MDGL Stock Soars 11% on New Patent Protecting Rezdiffra Dosing Rights

Core Insights - Madrigal Pharmaceuticals (MDGL) shares increased by 10.9% following the U.S. Patent and Trademark Office's Notice of Allowance for a new patent related to the FDA-approved dosing regimen of its product Rezdiffra (resmetirom) [1][7] Company Developments - In 2024, the FDA granted accelerated approval to Rezdiffra, making it the first and only approved therapy for metabolic dysfunction-associated steatohepatitis (MASH) [2] - The new patent will protect Rezdiffra until September 30, 2044, and will be listed in the FDA's Orange Book, preventing generic competition and enhancing market exclusivity [3][7] - As of March 31, 2025, over 17,000 patients are currently receiving Rezdiffra treatment, indicating strong early demand [4][7] Clinical Pipeline - Madrigal Pharmaceuticals is awaiting a final decision on its regulatory filing for Rezdiffra for the MASH indication in the EU, expected in August [8] - The ongoing pivotal phase III MAESTRO-NASH biopsy study aims to provide long-term safety and efficacy data to support full approval of Rezdiffra for noncirrhotic MASH [9] - A second phase III outcomes study (MAESTRO-NASH OUTCOMES) is evaluating the drug's effectiveness in patients with compensated MASH cirrhosis, with top-line data expected in 2027 [10] - The open-label extension of the MAESTRO-NAFLD-1 study shows that patients treated with Rezdiffra achieved significant reductions in liver damage over two years [11][12] Market Performance - Year-to-date, MDGL shares have gained 11.8%, outperforming the industry growth of 6.3% [6]