What is “biological Alzheimer’s disease”?

Abstract

Almost 50 years ago, since Robert Katzman’s article entitled “The Prevalence and Malignancy of Alzheimer’s Disease: A Major Cause of Death”, we have explained to society as a whole that Alzheimer’s disease (AD) is the leading cause of dementia and a very serious illness. Katzman was referring to dementia due to AD. This is what everyone still understands as AD: a “synonym” for dementia.