MAPT and Alzheimer disease: In the ADNI cohort, there is no correlation with any of the biomarkers (Aβ1-42, t-tau and p-tau181) from cerebral spinal fluid (CSF) in any of the three diagnostic subgroups, or the overall group (results not shown, biomarker data from [31]), but some positive correlations were found for p-tau181 in plasma, for AD patients only (p < 0.05 at 3 probes, Additional file 3: Table S3).