With estimates that place the number of Americans who could have Alzheimer's disease by 2050 at 13.5 million, various research groups are gearing up for studies aimed at diagnosing the disease earlier, even before symptoms show. Researchers at the Banner Alzheimer's Institute in Phoenix are preparing to roll out two studies in 2012 that will treat healthy participants who have been identified to be at high risk of developing the disease. The Alzheimer's Disease Neuroimaging Initiative is also looking to use the PET tracer AV45, which helps image amyloid proteins, in future studies.

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