Biotechnology US biotech major Biogen saw its shares rocket more than 41% to $315.74 in pre-market trading, after, along with partner Eisai, today announced that, following consulting with the US Food and Drug Administration, Biogen plans to pursue regulatory approval for aducanumab, an investigational treatment for early Alzheimer’s disease (AD), which has previously seen disappointing clinical results. 22 October 2019