MAPT and Parkinson disease: As anticipated, t-tau and p-tau positively correlated with age (p = 0.003, p < 0.0001, respectively) and negatively correlated with MMSE scores in the PD group (rs = −0.35, p = 0.01, rs = −0.38, p = 0.009 respectively), whereas, Aβ42 didn’t correlate significantly with any of the clinical parameters.