The postoperative Hb was markedly higher in the not preoperative anemia group than in the preoperative anemia group (124 ± 13.3 g/L vs. 99 ± 13.1 g/L, P<0.001, n=1690 in each group, Table 2 and Figure 2B). The gene discussed is GSTM1; the disease is anemia.