An analysis of the correlation between the methylation status of individual cytosines for the GSTP1 gene in tcfDNA (Figure 2, Pearson correlation coefficients for logarithms of concentrations were computed) demonstrates that the methylation of individual cytosines correlates in PCa patients (namely, C1–C2,8–10,12,14–17; C2–C8–10,12–17; C3–C4–7,11,12; C4–C5–7,11,12; C5–C6,7,11,12; C6–C7,11,12; C7–C11,12; C8–C9,10,12,14–17; C9–C10,12,14–17; C10–C11,14–17; C11–C12; C12–C14–17; C14–C15–17; C15–C16,17; r > 0.9). This evidence concerns the gene GSTP1 and posterior cortical atrophy.