Although less accurate than p-tau181, plasma GFAP also distinguished AD from the other disease groups (AUC 0.889 vs. 0.703, p < 0.001), but more efficiently against FTD (AUC 0.818) and PSP (AUC 0.765) than against CBS (AUC 0.616) and DLB (AUC 0.578). Here, GFAP is linked to frontotemporal dementia.