CDK1 and nonpapillary renal cell carcinoma: To study the interactions among RNASEH2A, CDK1, and CD151 and their impact on tumor proliferation, we performed si-RNA knockdown studies on three ccRCC cell lines (786O, A704, KMRC3, all with VHL mutation) and one kidney urothelial carcinoma cell line (BFTC909, without VHL mutation).