Biogen IncPhase 2 data shows Diranersen slows cognitive decline by 42%, first tau-targeting therapy with robust biomarker reductions, advancing to Phase 3.

Biogen presented new data from its Phase 2 CELIA study of Diranersen at the Alzheimer's Association International Conference 2026, showing the investigational tau-targeting therapy slowed cognitive decline by 42% on ADAS-Cog13, 50% on MMSE, and 26% on CDR-SB at the 60 mg dose compared to placebo. Diranersen became the first tau-directed therapy to demonstrate robust reductions in both cerebrospinal fluid total tau of 50 to 65% and brain tau pathology measured by PET imaging. The therapy works by targeting MAPT mRNA to reduce production of all tau isoforms. Biogen plans to advance Diranersen into confirmatory Phase 3 development.
Biogen IncPhase 2 data shows Diranersen slows cognitive decline by 42%, first tau-targeting therapy with robust biomarker reductions, advancing to Phase 3.