GSTM1 and nutritional deficiency disease: At the time of diagnosis, the patient was 14 years old and suffered from severe malnutrition with an iso body mass index (isoBMI) of 10.5 kg/m2 (reference value at age 14 years; 16-26 kg/m2), anemia (Hb 93 g/L), and thrombocytosis (732 x 109/L).