Globenewswire·2025-12-15 06:05Core Insights - Sanofi's tolebrutinib did not meet its primary endpoint in the PERSEUS phase 3 study for primary progressive multiple sclerosis (PPMS), leading the company to decide against pursuing regulatory registration for this indication [1][8][10] Company Updates - Sanofi expressed disappointment over the study results but emphasized the importance of these findings in enhancing the understanding of multiple sclerosis biology [2] - The safety profile of tolebrutinib was consistent with previous studies, with drug-induced liver injury (DILI) identified as a risk, necessitating strict liver monitoring [2][4] - Tolebrutinib was provisionally approved in the UAE for non-relapsing secondary progressive multiple sclerosis and is under regulatory review in the EU and other regions [3] Financial Considerations - Sanofi will conduct an impairment test on the intangible asset value of tolebrutinib, with results expected in January 2026, but this will not impact the business net income or financial guidance for 2025 [4] Industry Context - Multiple sclerosis (MS) is characterized by progressive disability, with PPMS representing about 10% of the overall MS patient population [1][5] - There is a significant unmet need in addressing disability accumulation in MS, particularly for secondary progressive multiple sclerosis [6]