The products of renal tubular injury, such as kidney injury molecule-1 (KIM-1), interleukin-18 (IL-18), β-trace protein, and neutrophil gelatinase-associated lipocalin (NGAL), have promising diagnostic value for acute kidney injury or ischemic injury, but they have not been widely used clinically yet (13). This evidence concerns the gene LCN2 and acute kidney injury.