In order to identify the association between clonal hematopoiesis of indeterminate potential (CHIP) and cardiovascular risks after smoking cessation, this study intends to recruit ACS patients undergoing complete revascularization and perform whole-exome sequencing for enrolled patients to identify the prevalence of CHIP mutations. After 1-year follow-up, the relationship of presence of CHIP mutations and the occurrence of MACCEs will be explored, irrespective of smoking cessation or not. CHIP may be a potential risk factor of poor prognosis of ACS.

Inclusion Criteria:

• 1. In-patients with acute coronary syndrome to undergo PCI 2. Complete revascularization during the index hospitalization 3. Written informed consent

Exclusion Criteria:

• 1. Periprocedural complications (coronary artery dissection, perforation, myocardial infarction, stroke, death) 2. Planned coronary revascularization at discharge 3. Patients with severe chronic disease (uremia, liver cirrhosis, COPD (chronic obstructive pulmonary disease) 4. Abnormal blood counts caused by hematological diseases 5. Diagnosed malignancy

ACS patients undergoing complete revascularization