MMP9 and aneurysm: Analysis of our TAV group's data showed no significant difference in the protein levels between the aneurysm's anterior and posterior parts (Pro-MMP-2, p=0.498, active MMP-2, p=0.416, total MMP-2, p=0.373, MMP-14, p=0.244, TIMP-2, p=0.121, MMP-9, p=0.227, and TIMP-1, p=0.860) (Figure 3).