GSTM1 and anemia (phenotype): At baseline, grade I anemia (defined as hemoglobin [Hb] levels of <10 g/L) was present in 86 patients (22.9%), while 25 (6.7%) had grade II (defined as Hb levels of 8–10 g/L) and seven (1.9%) had grade III anemia (defined as Hb levels of <8 g/L).