ITGB1BP2 and nonpapillary renal cell carcinoma: Thirteen integrin mRNAs were found overexpressed in CCRCC patients at stages III and IV relative to the subjects at stages I and II, including four mRNAs that are believed to be the negative factor to survival (ITGAE, ITGAV, ITGB1BP2 and ITGB5) (Fig. 6d).