A new study suggests that PET imaging with carbon-11-labeled Pittsburgh Compound B (PiB) has revealed high amounts of beta-amyloid plaque in the brain than the APOE ε4 allele. The PiB may prove to me a better predictor of memory loss in older Americans.

http://www.auntminnie.com/index.aspx?sec=sup&sub=mol&pag=dis&ItemID=100871&wf=5124