Coexistence of JAK2V617F Mutation and BCR–ABL Translocation in a Pregnant Woman with Essential Thrombocythemia

In 2012, a 25-years-old pregnant woman presented with thromocytosis for 4 months, blood counts showed platelets 701 × 109/L. Bone marrow examination disclosed a feature of hypercellular marrow in erythrocytic,granulocytic and megakaryocytic series. Cytogenetic analysis showed t(9;22)(q34;q11) in 100 % of metaphase. The percentage of BCR–ABL-positive FISH signals was 37 % in the peripheral blood. Molecular analysis showed the presence of the JAK2V617F mutation and BCR–ABL mRNA b3a2 transcript. A diagnosis of concomitant presence of essential thrombocythemia and chronic myelocytic leukemia was made. Based on this case and literatures reported before, it might be necessary to detect JAK2-V617F mutation and BCR–ABL fusion gene concomitantly in myeloproliferative neoplasms patients.