FUT4 and nonpapillary renal cell carcinoma: Nevertheless, the difference may be made up by more recent results: Røge et al. found CD15-positive cells in 77% of ccRCCs and 85% of papillary RCCs (there were only 13 papillary RCC cases), while Wu et al. reported expression in 246/301 (82%) of ccRCC cases [84,88].