In our study, only 4.35% of patients presented anemia (based on low Hb levels) at the baseline, matching the results reported by Shipton et al. [60], with 4.6% cases of low Hb levels, and Silva Ferreira et al. [61], with 7.4% cases of anemia prior to LSG. The gene discussed is GSTM1; the disease is anemia (phenotype).