“…AD is a heterogeneous disease, and about 70 % of the risk is believed to be genetic with many genes involved (Karch et al, 2014[ 24 ]). The APOE gene that encodes apolipoprotein E (ApoE) located on human chromosome 19 is a multifunctional protein and is a major cholesterol carrier with central roles in lipid metabolism, neurobiology, and neurodegenerative diseases (Carrasquillo et al, 2013[ 11 ]; Hatters et al, 2006[ 20 ]). The APOE gene has been recognized as a possible genetic risk factor for the onset of AD (Yu et al, 2014[ 60 ]).…”