Coronary artery disease is the most important cause of death worldwide. Treatment option for coronary artery disease is medical treatment, percutaneous coronary intervention, or coronary artery bypass surgery. Among them, the field of percutaneous coronary intervention is rapidly developing with regard to the improvement of devices, techniques, or medical treatment, leading to reduce mortality or morbidity. Until now, numerous previous studies related to the risk factors of coronary artery disease and the prognosis of patients have been conducted. However, the field of percutaneous coronary intervention is rapidly evolving, and treatment strategies are constantly being updated. Therefore, the current study sought to identify the long-term prognosis and related risk factors of patients with coronary artery disease who underwent percutaneous coronary intervention.