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A Critical Review of the Role and Limitations of JAK Inhibitors in Myelofibrosis Therapy

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Myeloproliferative Neoplasms

Part of the book series: Hematologic Malignancies ((HEMATOLOGIC))

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Abstract

The discovery of JAK2V617F has rejuvenated interest in JAK-STAT, both as an oncogenic pathway and a drug target in BCR-ABL1-negative myeloproliferative neoplasms (MPN). While the majority of MPN patients harbor gain-of-function JAK2 or MPL mutations, the complex clonal structure of these diseases and presence of additional mutations undermine the likelihood that JAK inhibitor therapy in MPN will replicate what has been achieved with imatinib in chronic myeloid leukemia. Most of the currently available ATP-mimetic JAK inhibitors are effective in alleviating constitutional symptoms and reducing spleen size; the dominant mode of action may be downregulation of proinflammatory cytokines through anti-JAK1 activity. In contrast, myelosuppression that contributes to both the beneficial and detrimental effects on peripheral blood counts may be anti-JAK2-mediated. Nonhematologic toxicities include gastrointestinal disturbances, asymptomatic elevation of liver and pancreatic enzymes, peripheral neuropathy, and hyperacute relapse of symptoms during treatment interruption. Identification of the best-in-class JAK inhibitor in terms of overall efficacy and toxicity profile remains a work in progress.

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Acknowledgments

I have received a research grant from the Henry J Predolin Foundation.

Conflict of Interest Statement

I am principal investigator or co-investigator on clinical trials that are supported by TargeGen, Sanofi-Aventis, Incyte, BMS, Cytopia, YM BioSciences, Celgene, and Novartis. No payments outside of clinical trial support were paid to either myself or my institution. Support for laboratory investigations relevant to the clinical trials or preclinical laboratory research has been provided by TargeGen and Cytopia.

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Pardanani, A. (2012). A Critical Review of the Role and Limitations of JAK Inhibitors in Myelofibrosis Therapy. In: Barbui, T., Tefferi, A. (eds) Myeloproliferative Neoplasms. Hematologic Malignancies. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-24989-1_17

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