EFNA3 and nonpapillary renal cell carcinoma: To further analyze the effect of IL2RG, EFNA3, and MTCP1 co‐expression on the survival time of ccRCC patients, we first carried out the establishment of a multigene prognostic model, according to the PI formula, PI (n) = β′1X′n1 + β′2X′n2 + β′3 X′n3, where the “β” value was the regression coefficient B value of the independent variable (mRNA) originated from the univariate Cox analysis of the three genes, and “X” denoted the expression of mRNA.