Among them, some genes were highly dependent on BMI, such as ACTB, B2M, and GAPDH; some were highly dependent on the PCa existence, such as GUSB, IPO8, and KDM2B; and others varied in both conditions (e.g., HMBS and PPIG) and were, therefore, considered as the worst IRGs in PPATs under these different experimental conditions. This evidence concerns the gene GAPDH and posterior cortical atrophy.