Some studies have also shown a significant role for AD-related tau protein species (total tau, caspase cleaved tau fragments, phosphorylated tau) in the blood following mTBI in athletes and military personnel (Di Battista et al., 2013; Neselius et al., 2013b; Shahim et al., 2014, 2016; Olivera et al., 2015; Rubenstein et al., 2015; Gill et al., 2018). This evidence concerns the gene MAPT and Alzheimer disease.