TREM2 and Alzheimer disease: 12 AD-related biomarkers were evaluated, including amyloid β (Aβ42, Aβ40, Aβ42/Aβ40 ratio), hyperphosphorylated tau (P-tau), neuronal injury/degeneration (T-tau, NFL, NSE, H-FABP, VILIP-1), neuroinflammation biomarkers (YKL-40, TREM2), and α-synuclein (α-synuclein).