PPI analysis demonstrated that hub genes were IFITM1, RTP4, ACSF2, GSTM2, GSTM1, ACOX2, COL4A6, ITGA2, AKR1B1, NPY, CFTR, GPX7, ALDH3A1, CRYZ, ALDH2, MAOB, GSTP1, GPX3, XAF1, and BST2, which might play important roles in DNA methylation in prostate cancer patients. This evidence concerns the gene GSTM2 and prostate cancer.