XIST and triple-A syndrome: In this study, miR-1264 expression was negatively associated with XIST expression in the serum of AAA patients and was also down-regulated in AAA mice model artery tissues The deficiency of miR-1264 reversed the effects of proliferation inhibition and apoptosis promotion by XIST knockdown in HA-VSMCs indicating miR-1264 mediated XIST’s influence on the procedure of AAA.