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…

Biogen announced the start of a global Phase 3b clinical trial to evaluate the efficacy and safety of extended interval dosing (EID) with Tysabri (natalizumab) in patients with relapsing-remitting multiple sclerosis (RRMS). Results of the six-week dosing interval will be compared with the approved standard interval dosing…

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…

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…

A mutation in a mouse model of the John Cunningham (JC) virus, which causes progressive multifocal leukoencephalopathy (PML), allows the virus to evade the host immune responses in people with multiple sclerosis (MS), according to a study into the mechanisms of PML. Infection with the JC virus most often passes unnoticed in healthy…

Multiple sclerosis (MS) patients who are prescribed Tysabri have an increased risk to develop the rare, often fatal infection of the brain called progressive multifocal leukoencephalopathy (PML), according to a recent study. PML is caused by a common virus that infects blood cells and can be mobilized by popular RRMS drug Natalizumab,…