PLIN2 and Alzheimer disease: At an optimal cutoff value of 1.7, subject expression score of the ADRP showed a sensitivity of 68.75%, a specificity of 96.88%, a positive predictive value of 0.96 (22 true-positive and 1 false-positive findings), and a negative predictive value of 0.76 (31 true-negative and 10 false-negative findings) for distinguishing AD patients from NCs.