MAPT mRNA expression levels were not correlated with age at blood sampling (ρ = −0.02, P value = 0.89), age of onset (ρ = −0.23, P value = 0.16), duration of disease (ρ = 0.25, P value = 0.13), or education (ρ = 0.06, P value = 0.71), ADAS (ρ = 0.20, P value = 0.25), NPI (ρ = −0.02, P value = 0.99), MADRS (ρ = 0.15, p‐value = 0.40), CDR (ρ = 0.04, P value = 0.79), and MMSE total score (ρ = 0.92, P value = 0.53) in all AD patients. The gene discussed is MAPT; the disease is Alzheimer disease.