MAPT and Alzheimer disease: CSF sTREM2 correlated positively with the neurodegenerative biomarkers T-tau (Spearman rho = 0.57; p < 0.001; n = 50; Fig. 4b) and P-tau in the control group alone (Spearman rho = 0.63; p < 0.001; n = 50; Fig. 4c) and also when the control group was merged with the AD/MCI group.