Next, we categorized the TCGA-PCa specimens into three groups according to their TET1 expression levels: TET1-high (expression level above the 85th percentile, n = 51), TET1-low (expression below the 40th percentile, n = 136), and TET1-moderate (expression between the 40th and 85th percentiles, n = 154) (Fig. 2C.1), and analyzed the methylation of TET1_cg02952701. This evidence concerns the gene TET1 and posterior cortical atrophy.