Of note, among FTD patients, patients presenting with pure dementia without parkinsonian features had a much higher level of total tau than patients with combined parkinsonism (FTD-P, 41.53 ± 1.10 vs. 24.14 ± 2.06, p = 0.04 by Mann–Whitney test; Figure 2). This evidence concerns the gene MAPT and Parkinsonism.