At the same time, RBV 800 mg/d was introduced (58 kg, haemoglobin (Hb) 14.7 g/dL) but suspended after 2 weeks because of anaemia (Hb 8.0 g/dL) that required 2 units of packed red blood cells at week (W) 4 (Hb 6.8 g/dL) and EPO 10,000 IU weekly. Here, GSTM1 is linked to anemia (phenotype).