An Interventional, Phase 3 Extension Study to Investigate Long-term Safety and Tolerability of Tolebrutinib in Participants With Relapsing Multiple Sclerosis, Primary Progressive Multiple Sclerosis, or Nonrelapsing Secondary Progressive Multiple Sclerosis

Research Study on Investigational Medication for Multiple Sclerosis

A
Ajay Gupta

Primary Investigator

Enrolling By Invitation
18 years - 100 years
All
Phase 3
2 participants needed
1 Location

Brief description of study

This is a Phase 3 extension, global, multicenter study to assess the long-term safety and tolerability of tolebrutinib in adult participants (aged ≥18 years) with RMS, PPMS, or NRSPMS who were previously enrolled in the Phase 2b LTS (LTS16004) or 1 of the 4 Phase 3 tolebrutinib pivotal trials (GEMINI 1 [EFC16033], GEMINI 2 [EFC16034], HERCULES [EFC16645], or PERSEUS [EFC16035]).
 
THIS STUDY IS ENROLLING BY INVITATION ONLY

Detailed description of study

Participants with relapsing MS from the Phase 2b LTS16004 parent study will continue open-label (OL) tolebrutinib.

All participants from the Phase 3 parent studies (EFC16033, EFC16034, EFC16645, and EFC16035) will learn which treatment they received in the parent study:

  • If from one of the Phase 3 relapsing MS studies and on teriflunomide, an accelerated elimination procedure or a 3-month washout period is required prior to starting OL tolebrutinib. If on teriflunomide, and benefiting and recommended by the Investigator, the participant may opt to continue teriflunomide outside of the LTS17043 study, if clinically appropriate. If on tolebrutinib, the participant will continue tolebrutinib.
  • All participants from one of the Phase 3 progressive MS studies will start OL tolebrutinib.
  • If a participant already started OL tolebrutinib in the Phase 3 parent study this will be continued.
  • RMS participants who are not eligible for OL tolebrutinib per Health Authority and/or ethics committee decisions on the study conduct (ie, partial hold on initiation of tolebrutinib) will continue their parent study treatment assignment as per their randomization from the parent study.

The treatment duration per participant will be approximately 3 years of OL tolebrutinib.

Eligibility of study

You may be eligible for this study if you meet the following criteria:

  • Conditions: Progressive Relapsing Multiple Sclerosis, Relapsing Multiple Sclerosis, Secondary Progressive Multiple Sclerosis
  • Age: 18 years - 100 years
  • Gender: All

Inclusion Criteria:

- Participants with RMS, PPMS, or NRSPMS who completed the Phase 2b LTS (LTS16004) or 1 of the 4 Phase 3 pivotal tolebrutinib trials (EFC16033, EFC16034, EFC16645, EFC16035) on IMP.

OR

- The Phase 2b LTS (LTS16004) or Phase 3 tolebrutinib pivotal trial participants who temporarily discontinued IMP due to a national emergency and completed the trial visits.

ToleDYNAMIC Substudy: Inclusion criteria are those of the main study

Exclusion Criteria:

  • Participants are excluded from the study if any of the following criteria apply:
  • The participant is at risk for or has a persistent chronic, active (including fever higher than 38°C and clinically unstable), or recurring systemic infection, as judged by the Investigator
  • For participants initiating OL tolebrutinib in the LTS17043 study: Participants at risk of developing or having reactivation of hepatitis, ie, results at the unblinding visit (RMS) or opt-in visit (PMS) for serological markers for hepatitis B and C viruses indicating acute or chronic infection
  • Active alcohol use disorder or a history of alcohol or drug abuse within 1 year prior to the opt-in visit
  • Current alcohol intake equal to or exceeding the following at the opt-in visit: more than 2 drinks per day for men and more than 1 drink per day for women
  • Abnormal ECG during the opt-in visit considered in the Investigator's judgment to be clinically significant, such as QTcF >500 msec, in the context of this study.
  • A bleeding disorder, known platelet dysfunction, abnormal platelet count (<100,000/microliter), history of significant bleeding event or other conditions and planned procedures that may predispose the participant to excessive bleeding during the study, as judged by the Investigator.
  • For participants initiating OL tolebrutinib in the LTS17043 study: Confirmed unblinding visit (RMS) or opt-in visit (PMS) alanine aminotransferase (ALT) more than 1.5 × upper limit of normal (ULN) OR aspartate aminotransferase (AST) more than 1.5 × ULN OR alkaline phosphatase more than 2 × ULN (unless caused by non-liver-related disorder or explained by a stable chronic liver disorder) OR total bilirubin more than 1.5 × ULN (unless due to Gilbert syndrome or non-liver-related disorder).
  • Acute liver disease, cirrhosis, chronic liver disease (unless considered stable for more than 6 months).
  • Participants who developed clinically relevant cardiovascular, hepatic, endocrine, neuropsychiatric or other major systemic disease making implementation of the protocol or interpretation of the trial results difficult or that would put the patient at risk by participating in the trial, as judged by the Investigator.
  • The participant is receiving treatment during the study period with drugs not permitted by the study protocol, including potent and moderate inducers of cytochrome P450 (CYP) 3A or potent inhibitors of CYP2C8 hepatic enzymes.

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

ToleDYNAMIC Substudy: Exclusion criteria are those of the main study

This study investigates the long-term safety and tolerability of an investigational medication in adults with different types of multiple sclerosis (MS), including relapsing MS, primary progressive MS, and nonrelapsing secondary progressive MS. Multiple sclerosis is a disease where the immune system attacks the protective covering of nerves, leading to communication problems between the brain and the rest of the body.

Participants will continue or start taking the investigational medication based on their previous study involvement. Some may need to stop other treatments before starting the investigational medication. The study will include procedures like monitoring health through tests and assessments to ensure safety.

  • Who can participate: Adults aged 18 and older who have completed a previous study related to the investigational medication for MS may be eligible, provided they do not have active infections or significant health issues that could interfere with the study.
  • Study details: Participants will continue or start the investigational medication and undergo regular health checks to ensure safety. They must avoid certain other medications during the study.
  • Study timelines: The study will last 3 years.
Updated on 18 Feb 2026. Study ID: FWNC-SANOFI-LTS17043, 23927
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Interested in the study?

This study is accepting only persons who receive care at a certain clinic or doctor or who are part of an invited group. Questions about this study can be directed to the study team listed in the description or contact your doctor to see if you are eligible.

Accepting Referrals by Invitation Only