[JAK2V617F mutation and p-STAT5 protein expression in peripheral blood cells of patients with myeloproliferative neoplasm and their relations with clinical features].

This study was aimed to explore the JAK2V617F mutation and p-STAT5 expression in patients with myeloproliferative neoplasm (MPN), and investigate their relations with clinical characteristics so as to provide theoretical basis for clinical practice and target therapy. Forty-five confirmed BCR-ABL-negative MPN patients and 15 healthy adults were enrolled in this study. Real-time fluorescent quantitative PCR and Western blot were respectively used to detect JAK2V617F mutation proportion and p-STAT5 expression level. In addition, their relations with clinical characteristics of MPN were analyzed. The results showed that the positive rate of JAK2V617F mutation in MPN patients was 73.3% (33/45), including 83.3% in polycythemia vera (PV) patients (20/24), 68.8% in essential thrombocythemia (ET) patients (11/16) and 40.0% in idiopathic myelofibrosis (IMF) patients (2/5). Mutation proportions of JAK2V617F in PV, ET and IMF patients were 0.472 ± 0.245, 0.216 ± 0.162, 0.435 ± 0.239 respectively; gray values of p-STAT5 protein in PV, ET and IMF patients were 1.396 ± 0.758, 0.760 ± 0.623, 0.792 ± 0.612 respectively. JAK2V617F mutation proportion and p-STAT5 protein expression level showed a linear correlation (P < 0.05). PV patients with higher JAK2V617F mutation proportion had higher white blood cell count, hemoglobin level and hematocrit, but lower platelet count; ET patients with higher mutation proportion showed older and higher white blood cell count, hemoglobin level and hematocrit, there was no significant difference between platelet count; IMF patients with higher JAK2V617F mutation proportion showed lower white blood cell count, platelet count, hemoglobin level and hematocrit. Patients with JAK2V617F positive mutation were more likely complicated by splenomegaly, bleeding and thrombotic events. It is concluded that the incidence rate of JAK2V617F mutation is high in patients with MPN. Higher mutation proportion always connected with higher expression of p-STAT5, and easily complicates by splenomegaly and thrombotic events.