The phase 2 study randomized 305 people with amyotrophic lateral sclerosis (ALS) to receive SAR443820, a RIPK1 inhibitorRIPK1 inhibitor also known as DNL788, or placebo orally twice a day. After 24 weeks, Sanofi assessed the change from baseline on an ALS severity scale, ALSFRS-R. The clinical trial also features an open-label extension designed to measure the combined assessment of the function and survival score at Week 52. In a financial filing, Denali revealed the HIMALAYA study failed to meet the ALSFRS-R primary endpoint. Sanofi will share detailed safety and efficacy results at an upcoming scientific forum. For now, the only information is that the study missed its primary endpoint. Sanofi is continuing to study SAR443820 in a phase 2 multiple sclerosis trial. That study began dosing 13 months ago, triggering a $25 million milestone payment to Denali, and finished enrolling its 174 subjects by the end of 2023. The primary completion date is September 2025, according to ClinicalTrials.gov. The multiple sclerosis study is part of a dwindling list of opportunities open to the Sanofi-Denali RIPK1 collaboration. Sanofi paid $125 million to buy into the program in 2018, 11 months after Denali raised $250 million in the biggest biotech IPO of 2017. However, the project hit an early bump in the road when the partners switched to a backup compound in response to chronic toxicity data on their lead asset. Shares in Denali fell 7.3% to $17.02 over the course of Friday's trading.