Specifically, plasma samples with an ATG5 concentration of <45.00 pg/mL (the minimum detected value) compared to that of samples with an ATG5 concentration of ≥1270.50 pg/mL (median value of the detected values) had a higher probability of belonging to the AD, DLB, or FTD group with respect to the CTRL group (AD vs. CTRL padj = 0.024; odds ratio (OR) = 7.26; 95% confidence interval (CI) = 1.68–31.31; DLB vs. CTRL padj = 0.027; OR = 12.91; 95% CI = 2.53–65.98; FTD vs. CTRL padj = 0.030; OR = 6.57; 95% CI = 1.55–27.80) (Figure 2a). The gene discussed is ATG5; the disease is Lewy body dementia.