ORC6 and nonpapillary renal cell carcinoma: RT-qPCR assay indicated that ORC6's mRNA expression in ccRCC cells (786-O, Caki-1, ACHN, A-498, OSRC-2) was significantly higher than HK-2 cells (Fig. 6A), and that compared with normal tissues, ORC6's mRNA expression in ccRCC tumor tissues was also higher (13 cases of 15 cases were upregulated, Fig. 6B).