Plotting TFRC content with age followed by simple regression analysis revealed that these variations are not significantly interdependent in CN individuals (TFRC in CN vs. Age: Slope: 1.020, p-value = 0.5112, R-squared = 0.02930), AD (TFRC in AD vs. Age: Slope: 0.4413, p-value = 0.2233, R-squared = 0.02052), and PD (TFRC in PD vs. Age: Slope: -1.249, p-value = 0.1287, R-squared = 0.08986) patient groups (Figures 7F–H). This evidence concerns the gene TFRC and Alzheimer disease.