MAPT and early-onset autosomal dominant Alzheimer disease: In this study, we investigated the association of cognition, as measured with Montreal Cognitive Assessment (MoCA), with CSF levels of total tau (t-tau), phosphorylated tau at threonine 181 (p-tau<sub>181</sub>), and amyloid β 1-42 (Aβ1-42) in a group of patients with FTD and Alzheimer's disease (AD).<h4>Methods</h4>We conducted a retrospective cohort study with participants selected from the electronic records of patients seen at Yale New Haven Hospital's Memory Clinic, CT, USA.