The ROCs for the prediction of the combined outcome of AKI or MACE showed a higher AUC for NGAL (NGAL 0.67 vs. CRP 0.64 vs. WBC 0.60); however, these differences (NGAL vs. CRP p = 0.39, NGAL vs. WBC p = 0.12) did not reach statistical significance (Figure 3). This evidence concerns the gene LCN2 and acute kidney injury.