MAPT and amyloidosis: Our data do not have PET amyloid imaging results, but extremely high concordance exists between low CSF Aβ42 and positive PET amyloid imaging, and T-tau/Aβ42 and P-tau/Aβ42 show excellent predictive power for high amyloid-plaque deposition (Fagan et al., 2006; Tolboom et al., 2009; Fagan et al., 2011).