TREM1 and Alzheimer disease: Recent years, much attention has been paid to the role of TREM1/2 in the neuropsychiatric diseases including Alzheimer's disease (AD), although the results are not always consistent (Jiang et al., 2016; Suarez-Calvet et al., 2019; Jiang et al., 2017; Sayed et al., 2018).