To the Editor:Abdominal aortic aneurysm (AAA),a disease defined as a 50％ increase in the aortic diameter or the diameter larger than 30 mm compared to the normal abdominal aortic,is a severe and chronic disorder occurring mostly among men older than 65 years of age.[1] Understanding the risk factors and the biomarkers for AAA formation is imperative for creating targeted interventions to prevent,screen,or slow the disease progression.