MAPT and Alzheimer disease: Similarly, in AD patients cerebrospinal fluid Aβ42 levels, but not total tau and p-tau, significantly correlate with severity of extrapyramidal signs, with gait and mobility, and with static and dynamic balance (evaluated by Unified Parkinson’s Disease Rating Scale (UPDRS) part 3; Rating Scale for Gait Evaluation in Cognitive Deterioration (RSGECD); and by Tinetti scale score, respectively) [47].