MAPT and dementia: In terms of dementia risk, MCI patients with one or two positive Tau markers but negative or borderline Aβ42 values (MCIT+ subgroup) may be placed between patients without positive biomarkers (MCINon+ subgroup) and those with positive Aβ42 and non-positive or conflicting p-Tau/t-Tau levels (MCIAβ+ and MCIAβ+T+ subgroup, respectively).