This study aims to investigate the relationship between serum secreted frizzled‐related protein 5 (SFRP5), apolipoprotein A‐I (ApoA‐I), high‐density lipoprotein 3‐cholesterol (HDL3‐C) and in‐stent restenosis (ISR) after percutaneous coronary intervention (PCI) in acute myocardial infarction (AMI) and their combined predictive value. The gene discussed is APOA1; the disease is myocardial infarction.