijzigen, te verwijderen of bij te werken, neem dan contact op met register@clinicaltrials.gov. Zodra er een wijziging wordt doorgevoerd op clinicaltrials.gov, wordt deze ook automatisch bijgewerkt op onze website .