To investigate the relationship between pre- and post-EVAR serum miR-28-5p expression and T cell subsets (CD3+, CD4+, CD8+) as well as lipid components (TC, TG), the CD3+, CD4+, CD8+, TC, and TG of AAA patients pre- and post-EVAR were statistically analyzed. The gene discussed is CD8A; the disease is triple-A syndrome.