The study found that the serum Ang-1 concentration in the coronary artery of patients with AMI was higher than that of UP; the presumed reason may be as follows: (1) the inflammatory response of the coronary artery in patients with AMI is more intense than that in patients with unstable angina, and the local serum Ang-1 concentration is, therefore, high. The gene discussed is ANGPT1; the disease is angina pectoris.