An analysis of the correlation between the methylation of individual CpG dinucleotides for the GSTP1 gene (Figure 2) demonstrated that the methylation of individual cytosines correlates in HD and BPH patients (namely C7–C12 in HD patients and C3–C15 in BPH patients; r > 0.9), while for PCa patients, a high correlation (r > 0.9) was present for C2 methylation with C6, -7, -10, -15, and -17; C6 with C2, -7, -10, -11, -15, -16, and -17; and C10 with C15, -16, and -17. Here, GSTP1 is linked to benign prostatic hyperplasia.