The laboratory showed marked anaemia (red blood cells (RBC), 2.67 × 106/μL, Haemoglobin (Hb) 7.7 g/L) and leucopaenia (white blood cells (WBC), 2.17 × 103/μL), a moderately low platelet count (PLT, 92 × 103/μL), raised lactic-dehydrogenase (LDH) (747 U/L, N < 250), and IgM (4.7 g/L, N < 2.5). Here, GSTM1 is linked to anemia (phenotype).