GFAP and frontotemporal dementia: A significant increase in GFAP and NfL levels was observed in FTD patients compared to CTRL subjects (mean ± SEM; GFAP: FTD, 152.60 ± 16.32 pg/mL vs. CTRL, 75.55 ± 13.26 pg/mL, Generalized Linear Model, p = 0.0178; NfL: FTD, 25.28 ± 2.54 pg/mL vs. CTRL, 10.30 ± 0.88 pg/mL, Generalized Linear Model, p < 0.0001) (Figure 1b,c).