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Activating mutations of the JAK2 gene are of tumorigenic significance in myeloproliferative neoplasms. Translocations involving the JAK2 locus are of oncogenic importance in acute leukemias, myelodysplastic/myeloproliferative diseases and T-cell lymphomas. JAK2 locus gains, which are recurrent in Hodgkin's- and primary mediastinal B-cell lymphoma, are also efficient mechanisms of JAK2 activation. Recently, specific drugs blocking JAK2 have been developed and are currently in clinical trials.