MMP9 and coronary artery disorder: In stable CHD patients, an elevated Lp(a) level (>50 mg/dL) was associated with nonclassical or intermediate monocytes (CD14++ CD16+) [29], which in turn produce MMP-9 [30], was related to TCFA [31], and independently predicted cardiovascular events in subjects referred for elective coronary angiography [32].