FDA, Catalyst Agree on Trial Protocol for LEMS Therapy

FDA and Catalyst Pharmaceuticals have reached an agreement under a special protocol assessment for the protocol design, clinical endpoints, and statistical analysis approach in an upcoming Phase 3 study evaluating Firdapse (amifampridine phosphate) for the symptomatic treatment of Lambert-Eaton myasthenic syndrome. Catalyst intends to conduct its second Phase 3 trial (designated as LMS-003) at two clinical trial sites in the U.S. The double-blind, placebo-controlled withdrawal trial will include 28 subjects, and will have the same co-primary endpoints as Catalyst’s first Phase 3 trial evaluating Firdapse, according to the company, adding that it will be a parallel design and not a cross-over design. Additionally, the agency has agreed to allow Catalyst to enroll patients from its expanded access program as study subjects.

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