GSTM1 and acquired polycythemia vera: The first routine blood test at the time of admission in 170 patients with PV showed a white blood cell count (WBC) of 9.35 ± 5.07 × 109/L, red blood cell count (RBC) 6.61 ± 1.03 × 1012/L, hemoglobin count (Hb) 195.28 ± 15.97 g/L, and platelet count (PLT) 281.31 ± 190.13 × 109/L (Table 1).