GFAP and primary progressive aphasia: Specifically, the mean RNA expression of GFAP in the PPA group was 1.63 (±0.49)-fold higher (statistically significant, p < 0.05, n = 8) than the control group (Figure 3A), while protein concentration was 50.36 (±4.99) [pg/mL] in the PPA group versus 36.42 (±6.734) [pg/mL] in the control group (Figure 3D) (p < 0.0001, n = 12).