October 31, 2019
In March this year, the aducanumab phase 3 Alzheimer’s disease trials were stopped based on futility, meaning that it was statistically almost impossible for the study to meet its endpoint. The operative word was apparently “almost.”
Full analysis of the phase 3 results now shows that the high dose arm of aducanumab, an anti-amyloid antibody, did indeed meet its primary and secondary endpoints, demonstrating significantly slower cognitive decline than the placebo group by CDR-sum of boxes (23% difference at 1.5 years, p=0.01 vs. placebo in the EMERGE trial). Aducanumab was also associated with reduction in brain amyloid. Safety was “consistent with earlier studies.”
Based on these results, Biogen and Eisai will file for aducanumab approval in early 2020, and are also restarting the extension studies of aducanumab. Aducanumab could be marketed as the first approved disease modifying Alzheimer’s disease drug by the end of 2020.
Biogen stock added approximately $20 billion in value as a result of this news.
Full data are expected at the CTAD meeting in December.