CUL9 and nonpapillary renal cell carcinoma: We then used logistic regression analysis to establish an emRNA-based diagnostic signature using CUL9, KMT2D, and PREX2, logit (p = ccRCC) = 1.68689 × CUL9 − 1.16173 × KMT2D + 1.17881 × PREX2 + 0.75145.