GSTM1 and coronary artery disorder: This retrospective study of 2,344 (HRR < 10.25) and 3,702 (HRR ≥ 10.25) CAD PCI patients at The First Affiliated Hospital of Xinjiang Medical University from January 2008 to December 2016 provides compelling evidence that the HRR, which is the ratio of Hb to RDW, is a novel and powerful indicator of the clinical outcomes of CAD PCI patients.