When categorized into three groups according to the tertile of baseline serum NGAL (NGAL tertiles, 1st: 25.4 to 83.7 ng/mL, 2nd: 83.8 to 143.8 ng/mL, 3rd: 143.9 to 567.9 ng/mL), there was a significant trend toward higher serum NGAL levels with older age, hypertension, diabetes, chronic kidney disease, low ejection fraction, high C-reactive protein, higher contrast volume, multivessel coronary disease, larger number of stents, and longer stent length. The gene discussed is LCN2; the disease is coronary artery disorder.