NASHVILLE, Tennessee, Jan. 16 -- Vanderbilt University Medical Center issued the following news release: * * * Study finds so-called super agers tend to have at least two key genetic advantages * The gene variant posing the greatest genetic risk of late-onset Alzheimer's disease (AD) is called APOE-e4. A different variant of the same gene, APOE-e2, is thought to confer protection against AD. A comparatively large study reported Jan. 16 in Alzheimer's & Dementia, The Journal of the Alzheime more PR