EGR1 and nonpapillary renal cell carcinoma: A comparison of subpopulation characteristics between normal kidney tissues and ccRCC revealed that the proportion of cells in the NK(EGR1) and NK(CAPG) subpopulations was significantly higher in ccRCC than that in these subpopulations in normal kidney tissues (Figures 3(a) and 3(b)), thus suggesting that the NK(EGR1) and NK(CAPG) subpopulations play a facilitatory role in tumourigenesis.