Multivariate analysis showed that the following 5 baseline variables independently associated with the lower OS: higher age [hazard ratio (HR) 477.6; 95% CI 276.3–825.4; p < 0.001], a history of CHD (HR 1.831e−57; 95% CI 3.581e−60–9.362e−55; p < 0.001), lower preoperative Hb (HR 0.460; 95% CI 0.360–0.590; p < 0.001), higher ASA score (HR 1.224e+26; 95% CI 2.485e+23–6.033e+28; p < 0.001), and postoperative histology (HR 2.851e+25; 95% CI 6.885e+23–1.180e+27; p < 0.001) (Table 3). The gene discussed is GSTM1; the disease is coronary artery disorder.