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Ocrevus Targets Certain T-Cells, Along with B-Cells, in MS Patients, Study Reports

Treatment with a single dose of Ocrevus (ocrelizumab) depleted a subset of immune T-cells within two weeks in patients with relapsing multiple sclerosis (MS) or primary progressive MS (PPMS), according to a study. The study, “Ocrelizumab Depletes CD20+ T Cells in Multiple Sclerosis Patients,” was published in the journal Cells. Autoreactive immune T-cells, which attack the body’s own tissues, have been regarded as the primary mediator of MS; however, this view has been challenged by the effectiveness of therapies targeting immune B-cells that contain the CD20 cell surface protein in reducing disease activity. One such therapy is Genentech’s Ocrevus, an anti-CD20 monoclonal antibody, which was first approved in the U.S. in 2017 for patients with relapsing MS or PPMS. Because CD20 is mainly expressed by B-cell precursors and mature B-cells, Ocrevus is often considered to selectively deplete CD20-containing B-cells. However, CD20 is also expressed by highly activated T-cells with the CD3 protein marker, characterized by the increased production of proinflammatory molecules, or cytokines. These T-cells are found in the blood, cerebrospinal fluid — the liquid surrounding the brain and spinal cord — and chronic brain lesions of MS patients, and show an elevated expression of the CD8 and CD45 markers. Off-label use of rituximab (marketed as Rituxan in the U.S. and MabThera in Europe), a lymphoma and rheumatoid arthritis treatment that also targets CD20, has been associated with the depletion of CD20-containing T-cells in MS patients. Therefore, targeting this T-cell subtype has been hypothesized as an additional mechanism for rituximab’s clinical effectiveness. However, scientists did not know whether Ocrevus, which is different from rituximab in terms of CD20 binding and cell toxicity, also depletes CD20-positive T-cells. To address this unknown, a team from Hannover Medical School in Germany analyzed blood samples of MS patients through a technique called multicolor flow cytometry prior to the first dose of Ocrevus and after two weeks, immediately before the second dose. They intended to evaluate the characteristics of the patients’ peripheral blood mononuclear cells, which include T-cells, B-cells, monocytes, and macrophages. A total of 21 patients (13 women) were included, with a median age of 43 years (range 22-65 years). Of the participants, 17 had the relapsing form of the disease for a median of 14.6 years, while four had PPMS for a median of 5.6 years. The analysis found T-cells containing CD20 and CD3 in all patients. These cells accounted for 2.4% of all CD45-expressing lymphocytes — white blood cells that include T- and B-cells — and for a significant proportion (18.4%) of all CD20 cells. Evaluation of the cells’ fluorescence intensity revealed that CD20 levels were significantly lower on T-cells than on B-cells also expressing this marker. Treatment with one dose of Ocrevus substantially lowered the levels of CD20-positive T- and B-cells within two weeks, reflected by a frequency of 0.04% and an absolute cell count decrease from 224.9 to 0.57/microliter. “Our results demonstrate that treatment with [Ocrevus] does not exclusively target B-cells, but also CD20+ T-cells, which account for a substantial amount of CD20-expressing cells,” the researchers wrote. “These findings suggest that CD20+ T-cells might play a pivotal role in the pathogenesis of MS, and we speculate that depletion of CD3+CD20+ cells by anti-CD20 monoclonal antibodies might contribute to the efficacy of anti-CD20 therapy,” they added. However, they also emphasized that the findings need to be confirmed in studies with larger groups of MS patients.

Tecfidera Effective in East Asian RRMS Patients, Phase 3 Trial Shows

Tecfidera (dimethyl fumarate) demonstrated strong efficacy in Japanese and other East Asian patients with relapsing-remitting multiple sclerosis (RRMS), a Phase 3 clinical trial shows. These results are consistent with previous clinical trials, which included mostly white MS patients, and show that Tecfidera can also be effective across various other patient demographics. Findings of the trial were reported in the study, “A randomized placebo-controlled trial of delayed-release dimethyl fumarate in patients with relapsing-remitting multiple sclerosis from East Asia and other countries,” in the journal BMC Neurology. Tecfidera, a delayed-release dimethyl fumarate capsule, marketed by Biogen, is an oral therapy approved in many parts of the world for the treatment of RRMS. In previous Phase 3 clinical studies, DEFINE (NCT00420212), and CONFIRM (NCT00451451), Tecfidera showed substantial effectiveness on clinical and neuroradiological measures in RRMS patients. The study participants were predominantly white (79% in DEFINE and 84% in CONFIRM), and there were 10% or fewer East Asian patients. In general, very little data is available on Tecfidera's effectiveness in East Asian MS patients. In this APEX Part 1 (NCT01838668) trial, researchers from the Kansai Medical University in Japan and Biogen evaluated the safety and efficacy of Tecfidera over 24 weeks (six months) in the treatment of RRMS patients from East Asia and other countries. Participants with active MS between the ages of 18 and 55, with ethnic origins in Japan, South Korea, or Taiwan were included. To compare East Asian and white MS patients, study enrollment was expanded to patients from Eastern Europe (Czech Republic and Poland). In all, the six-month, double-blind, placebo-controlled study recruited 225 patients, 142 of whom were East Asian (63.4%). It was completed by 213 participants. Patients were randomly assigned to receive Tecfidera, (240 mg, twice daily) or a matching placebo for six months. They were assessed at the beginning of the study, at three months, and again at six months. They underwent MRI (magnetic resonance imaging) scans for neurological examination, in addition to routine health checks. The primary objective of the study was the total number of new inflammatory lesions on brain MRI scans from three to six months. Secondary goals included the number of specific new, or newly enlarging T2 hyperintense lesions — lesions reflective of damage to nerve cell connections — from the beginning of the study to six months. Tertiary goals included standard safety measurements, and annualized relapse rate over six months. “We chose radiological measures to serve as primary and secondary endpoints, due to the ability of MRI to detect lesions that might not produce clinical manifestations in the short-term,” the researchers wrote. Results showed that Tecfidera treatment significantly reduced (84%) the total number of new MRI lesions from weeks 12 to 24 (primary objective), compared with placebo — specifically by 85% in the Japanese subgroup, 81% in the total East Asian subgroup, and 87% in the Eastern European subgroup. Regarding the trial's secondary objective, the total number of new MRI lesions from the beginning of the study up to six months was reduced by 75% in the Tecfidera group (78% in the Japanese, 76% in the East Asian, and 73% in the Eastern European subgroups), and the mean number of new/newly enlarging T2 hyperintense lesions was reduced by 63% in the Japanese, and 58% in the East Asian subgroups, compared with placebo. Most patients reported one or more adverse events (77% in the placebo group and 86% in the Tecfidera group). Most adverse events were mild or moderate in severity, and the ones affecting patients taking Tecfidera either related mainly to flushing symptoms or to gastrointestinal problems. The team concluded that the "results suggest that the strong efficacy and favorable benefit-risk profile of [Tecfidera] extends to Japanese and other East Asian patients with MS." The second part of the ongoing clinical trial, APEX Part 2, is an open-label extension trial — where both the researchers and participants know which treatment they are getting — designed to further examine the long-term safety and tolerability of Tecfidera in East Asian MS patients.

WeHealth, PathMaker Collaborating to Develop MyoRegulator as Noninvasive Treatment for Spasticity

WeHealth by Servier and PathMaker Neurosystems have established a new partnership to develop and commercialize the first neuromodulation technology for noninvasive treatment of spasticity, the companies announced. The agreement establishes an exclusive worldwide distribution arrangement, except for the U.S. and Japan, for PathMaker’s MyoRegulator. The MyoRegulator uses two pairs of…

Mavenclad Approved for Reimbursement as RRMS Treatment in Australia

Australia was one of the first countries to approve the use of Mavenclad (cladribine tablets, 10 mg) to treat patients with highly active relapsing-remitting multiple sclerosis (RRMS). Now, the country’s government has taken another step to ensure this 20-day course treatment is available to the largest number possible of people affected by the disease. Australia’s Prime Minister, Hon. Scott Morrison MP, announced that Merck KGaA’s therapy was included on the Pharmaceutical Benefits Scheme (PBS) listing effective Jan. 1. This will make Mavenclad affordable for about 6,200 patients each year who are already accessing PBS-subsidized medicines for MS. (Of note, Merck KGaA is known as EMD Serono in the U.S. and Canada.) This was made possible by the joint effort of MS Australia, MS Research Australia, clinicians and members of the MS community who, after successive submissions, achieved a positive recommendation by the Pharmaceutical Benefits Advisory Committee (PBAC) to list Mavenclad on PBS as a treatment for RRMS. Australia's government will cover almost all costs of Mavenclad, which will mean that patients will have to pay only $40.30 per prescription, or $6.50 for concessional patients. “Thanks to our strong economic management, we’ve ensured that every new, essential medicine recommended for listing by the Pharmaceutical Benefits Advisory Committee receives government subsidy to make it affordable for all Australians,” the Prime Minister said in a press release. Mavenclad was developed to target immune T- and B-cells that trigger relapsing MS without suppressing the entire immune system. To be taken for a maximum of 20 days over two years, the oral drug has shown it helps MS patients remain relapse-free for up to four years, while supporting the “reset” of the immune system. Australia's regulatory agency decided to approve Mavenclad based on the findings of a number of clinical trials, including the Phase 3 CLARITY (NCT00213135), CLARITY EXTENSION (NCT00641537), and ORACLE-MS (NCT00725985) studies, as well as the Phase 2 trial ONWARD study (NCT00436826), and the long-term PREMIERE (NCT01013350) trials. These clinical studies involved more than 2,700 RRMS patients, some of whom were followed for more than 10 years. Overall, the trials showed that Mavenclad significantly reduced relapse rates, disability progression, and brain atrophy. Doctors recommend the therapy for patients who failed to respond to, or are unable to tolerate, other MS treatments.

Acrolein Eyed as Potential Biomarker of MS, Preliminary Study Finds

A product called acrolein, which is naturally excreted by the body and possible to measure in urine and blood, may be a potential biomarker to help diagnose and evaluate disease activity in people with multiple sclerosis (MS), according to preliminary research in animal models and humans. Researchers are investigating whether acrolein…

Top 10 Multiple Sclerosis Stories of 2018

Multiple Sclerosis News Today brought you daily coverage of key findings, treatment developments, and clinical trials related to multiple sclerosis (MS) throughout 2018. We look forward to reporting more news to patients, family members, and caregivers dealing with MS during 2019. Here are the top 10 most-read articles of…

Stem Cell Transplant Lessens Disability and Relapses in RRMS Patients, Phase 2 Trial Shows

Treatment with autologous hematopoietic stem cell transplant (aHSCT) led to a sustained decrease in disability and almost no clinical relapses in patients with relapsing-remitting multiple sclerosis (RRMS) who had failed to respond to prior immunosuppressive therapies, an Australian Phase 2 trial shows. Trial findings were published in the study, “Prospective phase…

Study Links Food Allergies and Increased MS Disease Activity

Multiple sclerosis (MS) patients who reported food allergies showed a 27 percent higher cumulative rate of flare-ups over the course of their disease, and more than twice the likelihood of having active inflammatory lesions, a new study shows. The study, “Food Allergies are Associated with Increased Disease Activity…