The area under the ROC curve for NGAL discriminating severe coronary stenosis was 0.838 (95% CI: 0.752–0.923, P<0.001), which was greater than that for MMP-9 [0.818, (95% CI: 0.724–0.912, P<0.001)], IL-1β [0.485, (95% CI: 0.369–0.601, P = 0.791)], and hs-CRP [0.607, (95% CI: 0.492–0.722, P = 0.061)]. The gene discussed is LCN2; the disease is coronary stenosis.