Protalex, Inc. announced preliminary findings that its lead drug candidate PRTX-100 reduced disease activity in a second, confirmatory mouse study of myasthenia gravis (MG), an autoimmune disorder mediated by anti-self antibodies that react with the neuromuscular junction. The study was conducted by the Laboratory for Myasthenia Gravis Research at George Washington University. The study demonstrated potential clinical benefits of PRTX-100 in mice with established MG symptoms. Treatment with PRTX-100 preserved grip strength and decreased disease activity scores relative to control animals. MG is an autoimmune disorder caused by anti-self antibodies that react with the neuromuscular junction, causing muscle weakness and fatigability. MG remains underdiagnosed in the U.S. and has an estimated incidence of 14 to 20 per 100,000 population, meaning there are approximately 36,000 to 60,000 cases in the U.S.1 Current treatments, which include corticosteroids and immunosuppressant agents, are not optimal as they can cause severe adverse events. Neurological autoimmune disorders in general lack efficacious treatments without adverse side effects. PRTX-100, a new-generation immunomodulatory therapy, is a highly purified form of SpA, an immunomodulatory protein known to modify aspects of the human immune system. PRTX-100 has the ability, at very low concentrations, to bind to human B-lymphocytes and macrophages and to modulate immune processes. The safety, tolerability and pharmacokinetics of PRTX-100 have been characterized in eight human clinical studies (seven completed, one ongoing), and PRTX-100 has been granted Orphan Drug Designation in the U.S. and Europe for the treatment of Immune Thrombocytopenia (ITP). In two Phase 1b clinical trials in adult patients with active Rheumatoid Arthritis (RA), PRTX-100 was generally safe and well tolerated at all dose levels, and at certain higher doses, more patients showed improvement in measures of RA disease activity than did patients at the lower dose or placebo cohorts. PRTX-100 is given as a short intravenous infusion.