GRIA3 and frontotemporal dementia: Out of 69 FTD patients who underwent CSF analysis, 15 resulted above the cut-off scores (21.7%), with significant correlation between serum anti-GluA3 peptide A antibody dosage and CSF anti-GluA3 peptide A dosage (p = 0.001, Spearman’s rho correlation coefficient = 0.446) (see Supplementary Figure 1).