Roche BTK Inhibitor Sees Positive Phase 3 MS Data
Roche says its investigational Bruton’s tyrosine kinase (BTK) inhibitor fenebrutinib showed the strongest late-stage results yet reported for the drug class in multiple sclerosis, meeting primary endpoints in two pivotal Phase 3 studies and positioning the oral therapy as a potential competitor — and possible successor — to some of the field’s most effective biologics.
In relapsing MS, the first of two nearly identical studies, FENhance 2, showed that fenebrutinib significantly reduced annualized relapse rates compared with the active comparator teriflunomide over at least 96 weeks, according to the company Full efficacy data were not disclosed, but Roche describes the outcome as “unprecedented” for a BTK inhibitor in MS. A second study, FENhance 1, is expected to read out in the first half of 2026 and will be required before regulatory submissions.
Meanwhile, in primary progressive MS — an area with just one approved therapy — the FENtrepid trial met its primary endpoint, demonstrating that fenebrutinib was non-inferior to Roche’s own Ocrevus (ocrelizumab) in delaying the onset of confirmed disability progression over at least 120 weeks. Roche says the therapy even showed a numerical advantage as early as week 24, a trend that reportedly persisted through the observation period.
Fenebrutinib is described as a non-covalent, reversible BTK inhibitor designed to block inflammatory B-cell activity as well as microglial activation in the central nervous system — targeting both acute relapses and the chronic neurodegeneration thought to drive disability progression.
Safety signals, including liver-related findings, were consistent with earlier Phase II studies, the company said, though additional analyses are underway, Roche says.
If the second study confirms the current results, Roche is expected to move quickly toward global regulatory submissions — potentially positioning fenebrutinib as the first oral therapy to show high efficacy across both MS types.