MMP9 and triple-A syndrome: The results indicated that high TLR4 expression was more frequent in smoking patients and large AAA compared to low TLR4 expression (P = 0.015 and 0.022, respectively), while high MMP9 expression had a significantly higher ratio of smokers and thrombus within AAA than low MMP9 expression (P = 0.025 and 0.013, respectively).