During the course of illness, all 11 (100%) patients developed pancytopenia (with an average WBC count of 4.79 × 109/L, an average Hb level of 71.00 g/L and average platelets of 46.73 × 109/L) and cytopenia in >2 blood cell lines (Table 2). The gene discussed is GSTM1; the disease is Pancytopenia.