After PPI analysis, 22 hub genes related to ccRCC stood out, among which CD4, PTPRC, CCNA2, CD8A, BUB1, ASPM, BUB1B, KIF20A, CENPF, DLGAP5, ITGB2, KIF2C, TYROBP, BIRC5, CEP55, ITGAM, MELK, NUSAP1, and TPX2 were found to differentially methylated genes between ccRCC tissues and paired tumor-free kidney tissues. This evidence concerns the gene CD8A and nonpapillary renal cell carcinoma.