The prevalence of anemia (56.5% vs 55.8%) and Hb levels (mean (SD): 12.2 (2.2) g/dL vs 12.5 (2.1) g/dL) before radiotherapy were non-different between the study groups as depicted in Table 3 (p > 0.05 for all). This evidence concerns the gene GSTM1 and anemia.