IFNG and acute kidney injury: Taken all the results together, we found that IFN-γ and SCGF-β were the most relevant two cytokines that have both the remarkable differences with P < 1E–5 between AKI and non-AKI patients as well as among subjects with different AKI stages, and the highest correlation coefficients of r > 0.5 with the postoperative changes of SCr after cardiac surgery.