HGF and acute kidney injury: Urine HGF, IGFBP-7, TIMP-2 and NGAL may improve our ability topredict the odds and timing of recovery and eventually renal support withdrawal.Acute kidney injury recovery requires more study, and its definition needs to bestandardized to allow for better and more powerful research on biomarkersbecause some of them show potential for the prediction of acute kidney injuryrecovery.