MAPT and Alzheimer disease: CSF sTREM2 levels were not associated with CSF T-tau, P-tau or Aβ42 in any of the clinical subgroups, except for lvPPA (most of whom had CSF consistent with AD), where they were positively associated with levels of all three markers: T-tau (β = 0.005, P < 0.001), P-tau (β = 0.075, P < 0.001) and Aβ42 (β = 0.015, P = 0.005).