Between 2015 and 2016, 99 patients with at least grade 2 anaemia (Hb < 10 g/dl) and iron deficiency (defined as ferritin <800 ng/mL and TSAT <50%)8 were included in the study and treated with FCM infusions according to body weight as described in the methods section (a total of 1500 mg if 35 Kg to <70 Kg or 2000 mg if ≥70 Kg). The gene discussed is GSTM1; the disease is anemia.