ANPEP and coronary artery disorder: Nevertheless, there were significant differences between the obstructive and non-obstructive CAD groups in levels of APN (9.32±6.03 vs 11.34±8.6 μg/mL, P=0.004) and HMW APN (5.59±3.93 vs 7.08±6.1 μg/mL, P=0.003).