Synthesis levels of MMP by vSMC in AAA tissue are found to be increased compared with control aortic tissues in human and rodent studies, especially of MMP‐270, 71, 72, 73, 74, 75, 76, 77, 78 and MMP‐9.70, 72, 76, 78, 79, 80, 81 Also, other MMP, namely MMP‐1,80, 82, 83 MMP‐3,83 MMP‐7,84 MMP‐1280 and MMP‐13,85 are expressed by vSMC in AAA tissue. The gene discussed is MMP9; the disease is triple-A syndrome.