JAK PI3K/mTOR COMBINATION THERAPY

Priority Benefit

This application claims the benefit of U.S. Provisional Application No.

61/522,001 filed on August 10, 2011, the contents of which are hereby incorporated herein in its entirety. The contents of any patents, patent applications, and references cited throughout this specification are hereby incorporated by reference in their entireties.

Background

Cancer is a major cause of death in the United States. Although "cancer" is used to describe many different types of cancer, e.g., breast, prostate, lung, colon, and pancreatic, each type of cancer differs both at the phenotypic level and the genetic level. The unregulated growth characteristic of cancer occurs when the expression of one or more genes becomes disregulated due to mutations, and cell growth can no longer be controlled.

Myeloproliferative neoplasms (MPNs) are a group of cancers that cause an overproduction of blood cells (platelets, white blood cells and red blood cells) in the bone marrow. MPNs include polycythemia vera (PV), primary or essential

thrombocythemia (ET), primary or idiopathic myelofibrosis, chronic myelogenous (myelocytic) leukemia (CML), chronic neutrophilic leukemia (CNL), juvenile

myelomonocytic leukemia (JML) and chronic eosinophilic leukemia (CEL)/hyper eosinophilic syndrome (HES). These disorders are grouped together because they share some or all of the following features: involvement of a multipotent hematopoietic progenitor cell, dominance of the transformed clone over the non-transformed

hematopoietic progenitor cells, overproduction of one or more hematopoietic lineages in the absence of a definable stimulus, growth factor-independent colony formation in vitro, marrow hypercellularity, megakaryocyte hyperplasia and dysplasia, abnormalities predominantly involving chromosomes 1, 8, 9, 13, and 20, thrombotic and hemorrhagic diatheses, exuberant extramedullary hematopoiesis, and spontaneous transformation to acute leukemia or development of marrow fibrosis but at a low rate, as compared to the rate in CML. The incidence of MPNs varies widely, ranging from approximately 3 per 100,000 individuals older than 60 years annually for CML to 0.13 per 100,000 children from birth to 14 years annually for JML (Vardiman JW et al, Blood 100 (7): 2292-302, 2002).

Accordingly, there remains a need for new treatments of MPNs, as well as other cancers such as solid tumors.

Summary of the Invention

Provided herein is a combination therapy comprising a compound of the formula

I:

(I)

including stereoisomers, tautomers, racemates, solvates, metabolites, and

pharmaceutically acceptable salts thereof,

and a compound of the formula II:

including tautomers, hydrates, solvates, and pharmaceutically acceptable salts thereof.

In a particular embodiment, the compound of formula I is (3R)-3-cyclopentyl-3- [4-(7H-pyrrolo[2,3-d]pyrimidin-4-yl)-lH-pyrazol-l-yl]propane nitrile, or a

pharmaceutically acceptable salt thereof. In another particular embodiment, the compound of formula II is 2-methyl-2-[4-(3-methyl-2-oxo-8-quinolin-3-yl-2,3-dihydro- imidazo[4,5-c]quinolin-l-yl)-phenyl]-propionitrile. The combination therapy is useful for the treatment of a variety of cancers, including MPNs and solid tumors. The combination therapy is also useful for the treatment of any number of JAK-associated diseases, as well as diseases that can be treated through the dual inhibition of PDK/mTOR.

In one embodiment, provided herein is a combination therapy comprising a JAK inhibitor of the formula I, as well as a dual PDK/mTOR inhibitor of the formula II. In one embodiment, the JAK inhibitor is (3R)-3-cyclopentyl-3-[4-(7H-pyrrolo[2,3- d]pyrimidin-4-yl)-lH-pyrazol-l-yl]propanenitrile, and the dual PDK/mTOR inhibitor is 2-methyl-2-[4-(3-methyl-2-oxo-8-quinolin-3-yl-2,3-dihydro-im idazo[4,5-c]quinolin-l- yl) -phenyl] -propionitrile. As such, in one aspect, provided herein is a pharmaceutical composition comprising (3R)-3-cyclopentyl-3-[4-(7H-pyrrolo[2,3-d]pyrimidin-4-yl)-lH - pyrazol-l-yl]propanenitrile or salts thereof and 2-methyl-2-[4-(3-methyl-2-oxo-8- quinolin-3-yl-2,3-dihydro-imidazo[4,5-c]quinolin-l-yl)-pheny l]-propionitrile, or pharmaceutically acceptable salts thereof and a pharmaceutically acceptable carrier.

In another embodiment of the combination therapy, the JAK inhibitor is (3R)-3- cyclopentyl-3-[4-(7H-pyrrolo[2,3-d]pyrimidin-4-yl)-lH-pyrazo l-l-yl]propanenitrile phosphoric acid salt. Accordingly, in one embodiment provided herein is a combination therapy comprising the JAK inhibitor, (3R)-3-cyclopentyl-3-[4-(7H-pyrrolo[2,3- d]pyrimidin-4-yl)-lH-pyrazol-l-yl]propanenitrile phosphoric acid salt and the dual PDK/mTOR inhibitor, 2-methyl-2-[4-(3-methyl-2-oxo-8-quinolin-3-yl-2,3-dihydro- imidazo[4,5-c]quinolin-l-yl)-phenyl]-propionitrile or a pharmaceutically acceptable salt thereof.

In one embodiment of the combination therapy, the compound of formula I and the compound of formula II can be in a single formulation or unit dosage form. The single formulation or unit dose form can further comprise a pharmaceutically acceptable carrier.

In another aspect, provided herein is a method of treating cancer in a subject in need thereof comprising administering to the subject an effective amount of a compound of formula I and a compound of formula II. The cancer to be treated can be a myeloproliferative neoplasm. Examples of myeloproliferative neoplasms include those selected from the group consisting of chronic myeloid leukemia (CML), polycythemia vera (PV), essential thrombocythemia (ET), primary or idiopathic myelofibrosis (PMF), chronic neutrophilic leukemia, chronic eosinophilic leukemia, chronic myelomonocytic leukemia, juvenile myelomonocytic leukemia, hypereosinophilic syndrome, systemic mastocytosis, and atypical chronic myelogenous leukemia.

In one embodiment of the cancer treatment, the cancer is a solid tumor.

Examples of solid tumors to be treated include tumors of the brain, kidney, liver, adrenal gland, bladder, breast, stomach, gastric area, ovaries, colon, rectum, prostate, pancreas, lung, vagina, thyroid, neck or head.

In another embodiment, the cancer to be treated is Waldenstrom's

macroglobulinemia.

In another embodiment of the methods provided herein, the subject is human. When used in these methods, the compound of formula I and the compound of formula II can be in a single formulation or unit dosage form. In other embodiments of the methods, the compound of formula I and the compound of formula II are in separate formulations or unit dosage forms. Alternatively, the treatment comprises administering the compound of formula I and the compound of formula II at substantially the same time. In still another embodiment, treatment can comprise administering compound of formula I and the compound of formula II at different times. In another embodiment, the compound of formula I is administered to the subject, followed by administration of the compound of formula II. Alternatively, the compound of formula II is administered to the subject, followed by administration of the compound of formula I.

In another embodiment, the compound of formula I and/or compound of formula

II is administered at dosages that would not be effective when one or both of the compound of formula I and the compound of formula II is administered alone, but which amounts are effective in combination. Detailed Description

It has been discovered that administering a combination of a JAK kinase inhibitor (e.g. , a compound of formula I) and a dual PDK/mTOR inhibitor (e.g. , a compound of formula II) provides surprising, synergistic effects for treating cancer, e.g. , myeloproliferative neoplasms (MPNs) and solid tumors, in a subject. Such an approach, combination or co-administration of the two types of agents, can be useful for treating individuals suffering from cancer who do not respond to or are resistant to currently- available therapies. The combination therapy provided herein is also useful for improving the efficacy and/or reducing the side effects of currently- available cancer therapies for individuals who do respond to such therapies.

Certain terms used herein are described below. Compounds of the present invention are described using standard nomenclature. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as is commonly understood by one of skill in the art to which this invention belongs.

JAK Inhibitor / PI3K/mTOR Combination

Provided herein is a combination of therapeutic agents and administration methods for the combination of agents to treat cancer, e.g., MPNs and solid tumors. As used herein, a "combination of agents" and similar terms refer to a combination of two types of agents: (1) a JAK inhibitor of the formula I, and (2) a dual PI3K/mTOR inhibitor of the formula II.

The JAK family plays a role in the cytokine-dependent regulation of proliferation and function of cells involved in immune response. Currently, there are four known mammalian JAK family members: JAK1 (also known as Janus kinase- 1), JAK2 (also known as Janus kinase-2), JAK3 (also known as Janus kinase, leukocyte; JAKL; L-JAK and Janus kinase-3) and TYK2 (also known as protein-tyro sine kinase 2). The JAK proteins range in size from 120 to 140 kDa and comprise seven conserved JAK homology (JH) domains; one of these is a functional catalytic kinase domain, and another is a pseudokinase domain potentially serving a regulatory function and/or serving as a docking site for STATs (Scott, M. J., C. J. Godshall, et al. (2002) Clin. Diagn. Lab Immunol. 9(6): 1153-9).

As used herein, a "JAK inhibitor" refers to a compound or a ligand that inhibits at least one activity of a JAK kinase. A "JAK inhibitor" can also be a "JAK1/JAK2 inhibitor." In certain embodiments, the JAK inhibitor induces a JAK-inhibited state. An example of a JAK inhibitor is a compound of formula I.

The compounds of formula I are defined as follows:

(I)

including stereoisomers, tautomers, racemates, solvates, metabolites, and pharmaceutically acceptable salts thereof,

wherein

1 2 3

R\ IT and R ^J are independently selected from H, halo, and Ci_4 alkyl; and Z is C3-6 cycloalkyl (e.g. , cyclopentyl).

Examples of compounds of formula I include the compounds described in U.S. Patent Application No. 12/137,892, U.S. Patent Application No. 12/687,623 and U.S. Patent No. 7,598,257, all of which are incorporated herein by reference in their entireties.

In a particular embodiment, the compound of formula I is 3-cyclopentyl-3-[4- (7H-pyrrolo[2,3-d]pyrimidin-4-yl)-lH-pyrazol- l-yl]propanenitrile or a pharmaceutically acceptable salt thereof. In another embodiment, the compound of formula I is (3R)-3- cyclopentyl-3-[4-(7H-pyrrolo[2,3-d]pyrimidin-4-yl)-lH-pyrazo l- l-yl]propanenitrile or a pharmaceutically acceptable salt thereof. In still another embodiment, the compound of formula I is (3S)-3-cyclopentyl-3-[4-(7H-pyrrolo[2,3-d]pyrimidin-4-yl)-lH -pyrazol- l- yl]propanenitrile or a pharmaceutically acceptable salt thereof. The synthesis of these compounds are described in, for example, U.S. Patent No. 7,598,257, and in U.S. Patent Application No. 12/687,623, both of which are incorporated herein by reference in its entirety.

In another embodiment, the compound of formula I is (3R)-3-cyclopentyl-3-[4- (7H-pyrrolo[2,3-d]pyrimidin-4-yl)-lH-pyrazol- l-yl]propanenitrile maleic acid salt. In still another embodiment, the compound of formula I is (3R)-3-cyclopentyl-3-[4-(7H- pyrrolo[2,3-d]pyrimidin-4-yl)- lH-pyrazol-l-yl]propanenitrile sulfuric acid salt. In yet another embodiment, the compound is of formula I is (3R)-3-cyclopentyl-3-[4-(7H- pyrrolo[2,3-d]pyrimidin-4-yl)- lH-pyrazol-l-yl]propanenitrile phosphoric acid salt. The synthesis of these compounds are described in, for example, U.S. Patent Application No. 12/137,892, which is incorporated herein by reference in its entirety. Phosphatidylinositol (PI) is a phospholipid that is found in cell membranes. This phospoholipid plays an important role also in intracellular signal transduction.

Phosphatidylinositol-3 kinase (PI3K) has been identified as an enzyme that

phosphorylates the 3-position of the inositol ring of phosphatidylinositol [D. Whitman et ah, Nature, 332, 664 (1988)].

Mammalian Target of Rapamycin (mTOR), is a cell- signaling protein that regulates the response of tumor cells to nutrients and growth factors, as well as controlling tumor blood supply through effects on Vascular Endothelial Growth Factor, (VEGF). Inhibitors of mTOR starve cancer cells and shrink tumors by inhibiting the effect of mTOR, which is a downstream mediator of the PDK/Akt pathway. The

PI3K/Akt pathway is thought to be over- activated in numerous cancers and may account for the widespread response from various cancers to mTOR inhibitors. Over- activation of the PDK/Akt kinase pathway is frequently associated with mutations in the PTEN gene, which is common in many cancers and may help predict what tumors will respond to mTOR inhibitors.

The efficacy of a dual PI3K/mTOR inhibitor has been described, for example, in Mol. Cancer Ther., 7(7): 1851-1863 (July 2008) and PNAS, 106(52): 22299-22304 (December 29, 2009).

Compounds of formula II, having the structure provided below, are dual

PI3K/mTOR inhibitors:

including tautomers, hydrates, solvates, and pharmaceutically acceptable salts thereof, wherein

R _la is phenyl wherein said phenyl is substituted by one or two substituents independently selected from the group consisting of halogen; C _1-4 alkyl unsubstituted or substituted by halogen, cyano, imidazolyl or triazolyl; C ₃ _ ₆ cycloalkyl; amino substituted by one or two substituents independently selected from the group consisting of Ci_4 alkyl, Ci_4 alkyl sulfonyl, and Ci_4 alkoxy; piperazinyl unsubstituted or substituted by one or two substituents independently selected from the group consisting of Ci_4 alkyl and C _1-4 alkyl sulfonyl; 2-oxo-pyrrolidinyl; imidazolyl; pyrazolyl; and triazolyl;

R _2a is O or S;

R _3a is C _1-4 alkyl;

R _4a is pyridyl unsubstituted or substituted by halogen, cyano, Ci_4 alkyl, C _1-4 alkoxy or piperazinyl unsubstituted or substituted by C _1-4 alkyl; pyrimidinyl unsubstituted or substituted by C _1-4 alkyl; quinolinyl unsubstituted or substituted by halogen; or quinoxalinyl;

R _5a is hydrogen or halogen;

n is 0 or 1, wherein if n=l, the N-atom bearing the radical R ₆ has a positive charge;

R _6a is oxido; and

R _7a is hydrogen or amino.

In a particular embodiment, the compound of formula II is of the formula Ila:

(Ha)

including tautomers, hydrates, solvates, and pharmaceutically acceptable salts thereof,

wherein

R _la is phenyl wherein said phenyl is substituted by one or two substituents independently selected from the group consisting of halogen; C _1-4 alkyl unsubstituted or substituted by halogen, cyano, imidazolyl or triazolyl; and piperazinyl unsubstituted or substituted by one or two substituents independently selected from the group consisting of Ci-4 alkyl and C _1-4 alkyl sulfonyl;

R _2a is O;

R _3a is C _1-4 alkyl;

R _4a is quinolinyl unsubstituted or substituted by halogen;

R _5a is hydrogen;

and R _7a is hydrogen.

In one embodiment, the compound of formula II has a structure including tautomers, hydrates, solvates, and pharmaceutically acceptable salts thereof,

wherein:

R _la is phenyl wherein said phenyl is substituted by C _1-4 alkyl unsubstituted or substituted by halogen, cyano, imidazolyl or triazolyl;

R _2a is O;

R _3a is Ci-4 alkyl;

R _4a is quinolinyl unsubstituted or substituted by halogen;

R _5a is hydrogen;

n is 0; and

R _7a is hydrogen.

In another embodiment, the compound of formula II is 2-methyl-2-[4-(3-methyl- 2-oxo-8-quinolin-3-yl-2,3-dihydro-imidazo[4,5-c]quinolin-l-y l)-phenyl]-propionitrile, and pharmaceutically acceptable salts thereof. In still another embodiment, the compound of Formula II is the monotosylate salt of 2-methyl-2-[4-(3-methyl-2-oxo-8- quinolin-3-yl-2,3-dihydro-imidazo[4,5-c]quinolin-l-yl)-pheny l]-propionitrile. These compounds, as well as other compounds of formula II, are described in

WO/2006/122806, as well as WO/2008/103636, each of which are incorporated herein by reference in their entireties.

As used herein, the term "alkyl" refers to a fully saturated branched or unbranched hydrocarbon moiety. Preferably the alkyl comprises 1 to 20 carbon atoms, more preferably 1 to 16 carbon atoms, 1 to 10 carbon atoms, 1 to 7 carbon atoms, 1 to 6 carbons, 1 to 4 carbons, or 1 to 3 carbon atoms. Representative examples of alkyl include, but are not limited to, methyl, ethyl, w-propyl, isopropyl, w-butyl, sec-butyl, isobutyl, iert-butyl, w-pentyl, isopentyl, neopentyl, w-hexyl, 3-methylhexyl, 2,2- dimethylpentyl, 2,3-dimethylpentyl, w-heptyl, w-octyl, w-nonyl, w-decyl and the like. Furthermore, the expression "C _x -C _y -alkyl", wherein x is 1-5 and y is 2-10 indicates a particular alkyl group (straight- or branched-chain) of a particular range of carbons. For example, the expression Ci-C ₄ -alkyl includes, but is not limited to, methyl, ethyl, propyl, butyl, isopropyl, tert-butyl and isobutyl.

As used herein, the term "cycloalkyl" refers to saturated or unsaturated monocyclic, bicyclic or tricyclic hydrocarbon groups of 3-12 carbon atoms, preferably 3-9, or 3-6 carbon atoms. Exemplary monocyclic hydrocarbon groups include, but are not limited to, cyclopropyl, cyclobutyl, cyclopentyl, cyclopentenyl, cyclohexyl and cyclohexenyl and the like. Exemplary bicyclic hydrocarbon groups include bornyl, indyl, hexahydroindyl, tetrahydronaphthyl, decahydronaphthyl, bicyclo[2.1.1]hexyl, bicyclo[2.2.1]heptyl, bicyclo[2.2.1]heptenyl, 6,6-dimethylbicyclo[3.1.1]heptyl, 2,6,6- trimethylbicyclo[3.1.1]heptyl, bicyclo[2.2.2]octyl and the like. Exemplary tricyclic hydrocarbon groups include adamantyl and the like.

The term "halogen" or "halo" refers to chloro, bromo, fluoro, and iodo groups. The term "amino" as used herein unless otherwise specified, includes a moiety represented by the structure "-NR ₂ ", and includes primary, secondary and tertiary amines optionally substituted by alkyl, alkoxy, aryl, heterocyclyl, alkyl sulfonyl and/or sulfonyl groups. For example, R ₂ may represent two hydrogen atoms, two alkyl moieties, or one hydrogen and one alkyl moiety.

Agents may contain one or more asymmetric elements such as stereogenic centers or stereogenic axes, e.g., asymmetric carbon atoms, so that the compounds can exist in different stereoisomeric forms. These compounds can be, for example, racemates or optically active forms. For compounds with two or more asymmetric elements, these compounds can additionally be mixtures of diastereomers. For compounds having asymmetric centers, it should be understood that all of the optical isomers and mixtures thereof are encompassed. In addition, compounds with carbon- carbon double bonds may occur in Z- and E-forms; all isomeric forms of the compounds are included in the present invention. In these situations, the single enantiomers

(optically active forms) can be obtained by asymmetric synthesis, synthesis from optically pure precursors, or by resolution of the racemates. Resolution of the racemates can also be accomplished, for example, by conventional methods such as crystallization in the presence of a resolving agent, or chromatography, using, for example a chiral HPLC column.

Unless otherwise specified, or clearly indicated by the text, reference to compounds useful in the combination therapy of the invention includes both the free base of the compounds, and all pharmaceutically acceptable salts of the compounds.

As used herein, the term "pharmaceutically acceptable salts" refers to the nontoxic acid or alkaline earth metal salts of the pyrimidine compounds of the invention. These salts can be prepared in situ during the final isolation and purification of the pyrimidine compounds, or by separately reacting the base or acid functions with a suitable organic or inorganic acid or base, respectively. Representative salts include, but are not limited to, the following: acetate, adipate, alginate, citrate, aspartate, benzoate, benzenesulfonate, bisulfate, butyrate, camphorate, camphorsulfonate, digluconate, cyclopentanepropionate, dodecylsulfate, ethanesulfonate, glucoheptanoate,

glycerophosphate, hemi-sulfate, heptanoate, hexanoate, fumarate, hydrochloride, hydrobromide, hydroiodide, 2-hydroxyethanesulfonate, lactate, maleate,

methanesulfonate, nicotinate, 2-naphth-alenesulfonate, oxalate, pamoate, pectinate, persulfate, 3-phenylproionate, phosphate, picrate, pivalate, propionate, succinate, sulfate, tartrate, thiocyanate, p-toluenesulfonate, and undecanoate. Also, the basic nitrogen- containing groups can be quaternized with such agents as alkyl halides, such as methyl, ethyl, propyl, and butyl chloride, bromides, and iodides; dialkyl sulfates like dimethyl, diethyl, dibutyl, and diamyl sulfates, long chain halides such as decyl, lauryl, myristyl, and stearyl chlorides, bromides and iodides, aralkyl halides like benzyl and phenethyl bromides, and others. Water or oil-soluble or dispersible products are thereby obtained.

Examples of acids that may be employed to form pharmaceutically acceptable acid addition salts include such inorganic acids as hydrochloric acid, hydrobromic acid, nitric acid, sulfuric acid and phosphoric acid and such organic acids as formic acid, acetic acid, trifluoroacetic acid, fumaric acid, tartaric acid, oxalic acid, maleic acid, methanesulfonic acid, succinic acid, malic acid, methanesulfonic acid, benzenesulfonic acid, and p-toluenesulfonic acid, citric acid, and acidic amino acids such as aspartic acid and glutamic acid.

Basic addition salts can be prepared in situ during the final isolation and purification of the pyrimidine compounds, or separately by reacting carboxylic acid moieties with a suitable base such as the hydroxide, carbonate or bicarbonate of a pharmaceutically acceptable metal cation or with ammonia, or an organic primary, secondary or tertiary amine. Pharmaceutically acceptable salts include, but are not limited to, cations based on the alkali and alkaline earth metals, such as sodium, lithium, potassium, calcium, magnesium, aluminum salts and the like, as well as nontoxic ammonium, quaternary ammonium, and amine cations, including, but not limited to ammonium, tetramethylammonium, tetraethylammonium, methylamine, dimethylamine, trimethylamine, triethylamine, ethylamine, and the like. Other representative organic amines useful for the formation of base addition salts include diethylamine, ethylenediamine, ethanolamine, diethanolamine, piperazine, pyridine, picoline, triethanolamine and the like, and basic amino acids such as arginine, lysine and ornithine.

Provided herein is a combination therapy comprising a JAK inhibitor of the formula I and a PBK/mTOR inhibitor of the formula II. Administration of the combination includes administration of the combination in a single formulation or unit dosage form, administration of the individual agents of the combination concurrently but separately, or administration of the individual agents of the combination sequentially by any suitable route. The dosage of the individual agents of the combination may require more frequent administration of one of the agent(s) as compared to the other agent(s) in the combination. Therefore, to permit appropriate dosing, packaged pharmaceutical products may contain one or more dosage forms that contain the combination of agents, and one or more dosage forms that contain one of the combinations of agents, but not the other agent(s) of the combination.

The term "combination therapy" refers to the administration of two or more therapeutic agents to treat a therapeutic condition or disorder described in the present disclosure. Such administration encompasses co-administration of these therapeutic agents in a substantially simultaneous manner, such as in a single capsule having a fixed ratio of active ingredients or in multiple, or in separate containers (e.g. , capsules) for each active ingredient. In addition, such administration also encompasses use of each type of therapeutic agent in a sequential manner, either at approximately the same time or at different times. In either case, the treatment regimen will provide beneficial effects of the drug combination in treating the conditions or disorders described herein

The term "single formulation" as used herein refers to a single carrier or vehicle formulated to deliver effective amounts of both therapeutic agents to a patient. The single vehicle is designed to deliver an effective amount of each of the agents, along with any pharmaceutically acceptable carriers or excipients. In some embodiments, the vehicle is a tablet, capsule, pill, or a patch. In other embodiments, the vehicle is a solution or a suspension.

The term "unit dose" is used herein to mean simultaneous administration of both agents together, in one dosage form, to the patient being treated. In some embodiments, the unit dose is a single formulation. In certain embodiments, the unit dose includes one or more vehicles such that each vehicle includes an effective amount of at least one of the agents along with pharmaceutically acceptable carriers and excipients. In some embodiments, the unit dose is one or more tablets, capsules, pills, or patches

administered to the patient at the same time.

The term "treat" is used herein to mean to relieve, reduce or alleviate, at least one symptom of a disease in a subject. Within the meaning of the present invention, the term "treat" also denotes, to arrest, delay the onset (i.e., the period prior to clinical manifestation of a disease or symptom of a disease) and/or reduce the risk of developing or worsening a symptom of a disease.

The term "subject" is intended to include animals. Examples of subjects include mammals, e.g., humans, dogs, cows, horses, pigs, sheep, goats, cats, mice, rabbits, rats, and transgenic non-human animals. In certain embodiments, the subject is a human, e.g., a human suffering from, at risk of suffering from, or potentially capable of suffering from cancer, e.g., myeloproliferative neoplasms or solid tumors.

The term "about" or "approximately" usually means within 20%, more preferably within 10%, and most preferably still within 5% of a given value or range. Alternatively, especially in biological systems, the term "about" means within about a log (i.e., an order of magnitude) preferably within a factor of two of a given value.

The combination of agents described herein display a synergistic effect. The term "synergistic effect" as used herein, refers to action of two agents such as, for example, a JAK inhibitor of the formula I and a PBK/mTOR inhibitor of the formula II, producing an effect, for example, slowing the symptomatic progression of cancer or symptoms thereof, which is greater than the simple addition of the effects of each drug administered by themselves. A synergistic effect can be calculated, for example, using suitable methods such as the Sigmoid-Emax equation (Holford, N. H. G. and Scheiner, L.

B., Clin. Pharmacokinet. 6: 429-453 (1981)), the equation of Loewe additivity (Loewe, S. and Muischnek, H., Arch. Exp. Pathol. Pharmacol. 114: 313-326 (1926)) and the median-effect equation (Chou, T. C. and Talalay, P., Adv. Enzyme Regul. 22: 27-55

(1984)). Each equation referred to above can be applied to experimental data to generate a corresponding graph to aid in assessing the effects of the drug combination. The corresponding graphs associated with the equations referred to above are the

concentration-effect curve, isobologram curve and combination index curve,

respectively.

An "effective amount" of a combination of agents (i.e., a JAK inhibitor of the formula I and a PI3K/mTOR inhibitor of the formula II) is an amount sufficient to provide an observable improvement over the baseline clinically observable signs and symptoms of the depressive disorder treated with the combination.

An "oral dosage form" includes a unit dosage form prescribed or intended for oral administration.

Methods of Treatment Using a Combination of a Formula I J AK Inhibitor and a Formula II PI3K/mTOR Inhibitor

Provided herein are methods of treating cancer, e.g., myeloproliferative neoplasms and solid tumors, using the combination therapy treatment described above.

As used herein, "cancer" refers to any disease that is caused by or results in inappropriately high levels of cell division, inappropriately low levels of apoptosis, or both. Examples of cancer include, without limitation, leukemias (e.g., acute leukemia, acute lymphocytic leukemia, acute myelocytic leukemia, acute myeloblastic leukemia, acute promyelocytic leukemia, acute myelomonocytic leukemia, acute monocytic leukemia, acute erythroleukemia, chronic leukemia, chronic myelocytic leukemia, chronic lymphocytic leukemia), polycythemia vera, lymphoma (Hodgkin's disease, non- Hodgkin's disease), Waldenstrom's macroglobulinemia, heavy chain disease, and solid tumors.

Furthermore, the combination therapy provided herein relates to a

pharmaceutical composition for treatment of solid or liquid tumors in warm-blooded animals, including humans, comprising an antitumor-effective dose of compounds of the combination as described above.

The combination therapy provided herein can be used in the treatment of solid tumors such as sarcomas and carcinomas (e.g., fibrosarcoma, myxosarcoma, liposarcoma, chondrosarcoma, osteogenic sarcoma, chordoma, angiosarcoma, endothelio sarcoma, lymphangio sarcoma, lymphangioendothelio sarcoma, synovioma, mesothelioma, Ewing's tumor, leiomyo sarcoma, rhabdomyosarcoma, colon carcinoma, pancreatic cancer, breast cancer, ovarian cancer, prostate cancer, squamous cell carcinoma, basal cell carcinoma, adenocarcinoma, sweat gland carcinoma, sebaceous gland carcinoma, papillary carcinoma, papillary adenocarcinomas, cystadenocarcinoma, medullary carcinoma, bronchogenic carcinoma, renal cell carcinoma, hepatoma, nile duct carcinoma, choriocarcinoma, seminoma, embryonal carcinoma, Wilm's tumor, cervical cancer, uterine cancer, testicular cancer, lung carcinoma, small cell lung carcinoma, bladder carcinoma, epithelial carcinoma, glioma, astrocytoma,

medulloblastoma, crailiopharyngioma, ependymoma, pinealoma, hemangioblastoma, acoustic neuroma, oligodenroglioma, schwamioma, meningioma, melanoma, neuroblastoma, and retinoblastoma).

In a certain embodiment, the cancer that can be treated using the combination provided herein is a myeloproliferative disoder. Myeloproliferative disorders (MPDs), now commonly referred to as meyloproliferative neoplasms (MPNs), are in the class of haematological malignancies that are clonal disorders of hematopoietic progenitors. Tefferi, A. and Vardiman, J. W., Classification and diagnosis of myeloproliferative neoplasms: The 2008 World Health Organization criteria and point-of-care diagnostic algorithms, Leukemia, September 2007, 22: 14-22, is hereby incorporated by reference. They are characterized by enhanced proliferation and survival of one or more mature myeloid lineage cell types. This category includes but is not limited to, chronic myeloid leukemia (CML), polycythemia vera (PV), essential thrombocythemia (ET), primary or idiopathic myelofibrosis (PMF), chronic neutrophilic leukemia, chronic eosinophilic leukemia, chronic myelomonocytic leukemia, juvenile myelomonocytic leukemia, hypereosinophilic syndrome, systemic mastocytosis, and atypical chronic myelogenous leukemia. Tefferi, A. and Gilliland, D. G., Oncogenes in myeloproliferative disorders, Cell Cycle. March 2007, 6(5): 550-566 is hereby fully incorporated by reference in its entirety for all purposes.

In another embodiment, the combination therapy provided herein is useful for the treatment of primary myelofibrosis, post-polycythemia vera myelofibrosis, post-essential thrombocythemia myelofibrosis, and secondary acute myelogenous leukemia.

In some embodiments, the subject to be treated {e.g., a human) is determined to be non-responsive or resistant to one or more therapies for myeloproliferative disorders.

In a particular embodiment, provided herein is a method of treating a

myeloproliferative neoplasm in a subject in need thereof, comprising administering to the subject an effective amount of (3R)-3-cyclopentyl-3-[4-(7H-pyrrolo[2,3- d]pyrimidin-4-yl)-lH-pyrazol-l-yl]propanenitrile, or a pharmaceutically acceptable salt thereof, and 2-methyl-2-[4-(3-methyl-2-oxo-8-quinolin-3-yl-2,3-dihydro-im idazo[4,5- c]quinolin-l-yl)-phenyl]-propionitrile, or a pharmaceutically acceptable salt thereof. When used in these methods, the compound of formula I and the compound of formula II can be in a single formulation or unit dosage form. In other embodiments of the methods, the compound of formula I and the compound of formula II are in separate formulations or unit dosage forms.

In a particular embodiment, provided herein is a method of treating a solid tumor in a subject in need thereof, comprising administering to the subject an effective amount of a composition comprising (3R)-3-cyclopentyl-3-[4-(7H-pyrrolo[2,3-d]pyrimidin-4- yl)-lH-pyrazol-l-yl]propanenitrile, or a pharmaceutically acceptable salt thereof, and 2- methyl-2-[4-(3-methyl-2-oxo-8-quinolin-3-yl-2,3-dihydro-imid azo[4,5-c]quinolin-l-yl)- phenyl]-propionitrile, or a pharmaceutically acceptable salt thereof. When used in these methods, the compound of formula I and the compound of formula II can be in a single formulation or unit dosage form. In other embodiments of the methods, the compound of formula I and the compound of formula II are in separate formulations or unit dosage forms.

Furthermore, the invention relates to a method for the treatment of a proliferative disease which responds to an inhibition of lipid kinases and/or PI3-kinase-related protein kinases, in particular the PI3 kinase, and/or DNA protein kinase activity, which comprises administering a combination of a compound of formula I and a compound of formula II, in a quantity effective against the said disease, to a warmblooded animal, in particular to humans, requiring such treatment.

Preferred diseases that respond to an inhibition of lipid kinases and/or PI3- kinase-related protein kinases are those proliferative diseases selected from a benign or malignant tumor, carcinoma of the brain, kidney, liver, adrenal gland, bladder, breast, stomach, gastric tumors, ovaries, colon, rectum, prostate, pancreas, lung, vagina or thyroid, sarcoma, glioblastomas, multiple myeloma or gastrointestinal cancer, especially colon carcinoma or colorectal adenoma or a tumor of the neck and head, an epidermal hyperproliferation, psoriasis, prostate hyperplasia, a neoplasia, a neoplasia of epithelial character, lymphomas, a mammary carcinoma or a leukemia. Other diseases include Cowden syndrome, Lhermitte-Dudos disease and Bannayan-Zonana syndrome, or diseases in which the PI3K/PKB pathway is aberrantly activated.

In one embodiment, provided herein are methods of treating a JAK-associated disease or disorder in a subject (e.g. , patient) by administering to the individual in need of such treatment a therapeutically effective amount or dose of a combination of the present invention or a pharmaceutical composition thereof. A JAK-associated disease can include any disease, disorder or condition that is directly or indirectly linked to expression or activity of the JAK, including over-expression and/or abnormal activity levels. A JAK-associated disease can also include any disease, disorder or condition that can be prevented, ameliorated, or cured by modulating JAK activity.

Examples of JAK-associated diseases include diseases involving the immune system including, for example, organ transplant rejection (e.g. , allograft rejection and graft versus host disease).

Further examples of JAK-associated diseases include autoimmune diseases such as multiple sclerosis, rheumatoid arthritis, juvenile arthritis, type I diabetes, lupus, psoriasis, inflammatory bowel disease, ulcerative colitis, Crohn's disease, myasthenia gravis, immunoglobulin nephropathies, autoimmune thyroid disorders, and the like. In some embodiments, the autoimmune disease is an autoimmune bullous skin disorder such as pemphigus vulgaris (PV) or bullous pemphigoid (BP).

Further examples of JAK-associated diseases include allergic conditions such as asthma, food allergies, atopic dermatitis and rhinitis. Further examples of JAK- associated diseases include viral diseases such as Epstein Barr Virus (EBV), Hepatitis B, Hepatitis C, HIV, HTLV 1, Varicella-Zoster Virus (VZV) and Human Papilloma Virus (HPV).

Further examples of JAK-associated diseases or conditions include skin disorders such as psoriasis (for example, psoriasis vulgaris), atopic dermatitis, skin rash, skin irritation, skin sensitization (e.g. , contact dermatitis or allergic contact dermatitis). For example, certain substances including some pharmaceuticals when topically applied can cause skin sensitization. In some embodiments, the skin disorder is treated by topical administration of at least one JAK inhibitor of the invention.

In further embodiments, the JAK-associated disease is cancer including those characterized by solid tumors (e.g. , prostate cancer, renal cancer, hepatic cancer, pancreatic cancer, gastric cancer, breast cancer, lung cancer, cancers of the head and neck, thyroid cancer, glioblastoma, Kaposi's sarcoma, Castleman's disease, melanoma etc.), hematological cancers (e.g. , lymphoma, leukemia such as acute lymphoblastic leukemia, or multiple myeloma), and skin cancer such as cutaneous T-cell lymphoma (CTCL) and cutaneous B-cell lymphoma. Example cutaneous T-cell lymphomas include Sezary syndrome and mycosis fungoides. JAK-associated diseases can further include those characterized by expression of a mutant JAK2 such as those having at least one mutation in the pseudo-kinase domain (e.g. , JAK2V617F).

JAK-associated diseases can further include myeloproliferative disorders

(MPDs) such as polycythemia vera (PV), essential thrombocythemia (ET), myeloid metaplasia with myelofibrosis (MMM), chronic myelogenous leukemia (CML), chronic myelomonocytic leukemia (CMML), hypereosinophilic syndrome (HES), systemic mast cell disease (SMCD), and the like.

Further JAK-associated diseases include inflammation and inflammatory diseases. Example inflammatory diseases include inflammatory diseases of the eye (e.g. , iritis, uveitis, scleritis, conjunctivitis, or related disease), inflammatory diseases of the respiratory tract (e.g. , the upper respiratory tract including the nose and sinuses such as rhinitis or sinusitis or the lower respiratory tract including bronchitis, chronic obstructive pulmonary disease, and the like), inflammatory myopathy such as myocarditis, and other inflammatory diseases.

The combination therapy described herein can further be used to treat ischemia reperfusion injuries or a disease or condition related to an inflammatory ischemic event such as stroke or cardiac arrest. The combination therapy described herein can further be used to treat anorexia, cachexia, or fatigue such as that resulting from or associated with cancer. The combination therapy described herein can further be used to treat restenosis, sclerodermitis, or fibrosis. The combination therapy described herein can further be used to treat conditions associated with hypoxia or astrogliosis such as, for example, diabetic retinopathy, cancer, or neurodegeneration. See, e.g. , Dudley, A. C. et al. Biochem. J. 2005, 390(Pt 2):427-36 and Sriram, K. et al. J. Biol. Chem. 2004, 279(19): 19936-47. Epub 2004 Mar 2.

Provided herein are methods of treating disease, e.g. , a myeloproliferative disorder, by administering an effective amount of a compound of a dual action

PI3K/mTOR inhibitor and a JAK inhibitor to an individual suffering from a disease. The amount of the combination of agents is effective to treat the disease. It is important to note the synergistic effects of the combination of agents: even though one or more of the agents administered alone at a particular dosage may not be effective, when administered in combination, at the same dosage of each agent, the treatment is effective. The doses of the one or more of the agents in the combination therefore can be less than the FDA approved doses of each agent.

The pharmaceutical compositions or combinations provided herein (i.e. , a JAK inhibitor of the formula I and a dual PBK/mTOR inhibitor of the formula II) can be tested in clinical studies. Suitable clinical studies may be, for example, open label, dose escalation studies in patients with proliferative diseases. Such studies prove in particular the synergism of the active ingredients of the combination of the invention. The beneficial effects on proliferative diseases may be determined directly through the results of these studies which are known as such to a person skilled in the art. Such studies may, in particular, be suitable to compare the effects of a monotherapy using the active ingredients and a combination of the invention. In one embodiment, the dose of a compound of formula I is escalated until the Maximum Tolerated Dosage is reached, and the compound of formula I is administered with a fixed dose. Alternatively, the compound of formula II may be administered in a fixed dose and the dose of the compound of formula I may be escalated. Each patient may receive doses of the compounds either daily or intermittently. The efficacy of the treatment may be determined in such studies, e.g., after 12, 18 or 24 weeks by evaluation of symptom scores every 6 weeks.

The administration of a pharmaceutical combination of the invention may result not only in a beneficial effect, e.g. a synergistic therapeutic effect, e.g. with regard to alleviating, delaying progression of or inhibiting the symptoms, but also in further surprising beneficial effects, e.g. fewer side-effects, an improved quality of life or a decreased morbidity, compared with a monotherapy applying only one of the

pharmaceutically active ingredients used in the combination of the invention.

A further benefit may be that lower doses of the active ingredients of the combination of the invention may be used, for example, that the dosages need not only often be smaller but may also be applied less frequently, which may diminish the incidence or severity of side-effects. This is in accordance with the desires and requirements of the patients to be treated.

It is one objective of this invention to provide a pharmaceutical composition comprising a quantity, which may be jointly therapeutically effective at targeting or preventing cancer, e.g. , a myeloproliferative disorder. In this composition, a compound of formula I and a compound of formula II may be administered together, one after the other or separately in one combined unit dosage form or in two separate unit dosage forms. The unit dosage form may also be a fixed combination.

The pharmaceutical compositions for separate administration of both compounds, or for the administration in a fixed combination, e.g. a single composition comprising both compounds according to the invention may be prepared in a manner known per se and are those suitable for enteral, such as oral or rectal, and parenteral administration to mammals (warm-blooded animals), including humans, comprising a therapeutically effective amount of at least one pharmacologically active combination partner alone, e.g. as indicated above, or in combination with one or more pharmaceutically acceptable carriers or diluents, especially suitable for enteral or parenteral application.

Formulations

The drug combinations provided herein may be formulated by a variety of methods apparent to those of skill in the art of pharmaceutical formulation. The various release properties described above may be achieved in a variety of different ways.

Suitable formulations include, for example, tablets, capsules, press coat formulations, and other easily administered formulations.

Suitable pharmaceutical formulations may contain, for example, from about 0.1 % to about 99.9 , preferably from about 1 % to about 60 , of the active

ingredient(s). Pharmaceutical formulations for the combination therapy for enteral or parenteral administration are, for example, those in unit dosage forms, such as sugar- coated tablets, tablets, capsules or suppositories, or ampoules. If not indicated otherwise, these are prepared in a manner known per se, for example by means of conventional mixing, granulating, sugar-coating, dissolving or lyophilizing processes. It will be appreciated that the unit content of a combination partner contained in an individual dose of each dosage form need not in itself constitute an effective amount since the necessary effective amount may be reached by administration of a plurality of dosage units.

The pharmaceutical compositions can contain, as the active ingredient, one or more of the compounds of the invention above in combination with one or more pharmaceutically acceptable carriers (excipients). In making the compositions of the invention, the active ingredient is typically mixed with an excipient, diluted by an excipient or enclosed within such a carrier in the form of, for example, a capsule, sachet, paper, or other container. When the excipient serves as a diluent, it can be a solid, semisolid, or liquid material, which acts as a vehicle, carrier or medium for the active ingredient. Thus, the compositions can be in the form of tablets, pills, powders, lozenges, sachets, cachets, elixirs, suspensions, emulsions, solutions, syrups, aerosols (as a solid or in a liquid medium), ointments containing, for example, up to 10% by weight of the active compound, soft and hard gelatin capsules, suppositories, sterile injectable solutions, and sterile packaged powders.

In preparing a formulation, the active compound can be milled to provide the appropriate particle size prior to combining with the other ingredients. If the active compound is substantially insoluble, it can be milled to a particle size of less than 200 mesh. If the active compound is substantially water soluble, the particle size can be adjusted by milling to provide a substantially uniform distribution in the formulation, e.g. about 40 mesh.

The compounds of the invention may be milled using known milling procedures such as wet milling to obtain a particle size appropriate for tablet formation and for other formulation types. Finely divided (nanoparticulate) preparations of the compounds of the invention can be prepared by processes known in the art, for example see International Patent Application No. WO 2002/000196.

Some examples of suitable excipients include lactose (e.g. lactose monohydrate), dextrose, sucrose, sorbitol, mannitol, starches (e.g. sodium starch glycolate), gum acacia, calcium phosphate, alginates, tragacanth, gelatin, calcium silicate, colloidal silicon dioxide, microcrystalline cellulose, polyvinylpyrrolidone (e.g. povidone), cellulose, water, syrup, methyl cellulose, and hydroxypropyl cellulose. The formulations can additionally include: lubricating agents such as talc, magnesium stearate, and mineral oil; wetting agents; emulsifying and suspending agents; preserving agents such as methyl- and propylhydroxy-benzoates; sweetening agents; and flavoring agents. The compositions of the invention can be formulated so as to provide quick, sustained or delayed release of the active ingredient after administration to the patient by employing procedures known in the art.

For preparing solid compositions such as tablets, the principal active ingredient is mixed with a pharmaceutical excipient to form a solid preformulation composition containing a homogeneous mixture of a compound of the present invention. When referring to these preformulation compositions as homogeneous, the active ingredient is typically dispersed evenly throughout the composition so that the composition can be readily subdivided into equally effective unit dosage forms such as tablets, pills and capsules. This solid preformulation is then subdivided into unit dosage forms of the type described above containing from, for example, about 0.1 to about 1000 mg of the active ingredient of the present invention.

The tablets or pills of the present invention can be coated or otherwise compounded to provide a dosage form affording the advantage of prolonged action. For example, the tablet or pill can comprise an inner dosage and an outer dosage component, the latter being in the form of an envelope over the former. The two components can be separated by an enteric layer which serves to resist disintegration in the stomach and permit the inner component to pass intact into the duodenum or to be delayed in release. A variety of materials can be used for such enteric layers or coatings, such materials including a number of polymeric acids and mixtures of polymeric acids with such materials as shellac, cetyl alcohol, and cellulose acetate.

The liquid forms in which the compounds and compositions of the present invention can be incorporated for administration orally or by injection include aqueous solutions, suitably flavored syrups, aqueous or oil suspensions, and flavored emulsions with edible oils such as cottonseed oil, sesame oil, coconut oil, or peanut oil, as well as elixirs and similar pharmaceutical vehicles.

Compositions for inhalation or insufflation include solutions and suspensions in pharmaceutically acceptable, aqueous or organic solvents, or mixtures thereof, and powders. The liquid or solid compositions may contain suitable pharmaceutically acceptable excipients as described supra. In some embodiments, the compositions are administered by the oral or nasal respiratory route for local or systemic effect.

Compositions can be nebulized by use of inert gases. Nebulized solutions may be breathed directly from the nebulizing device or the nebulizing device can be attached to a face masks tent, or intermittent positive pressure breathing machine. Solution, suspension, or powder compositions can be administered orally or nasally from devices which deliver the formulation in an appropriate manner.

In particular, a therapeutically effective amount of each of the combination partner of the combination of the invention may be administered simultaneously or sequentially and in any order, and the components may be administered separately or as a fixed combination. For example, the method of treating a disease according to the invention may comprise (i) administration of the first agent (a) in free or

pharmaceutically acceptable salt form and (ii) administration of an agent (b) in free or pharmaceutically acceptable salt form, simultaneously or sequentially in any order, in jointly therapeutically effective amounts, preferably in synergistically effective amounts, e.g. in daily or intermittently dosages corresponding to the amounts described herein. The individual combination partners of the combination of the invention may be administered separately at different times during the course of therapy or concurrently in divided or single combination forms. Furthermore, the term administering also encompasses the use of a pro-drug of a combination partner that convert in vivo to the combination partner as such. The instant invention is therefore to be understood as embracing all such regimens of simultaneous or alternating treatment and the term "administering" is to be interpreted accordingly.

The effective dosage of each of the combination partners employed in the combination of the invention may vary depending on the particular compound or pharmaceutical composition employed, the mode of administration, the condition being treated, the severity of the condition being treated. Thus, the dosage regimen of the combination of the invention is selected in accordance with a variety of factors including the route of administration and the renal and hepatic function of the patient. A clinician or physician of ordinary skill can readily determine and prescribe the effective amount of the single active ingredients required to alleviate, counter or arrest the progress of the condition.

Dosages

The optimal dose of the combination of agents for treatment of disease can be determined empirically for each individual using known methods and will depend upon a variety of factors, including, though not limited to, the degree of advancement of the disease; the age, body weight, general health, gender and diet of the individual; the time and route of administration; and other medications the individual is taking. Optimal dosages may be established using routine testing and procedures that are well known in the art.

The amount of combination of agents that may be combined with the carrier materials to produce a single dosage form will vary depending upon the individual treated and the particular mode of administration. In some embodiments the unit dosage forms containing the combination of agents as described herein will contain the amounts of each agent of the combination that are typically administered when the agents are administered alone.

Frequency of dosage may vary depending on the compound used and the particular condition to be treated or prevented. In general, the use of the minimum dosage that is sufficient to provide effective therapy is preferred. Patients may generally be monitored for therapeutic effectiveness using assays suitable for the condition being treated or prevented, which will be familiar to those of ordinary skill in the art.

The dosage form can be prepared by various conventional mixing, comminution and fabrication techniques readily apparent to those skilled in the chemistry of drug formulations.

The oral dosage form containing the combination of agents or individual agents of the combination of agents may be in the form of micro-tablets enclosed inside a capsule, e.g. a gelatin capsule. For this, a gelatin capsule as is employed in

pharmaceutical formulations can be used, such as the hard gelatin capsule known as CAPSUGEL, available from Pfizer.

Many of the oral dosage forms useful herein contain the combination of agents or individual agents of the combination of agents in the form of particles. Such particles may be compressed into a tablet, present in a core element of a coated dosage form, such as a taste-masked dosage form, a press coated dosage form, or an enteric coated dosage form, or may be contained in a capsule, osmotic pump dosage form, or other dosage form.

In an embodiment,the drug compounds of the present invention (for example, a dual PDK/mTOR inhibitor and a JAK inhibitor) are present in the combinations, dosage forms, pharmaceutical compositions and pharmaceutical formulations disclosed herein in a ratio in the ranges of, for example, approximately 100: 1 to 1 : 100, 75: 1 to 1 :75, 50: 1 to 1 :50, 20: 1 to 1 to 20, 10: 1 to 1 : 10, 5: 1 to 1 :5, 2: 1 to 1 :2, and 1 : 1.

The optimum ratios, individual and combined dosages, and concentrations of the drug compounds that yield efficacy without toxicity are based on the kinetics of the active ingredients' availability to target sites, and are determined using methods known to those of skill in the art.

The invention being thus described, it will be obvious that the same can be varied in many ways. Such variations are not to be regarded as a departure from the scope of the invention, and all such modifications are intended to be included within the scope of the following claims. For example, any of the specific JAK inhibitors disclosed herein can be combined with any of the PBK/mTOR inhibitors disclosed herein, and can be used to treat any of the disease states disclosed herein. Furthermore, when the JAK inhibitor and PI3KmTOR inhibitor are combined into a single dosage form, they can be combined with any pharmaceutically acceptable carrier or carriers described herein.

Examples

The following examples serve to illustrate the invention without limiting the invention in its scope.

Synthesis of 2-methyl-2-(4-(3-methyl-2-oxo-8-(quinolin-3-yl)-2,3-dihydro- imidazo[4,5-c]quinolin-l-yl)phenyl)propionitrile (Compound A) Temperatures are measured in degrees celsius (°C). Unless otherwise indicated, the reactions take place at room temperature (RT). Ratios of solvents (e.g. in eluents or solvent mixtures) are given in volume by volume (v/v).

HPLC linear gradient between A = H ₂ 0/TFA 1000: 1 and B = acetonitrile/TFA 1000: 1; Grad 1: 2-100 % B in 4.5 min and 1 min at 100 % B; column: Chromolith Performance 100 mm x 4.5 mm (Merck, Darmstadt, Germany); flow rate 2 ml/min. Detection at 215 nM; Grad 2: 2-100% B in 5 minutes and 2 minutes at 100% B; column: Nucleosil Cig reverse phase; 150 mm x 4.6 mm (SMT, Burkard Instruments, Dietikon, Switzerland); flow rate: 2.0 ml/min. Detection at 215 nm.

Example la

5-Bromo-2-(2-nitro-vinylamino)-benzoic acid

A suspension of 25 g (16 mmol) of 2-amino-5-bromo-benzoic acid (Fluka, Buchs, Switzerland) in H ₂ 0-HC1 (37%) (10: 1) is stirred for 8 h and then filtered

(solution A). 8.17 g (255 mmol) of nitromethane (Fluka, Buchs, Switzerland) are added over 10 min to an ice- bath cooled mixture of 35 g of ice and 15.3 g (382 mmol) of NaOH. After stirring for 1 h at 0 °C and 1 h at rt, the solution is added at 0 ^° C to 28 g of ice and 42 ml of HC1 (37%) (solution B). Solutions A and B are combined and the reaction mixture is stirred for 18 h at RT. The yellow precipitate is filtered off, washed with H ₂ 0 and dried in vacuo at 40 ^° C to give the title compound. ES-MS: 287, 289 (M + H) ⁺ , Br pattern; ¹ H NMR (DMSO-d ₆ ): δ 13.7-14.6/br s (1H), 12.94/d (1H), 8.07/d (1H) _, 8.03/dd (1H), 7.83/dd (1H), 7.71/d (lH)i 6.76/d (1H). Example lb

6-Bromo-3-nitro-quinol 29 g (101 mmol) of 5-bromo-2-(2-nitro-vinylamino)-benzoic acid (Example la) and 11.9 g (121 mmol) of potassium acetate in 129 ml (152 mmol) of acetic anhydride are stirred for 1.5 h at 120 C. The precipitate is filtered off and washed with acetic acid until the filtrate is colorless, then is washed with H ₂ 0 and dried in vacuo to give the title compound. ES-MS: 269, 271 (M + H) ⁺ , Br pattern; analytical HPLC: W= 2.70 min (Grad 1).

Example lc

6-Bromo-4-chloro-3-nitro-quinoline

20 g (74.3 mmol) of 6-bromo-3-nitro-quinolin-4-ol (Example lb) in 150 ml (1.63 mol) of POCI ₃ are stirred for 45 min at 120 C. The mixture is cooled to RT and poured slowly into ice-water. The precipitate is filtered off, washed with ice-cold water, and dissolved in CH ₂ C1 ₂ . The organic phase is washed with cold brine, and the aqueous phase is discarded. After drying over MgS0 ₄ , the organic solvent is evaporated to dryness to provide the title compound. 1H NMR (CDC1 ₃ ): δ 9.20/s (1H), 8.54/d (1H), 8.04/d (1H), 7.96/dd (1H); analytical HPLC: W= 4.32 min (Grad 1).

Example Id

2-Methyl-2-(4-nitro-phenyl)-propionitrile To 15 g (92.5 mmol) of (4-nitro-phenyl)-acetonitrile (Fluka, Buchs,

Switzerland), 1.64 mg (5.09 mmol) of tetrabutylammonium bromide (Fluka, Buchs, Switzerland) and 43.3 g (305 mmol) of iodomethane in 125 mL of CH ₂ CI ₂ are added 10 g (250 mmol) of NaOH in 125 ml of water. The reaction mixture is stirred for 20 h at RT. After this time, the organic layer is separated, dried over MgS0 ₄ , and evaporated to dryness. The residue is dissolved in diethyl ether and treated with black charcoal for 30 min., filtered over Celite and evaporated in vacuo to give the title compound as a pale yellow solid. Analytical HPLC: t _ret = 3.60 minutes (Grad 1).

Example le

(2-(4-Amino-phenyl)-2-methyl-propionitrile

16 g (84.1 mmol) of 2-methyl-2-(4-nitro-phenyl)-propionitrile (Example Id) and 4.16 g of Raney-Ni are shacked in 160 ml of THF-MeOH (1: 1) under 1.1 bar of H ₂ for 12 h. at RT. After completion of the reaction, the catalyst is filtered-off and the filtrate is evaporated to dryness. The residue is purified by flash chromatography on silica gel (hexane-EtOAc 3: 1 to 1:2) to provide the title compound as an oil. ES-MS: 161 (M + H) ⁺ ; analytical HPLC: t _ret = 2.13 minutes (Grad 1).

Example If

2-[4-(6-Bromo-3-nitro-quinolin-4-ylamino)-phenyl]-2-m 18 g (62.6 mmol) of 6-bromo-4-chloro-3-nitro-quinoline (Example lc) and 11 g

(68.9 mmol) of (2-(4-amino-phenyl)-2-methyl-propionitrile (Example le) are dissolved in 350 ml of acetic acid and stirred for 2 h. After this time, water is added and the yellow precipitate is filtered off and washed with H ₂ O. The solid is dissolved in EtOAc-THF (1 : 1), washed with sat. aqueous NaHC0 ₃ and dried over MgS0 ₄ . The organic phase is evaporated to dryness to give the title compound as a yellow solid. ES-MS: 411, 413 (M + H) ⁺ , Br pattern; analytical HPLC: t _ret = 3.69 min (Grad 1).

Example lg

2-[4-(3-Amino-6-bromo-quinolin-4-ylamino)-phenyl]-2-methyl-p ropw

24 g (58.4 mmol) of 2-[4-(6-bromo-3-nitro-quinolin-4-ylamino)-phenyl]-2- methyl-propionitrile (Example le) is shacked in 300 ml of MeOH-THF (1: 1) under 1.1 bar of H ₂ in the presence of 8.35 g of Raney-Ni for 1 h. After completion of the reaction, the catalyst is filtered off and the filtrate is evaporated to dryness to give the title compound as a yellow foam. ES-MS: 381, 383 (M + H) ⁺ , Br pattern; analytical HPLC: t _ret = 3.21 min (Grad 1).

Example lh

2-[4-(8-Bromo-2-oxo-2,3-dihydro-imidazo[4,5-c]quinolin-l-yl) -phenyl]-2-methyl- propionitrile A solution of 5 g (13.1 mmol) of 2-[4-(3-amino-6-bromo-quinolin-4-ylamino)- phenyl]-2- methyl-propionitrile (Example lg) and 1.59 g (15.7 mmol) of triethylamine in 120 ml CH ₂ C1 ₂ is added over 40 min to a solution of 2.85 g (14.4 mmol) of trichloromethyl chloroformate (Fluka, Buchs, Switzerland) in 80 ml of CH ₂ C1 ₂ at 0 C with an ice-bath. The reaction mixture is stirred for 20 min at this temperature then is quenched with sat. aqueous NaHC0 ₃ , stirred for 5 min. and extracted with CH ₂ C1 ₂ . The organic layer is dried over Na ₂ S0 ₄ , filtered and evaporated in vacuo to give the crude title compound as a brownish solid. ES-MS: 407, 409 (M + H) ⁺ , Br pattern; analytical HPLC: t _ret = 3.05 min (Grad 1).

Example li

2-[4-(8-Bromo-3-methyl-2-oxo-2,3-dihydro-imidazo[4,5-c]quino lin-l-yl)-phenyl]-2- methyl- propionitrile To a solution of 3.45 g (8.47 mmol) of 2-[4-(8-bromo-2-oxo-2,3-dihydro- imidazo[4,5-c]quinolin-l-yl)-phenyl]-2-methyl-propionitrile (Example lh), 1.8 g (12.7 mmol) of iodomethane (Fluka, Buchs, Switzerland) and 273 mg (0.847 mmol) of tetrabutylammonium bromide (Fluka, Buchs, Switzerland) in 170 ml of CH ₂ C1 ₂ is added a solution of 508 mg (12.7 mmol) of NaOH (Fluka, Buchs, Switzerland) in 85 ml of H ₂ 0. The reaction mixture is stirred for 2 days and 900 mg (6.35 mmol) of iodomethane and 254 mg (6.35 mmol) of NaOH in 5 ml of H ₂ 0 are added. The reaction mixture is stirred for 1 day at RT . After this time, the reaction is quenched with H ₂ 0 and extracted with CH ₂ C1 ₂ (2x). The organic layer is washed with brine, dried over Na ₂ S0 ₄ , filtered and evaporated in vacuo to give the title compound as a beige solid. ES-MS: 421 , 423 (M + H) ⁺ , Br pattern; analytical HPLC: t _ret = 3.15 min (Grad 1).

Example li

2-Methyl-2-(4-(3-methyl-2-oxo-8-(quinolin-3-yl)-2,3-dihydro- imidazo[4,5-c]quinolin-l- yl)phenyl)propionitrile 0.3 mmol of 3-quinoline boronic acid (Aldrich, Buchs, Switzerland), 8 mg of bis(triphenylphosphine)palladium (II) dichloride (Fluka, Buchs, Switzerland) and 0.5 ml of a 1 M solution of Na ₂ C0 ₃ are added to a solution of 84 mg (0.2 mmol) of 2-[4-(8- bromo-3-methyl- 2-oxo-2,3-dihydro-imidazo[4,5-c]quinolin-l-yl)-phenyl]-2-met hyl- propionitrile (Example li) in 2 ml of DMF. The mixture is stirred for 1 h. at 100 C.

After this time, the mixture is quenched with sat. aqueous NaHC0 ₃ and extracted with EtOAc (2x). The organic layer is washed with brine, dried over Na ₂ S0 ₄ , filtered and evaporated in vacuo. The residue is loaded on silica gel and purified by flash

chromatography to give the title compound. ES-MS: 470 (M + H) ⁺ ; analytical HPLC: t _ret = 2.90 min (Grad 1).

Synthesis of (3R)- and (3S)-3-cyclopentyl-3-[4-(7H-pyrrolo[2,3-d]pyrimidin-4-yl)- lH-pyrazol-l-yl]propanenitrile (Compound B)

Step 1. (2E)- and (2Z)-3-Cyclopentylacrylonitrile

To a solution of 1.0 M potassium tert-butoxide in THF (235 mL) at 0°C was added dropwise a solution of diethyl cyanomethylphosphonate (39.9 mL, 0.246 mol) in THF(300 mL). The cold bath was removed and the reaction was warmed to room temperature followed by recooling to 0°C, at which time a solution of

cyclopentanecarbaldehyde (22.0 g, 0.224 mol) in THF (60 mL) was added dropwise. The bath was removed and the reaction warmed to ambient temperature and stirred for 64 hours. The mixture was partitioned between diethyl ether and water, the aqueous phase was extracted with three portions of ether, followed by two portions of ethyl acetate. The combined extracts were washed with brine, then dried over sodium sulfate, filtered and concentrated in vacuo to afford a mixture containing 24.4 g of olefin isomers which was used without further purification (89%).

1H NMR (400 MHz, CDC1 ₃ ): δ 6.69 (dd, IH, trans olefin), 6.37 (t, IH, cis olefin), 5.29 (dd, IH, trans olefin), 5.20 (d, IH, cis olefin), 3.07-2.95 (m, IH, cis product), 2.64- 2.52 (m, IH, trans product), 1.98-1.26 (m, 16H).

Step 2. (3R)- and (3S)-3-Cyclopentyl-3-[4-(7-[2-(trimethylsilyl)ethoxy]methyl- 7H- pyrrolo[2,- 3-d]-pyrimidin-4-yl)-lH-pyrazol-l-yl]propanenitrile To a solution of 4-(lH-pyrazol-4-yl)-7-[2-(trimethylsilyl)ethoxy]methyl-7H- pyrrolo[2,3-d]-pyrimidine (15.0 g, 0.0476 mol) in ACN (300 mL) was added 3- cyclopentylacrylonitrile (15 g, 0.12 mol) (as a mixture of cis and trans isomers), followed by DBU (15 mL, 0.10 mol). The resulting mixture was stirred at room temperature overnight. The ACN was evaporated. The mixture was diluted with ethyl acetate, and the solution was washed with 1.0 N HC1. The aqueous layer was back- extracted with three portions of ethyl acetate. The combined organic extracts were washed with brine, dried over sodium sulfate, filtered and concentrated. The crude product was purified by silica gel chromatography (gradient of ethyl acetate/hexanes) to yield a viscous clear syrup, which was dissolved in ethanol and evaporated several times to remove ethyl acetate, to afford 19.4 g of racemic adduct (93%). The enantiomers were separated by preparative-HPLC, (OD-H, 15% ethanol/hexanes) and used separately in the next step to generate their corresponding final product. The final products (see Step 3) stemming from each of the separated enantiomers were found to be active JAK inhibitors; however, the final product stemming from the second peak to elute from the preparative-HPLC was more active than its enantiomer.

1H NMR (300 MHz, CDC1 ₃ ): δ 8.85 (s, 1H), 8.32 (s, 2H), 7.39 (d, 1H), 6.80 (d, 1H), 5.68 (s, 2H), 4.26 (dt, 1H), 3.54 (t, 2H), 3.14 (dd, 1H), 2.95 (dd, 1H), 2.67-2.50 (m, 1H), 2.03-1.88 (m, 1H), 1.80-1.15 (m, 7H), 0.92 (t, 2H), -0.06 (s, 9H); MS(ES): 437 (M+l).

Step 3.

To a solution of 3-cyclopentyl-3-[4-(7-[2-(trimethylsilyl)ethoxy]methyl-7H- pyrrolo[2,3-d]— pyrimidin-4-yl)-lH-pyrazol-l-yl]propanenitrile (6.5 g, 0.015 mol, R or S enantiomer as isolated above) in DCM (40 mL) was added TFA (16 mL) and this was stirred for 6 hours. The solvent and TFA were removed in vacuo. The residue was dissolved in DCM and concentrated using a rotary evaporator two further times to remove as much TFA as possible. Following this, the residue was stirred with ethylenediamine (4 mL, 0.06 mol) in methanol (30 mL) overnight. The solvent was removed in vacuo, water was added and the product was extracted into three portions of ethyl acetate. The combined extracts were washed with brine, dried over sodium sulfate, decanted and concentrated to afford the crude product which was purified by flash column chromatography (eluting with a gradient of methanol/DCM). The resulting mixture was further purified by preparative-HPLC/MS (CI 8 eluting with a gradient of ACN/H ₂ 0 containing 0.15% NH ₄ OH) to afford product (2.68 g, 58%).

1H NMR (400 MHz, DMSO-d ₆ ): δ 12.11 (br s, 1H), 8.80 (s, 1H), 8.67 (s, 1H), 8.37 (s, 1H), 7.60 (d, 1H), 6.98 (d, 1H), 4.53 (dt, 1H), 3.27 (dd, 1H), 3.19 (dd, 1H), 2.48- 2.36 (m, 1H), 1.86-1.76 (m, 1H), 1.68-1.13 (m, 7H); MS(ES): 307 (M+l).

Synthesis of (3R)-3-cyclopentyl-3-[4-(7H-pyrrolo[2,3-d]pyrimidin-4-yl)-lH -pyrazol- l-yl]propanenitrile maleic acid salt

To a test tube was added (3R)-3-Cyclopentyl-3-[4-(7H-pyrrolo[2,3-d]pyrimidin- 4-yl)-lH-pyrazol-l-yl]propanenitrile (153.7 mg, 0.5 mmol) and maleic acid (61.7 mg) followed by isopropyl alcohol (IPA) (4 mL). The resulting mixture was heated to clear, cooled to room temperature, and then stirred for another 2.5 hours. The precipitate was collected by filtration and the cake was washed with 0.8 mL of cold IPA. The cake was dried under vacuum to constant weight to provide the final salt product (173 mg).

Synthesis of (3R)-3-cyclopentyl-3-[4-(7H-pyrrolo[2,3-d]pyrimidin-4-yl)-lH -pyrazol- l-yl]propanenitrile phosphoric acid salt

To a test tube was added (3R)-3-Cyclopentyl-3-[4-(7H-pyrrolo[2,3-d]pyrimidin- 4-yl)-lH-pyrazol-l-yl]propanenitrile (153.5 mg) and phosphoric acid (56.6 mg) followed by isopropyl alcohol (IPA) (5.75 mL). The resulting mixture was heated to clear, cooled to room temperature, and then stirred for another 2 hours. The precipitate was collected by filtration and the cake was washed with 0.6 mL of cold IPA. The cake was dried under vacuum to constant weight to provide the final salt product (171.7 mg). Synthesis of (3R)-3-cyclopentyl-3-[4-(7H-pyrrolo[2,3-d]pyrimidin-4-yl)-lH -pyrazol- l-yl]propanenitrile sulfuric acid salt

To a test tube was added (3R)-3-Cyclopentyl-3-[4-(7H-pyrrolo[2,3-d]pyrimidin- 4-yl)-lH-pyrazol-l-yl]propanenitrile (153.0 mg) and sulfuric acid (56.1 mg) followed by acetonitrile (7.0 mL). The resulting mixture was heated to clear, cooled to room temperature, and then stirred for another 2 hours. The precipitate was collected by filtration and the cake was washed with 0.8 mL of cold acetonitrile. The cake was dried under vacuum to constant weight to provide the final salt product (180 mg). Biological Activity

Disregulated JAK/STAT signaling, occurring mainly but not exclusively in cells harboring mutations in JAK2 or other proteins involved in JAK/STAT pathway such as MPL, CBL, or Lnk, represents a pathogenetic event in chronic myeloproliferative neoplasms (MPN). However, activation of other downstream pathways such as the ERK and PDK/Akt/mTOR pathway has been also documented in JAK2V617F-mutated cells. This study explored in vitro the potential relevance of targeting PI3K/Akt/mTor pathway with specific inhibitors, alone or in combination with JAK2 inhibitor. Indeed, clinical trials have recently documented the effectiveness of JAK1/2 inhibitors (Verstovsek S, NEJM, 2010;363: 117; Pardanani A, JCO 2011; 29:789; Harrison C, NEJM 2012;

366:787; Verstovsek S, NEJM 2012; 366:799) and RAD001, an mTOR inhibitor

(Guglielmelli S, Blood 2011; 118:2069), in patients with myelofibrosis.

The following drugs were used: an allosteric (RAD001) and an ATP (PP242) mTOR competitor; a dual PI3K/mTOR inhibitor 2-methyl-2-[4-(3-methyl-2-oxo-8- quinolin-3-yl-2,3-dihydro-imidazo[4,5-c]quinolin-l-yl)-pheny l]-propionitrile

(Compound A); a JAK1/2 kinase ATP competitor (3R)-3-cyclopentyl-3-[4-(7H- pyrrolo[2,3-d]pyrimidin-4-yl)-lH-pyrazol-l-yl]propanenitrile (Compound B).

In vitro data.

Mouse (Ba/F3 and Ba/F3-EPOR wild-type or expressing JAK2V617F(VF) ) and human (JAK2VF mutated HEL and SET2) cell lines and primary MPN CD34+ cells from patients with myelofibrosis (MF) or polycythemia vera (PV) were used; BCR/ABL mutated K562 cells were used in some experiments. Cell proliferation, colony formation, apoptosis, cell cycle and protein phosphorylation status were evaluated. Effects of drug combination were analyzed according to Chou and Talalay to calculate the combination index (CI); a CI <1.0 indicates synergistic activity.

In the Ba/F3-EPOR JAK2V617F-mutated cells, cell proliferation was prevented by lower doses of RAD001 (615+50nM, measured as IC50), PP242 (98+5nM) and Compound A (87+50nM) compared to Ba/F3-EPOR JAK2 wild-type (wt) cells

(>10,000nM; 5,931+l,000nM; 676+200nM, respectively). In the case of the JAK inhibitor, the IC50 was 51+2nM for Compound B as compared to 457+15nM in wild- type cells. All above drugs were able to prevent short-term cell proliferation and colony formation in J AK2V617F- mutated HEL and SET2 cells as well. In particular, Compund A induced preferential inhibition in HEL and SET2 cells compared to K562 cells (IC50, 387+90nM and 334+40nM vs 5,000+Ι,ΟΟΟηΜ; P<0.01).

mTOR inhibitors induced cell cycle arrest in Go but were very poor inducers of apoptosis (less than 15-20% at maximum); conversely JAK1/2 inhibitors induced dose- dependent increase of Annexin-V -i-ve cells up to >60% and Compound A induced 30- 40% apoptosis at highest concentrations. Western blot analysis demonstrated that, in addition to the expected inhibition of phosphorylation of specific drug targets (mTOR, 4EBP1), all three PI3K/mTOR inhibitors also reduced the degree of phophoSTAT5. siRNA-induced down-regulation of mTOR in SET2, HEL and Ba/F3-EPOR

JAK2V617F cells resulted in reduced phosphoSTAT5, indicating a direct mTOR- dependent phopshoSTAT5 regulation.

Then, the activity of RAD001 and Compound A was analyzed in primary cells from MPN patients. Both drugs reduced clonogenic growth of MPN erythroid, myeloid and megakaryocytic progenitors at doses significantly lower (from 5 to 10-fold) than in normal cells, and prevented erythropoietin-independent colony (EEC) formation in the low nM range. In particular, Compound A impaired the proliferation of CD34+ cells of MF pts with an IC50= 43+20 vs 780+150 in healthy donors (P<0.01), and reduced colony formation of MF and PV hematopoietic progenitors at statistically lower doses (2 to 15-fold) compared to normal cells; the growth of EPO-independent colonies (EEC) of PV patients cells was potently inhibited (IC50=20+10nM). Single-colony genotyping in JAK2V617F mutated patients cells showed a 40+16% reduction of VF in favor of wild- type colonies (range 18-71%, n=7). Overall, these data indicated that inhibitors of PI3K/mTOR prevent proliferation and clonogenic capacity of MPN cells mainly through a cytostatic rather apoptotic effect (as JAK1/2 inhibitors preferentially do).

To determine whether simultaneous treatment with PI3K/AKt and JAK1/2 inhibitor displayed synergism, SET2 cells were treated with different drug doses and their proliferation and apoptotic rate were measured. Synergism was calculated as the combination index (CI) according to Chou and Talalay. Evidence of synergism was obtained for Compound B with RAD001 (CI: 0.20), PP242 (CI: 0.20) and Compound A (CI: 0.37). Co-treatment of Compound A plus Compound B resulted in a synergistic increase of the apoptosis rate in SET2 (0=0.25).

Synergism was similarly demonstrated in Ba/F3-EPOR J AK2V617F- mutated cells. Co-treatment of Compound A plus Compound B resulted in synergistic inhibition of proliferation in BaF3-EPOR VF (CI=0.77) cells. Activity of RADOOl with Compound B was also assessed in an EEC assay. It was found that addition of RADOOl (5nM) or Compound A (50nM) to very low doses of JAK1/2 inhibitors (in the range of 5 to 50 nM) resulted in significant synergism and almost completely prevented EEC formation. In particular, the combination of Compound A and Compound B was highly effective in the EEC assay with a CI=0.17+0.04.

In summary, these in vitro data indicate that PDK/mTOR inhibitors are active against MPN cells and their combination with JAK1/2 inhibitors produced synergism, allowing the use of lower doses of each drug. Thus, concurrent targeting of PDK/mTOR and JAK/STAT pathway might represent a new therapeutic strategy to optimize efficacy and reduce toxicity in patients with MPN.

In Vivo Data:

To ascertain the effects of drugs targeting PDK/Akt/mTOR pathway alone and in combination with JAK2 inhibitor in a murine model of myeloproliferative neoplasms, a SCID BaF3 J4 _J fiT2 ^v617F -luciferase mouse model was used. This allows the monitoring of leukemic clone spread by the monitoring of luciferase activity, at the same time providing estimates of mice survival since it does not require killing of the animals to establish the progression and extent of disease. Female SCID mice (4-6 weeks of age; Harlan) were fed rodent standard chow and provided with water ad libitum. Mice were given 3χ10 ⁶ /Α, ^ν617ΙΪ - luc+ cells by tail vein injection. Mice were injected with D- luciferin before imaging to detect a bioluminescence signal that is proportional to the clone burden. Baseline imaging was performed using a Photon Imager (Biospace Lab) apparatus to establish bioluminescence on day 6 after cell injection. Then, mice were randomly divided into treatment cohorts of six mice each (Vehicle, Compound A, Compound B, Compound A plus Compound B). Drugs treatment was administered daily per os (by mouth). Imaging was performed on day 7, 14, 21, and 28 after the first drug dose. Mice were followed daily for survival and humanely sacrificed when they developed hind limb paralysis or became moribund and considered deceased at the time at which they were sacrificed. Mice received the following treatments (Table 1): Vehicle only, 60 mpk

Compound B, 45 mpk Compound A, and 60 mpk Compound B plus 45 mpk Compound A. Animals did not show appreciable body weight loss. Mean lifespan of Compound A plus Compound B cotreated mice was significantly increased compared to control mice (+54%, p<.01), Compound B treated (+35.2%, p<.02) and Compound A treated

(+11.9%) showing a synergistic effect against BaF3 JAK2 ^w6llv cells (See Table 1). In vivo imaging showed a delay of proliferation of BaF3-luc+ cells in mice receiving combination therapy as compared to all other treatment cohorts. In mice receiving the combination therapy, an intense bioluminescent signal was not recorded before day 28 following the administration of the first drug dose as compared to progressive increases in the other experimental groups.

Table 1: Mean lifespan of treatment groups.

II.

A C57B16/J JAK2 V617F Knock-in (KI) mouse model was generated by the flex switch strategy with insertion of inactivated V617F exon 13 sequence; mating with Vav- Cre mouse activates the VF allele producing a MPN phenotype in the progeny that results JAK2VF heterozygous. Mice were treated for 5 days, then blood, spleen and bone marrow cells were obtained for further analysis.

In KI mice treated for 5 days, drug combination was significantly more effective in reducing spleen weight (median spleen index (calculated as the ratio of spleen weight to body weight x 100) : 38, 35, 27 and 7 for Vehicle, Compound A, Compound B, and Compound A plus Compound B, respectively) and reticulocyte count median (No. per HPF (high-power field): 48, 50, 44, 35 and 3 for Vehicle, Compound A, Compound B, and Compound A plus Compound B, respectively) than either drugs alone. The phosphorylation levels of STAT5 and 4EBP1 in the spleen was significantly reduced in mice receiving Compound A plus Compound B as compared to single treatment with eithr Compound A or Compound B.