If approved, tolebrutinib will be the first and only brain-penetrant BTK inhibitor for the treatment of relapse-free, secondary-progressive MS and the slowing of disability accumulation, irrespective of relapse activity.

Tolebrutinib has been granted 'breakthrough drug' designation by the FDA, based on positive results from the HERCULES Phase III study. A marketing authorisation application is also under review by EU regulatory authorities.

https://www.marketscreener.com/quote/stock/SANOFI-4698/news/Sanofi-FDA-priority-review-in-MS-49421131/