IGFBP7 and acute kidney injury: Similarly, in the cohort of preterm neonates without AKI, the concentrations of uNGAL and TIMP-2*IGFBP7 were not influenced by gender, GA and BW (Table 2), except for higher values of uNGAL in females (46.5 vs. 10.0 ng/ml; Mann-Whitney U-test, p = 0.013) (Fig. 2).