We assessed expression of factors/molecules related to inflammation or fibrosis in AAA and normal aortic wall tissues by using real-time PCR for the following: MCP-1; TNF-α; TGF-β; matrix metalloproteinase-1, -2, -3, and -9; and tissue inhibitor of metalloproteinase-1, -2, -3, and -9. The gene discussed is MMP1; the disease is triple-A syndrome.