The quantitative values of thirteen of the fourteen proteins, including the four proteins based on the literature (CD 40 ligand (CD40L), matrix metallopeptidase 9 (MMP9), myeloperoxidase (MPO), and pregnancy-associated plasma protein A (PAP-PA)) that are reportedly related to cardiac artery disease and plaque rupture and are known as markers of MI, were obtained using the MRM final parameter method. The gene discussed is MMP9; the disease is myocardial infarction.