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We evaluated the effect of DMTs on Covid‐19 severity in patients with MS, with a pooled‐analysis of two large cohorts from Italy and France. The association of baseline characteristics and DMTs with Covid‐19 severity was assessed by multivariate ordinal‐logistic models and pooled by a fixed‐effect meta‐analysis. 1066 patients with MS from Italy and 721 from France were included. In the multivariate model, anti‐CD20 therapies were significantly associated (OR = 2.05, 95%CI = 1.39–3.02, p < 0.001) with Covid‐19 severity, whereas interferon indicated a decreased risk (OR = 0.42, 95%CI = 0.18–0.99, p = 0.047). This pooled‐analysis confirms an increased risk of severe Covid‐19 in patients on anti‐CD20 therapies and supports the protective role of interferon.

BackgroundTarget trial emulation (TTE) offers a formal framework for causal inference using observational data, but its validity must be evaluated in each research domain by replicating randomised clinical trials (RCTs). We aimed to replicate eight RCTs evaluating the efficacy of disease-modifying therapies (DMTs) in multiple sclerosis (MS) using French registry data.MethodsThis multicentre, retrospective, observational study was conducted using data extracted in December 2023 from the Observatoire Français de la Sclérose en Plaques (OFSEP) database. For each emulated trial, patients were included when they initiated one of the DMT evaluated in the corresponding RCT and met its inclusion criteria. Clinical outcomes were the annualised relapse rate and 3-month confirmed Expanded Disability Status Scale progression. Radiological outcomes were new/enlarged T2-lesions and new gadolinium-enhanced T1-lesions on a brain MRI. A targeted maximum likelihood estimator was used to estimate the treatment effect adjusted for confounding factors between groups and corrected for censoring and missing outcome assessment.Results14 111 patients were included in eight emulated trials: ASSESS (fingolimod vs glatiramer acetate), BEYOND (interferon beta vs glatiramer acetate), CONFIRM (dimethyl fumarate (DMF) vs glatiramer acetate), OPERA (ocrelizumab vs interferon beta), REGARD (interferon beta vs glatiramer acetate), RIFUND-MS (rituximab vs DMF), TENERE (teriflunomide vs interferon beta) and TRANSFORMS (fingolimod vs interferon beta). Treatment effects estimated in emulated trials were concordant with RCT findings in seven of eight trials for relapse rate, and in all six trials assessing disability progression. Radiological outcomes were more challenging to replicate; concordance was achieved in three of five trials for new T2-lesions, and one of four trials for new gadolinium-enhanced T1-lesions.ConclusionThe combined use of a TTE methodology and high-quality registry data is a valid tool to evaluate treatment effectiveness in MS.

Atraumatic needles are proposed to lower complication rates after lumbar puncture (LP). Only a minority of physicians use such needles. Here we aimed to assess the impact of specific training in LP during clinical clerkship on the proportion of medical students using atraumatic needles. We performed a case-control study comparing medical students undergoing clinical clerkship and students undergoing specific LP training. The 176 students of a class underwent training in LP just before beginning their clinical rotations. This training consisted of 45 minutes of theoretical training and a 90-minute practical session with a dummy. Twenty students were selected from the class at random, and their competence was assessed with a multiple choice questionnaire (MCQ) and an objective structured clinical examination (OSCE), nine months after the specific training. These 20 cases were compared with 20 students randomly selected from a class of 180 students who had not undergone specific training in LP and were at the end of their clinical clerkship. We found that 60% of the students with specific training and 25% of those with classic clinical training used an atraumatic needle during the OSCE (p = 0.025). The mean MCQ (/100) scores obtained were 57±15 and 60±15 for the specific and classic training groups, respectively (p = 0.35). Overall OSCE score was similar in the two groups (63.5±9.3 vs. 65.8±9.3; p = 0.20). Very few practicing physicians use atraumatic needles, which limits the teaching of their use to medical students. Specific training durably increases the use of appropriate needles.

Neuromyelitis optica (NMO) is a life-threatening disease without any validated treatment strategy. Recent retrospective studies suggested the efficacy of B cell depletion without any distinction between first-line or rescue therapy. To assess whether rituximab as first-line therapy in NMO could efficiently control the occurrence of relapses. A retrospective analysis of NMO patients from NOMADMUS network found 32 patients receiving rituximab as first-line therapy. Main measures were number of relapse-free patients, changes in the annualized relapse rate (ARR), and changes in the EDSS. Tolerance was reported. At baseline, NMO patients were 45 ± 12.1 years old, with a sex ratio of 5.4, and 87.5 % of them had AQP4 antibodies. The median disease duration was 6.5 months (1–410), the mean EDSS was 5.8 ± 2.4 and the mean ARR was 3.8 ± 4.3. After rituximab with a mean follow-up of 28.7 ± 21 months, twenty-seven patients (84.3 %) were relapse free. Patients presented a 97 % decrease of ARR ( p  = 0.00001). EDSS decreased significantly to 3.9 ± 2.6 ( p  = 0.01). No relevant side effect was noted. New retrospective data are presented on RTX use in NMOSD. When used as first-line therapy RTX is highly effective and well tolerated.

Studies of cancer prevalence have produced conflicting results concerning the relative risk of overall and specific sub-types of cancer in patients with multiple sclerosis (MS). Contemporary controls and information on tobacco use and alcohol consumption are generally missing from previous studies. To evaluate lifetime cancer prevalence in a large cohort of MS patients relative to appropriate controls. We conducted a case-control study, using a postal survey of a cohort of MS patients. Of the 1574 questionnaires sent, 1107 could be used for statistical analysis. Data from 1568 controls were prospectively collected using the same self-administered survey among consecutive out-patients in a single neurology department. Propensity scores matched on age, gender, and history of smoking and alcohol consumption were calculated. Among the MS patients, 7.32% had ever presented with a cancer, whereas 12,63% of the controls had, leading to a bootstrap matched odds ratio (OR) of 0.63; 95% CI 0.57-0.70. Although only exploratory, the use of DMT (immunomodulators or immunosupressants) did not appear to increase this risk (p = 0.42). The disease course also did not affect cancer prevalence. MS was associated with a reduced overall cancer risk.

Background Chronic visual loss is a disabling feature in patients with multiple sclerosis (MS). It was recently shown that MD1003 (high-dose pharmaceutical-grade biotin or hdPB) may improve disability in patients with progressive MS. Objective The aim of this study was to evaluate whether MD1003 improves vision compared with placebo in MS patients with chronic visual loss. Methods The MS-ON was a 6-month, randomized, double-blind, placebo-controlled study with a 6-month open-label extension phase. Adult patients with MS-related chronic visual loss of at least one eye [visual acuity (VA) below 0.5 decimal chart] were randomized 2:1 to oral MD1003 300 mg/day or placebo. The selected eye had to show worsening of VA within the past 3 years following either acute optic neuritis (AON) or slowly progressive optic neuropathy (PON). The primary endpoint was the mean change from baseline to month 6 in VA measured in logarithm of the minimum angle of resolution (logMAR) at 100% contrast of the selected eye. Visually evoked potentials, visual field, retinal nerve fiber layer (RNFL) thickness, and health outcomes were also assessed. Results Ninety-three patients received MD1003 ( n  = 65) or placebo ( n  = 28). The study did not meet its primary endpoint, as the mean change in the primary endpoint was nonsignificantly larger ( p  = 0.66) with MD1003 (− 0.061 logMAR, + 3.1 letters) than with placebo (− 0.036 logMAR, + 1.8 letters). Pre-planned subgroup analyses showed that 100% contrast VA improved by a mean of + 2.8 letters (− 0.058 logMAR) with MD1003 and worsened by − 1.5 letters (+ 0.029 logMAR) with placebo ( p  = 0.45) in the subgroup of patients with PON. MD1003-treated patients also had nonsignificant improvement in logMAR at 5% contrast and in RNFL thickness and health outcome scores when compared with placebo-treated patients. There was no superiority of MD1003 vs placebo in patients with AON. The safety profile of MD1003 was similar to that of placebo. Conclusions MD1003 did not significantly improve VA compared with placebo in patients with MS experiencing chronic visual loss. An interesting trend favoring MD1003 was observed in the subgroup of patients with PON. Treatment was overall well tolerated. Trial registration EudraCT identifier 2013-002112-27. ClinicalTrials.gov Identifier: NCT02220244 Funding MedDay Pharmaceuticals.

Background Treatment options for patients suffering from progressive forms of multiple sclerosis (MS) remain inadequate. Mast cells actively participate in the pathogenesis of MS, in part because they release large amounts of various mediators that sustain the inflammatory network. Masitinib, a selective oral tyrosine kinase inhibitor, effectively inhibits the survival, migration and activity of mast cells. This exploratory study assessed the safety and clinical benefit of masitinib in the treatment of primary progressive MS (PPMS) or relapse-free secondary progressive MS (rfSPMS). Methods Multicenter, randomized, placebo-controlled, proof-of-concept trial. Masitinib was administered orally at 3 to 6 mg/kg/day for at least 12 months, with dose adjustment permitted in event of insufficient response with no toxicity. The primary response endpoint was the change relative to baseline in the multiple sclerosis functional composite score (MSFC). Clinical response was defined as an increase in MSFC score relative to baseline of > 100%. Results Thirty-five patients were randomized to receive masitinib (N = 27) or placebo (N = 8). Masitinib was relatively well tolerated with the most common adverse events being asthenia, rash, nausea, edema, and diarrhea. The overall frequency of adverse events was similar to the placebo group, however, a higher incidence of severe and serious events was associated with masitinib treatment. Masitinib appeared to have a positive effect on MS-related impairment for PPMS and rfSPMS patients, as evidenced by an improvement in MSFC scores relative to baseline, compared with a worsening MSFC score in patients receiving placebo; +103% ± 189 versus -60% ± 190 at month-12, respectively. This positive, albeit non-statistically significant response was observed as early as month-3 and sustained through to month-18, with similar trends seen in the PPMS and rfSPMS subpopulations. A total of 7/22 (32%) assessable masitinib patients reported clinical response following 12 months of treatment (according to the modified intent-to-treat population, observed cases) compared with none in the placebo group. The Expanded Disability Status Scale remained stable for both treatment groups. Conclusion These data suggest that masitinib is of therapeutic benefit to PPMS and rfSPMS patients and could therefore represent an innovative avenue of treatment for this disease. This exploratory trial provides evidence that may support a larger placebo-controlled investigation.

Recent studies in multiple sclerosis (MS) showed longer survival times from clinical onset than older hospital-based series. However estimated median time ranges widely, from 24 to 45 years, which makes huge difference for patients as this neurological disease mainly starts around age 20 to 40. Precise and up-to-date reference data about mortality in MS are crucial for patients and neurologists, but unavailable yet in France. Estimate survival in MS patients and compare mortality with that of the French general population. We conducted a multicenter observational study involving clinical longitudinal data from 30,413 eligible patients, linked to the national deaths register. Inclusion criteria were definite MS diagnosis and clinical onset prior to January, 1st 2009 in order to get a minimum of 1-year disease duration. After removing between-center duplicates and applying inclusion criteria, the final population comprised 27,603 MS patients (F/M sex ratio 2.5, mean age at onset 33.0 years, 85.5% relapsing onset). During the follow-up period (mean 15.2 +/- 10.3 years), 1569 deaths (5.7%) were identified; half related to MS. Death rates were significantly higher in men, patients with later clinical onset, and in progressive MS. Overall excess mortality compared with the general population was moderate (Standardized Mortality Ratio 1.48, 95% confidence interval [1.41-1.55]), but increased considerably after 20 years of disease (2.20 [2.10-2.31]). This study revealed a moderate decrease in life expectancy in MS patients, and showed that the risk of dying is strongly correlated to disease duration and disability, highlighting the need for early actions that can slow disability progression.

We compared SimoaTM and EllaTM immunoassays to assess serum neurofilament‐light chain levels in 203 multiple sclerosis patients from the OFSEP HD study. There was a strong correlation (ρ = 0.86, p < 0.0001) between both platforms. The EllaTM instrument overestimated values by 17%, but as the data were linear (p = 0.57), it was possible to apply a correction factor to EllaTM results. As for SimoaTM, serum neurofilament‐light chain levels measured by EllaTM were correlated with age and EDSS and were significantly higher in active multiple sclerosis, suggesting that these assays are equivalent and can be used in routine clinical practice.

Background Access to healthcare and socioeconomic deprivation are intricately linked. No studies have been led to measure the effect of healthcare accessibility on mortality in patients with MS so far. The objective was to examine the influence of travel time to the expert MS centre and of the accessibility to primary healthcare services on excess mortality in MS. Methods A retrospective observational cohort study recruited patients from 18 French MS expert centres, with an onset of MS between 1960 and 2015 and a follow-up of up to 30 years. Primary health facility accessibility was measured by the Spatial aCcessibility multiscAlar index. Specialist care accessibility was measured by road travel time to the expert MS centre. Excess death rates (EDR) and excess hazard ratios were studied using additive excess hazard models with multidimensional penalised splines. Results The study included 33,697 patients. Patients with relapsing-onset MS (R-MS) with a travel time of 40 min had the lowest EDR (Men: 1.2 deaths per 100 person-years (95%CI [0.8;1.8]), women: 0.8 deaths per 100 person-years 95%CI[0.6;1.2]), lower than patients who lived further from the centre. No effect of primary care access was found for patients with R-MS, and no effect of accessibility to primary or specialised care was found for patients with primary progressive MS. Conclusion This study reveals the impact of travel time to neurologists on excess mortality in patients with R-MS in France. This distance bias association highlights the importance of preventing a potential selection of patients followed in MS expert centres.