The Alzheimer’s disease (AD) space took another blow along with the shares of Cassava Sciences Inc. (NASDAQ:SAVA), which plummeted by 83.8%, or $22.19, to end Nov. 25 at $4.30 after the firm unveiled top-line data from the phase III Rethink-Alz study with simufilam. The study tested simufilam in mild to moderate AD, where results fell short of each of the prespecified co-primary, secondary and exploratory biomarker endpoints.