GRN and Alzheimer disease: Hence, the range of values was 24.2–121.1 ng/mL (mean 53.7 ± 13.7 ng/mL) for control subjects, 27.4–93.9 ng/mL (mean 51.9 ± 12.6 ng/mL) for AD subjects and 23.7–85.0 ng/mL (52.7 ± 14.7 ng/mL) for FTLD subjects without GRN mutations.