No visual impairment was documented and only a moderate anemia was reported (Hb 8.7 g/dL, 75 × 109 reticulocytes/L, 283 × 109 platelets/L, 10.2 × 109 leucocytes/L, 1.4 × 109 neutrophils/L, before conditioning for HSCT). The gene discussed is GSTM1; the disease is anemia.