Data from a long-term open-label extension study from the first Phase 3 Fampridine-SR trial, known as MS-F203, showed that 24.9% of extension study participants with multiple sclerosis (MS) met the criteria as Extension Timed Walk Responders (ETWRs) after one year of treatment and demonstrated improved walking speed over a two year period. In addition, the safety profile of Fampridine-SR observed over two years in this study was consistent with previous placebo-controlled trials. The data were presented today at the 25th Congress of the European Committee for Multiple Sclerosis (ECTRIMS) in Düsseldorf, Germany.
“Long-term data for Fampridine-SR are important because this medicine is potentially a chronic therapy for people with multiple sclerosis,” said Andrew Goodman, M.D., Director of the Multiple Sclerosis Center at the University of Rochester, who presented the data. “The data suggest that Fampridine-SR can produce a sustained, clinically meaningful improvement in walking speed for a subset of people with MS over a two year period.”
Trial Design
In the 14-week placebo-controlled portion of the MS-F203 study, 34.8% of subjects were defined as Timed Walk Responders in the Fampridine-SR group compared to 8.3% of subjects in the Placebo group. Following the placebo-controlled study, 269 of the 283 participants who completed the study, including those defined as Timed Walk Responders, Non-Responders and participants from the Placebo group, enrolled in the open-label extension study. All participants in the extension study were treated with Fampridine-SR at 10 mg twice daily, and assessed in the clinic at 2, 14, 26, 52, 78 and 104 weeks.