However, there was an observable trend suggesting a disparity, attributable to the relatively lower Hb levels in Group B. The underlying cause of this trend can be primarily attributed to the disproportionate influence of patients with hemorrhage in Group B. In terms of perioperative transfusion, 6.9% of patients in Subgroup A1, 5.5% of patients in Subgroup A2, and 1.8% of patients in Group B received transfusions, without significant differences between the groups. This evidence concerns the gene GSTM1 and hemorrhage.