She also had a 3-year history of persistent leukocytosis (WBC now 16.4 × 109/L) with neutrophilia (neutrophils 72%) and thrombocytosis (826 × 109/L), with recently additional erythrocytosis (Hb 17.2 g/dL; Hct 51.1%). Here, GSTM1 is linked to Thrombocytosis.