Figure 7. Validation of the gene expression levels of PTTG1, RRM2, TOP2A, UHRF1, CEP55, BIRC5, UBE2C, FOXM1 and CDC20 between normal kidney and ccRCC tissues in GEPIA database. (A–I) PTTG1, RRM2, TOP2A, UHRF1, CEP55, BIRC5, UBE2C, FOXM1 and CDC20 are significantly upregulated in ccRCC compared with normal tissues (P < 0.01). The red * represents P < 0.01.