Slow coronary flow phenomenon is an important clinical entity because it may be the cause of angina at rest or during exercise, acute myocardial infarction and hypertension.19,20 There have been several hypotheses suggested for slow coronary flow phenomenon since first described in 1972 by Tambe et al.11 In this theory, endothelial activation and inflammation, which have been reported to be a major contributing factor to many cardiovascular events and demonstrated to be associated with different clinical settings of coronary artery disease, are the most acceptable hypotheses for SCF.13, 21-23. The gene discussed is KITLG; the disease is myocardial infarction.