Thus, Kirchhoff and colleagues [10] revealed that anemia (Hb ≤ 12 g/L), heart failure, previous myocardial infarction, surgeon’s experience, and male gender were predictive factors for postoperative complications, while an age older than 75 years turned out to be the only significant factor for intraoperative complications. The gene discussed is GSTM1; the disease is anemia (phenotype).