CD34 and coronary artery disorder: Indeed, though there was no control group in this study, the number (0.021 ± 0.015%) of circulating CD34+KDR+ EPCs of our patients was much lower than that (1.2 ± 1.0%) of the local healthy subjects in similar age, and higher than that (0.007 ± 0.007%) in another group of age-matched patients with severe coronary artery disease in our previous study [[39],[40]].