Annexon Showcases Tanruprubart Data Demonstrating Improved Clinical Outcomes in Guillain-Barré Syndrome (GBS) at 2025 Peripheral Nerve Society (PNS) Annual Meeting

Core Insights - The article highlights the presentation of the Tanruprubart Real-World Evidence (RWE) study, demonstrating its benefits over the current standard of care for Guillain-Barré Syndrome (GBS) patients [1][4] - Tanruprubart, a first-in-kind monoclonal antibody, shows significant improvements in muscle strength and overall recovery compared to existing treatments [2][3] Company Overview - Annexon, Inc. is a biopharmaceutical company focused on developing novel therapies for classical complement-mediated neuroinflammatory diseases [1][11] - The company’s lead investigational therapy, Tanruprubart, targets C1q to reduce inflammation and nerve damage in GBS [9][11] Clinical Findings - The RWE study matched Tanruprubart-treated patients with those receiving standard care (IVIg or PE), showing a rapid increase in muscle function and sustained recovery [4][8] - By Week 1, patients treated with Tanruprubart exhibited approximately a ten-point improvement in muscle strength compared to those on IVIg or PE [8] - Tanruprubart-treated patients were about three times more likely to achieve a better state of health on the GBS-Disability Scale at Weeks 4, 8, and 26 [8] Treatment Impact - Tanruprubart demonstrated rapid clinical benefits, including improvements in muscle strength, mobility, balance, and coordination, maintained through Week 26 [8] - The treatment allows patients to regain independence and return to daily activities sooner than with standard therapies [8][9] Disease Context - GBS is a rare autoimmune disease affecting at least 150,000 people globally each year, with no FDA-approved therapies currently available [2][10] - The disease can lead to severe weakness and paralysis, often requiring intensive care [2][10]