We also found elevated levels of BACE1, CST3 (cystatin‐C), GDI1, GFAP, IGFBP7, IL15, tTau, PGF, pTau, PTN, and SNAP25 (synaptosomal‐associated protein‐25) in AD compared to FTD. Here, BACE1 is linked to Alzheimer disease.