After adjusting for the confounding factors, the risk of developing postoperative MI remained significantly higher in the lowest serum ACE2 level quartile group than in the highest quartile group, 1 h post surgery, indicating that the serum ACE2 level 1 h post surgery may be an independent risk factor for postoperative MI following CABG. The gene discussed is ACE2; the disease is myocardial infarction.