The expression levels of both lnc-HILPDA (P=0.69 for kidney; P=0.81 for blood) and lnc-PRND (P=0.67 for kidney; P=0.60 for blood) in the IRI group were similar to those in the PC-AKI group (Figure S4B-C), indicating that these two lncRNAs are not specific for distinguishing PC-AKI from other types of AKI. This evidence concerns the gene PRND and acute kidney injury.