GDF15 and coronary artery disorder: A number of protein biomarkers, including natriuretic peptides, soluble suppression of tumorigenicity 2 (sST2), growth differentiation factor-15 (GDF-15), high-sensitivity cardiac troponins (hs-cTn), C-reactive protein, interleukin 6, and myeloperoxidase, as well as multi-marker approaches, have the potential to estimate the risk of major adverse cardiac events (MACE) in patients with stable CAD [11].