Mutations in the John Cunningham virus may serve as an early predictor for a rare brain infection in multiple sclerosis patients receiving Tysabri (natalizumab), a study suggests. However, more research is required to investigate the specific mutations in the viral VP1 gene, and validate the risk of the…

Editor’s note: “Need to Know” is a series inspired by common forum questions and comments from readers. Have a comment or question about MS? Visit our forum. This week’s question is inspired by the forum topic “Does PML worry you?” from April 18. The world of multiple sclerosis (MS)…

Immune system activation induced by filgrastim may be beneficial for patients with progressive multifocal leukoencephalopathy associated with the use of Tysabri (natalizumab), without worsening multiple sclerosis (MS) progression, a study says. The study with that finding, “Treatment of natalizumab‐associated PML with filgrastim,” was published in…

At the 2019 annual meeting of the American Academy of Neurology (AAN), Multiple Sclerosis News Today sat down with Bernd Kieseier, MD, global head of multiple sclerosis at Biogen, to discuss the company’s portfolio, latest data, and therapeutic development plans in the field of multiple sclerosis (MS). Kieseier said…

New data suggests that treatment with Tysabri (natalizumab) in an extended interval dosing regimen is associated with a significantly lower risk of progressive multifocal leukoencephalopathy (PML) in patients with multiple sclerosis (MS), compared with the standard interval dosing. The data was presented by Lana Zhovtis Ryerson, MD, on May 7 at the 2019 …

Stable patients with multiple sclerosis (MS) who transition from Tysabri (natalizumab) treatment to Aubagio (teriflunomide) have a lower relapse risk, a new study shows. The study, “Reducing return of disease activity in patients with relapsing multiple sclerosis transitioned from natalizumab to teriflunomide: 12-month interim results of teriflunomide therapy,”…

One of the many disease-modifying therapies (DMTs) that I’ve been on over the many years of my treatment for MS is Tysabri (natalizumab). It worked well, holding the progression of my MS at bay for the several years that I received the infusions. I’d probably still be on it…

A recent study has found Tysabri (natalizumab) treatment for two years to be efficient and safe in Japanese patients with relapsing-remitting multiple sclerosis (RRMS). The study, “Safety and Efficacy of Natalizumab in Japanese Patients with Relapsing-Remitting Multiple Sclerosis: Open-Label Extension Study of a Phase 2 Trial,” appeared in the journal…

Progressive multifocal leukoencephalopathy (PML) in multiple sclerosis (MS) patients treated with Tysabri (natalizumab) is linked to better outcomes if the condition does not give rise to actual symptoms and is diagnosed early. Limited brain lesions and more protective immune responses were also seen in patients who fared better, but researchers…

Although Tysabri (natalizumab) is a highly effective in treating patients with relapsing-remitting multiple sclerosis (RRMS), some may develop progressive multifocal leukoencephalopathy (PML). According to a new study, this occurs because Tysabri impairs immune surveillance in the central nervous system and reactivates the latent John Cunningham polyomavirus (JCV). The study, “Natalizumab Affects…

In a recent study of more than 1,200 patients with multiple sclerosis (MS), a research team reported that treatment with the drug natalizumab (Tysabri) could lead to a tenfold increase in the levels of blood antibodies associated with a virus causing a rare but severe brain disease known as progressive multifocal…