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Background: The double-blind TERIKIDS study demonstrated the efficacy and safety of teriflunomide., Objective: To evaluate the efficacy, safety, and tolerability of continuous teriflunomide treatment in the TERIKIDS open-label extension., Methods: In the double-blind period, children with relapsing MS were randomized to placebo or teriflunomide (14 mg adult-equivalent dose) for ⩽ 96 weeks. Participants received teriflunomide for ⩽ 192 weeks post-randomization in the open-label extension., Results: The mean age at screening was 14.6 years. For teriflunomide/teriflunomide versus placebo/teriflunomide, estimated clinical relapse risk was reduced by 38% (hazard ratio (HR) 0.62; 95% confidence interval (CI) 0.39-0.98; p  = 0.11) and numbers of gadolinium-enhancing T1 and new/enlarging T2 lesions were reduced by 43% (relative risk (RR) 0.570; 95% CI 0.33-0.98; p  = 0.043) and 49% (RR 0.511; 95% CI 0.34-0.76; p  = 0.001), respectively, in the combined double-blind and open-label periods. There was a trend toward reduced risk of 24-week sustained disability progression for teriflunomide/teriflunomide versus placebo/teriflunomide (HR 0.47; 95% CI 0.23-0.96). During the open-label extension, incidences of safety-related discontinuations were 4.0% (teriflunomide/teriflunomide) and 13.5% (placebo/teriflunomide), including two children who developed pancreatitis in the teriflunomide/teriflunomide group., Conclusion: Teriflunomide reduced the long-term risk of focal inflammatory activity, with generally manageable tolerability and no new safety signals. Further evidence would strengthen clinical efficacy findings.ClinicalTrials.gov: NCT02201108., Competing Interests: Declaration of Conflicting InterestsThe author(s) declared the following potential conflicts of interest with respect to the research, authorship, and/or publication of this article: Kumaran Deiva: consulting fees and travel grants from Biogen, Merck, Novartis Pharmaceuticals, Roche, and Sanofi. Tanuja Chitnis: consulting fees from Biogen, Novartis Pharmaceuticals, Roche Genentech, and Sanofi; research support from National Institutes of Health, National MS Society, U.S. Department of Defense, EMD Serono, I-Mab Biopharma, Mallinckrodt ARD, Novartis Pharmaceuticals, Octave Bioscience, Genentech, and Tiziana Life Sciences. Brenda Banwell: consulting fees from Novartis Pharmaceuticals, Roche, Sanofi, and UCB; non-remunerated advisory input for Biogen, EMD Serono, Novartis Pharmaceuticals, and Teva. Ludwig Kappos: Dr Kappos’ institution (University Hospital Basel) has received in the past 3 years and used exclusively research support, steering committees, advisory boards, and consultancy fees from AbbVie, Actelion, AurigaVision AG, Biogen, Celgene, Desitin, Eli Lilly, EMD Serono, Genentech, GlaxoSmithKline, Janssen, Japan Tobacco, Merck, Minoryx, Novartis, Roche, Sanofi, Santhera, Senda, Shionogi, Teva, and Wellmera; speaker fees from Celgene, Janssen, Merck, Novartis, and Roche; support for educational activities from Biogen, Desitin, Novartis, Sanofi, and Teva; license fees for Neurostatus products and grants from European Union, Innosuisse, Novartis, Roche Research Foundation, Swiss MS Society, and Swiss National Research Foundation. Douglas L Arnold: consulting fees from Alexion, Biogen, Celgene, Eli Lilly and Company, EMD Serono, Frequency Therapeutics, Genentech, Merck, Novartis, Roche, Sanofi, and Shionogi; equity interest in NeuroRx. Kivilcim Gücüyener: no competing interests. Stephane Saubadu: employee of Sanofi, with ownership interest. Wenruo Hu: employee of Sanofi, with ownership interest. Myriam Benamor: employee of Sanofi, with ownership interest. Annaig Le-Halpere: employee of Sanofi, with ownership interest. Philippe Truffinet: employee of Sanofi, with ownership interest. Marc Tardieu: research support from Novartis Pharmaceuticals and Sanofi.

Background: The CD40-CD40L costimulatory pathway regulates adaptive and innate immune responses and has been implicated in the pathogenesis of multiple sclerosis. Frexalimab is a second-generation anti-CD40L monoclonal antibody being evaluated for the treatment of multiple sclerosis., Methods: In this phase 2, double-blind, randomized trial, we assigned, in a 4:4:1:1 ratio, participants with relapsing multiple sclerosis to receive 1200 mg of frexalimab administered intravenously every 4 weeks (with an 1800-mg loading dose), 300 mg of frexalimab administered subcutaneously every 2 weeks (with a 600-mg loading dose), or the matching placebos for each active treatment. The primary end point was the number of new gadolinium-enhancing T1-weighted lesions seen on magnetic resonance imaging at week 12 relative to week 8. Secondary end points included the number of new or enlarging T2-weighted lesions at week 12 relative to week 8, the total number of gadolinium-enhancing T1-weighted lesions at week 12, and safety. After 12 weeks, all the participants could receive open-label frexalimab., Results: Of 166 participants screened, 129 were assigned to a trial group; 125 participants (97%) completed the 12-week double-blind period. The mean age of the participants was 36.6 years, 66% were women, and 30% had gadolinium-enhancing lesions at baseline. At week 12, the adjusted mean number of new gadolinium-enhancing T1-weighted lesions was 0.2 (95% confidence interval [CI], 0.1 to 0.4) in the group that received 1200 mg of frexalimab intravenously and 0.3 (95% CI, 0.1 to 0.6) in the group that received 300 mg of frexalimab subcutaneously, as compared with 1.4 (95% CI, 0.6 to 3.0) in the pooled placebo group. The rate ratios as compared with placebo were 0.11 (95% CI, 0.03 to 0.38) in the 1200-mg group and 0.21 (95% CI, 0.08 to 0.56) in the 300-mg group. Results for the secondary imaging end points were generally in the same direction as those for the primary analysis. The most common adverse events were coronavirus disease 2019 and headaches., Conclusions: In a phase 2 trial involving participants with multiple sclerosis, inhibition of CD40L with frexalimab had an effect that generally favored a greater reduction in the number of new gadolinium-enhancing T1-weighted lesions at week 12 as compared with placebo. Larger and longer trials are needed to determine the long-term efficacy and safety of frexalimab in persons with multiple sclerosis. (Funded by Sanofi; ClinicalTrials.gov number, NCT04879628.)., (Copyright © 2024 Massachusetts Medical Society.)