Tuesday brought what was arguably the most anticipated presentation of the 2026 Alzheimer’s Association International Conference when Catherine Mummery, head of novel therapeutics at University College London’s Dementia Research Center, presented data from the phase II Celia trial of tau-lowering antisense oligonucleotide diranersen (BIIB-080, Biogen Inc.). Based on both clinical and biomarker data, “Celia establishes a proof of concept,” Mummery said, that reducing tau may slow the progression of Alzheimer’s disease.

Biogen Inc. has decided to advance diranersen (BIIB-080) into registrational trials for early Alzheimer’s disease, even though the antisense oligonucleotide therapy, originally discovered by Ionis Pharmaceuticals Inc., missed its phase II primary endpoint.