One of the things that I think is being overlooked here (at least it was by me) is SavaDx

Update on SavaDx
SavaDx is an investigational diagnostic candidate to detect Alzheimer’s disease with a simple blood test. SavaDx was evaluated for its ability to detect treatment effects of simufilam versus placebo in a randomized, controlled study completed in 2020. This was a Phase 2b study that enrolled 64 patients with Alzheimer’s disease. The SavaDx clinical dataset will be presented at AAIC the week of July 26-30th.