[Clinical Analysis of 208 Patiets with BCR/ABL Negative Myeloproliferative Neoplasms]

To analyze the incidence, hemogram, genetics, clinical manifestations, therapeutic efficacy and outcome of patients with myeloproliferative neoplasms(MPN) so as to provide much more therapeutic basis for clinically studying the pathogenesis, diagnosis, and treatment as well as evaluating the prognosis of MPN patients.

The clinical data and related laboratory test results in 208 cases of BCR/ABL fusion gene regative MPN were collected and analyzed retrospectively.

The MPN could occur at any age, but the highest incidence was observed in patients aged 40-79. Among 208 patients with MPN, the patients with essential thrombocythemia(ET) accounted for 48.56%(101/208), the patients with polycythemia vera(PV) accounted for 25.96%(54/208), and the patients with primary myelofibrosis(PMF) accounted for 25.48(53/208). The clinical manifestation of MPN varied, the first manifestations was no-specific, onset of disease presented slow. The JAK2V617F gene mutation existed in 130 out of 208 patients with MPN, total mutation rate was 62.5%;JAK2V617F mutation rate in PV patients was 81.5%(44/54), while that in ET and PMF patients was 58.4%(59/101) and 50.9%(27/53) respectively, the detected rate of this mutation in PV patients was significantly higher than that in ET and PMF patients (P<0.05), while there was no significant difference between ET and PMF patients(P>0.05). In PV group, the WBC count of JAK2V617F positive patients was significantly enhanced (P<0.01), while there were no statistical differences of hemoglobin level and platelet count (P>0.05); in ET and PMF groups, the JAK2V617F positive patients had a higher WBC count and hemoglobin level(P<0.05), while the difference of platelet count was no significant(P>0.05). The most common vascular event in patients with MPN was ischemic cerebrovascular disease. The JAK2V617F mutation related with risk of thrombosis (OR=2.222, 95% CI=1.101 to 4.486). The difference in the incidence of vascular event between ET and PV patients was no statistically significant (P>0.05), but the incidence of vascular event in ET and PV patients was higher than that in PMF patients(P<0.05). The disease conversion much more easily happened in JAK2V617F positive patients. After treatment, the MPN could be controlled, yet the maintained treatment is needed.

The MPN can occur almost at any age, but more commonly occures in middle-aged and elderly persons. The onset of MPN varies, the clinical manifestation was similar, a high detected rate of JAK2V617F mutation is observed in MPN patients and relates closely with onset of MPN; moreover, JAK2V617F mutation rate relates with type of MPN. The MPN patients with JAK2V617F mutation have higher WBC count and higher incidence of thrombosis. After treatment, the MPN can be better controlled, and need maintenance treatment. So as to avoid the reccurence of disease, control the complications and obtain the longterm survival.