MAPT and Alzheimer disease: Multiple regression, with AD CSF biomarkers levels, adjusted for age, MMSE, sex and education level showed that CSF LDH was positively correlated with CSF total tau (β = 0.66, p‐value < 000.1) and CSF p‐tau (β = 0.67, p‐value < 0.001) and negatively correlated with Aβ40/42 ratio (β = ‐0.58, p‐value < 0.001), with no correlation with Aβ42 level (β = 0.20, p‐value = 0.135).