CHD: coronary heart disease, MDA: malondialdehyde, ox-LDL: oxidized low-density lipoprotein, hs-CRP: high-sensitivity C-reactive protein, MMP-9: matrix metalloprotease-9, TC: total cholesterol, TAG: triacylglycerol, HDL: high-density lipoprotein, LDL: low-density lipoprotein, VLDL: very low-density lipoprotein. The gene discussed is MMP9; the disease is coronary artery disorder.