ITGAM and abdominal aortic aneurysm: The ITGAM (also called CR3A, MO1A, CD11B, MAC-1, MAC1A, and SLEB6) gene, located on chromosome 16p11.2, encodes integrin-α M, which is an essential adhesion molecule and might promote the development and progression of abdominal aortic aneurysm by mediating the endothelial cell adhesion and transendothelial migration of circulating monocytes/macrophages9.