Whole blood of CAD patients had lower GSH levels than that of Ctrl (5.97±0.3 and 7.70±0.3 μM/g Hb, mean±SE, respectively, P<0.0001) and higher levels of GSSG (0.62±0.04 and 0.29±0.04 μM/g Hb, mean±SE, respectively, P<0.0001). Here, GSTM1 is linked to coronary artery disorder.