In GT, topics related to the characteristics and etiology of AD (Dementia, Memory, Cognitive, Agedness, Apolipoprotein E, Acetyl Choline), early onset AD (Early onset Alzheimer's disease), AD-related associations (Alzheimer's Disease and Related Disorders Association, ADRDA), care of AD patients (Caretaker), and diseases that can easily be confused with AD (Parkinson's disease, Vascular Dementia) have received special attention. This evidence concerns the gene APOE and Parkinson disease.