Second, we did not measure other inflammatory factors and blood lipids that may be relevant to stable angina, such as interleukin-6, tumor necrosis factor-alpha, lipoprotein(a), and apolipoprotein B. These biomarkers were not included because this study is a retrospective analysis based on routine clinical practice, where these specific markers are not commonly measured in stable angina patients. Here, APOB is linked to angina pectoris.