Abstract: This invention relates to treating Myeloproliferative neoplasms (MPNs), specifically Polycythemia Vera (PV). In particular, the invention relates to compositions and methods for inhibiting Polycythemia Vera (PV)-initiating cells, e.g. subsets of hematopoietic stem cells that cause PV symptoms. For one example, Montelukast (e.g., Singulair®) may be used for preventing the development of PV or reducing PV symptoms over long periods of time. Further, Montelukast in combination with other compounds, e.g., JAK2 inhibitor compounds, may also find use for treating patients genetically at risk for developing PV and for PV patients.

Abstract: Provided in the present invention is a compound having these structure of formula I or a pharmaceutically acceptable salt thereof. Also provided in the present invention is a pharmaceutical composition containing the compound, and a use of the compound for treating cancers.

Abstract: Methods of treating a subject having, or at risk of having, a myeloproliferative disorder are provided according to embodiments of the present invention which include administering a therapeutically effective amount of an arachidonate 5-lipoxygenase (5-LO) inhibitor to the subject. Combinations of therapeutic agents are administered according to embodiments of the present invention. In some embodiments, two or more 5-LO inhibitors are administered to a subject to treat a myeloproliferative disorder. In further embodiments, at least one 5-LO inhibitor and at least one additional therapeutic agent are administered to a subject to treat a myeloproliferative disorder. Methods of inhibiting leukemia stem cells are provided according to embodiments of the present invention which include contacting leukemia stem cells with an effective amount of an arachidonate 5-lipoxygenase inhibitor.

Abstract: Methods of treating a subject having, or at risk of having, a myeloproliferative disorder are provided according to embodiments of the present invention which include administering a therapeutically effective amount of an arachidonate 5-lipoxygenase (5-LO) inhibitor to the subject. Combinations of therapeutic agents are administered according to embodiments of the present invention. In some embodiments, two or more 5-LO inhibitors are administered to a subject to treat a myeloproliferative disorder. In further embodiments, at least one 5-LO inhibitor and at least one additional therapeutic agent are administered to a subject to treat a myeloproliferative disorder. Methods of inhibiting leukemia stem cells are provided according to embodiments of the present invention which include contacting leukemia stem cells with an effective amount of an arachidonate 5-lipoxygenase inhibitor.