SAN DIEGO – The Clinical Trials on Alzheimer’s Disease (CTAD) meeting was a rollercoaster ride for Biogen, whose stock surged on the first day based on long-term Phase Ib results showing a reduction in amyloid plaques as well as improved cognition for patients treated with aducanumab, but shares slumped on the second day as a new safety concern spooked investors.
Biogen’s updated results from the PRIME clinical trial and extension study dominated the CTAD news on Dec