What's more, the top ten upregulated DEGs (UBE2C, CDC20, BIRC5, RNASEH2A, TK1, TACC3, CXCR4, SDC1, RNASEH2B and RNASEH2C) (Table 2) and top ten downregulated DEGs (KDR, HSD17B6, NANOG, AOX1, CYP3A5, ALDH1A1, ADH1B, MAOB, ALDH1A2 and FGF13) (Table 2) were regarded as hub genes in ovarian cancer and selected for the following investigation. This evidence concerns the gene NANOG and ovarian cancer.