GSTM1 and Decreased total leukocyte count: Initial hematologic evaluation demonstrated pancytopenia with leukopenia (WBC 2.1 × 109/L; reference 4.0–10.0 × 109/L), neutropenia (1.40 × 109/L; reference 2.04–7.5 × 109/L), and severe anemia (Hb 68 g/L; reference 110–150 g/L) with erythrocytopenia (RBC 2.40 × 1012/L; reference 3.5–5.0 × 1012/L).