INS and diabetes mellitus: Several meta-analyses comparing BMS and DES in DM patients [26], comparing the effectiveness of different types of DES [27, 28], or comparing the clinical outcomes in DM patients undergoing PCI and Coronary Artery Bypass Grafting (CABG) have been conducted but no one has yet conducted a meta-analysis between insulin-treated and non-insulin treated DMpatients after PCI [29].