CST3 and acute kidney injury: Whereas preoperative serum creatinine (169.73 ± 148.97 μmol/L vs. 89.74 ± 30.04 μmol/L, p = 0.027) as well as Cystatin C (2.41 ± 1.54 mg/L vs. 1.13 ± 0.35 mg/L, p = 0.029) were higher in the AKI group, [TIMP-2]*[IGFBP7] before surgery did not differ between groups (0.29 ± 0.35 vs. 0.48 ± 0.69, p = n.s.).