Mean values of MMP-1, MMP-2 and MMP-9 did not show significant difference between groups A and D. In addition, levels of MMP-1, -2, -3, -9 were not statistically different in patients with chronic aortic dissection (group B), aortic aneurysm (group C) and healthy individuals (group E). Here, MMP1 is linked to aortic aneurysm.