> (biomarker was a PET scan) A PET scan is not a biomarker. The Amyloid Beta (AB)* is the biomarker, the PET w/ tracer (such as the Pittsburg Compound Beta) ar

> (biomarker was a PET scan) A PET scan is not a biomarker. The Amyloid Beta (AB)* is the biomarker, the PET w/ tracer (such as the Pittsburg Compound Beta) are used to detected the biomarker. It's also important to note that Amyloid Beta is only part of the problem. Neurofibrillary Tangles (NFT) are the primary biomarker of Alzheimer's Dementia, and happen inside the neurons. NFTs disable to ability for neurons to communicate with each other, and lead to the death of disabled neurons. It is completely possible that we can't reverse AD, but can only slow it down / halt progression. *Was it AB40 / AB42 / or a different Amyloid Beta?