PCSK9 and coronary artery disorder: Proprotein convertase subtilisin/kexin type 9 (PCSK9), a serine protease, has recently gain a lot of attention because of its major role in regulation of plasma low density lipoprotein (LDL) cholesterol levels [5], [6], [7], [8], [9], [10] and in determining coronary heart disease (CHD) risk [6], [11], [12].