MAPT and Alzheimer disease: MAPT mRNA expression levels were not correlated with blood sampling (ρ = −0.11, P value = 0.61), age of onset (ρ = −0.71, P value = 0.77), duration of disease (ρ = −0.17, P value = 0.50), or education (ρ = 0.24, P value = 0.27), ADAS (ρ = −0.07, P value = 0.78), NPI (ρ = −0.13, P value = 0.55), MADRS (ρ = −0.23, P value = 0.36), CDR (ρ = −0.21, P value = 0.33), and MMSE total score (ρ = 0.35, P value = 0.08) in unmedicated AD patients.