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Ther Adv Hematol. 2013 Feb;4(1):15-35. doi: 10.1177/2040620712461047.

Comprehensive review of JAK inhibitors in myeloproliferative neoplasms.

Therapeutic advances in hematology

Mohamad Bassam Sonbol, Belal Firwana, Ahmad Zarzour, Mohammad Morad, Vishal Rana, Ramon V Tiu

Affiliations

  1. Faculty of Medicine, Damascus University, Damascus, Syria.

PMID: 23610611 PMCID: PMC3629759 DOI: 10.1177/2040620712461047

Abstract

Myeloproliferative neoplasms (MPNs) are clonal hematopoietic stem-cell disorders, characterized phenotypically by the abnormal accumulation of mature-appearing myeloid cells. Polycythemia vera, essential thrombocythemia, primary myelofibrosis (also known as 'BCR-ABL1-negative' MPNs), and chronic myeloid leukemia (CML) are the primary types of MPNs. After the discovery of the BCR-ABL1 fusion protein in CML, several oncogenic tyrosine kinases have been identified in 'BCR-ABL1-negative' MPNs, most importantly, JAK2V617F mutation. The similarity in the clinical characteristics of the BCR-ABL1-negative MPN patients along with the prevalence of the Janus kinase mutation in this patient population provided a strong rationale for the development of a new class of pharmacologic inhibitors that target this pathway. The first of its class, ruxolitinib, has now been approved by the food and drug administration (FDA) for the management of patients with intermediate- to high-risk myelofibrosis. Ruxolitinib provides significant and sustained improvements in spleen related and constitutional symptoms secondary to the disease. Although noncurative, ruxolitinib represents a milestone in the treatment of myelofibrosis patients. Other types of JAK2 inhibitors are being tested in various clinical trials at this point and may provide better efficacy data and safety profile than its predecessor. In this article, we comprehensively reviewed and summarized the available preclinical and clinical trials pertaining to JAK inhibitors.

Keywords: Janus kinase 2; essential thrombocythemia; polycythemia vera; primary myelofibrosis

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