BACE1 and Alzheimer disease: Moreover, we further investigated the correlation between LncRNA 17A, 51A, BACE1 and BC200 in plasma of AD patients and control groups, indicating there were mild-moderate positive correlations between LncRNA 17A with LncRNA BACE1 (r = 0.82, p < 0.001, Fig. 2) and LncRNA 51A with LncRNA BC200 in AD patients (r = 0.78, p < 0.001, Fig. 2).