Significant correlation was detected between the combined exosomal protein levels and MMSE scores in AD patients (adjust R2 = 0.563, P < 0.001, Additional file 1: Table S2), while only weak correlations were observed between individual single exosomal protein and MMSE scores (R2 = A0A0G2JRQ6, 0.193; C1QC, 0.207; CO9, 0.231; GP1BB, 0.176; RSU1, 0.148; ADA10, 0.125, all P < 0.001, Additional file 1: Table S2), implying the potentials of the six-protein panel to predict cognitive impairment. This evidence concerns the gene GP1BB and Alzheimer disease.