Sanofi provides update on tolebrutinib in primary progressive multiple sclerosis PERSEUS phase 3 study in primary progressive multiple sclerosis did not meet its primary endpoint in delaying time to onset of 6-month composite confirmed disability progression compared to placeboThe safety profile of tolebrutinib was consistent with previous studies Paris, December 15, 2025. Results from the PERSEUS phase 3 study (clinical study identifier: NCT04458051) showed that tolebrutinib did not meet its primary endpo ...