PECAM1 and nonpapillary renal cell carcinoma: In these genes, 12 genes expression were upregulated in ccRCC tissues compared with normal kidney samples in TCGA and GTEx, including UBE2C, PYCARD, TIMP1, CEBPB, MMP9, LGALS1, PECAM1, CSPG4, COL4A2, BNIP3, CCND1, TLR3.