The Effect of DPP4 Inhibitor on Vasclular Healing

Inclusion Criteria: * Non-ST segement elevation acute coronary syndrome Exclusion Criteria: * Left main disease * Known hypersensitivity or contraindication to any of the following medications: Heparin, aspirin, clopidogrel, sirolimus, siptagliptin and statin * Congestive heart failure (patients with LVEF \<30% or cardiogenic shock) * Uncontrolled myocardial ischemia (repeated chest pain or dyspnea after revascularization) * Uncontrolled ventricular arrhythmia * History of malignancy with chemotherapy * Serious hematologic disease (e.g. CML, MDS) * Current infectious disease needs antibiotics therapy * Creatinine level \>1.5 mg/dL or dependence on dialysis * Other severe concurrent illness (e.g. active infection, malignancy). * Life expectancy of less than one year * Pregnancy or women with potential childbearing * Type I DM * Treatment with insulin * History of pancreatitis * Who cannot read the informed consent form (e.g. illiteracy, foreigner)