GSTM1 and anemia (phenotype): Among the patients who could be evaluated for anemia benefits (n = 111) from both phases (core/extension), 75% and 68% of the patients achieved transfusion-independence for 8 and 12 weeks, respectively; and 28% of the patients with Hb < 10 g/dL had an anemia response (median Hb increase 2.4 g/dL) for both 8 and 12 weeks [93].