WO2006120456A1 - Pharmaceutical formulations of hdac inhibitors - Google Patents

Pharmaceutical formulations of hdac inhibitors Download PDF

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Publication number
WO2006120456A1
WO2006120456A1 PCT/GB2006/001737 GB2006001737W WO2006120456A1 WO 2006120456 A1 WO2006120456 A1 WO 2006120456A1 GB 2006001737 W GB2006001737 W GB 2006001737W WO 2006120456 A1 WO2006120456 A1 WO 2006120456A1
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WO
WIPO (PCT)
Prior art keywords
pharmaceutical composition
composition according
cyclodextrin
arginine
hdac inhibitor
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
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PCT/GB2006/001737
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English (en)
French (fr)
Inventor
Richard J. Bastin
Nicholas J. Hughes
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Topotarget UK Ltd
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Topotarget UK Ltd
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First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=36617353&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=WO2006120456(A1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Priority to CN2006800199663A priority Critical patent/CN101189003B/zh
Priority to KR1020077029199A priority patent/KR101340824B1/ko
Priority to MX2007013938A priority patent/MX2007013938A/es
Priority to KR1020137015868A priority patent/KR101329437B1/ko
Priority to EP06727086A priority patent/EP1901729B1/en
Priority to AT06727086T priority patent/ATE542527T1/de
Priority to HK08105489.9A priority patent/HK1110797B/en
Priority to US11/913,191 priority patent/US8835501B2/en
Priority to ZA200710313A priority patent/ZA200710313B/xx
Priority to CA2606598A priority patent/CA2606598C/en
Priority to EA200702467A priority patent/EA018982B1/ru
Priority to HRP20120341TT priority patent/HRP20120341T1/hr
Priority to PL06727086T priority patent/PL1901729T3/pl
Priority to ES06727086T priority patent/ES2380887T3/es
Priority to JP2008510642A priority patent/JP5108750B2/ja
Priority to DK06727086.8T priority patent/DK1901729T3/da
Priority to NZ563236A priority patent/NZ563236A/en
Priority to UAA200713711A priority patent/UA99810C2/ru
Application filed by Topotarget UK Ltd filed Critical Topotarget UK Ltd
Priority to RS20120155A priority patent/RS52214B/sr
Priority to AU2006245495A priority patent/AU2006245495B2/en
Priority to BRPI0610128-3A priority patent/BRPI0610128B1/pt
Priority to SI200631312T priority patent/SI1901729T1/sl
Publication of WO2006120456A1 publication Critical patent/WO2006120456A1/en
Priority to IL187231A priority patent/IL187231A/en
Anticipated expiration legal-status Critical
Priority to NO20076366A priority patent/NO339954B1/no
Priority to IL224229A priority patent/IL224229A/en
Priority to US14/451,928 priority patent/US9856211B2/en
Priority to US15/813,582 priority patent/US9957227B2/en
Ceased legal-status Critical Current

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    • A61K31/18—Sulfonamides
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C311/00—Amides of sulfonic acids, i.e. compounds having singly-bound oxygen atoms of sulfo groups replaced by nitrogen atoms, not being part of nitro or nitroso groups
    • C07C311/15—Sulfonamides having sulfur atoms of sulfonamide groups bound to carbon atoms of six-membered aromatic rings
    • C07C311/21—Sulfonamides having sulfur atoms of sulfonamide groups bound to carbon atoms of six-membered aromatic rings having the nitrogen atom of at least one of the sulfonamide groups bound to a carbon atom of a six-membered aromatic ring
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    • A61K47/26—Carbohydrates, e.g. sugar alcohols, amino sugars, nucleic acids, mono-, di- or oligo-saccharides; Derivatives thereof, e.g. polysorbates, sorbitan fatty acid esters or glycyrrhizin
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Definitions

  • This invention generally pertains to the field of pharmaceuticals and pharmacy, and more specifically to pharmaceutical compositions comprising certain carbamic acid compounds (e.g., which inhibit histone deacetylase (HDAC) activity) and one or more additional ingredients selected from cyclodextrin, arginine, and meglumine.
  • HDAC histone deacetylase
  • the present invention also pertains to the use of such compositions, for example, in the inhibition of HDAC, and in the treatment of conditions mediated by HDAC.
  • Histone Deacetylase HDAC
  • Histones are small, positively charged proteins which are rich in basic amino acids (positively charged at physiological pH), which contact the phosphate groups (negatively charged at physiological pH) of DNA.
  • Histones There are five main classes of histones, H1, H2A, H2B, H3, and H4.
  • the amino acid sequences of histones H2A, H2B, H3, and H4 show remarkable conservation between species, whereas H1 varies somewhat, and in some cases is replaced by another histone, e.g., H5.
  • H2A, H2B, H3, and H4 together form a disk-shaped octomeric protein core, around which DNA (about 140 base pairs) is wound to form a nucleosome.
  • Individual nucleosomes are connected by short stretches of linker DNA associated with another histone molecule (e.g., H1 , or in certain cases, H5) to form a structure resembling a beaded string, which is itself arranged in a helical stack, known as a solenoid.
  • H1 histone molecule
  • histones are synthesised during the S phase of the cell cycle, and newly synthesised histones quickly enter the nucleus to become associated with DNA. Within minutes of its synthesis, new DNA becomes associated with histones in nucleosomal structures.
  • a small fraction of histones, more specifically, the amino side chains thereof, are enzymatically modified by post-translational addition of methyl, acetyl, or phosphate groups, neutralising the positive charge of the side chain, or converting it to a negative charge.
  • lysine and arginine groups may be methylated
  • lysine groups may be acetylated
  • serine groups may be phosphorylated.
  • Methylation, acetylation, and phosphorylation of amino termini of histones which extend from the nucleosomal core affect chromatin structure and gene expression. (See, for example, Spencer, V.A. and Davie, J. R., 1999, Gene, Vol. 240(1), pp. 1-12).
  • Acetylation and deacetylation of histones is associated with transcriptional events leading to cell proliferation and/or differentiation. Regulation of the function of transcription factors is also mediated through acetylation.
  • Histone deacetylation include: Kouzarides, T., 1999, "Histone acetylases and deacetylases in cell proliferation," Curr. Qpin. Genet. Dev., Vol. 9, No. 1 , pp. 40-48; Pazin, MJ. , et al., 1997, "What's up and down with histone deacetylation and transcription?," CeH, Vol. 89, No. 3, pp. 325-328.
  • HDACs histone deacetylases
  • HDAC1 histone deacetylases
  • HDAC11 histone deacetylases
  • yeast histone deacetylases and plant histone deacetylases have also been identified.
  • the first deacetylase, HDAC1 was identified in 1996 (see, for example, Taunton, J., et al., 1996, Science, Vol. 272, pp. 408- 411). Subsequently, two other nuclear mammalian deacetylases were found, HDAC2 and HDAC3.
  • HDACs function as part of large multi-protein complexes, which are tethered to the promoter and repress transcription.
  • Well characterised transcriptional repressors such as Mad (Laherty, CD., et al., 1997, CeJI, Vol. 89(3), pp. 349-356), pRb (Brehm, A., et al., 1998, Nature. 1998, Vol. 391 , pp. 597-601), nuclear receptors (Wong, J., et al., 1998, EMBO J., Vol. 17(2), pp. 520-534) and YY1 (Yang, W.M., et al., 1997, J. Biol. Chem., Vol. 272, pp. 28001-28007) associate with HDAC complexes to exert their repressor function.
  • Trichostatin A (Yoshida, M., et al., 1990, J. Biol. Chem.. Vol. 265(28), pp. 17174-17179) causes cell cycle arrest at both G1 and G2 phases (Yoshida, M., Beppu, T., 1988, Exp. Cell. Res., Vol. 177, pp. 122-131), reverts the transformed phenotype of different cell lines, and induces differentiation of Friend leukaemia cells and others (Yoshida, M., et al., 1990, J. Antibiot.
  • TSA Trichostatin A
  • TSA and SAHA have been reported to inhibit cell growth, induce terminal differentiation, and prevent the formation of tumours in mice (Finnin et al., 1999, Nature, Vol. 401, pp. 188-193).
  • Cell cycle arrest by TSA correlates with an increased expression of gelsolin (Hoshikawa, Y., et al., 1994, Exp. Cell- Res., Vol. 214(1), pp. 189-197), an actin regulatory protein that is down regulated in malignant breast cancer (Mielnicki, L.M., et al., 1999, Exp. Cell. Res., Vol. 249(1), pp. 161-176). Similar effects on cell cycle and differentiation have been observed with a number of deacetylase inhibitors (Kim et al., 1999, Oncogene, Vol. 18(15), pp. 2461-2470).
  • HDACs histone deacetylases
  • APL acute promyelocytic leukemias
  • t(15;17) a translocation of chromosomes 15 and 17 results in the expression of a fusion protein containing the N-terminal portion of PML gene product linked to most of RAR ⁇ (retinoic acid receptor).
  • RAR ⁇ retinoic acid receptor
  • the wild type RAR ⁇ represses target genes by tethering HDAC repressor complexes to the promoter DNA.
  • retinoic acid binds RAR ⁇ and displaces the repressor complex, allowing expression of genes implicated in myeloid differentiation.
  • the RAR ⁇ fusion proteins occurring in APL subjects are no longer - A - responsive to physiological levels of RA and they interfere with the expression of the RA-inducible genes that promote myeloid differentiation. This results in a clonal expansion of promyelocytic cells and development of leukaemia.
  • HDACs may be important therapeutic targets in other types of cancer.
  • Cell lines derived from many different cancers prostate, colorectal, breast, neuronal, hepatic are induced to differentiate by HDAC inhibitors (Yoshida, M. and Horinouchi, S., 1999, Ann. N. Y. Acad. ScL Vol. 886, pp. 23-36).
  • HDAC inhibitors have been studied in animal models of cancer. They reduce tumour growth and prolong the lifespan of mice bearing different types of transplanted tumours, including melanoma, leukaemia, colon, lung and gastric carcinomas, etc. (Ueda, H., et al., 1994, J. Antibiot. (Tokyo), Vol. 47(3), pp. 315-323; Kim et al., 1999, Oncogene, Vol. 18(15), pp. 246I-2470).
  • Psoriasis is a common chronic disfiguring skin disease which is characterised by well- demarcated, red, hardened scaly plaques: these may be limited or widespread.
  • the prevalence rate of psoriasis is approximately 2%, i.e., 12.5 million sufferers in the triad countries (US/Europe/Japan). While the disease is rarely fatal, it clearly has serious detrimental effects upon the quality of life of the subject: this is further compounded by the lack of effective therapies. Present treatments are either ineffective, cosmetically unacceptable, or possess undesired side effects. There is therefore a large unmet clinical need for effective and safe HDACis for this condition.
  • Psoriasis is a disease of complex etiology. Whilst there is clearly a genetic component, with a number of gene loci being involved, there are also undefined environmental triggers. Whatever the ultimate cause of psoriasis, at the cellular level, it is characterised by local T-cell mediated inflammation, by keratinocyte hyperproliferation, and by localised angiogenesis. These are all processes in which histone deacetylases have been implicated (see, e.g., Saunders, N. et al, 1999, Cancer Res., Vol. 59, No. 2 pp. 399-404; Bernhard, D. et al., 1999, FASEB J.. Vol. 13, No. 14, pp.
  • HDAC inhibitors may be of use in therapy for psoriasis.
  • Candidate HDACis may be screened, for example, using proliferation assays with T-cells and/or keratinocytes.
  • HDAC inhibitors are carbamic acid compounds comprising a sulfonamide linkage, as described, for example, in Watkins, C, et al., 2002, published international (PCT) patent application number WO 02/30879.
  • An especially promising compound is N-hydroxy-3-(3-phenylsulfamoyl-phenyl)-acrylamide (referred to herein as PXD-101).
  • HDACis suffer from one or more formulation problems, for example, low solubility in aqueous solutions, the need to employ unsuitably high or low pH in order to effect HDACi solubilisation, physical and/or chemical instability in aqueous solutions, physical and/or chemical instability upon later dilution, etc.
  • Compounds such as PXD-101 also suffer from these and other problems.
  • one aim of the present invention is the provision of improved pharmaceutical compositions (e.g., formulations and pre-formulations) which comprise PXD-101 or structurally similar compounds, which address one or more of the above and other problems.
  • improved pharmaceutical compositions e.g., formulations and pre-formulations
  • PXD-101 or structurally similar compounds
  • the inventors have found particular combinations of ingredients which, surprisingly and unexpectedly, yield pharmaceutical compositions that have greatly improved properties.
  • compositions offer one or more of the following advantages: (a) a greater concentration of HDACi;
  • composition (d) the ability to provide the composition as, for example, a ready-to-use solution, a concentrate for extemporaneous dilution, and/or a lyophilate/lyophilisate.
  • compositions comprising: (a) a HDACi (as defined herein), and (b) one or more of: cyclodextrin, arginine, and meglumine.
  • the HDACi is selected from compounds of the following formula, and pharmaceutically acceptable salts, solvates, amides, esters, ethers, chemically protected forms, and prodrugs thereof:
  • One aspect of the present invention pertains to a pharmaceutical composition (e.g., formulation, pre-formulation), as described herein, in a suitable container (e.g., vial, ampoule, intravenous (I.V.) infusion bag).
  • a pharmaceutical composition e.g., formulation, pre-formulation
  • a suitable container e.g., vial, ampoule, intravenous (I.V.) infusion bag.
  • One aspect of the present invention pertains to a vial or ampoule containing a pharmaceutical composition (e.g., formulation, pre-formulation), as described herein.
  • a pharmaceutical composition e.g., formulation, pre-formulation
  • One aspect of the present invention pertains to an intravenous (I.V.) infusion bag containing a pharmaceutical composition (e.g., formulation), as described herein.
  • a pharmaceutical composition e.g., formulation
  • One aspect of the present invention pertains to a solid dosage form (e.g., tablet, capsule, or gelatin tablet) containing a pharmaceutical composition containing a pharmaceutical composition (e.g., formulation), as described herein.
  • a solid dosage form e.g., tablet, capsule, or gelatin tablet
  • a pharmaceutical composition e.g., formulation
  • One aspect of the present invention pertains to a method of preparing a composition (e.g., pre-formulation, formulation) (as described herein) by combining: (a) a histone deacetylase inhibitor (HDACi) as defined herein, and (b) one or more of the following additional ingredients: cyclodextrin, arginine, and meglumine; and optionally one or more other additional pharmaceutically acceptable ingredients (as described herein).
  • HDACi histone deacetylase inhibitor
  • One aspect of the present invention pertains to a method of formulating a HDACi (as described herein) comprising the step of: combining said HDACi with one or more of the following additional ingredients: cyclodextrin, arginine, and meglumine (as described herein); and optionally one or more other additional pharmaceutically acceptable ingredients (as described herein).
  • One aspect of the present invention pertains to a method of increasing the concentration of a HDACi (as described herein) in a pharmaceutical composition, comprising the step of: formulating said HDACi with one or more of the following additional ingredients: cyclodextrin, arginine, and meglumine (as described herein); and optionally one or more other additional pharmaceutically acceptable ingredients (as described herein).
  • composition components as described herein e.g., a HDACi; one or more of cyclodextrin, arginine, and meglumine; etc.
  • One aspect of the present invention pertains to a pharmaceutical composition (e.g., pre-formulation, formulation), as described herein, for use in a method of treatment of the human or animal body by therapy.
  • a pharmaceutical composition e.g., pre-formulation, formulation
  • One aspect of the present invention pertains to use of the pharmaceutical composition components as described herein (e.g., a HDACi; one or more of cyclodextrin, arginine, and meglumine; etc.) in the manufacture of a medicament for the treatment of a condition, as described herein.
  • a pharmaceutical composition component e.g., a HDACi; one or more of cyclodextrin, arginine, and meglumine; etc.
  • One aspect of the present invention pertains to use of a pharmaceutical composition (e.g., pre-formulation), as described herein, in the manufacture of a medicament for the treatment of a condition, as described herein.
  • a pharmaceutical composition e.g., pre-formulation
  • One aspect of the present invention pertains to a method of treatment, comprising administering to a subject in need of treatment a pharmaceutical composition (e.g., formulation), as described herein.
  • a pharmaceutical composition e.g., formulation
  • One aspect of the present invention pertains to a method of (a) regulating (e.g., inhibiting) cell proliferation; (b) inhibiting cell cycle progression; (c) promoting apoptosis; or (d) a combination of one or more of these, in vitro or in vivo, comprising contacting a cell with a pharmaceutical composition (e.g., formulation) as described herein.
  • a pharmaceutical composition e.g., formulation
  • One aspect of the present invention pertains to a method of administering a HDACi, as defined herein, to a subject, comprising administering to said subject a pharmaceutical composition (e.g., formulation), as described herein.
  • a pharmaceutical composition e.g., formulation
  • kit or kit-of-parts
  • a pharmaceutical composition e.g., pre-formulation, formulation
  • suitable container preferably provided in a suitable container and/or with suitable packaging
  • instructions for use for example, written instructions on how to administer the formulation, etc.
  • kit or kit-of-parts
  • a pharmaceutical composition e.g., pre-formulation
  • suitable container preferably provided in a suitable container and/or with suitable packaging
  • instructions for use for example, written instructions on how to prepare a suitable pharmaceutical formulation from the composition (e.g., pre-formulation), and how to subsequently administer the formulation, etc.
  • Figure 1 is a phase solubility diagram for hydroxypropyl- ⁇ -cyclodextrin (HP- ⁇ -CD), and is a plot of HDACi (PXD-101) concentration (mg/mL) versus HP- ⁇ -CD concentration (mg/mL).
  • HP- ⁇ -CD hydroxypropyl- ⁇ -cyclodextrin
  • Figure 2 is a buffered pH cyclodextrin solubility profile, and is a plot of HDACi (PXD-101) concentration (mg/mL) versus pH, for 25% w/v HP- ⁇ -CD.
  • Figure 3 is a phase solubility diagram for the in situ salt formers arginine and meglumine, and is a plot of HDACi (PXD-101) concentration (mg/mL) versus salt former (arginine (diamonds) or meglumine (squares)) concentration (mg/mL).
  • HDACi PXD-101
  • Figure 5 is a pH profile diagram for the combination of cyclodextrin and in situ salt formers arginine and meglumine, and is a plot of HDACi (PXD-101) concentration (mg/mL) versus pH for phosphate buffer (diamonds), arginine (squares), or meglumine (triangles), each with 25% w/v HP- ⁇ -CD.
  • HDACi PXD-101
  • Figure 6 is a graph showing the mean Cmax ( ⁇ SD) of I. V. PXD101 on day 1, measured in 2-4 subjects at each dose level.
  • Figure 7 is a graph showing the mean AUC ( ⁇ SD) of I.V. PXD101 on day 1 , measured in 2-4 subjects at each dose level.
  • Figure 8 is a graph showing the mean clearance ( ⁇ SD) of I.V. PXD101 on day 1, measured in 2-4 subjects at each dose level.
  • Figure 9 is a Western blot showing histone H3 and H4 acetylation in peripheral blood mononuclear cells at the indicated times post-dose.
  • Figure 10 is a graph showing acetylation expressed as a densitometry measurement of H4 acetylation in PBMC samples relative to H4 in a treated cell line standard (A2780) as a function of time.
  • Figure 11 is a Western blot showing the expression of proteins (p19 SKP1 , p2i CIPWAF1 , Apaf-1 and vinculin) involved in cell-cycle arrest and apoptosis from lymphocytes prepared from a subject during cycles 2 and 4 of PXD101 treatment at 900 mg/m 2 .
  • proteins p19 SKP1 , p2i CIPWAF1 , Apaf-1 and vinculin
  • compositions which are suitable for administration to a subject (hereinafter referred to as “formulations"), as well as pharmaceutical compositions (e.g., lyophilates/lyophilisates, concentrates, etc.) from which such formulations may be prepared (hereinafter referred to as “pre-formulations").
  • formulations e.g., lyophilates/lyophilisates, concentrates, etc.
  • pre-formulations pharmaceutical compositions
  • the administration is parenteral administration.
  • the administration is administration by injection, including, for example, subcutaneous, intradermal, intramuscular, intravenous, intraarterial, intracardiac, intrathecal, intraspinal, intracapsular, subcapsular, intraorbital, intraperitoneal, intratracheal, subcuticular, intraarticular, subarachnoid, and intrasternal injection.
  • the administration is intravenous administration. In one embodiment, the administration is administration by intravenous injection. In one embodiment, the administration is administration by infusion. In one embodiment, the administration is administration by intravenous infusion.
  • the composition e.g., pre-formulation
  • a saline or glucose solution e.g., into a typical 1 L intravenous saline or glucose bag
  • the resulting composition e.g., formulation
  • “Infusion” differs from “injection” in that the term “infusion” describes the passive introduction of a substance (e.g., a fluid, HDACi, electrolyte, etc.) into a vein or tissues by gravitational force, whereas the term “injection” describes the active introduction of a substance into a vein or tissues by additional forces, e.g., the pressue in a syringe.
  • a substance e.g., a fluid, HDACi, electrolyte, etc.
  • injection describes the active introduction of a substance into a vein or tissues by additional forces, e.g., the pressue in a syringe.
  • Administration can be effected in one dose, continuously or intermittently (e.g., in divided doses at appropriate intervals) throughout the course of treatment. Methods of determining the most effective means and dosage of administration are well known to those of skill in the art and will vary with the particular formulation used for therapy, the purpose of the therapy, the target cell(s) being treated, and the subject being treated.
  • Single or multiple administrations can be carried out with the dose level and pattern being selected by the treating physician, clinician, or veterinarian.
  • the subject is an animal; a mammal; a placental mammal, a rodent (e.g., a guinea pig, a hamster, a rat, a mouse), murine (e.g., a mouse), a lagomorph (e.g., a rabbit), canine (e.g., a dog), feline (e.g., a cat), equine (e.g., a horse), porcine
  • a rodent e.g., a guinea pig, a hamster, a rat, a mouse
  • murine e.g., a mouse
  • a lagomorph e.g., a rabbit
  • canine e.g., a dog
  • feline e.g., a cat
  • equine e.g., a horse
  • the subject is a human, i.e., a living human, including a living human foetus, a living human child, and a living human adult.
  • compositions of the present invention comprise, at least, the following components:
  • (b) is cyclodextrin. In one embodiment, (b) is arginine. In one embodiment, (b) is meglumine. In one embodiment, (b) is cyclodextrin and arginine. In one embodiment, (b) is cyclodextrin and meglumine. In one embodiment, (b) is arginine and meglumine. In one embodiment, (b) is cyclodextrin, arginine, and meglumine.
  • the pharmaceutical composition further comprises one or more other additional ingredients (e.g., pharmaceutically acceptable carriers, etc.).
  • additional ingredients e.g., pharmaceutically acceptable carriers, etc.
  • compositions of the present invention comprise a HDACi which is a carbamic acid compound comprising a sulfonamide linkage.
  • HDACi is a carbamic acid compound comprising a sulfonamide linkage. Examples of such HDACis are shown, for example, in Watkins et al., 2002, international (PCT) patent publication number WO 02/30879.
  • the HDACi is a carbamic acid compound comprising a sulfonamide linkage, as defined in Watkins et al., 2002, published international (PCT) patent application number WO 02/30879.
  • the HDACi is selected from compounds of the following formula:
  • A is independently:
  • J is independently:
  • R N is independently:
  • the HDACi is also an HDAC inhibitor.
  • HDACi is an HDAC inhibitor.
  • assays which may conveniently be used to assess HDAC inhibition are described in Watkins et al., 2002, international (PCT) patent publication number WO 02/30879.
  • the carbamic acid group, -C(O)NHOH is unmodified (e.g., is not an ester).
  • the group A is independently C 6-20 carboaryl or C 5-2 oheteroaryl and is unsubstituted or substituted.
  • A is independently C 6- i 0 carboaryl or C 5-10 heteroaryl, and is unsubstituted or substituted.
  • A is independently C 6 carboaryl or C 5-6 heteroaryl, and is unsubstituted or substituted.
  • A is independently derived from: benzene, naphthalene, carbazole, pyridine, pyrrole, furan, thiophene, or thiazole; and is unsubstituted or substituted.
  • derived from refers to compounds which have the same ring atoms, and in the same orientation/configuration, as the parent cyclic group, and so include, for example, hydrogenated (e.g., partially saturated, fully saturated), carbonyl-substituted, and other substituted derivatives.
  • hydrogenated e.g., partially saturated, fully saturated
  • carbonyl-substituted e.g., carbonyl-substituted
  • A is independently: phenyl, naphthyl, carbazolyl, pyridinyl, pyrrolyl, furanyl, thienyl, or thiazolyl; and is unsubstituted or substituted.
  • A is independently phenyl, and is unsubstituted or substituted (e.g., with 1 , 2, 3, 4, or 5 substituents).
  • A is independently:
  • n is 0, 1, 2, 3, 4, or 5. In one embodiment, n is 0, 1 , 2, 3, or 4. In one embodiment, n is 0, 1 , 2, or 3. In one embodiment, n is 0, 1 , or 2. In one embodiment, n is 0 or 1. In one embodiment, n is 1 , 2, 3, 4, or 5. In one embodiment, n is 1, 2, 3, or 4. In one embodiment, n is 1 , 2, or 3. In one embodiment, n is 1 , or 2. In one embodiment, n is 5. In one embodiment, n is 4. In one embodiment, n is 3. In one embodiment, n is 2. In one embodiment, n is 1. In one embodiment, n is 0.
  • each of the substituents, R A is independently as defined below under the heading "The HDACi: Substituents”.
  • A is unsubstituted.
  • the group Q 1 is independently a covalent bond, C 1-7 alkylene, or C 2-7 alkenylene, and is unsubstituted or substituted.
  • Q 1 is independently a covalent bond or C 1-7 alkylene, and is unsubstituted or substituted.
  • alkylene refers to bidentate moieties obtained by removing two hydrogen atoms, either both from the same carbon atom, or one from each of two different carbon atoms, of a saturated hydrocarbon compound (a compound consisting of carbon atoms and hydrogen atoms) having from 1 to 20 carbon atoms (unless otherwise specified), which may be aliphatic (i.e., linear or branched) or alicyclic (i.e., cyclic but not aromatic).
  • alkenylene refers to bidentate moieties obtained by removing two hydrogen atoms, either both from the same carbon atom, or one from each of two different carbon atoms, of a hydrocarbon compound (a compound consisting of carbon atoms and hydrogen atoms) having from 1 to 20 carbon atoms (unless otherwise specified) and having at least one carbon-carbon double bond, and which may be aliphatic (i.e., linear or branched) or alicyclic (i.e., cyclic but not aromatic).
  • a hydrocarbon compound a compound consisting of carbon atoms and hydrogen atoms
  • Q 1 is independently Ci -7 alkylene or C 2-7 alkenylene, and is unsubstituted or substituted. In one embodiment, Q 1 is independently or C 2-4 alkenylene, and is unsubstituted or substituted. In one embodiment, Q 1 is independently C 1-3 alkylene or C 2-3 alkenylene, and is unsubstituted or substituted.
  • Q 1 is independently C 2-7 alkylene or C 2-7 alkenylene, and is unsubstituted or substituted. In one embodiment, Q 1 is independently C 2-4 alkylene or C 2-4 alkenylene, and is unsubstituted or substituted.
  • Q 1 is independently C 2-3 alkylene or C 2-3 alkenylene, and is unsubstituted or substituted.
  • Q 1 is independently C 2 alkylene or C 2 alkenylene, and is unsubstituted or substituted.
  • Q 1 is independently C 1-7 alkylene, and is unsubstituted or substituted.
  • Q 1 is independently C 1-4 alkylene, and is unsubstituted or substituted.
  • Q 1 is independently Ci -3 alkylene, and is unsubstituted or substituted. In one embodiment, Q 1 is independently C 2-7 alkylene, and is unsubstituted or substituted.
  • Q 1 is independently C 2-4 alkylene, and is unsubstituted or substituted.
  • Q 1 is independently C 2-3 alkylene, and is unsubstituted or substituted.
  • Q 1 is independently C 2 alkylene, and is unsubstituted or substituted.
  • Q 1 is independently aliphatic. In one embodiment, Q 1 is independently linear. In one embodiment, Q 1 is independently branched.
  • Q 1 is independently unsubstituted.
  • the group R N is independently: -H
  • R N is independently: -H
  • C 1-7 alkyl C 6-2 ocarboaryl, or C 6 - 2 ocarboaryl-C 1-7 alkyl, and is unsubstituted or substituted.
  • the or each C 6-2 ocarboaryl group is a C 6- iocarboaryl group. In one embodiment, the or each C 5-2 oheteroaryl group is a C 5-10 heteroaryl group.
  • the or each C 6 . 2 ocarboaryl group is a C 6 carboaryl group. In one embodiment, the or each C 5 . 2 oheteroaryl group is a C 5-6 heteroaryl group.
  • the C 3 . 2 oheterocyclyl group is a C 3- i 0 heterocyclyl group. In one embodiment, the C 3-2 oheterocyclyl group is a C 5-7 heterocyclyl group.
  • the or each C 1-7 alkyl group is a C 1-4 alkyl group. In one embodiment, the or each C 1-7 alkyl group is a Ci -3 alkyl group. In one embodiment, the or each C 1-7 alkyl group is a C 1-2 alkyl group.
  • the or each alkyl group is independently aliphatic. In one embodiment, the or each alkyl group is independently linear. In one embodiment, the or each alkyl group is independently branched.
  • the or each alkyl group is independently saturated.
  • the or each alkyl group is independently partially unsaturated.
  • R N is independently unsubstituted.
  • R N is independently: -H or C 1-7 alkyl, and is unsubstituted or substituted.
  • R N is independently: -H or unsubstituted Ci -4 alkyl.
  • R N is independently: -H or unsubstituted saturated Ci -4 alkyl.
  • R N is independently: -H or unsubstituted saturated aliphatic C 1-4 alkyl.
  • R N is independently: -H, -Me, -Et, -nPr, -iPr, -nBu, -sBu, -iBu, or -tBu. In one embodiment, R N is independently: -H, -Me, or -Et. In one embodiment, R N is independently: -H or -Me.
  • the group Q 2 is independently:
  • Q 2 is independently:
  • Ci ⁇ alkylene-Ce-iocarboarylene-Ca-T-alkenylene Ci ⁇ alkylene-Ce-iocarboarylene-Ca-T-alkenylene
  • C2 -7 alkenylene-C 6 . 10 carboarylene-C 2-7 alkenylene, or C2 -7 alkenylene-C 5- ioheteroarylene-C 2-7 alkenylene, and is unsubstituted or substituted.
  • Q 2 is independently:
  • Q 2 is independently: phenylene, phenylene-C 1-7 alkylene, phenylene-C 2-7 alkenylene, C 1-7 alkylene-phenylene, C 2-7 alkenylene-phenylene, C 1-7 alkylene-phenylene-C 1-7 alkylene, C 2-7 alkenylene-phenylene-C 1-7 alkylene,
  • Q 2 is independently: phenylene, phenylene-C 1-7 alkylene, or phenylene-C 2-7 alkenylene, and is unsubstituted or substituted.
  • the or each Ci -7 alkylene group is a C 1-4 alkylene group. In one embodiment, the or each C 1-7 alkylene group is a C 1-3 alkylene group. In one embodiment, the or each C 1-7 alkylene group is a C 1-2 alkylene group. In one embodiment, the or each C 1-7 alkylene group is a C 2 alkylene group.
  • the or each C 1-7 alkenylene group is a C 2-4 alkenylene group. In one embodiment, the or each C 1-7 alkenylene group is a C 2-3 alkenylene group. In one embodiment, the or each C 1-7 alkenylene group is a C 2 alkenylene group.
  • the phenylene linkage is meta or para. In one embodiment, the phenylene linkage is meta. In one embodiment, the phenylene linkage is para.
  • Q 2 is independently ortho-, meta-, or para-phenylene-ethylene, and is unsubstituted or substituted.
  • Q 2 is independently ortho-, meta-, or para-phenylene-ethenylene, and is unsubstituted or substituted.
  • the ethenylene is cis- or trans-ethenylene. In one embodiment, the ethenylene is trans-ethenylene. In one embodiment, Q 2 is independently meta-phenylene-ethenylene, and is unsubstituted or substituted.
  • Q 2 is unsubsituted.
  • Q 2 is independently:
  • Q 2 is independently:
  • each of the substituents (e.g., on A, Q 1 , R N , Q 2 ) (e.g., R A ), if present, is independently selected from:
  • each of the substituents (e.g., on A, Q 1 , R N , Q 2 ) (e.g., R A ), if present, is independently selected from:
  • R 1 is independently as defined in (24), (25), (26) or (27);
  • R 4 is independently -H, or as defined in (24), (25), (26) or (27); (5) -F, -Cl, -Br, -I;
  • R 7 is independently as defined in (24), (25), (26) or (27);
  • each of R 8 and R 9 is independently -H; or as defined in (24), (25), (26) or (27); or R 8 and R 9 taken together with the nitrogen atom to which they are attached form a ring having from 3 to 7 ring atoms;
  • R 10 and R 11 taken together with the nitrogen atom to which they are attached form a ring having from 3 to 7 ring atoms;
  • R 14 is independently -H; or as defined in (24), (25), (26) or (27); and each of R 15 and R 16 is independently -H; or as defined in (24), (25), (26) or (27); or R 15 and R 16 taken together with the nitrogen atom to which they are attached form a ring having from 3 to 7 ring atoms;
  • R 18 is independently -H, or as defined in (24), (25), (26) or (27); (18) -SO 2 R 19 , wherein R 19 is independently as defined in (24), (25), (26) or (27);
  • (22) NR 23 , wherein R 23 is independently -H; or as defined in (24), (25), (26) or (27);
  • (23) NOR 24 , wherein R 24 is independently -H; or as defined in (24), (25), (26) or (27);
  • C 5-2 oaryl-C 1-7 alkyl for example, wherein C 5-20 aryl is as defined in (25); unsubstituted or substituted, e.g., with one or more groups as defined in (1) to (28); (25) C 5-2 oaryl, including C 6-20 carboaryl and C 5-2 oheteroaryl; unsubstituted or substituted, e.g., with one or more groups as defined in (1) to (28);
  • (26) C 3-20 heterocyclyl; unsubstituted or substituted, e.g., with one or more groups as defined in (1) to (28);
  • R 25 is independently saturated C ⁇ alkyl, and is independently unsubstituted or substituted with one or more (e.g., 1, 2, 3, 4) substituents as defined in (5).
  • (27) include the following: halo-C 1-7 alkyl; amino-C 1-7 alkyl (e.g., -(CH 2 ) w -amino, w is 1 , 2, 3, or 4); amido-C 1-7 alkyl (e.g., -(CH 2 ) w -amido, w is 1 , 2, 3, or 4); acylamido-C 1-7 alkyl (e.g., -(CH 2 ) w -acylamido, w is 1 , 2, 3, or 4); carboxy-C 1-7 alkyl (e.g., -(CH 2 ) W -COOH, w is 1 , 2, 3, or 4); acyl-C 1-7 alkyl (e.g., -(CH 2 ) w -acyl, w is 1 , 2, 3, or 4); hydroxy-C 1-7 alkyl (e.g., -(CH 2 ) W -OH, w
  • each of the substituents (e.g., on A, Q 1 , R N , Q 2 ) (e.g., R A ), if present, is independently selected from:
  • -CF 3 -CHF 2 , -CH 2 F, -CCI 3 , -CBr 3 , -CH 2 CH 2 F, -CH 2 CHF 2 , and -CH 2 CF 3 ; -CH 2 OH, -CH 2 OMe, -CH 2 OEt, -CH 2 NH 2 , -CH 2 NMe 2 ;
  • the HDACi is selected from compounds of the following formula:
  • A is independently: phenyl, and is unsubstituted or substituted;
  • Q 1 is independently: a covalent bond,
  • R N is independently: ⁇ -H, or
  • Q 2 is independently: phenylene-C 1-4 alkylene, - phenylene-C 2-4 alkenylene, and is unsubstituted; and pharmaceutically acceptable salts, solvates, amides, esters, ethers, chemically protected forms, and prodrugs thereof.
  • the HDACi is selected from compounds of the following formulae, and substituted analogs thereof (e.g., where the terminal phenyl group is substituted, where the sulfonamide nitrogen is substituted, etc., e.g., with one or more substituents as defined above under the heading "The HDACi: Substituents"), and pharmaceutically acceptable salts, solvates, amides, esters, ethers, chemically protected forms, and prodrugs thereof:
  • the HDACi is selected from compounds of the following formula, and substituted analogs thereof (e.g., where the terminal phenyl group is substituted, where the sulfonamide nitrogen is substituted, etc., e.g., with one or more substituents as defined above under the heading "The HDACi: Substituents"), and pharmaceutically acceptable salts, solvates, amides, esters, ethers, chemically protected forms, and prodrugs thereof:
  • the HDACi is selected from the following compound, and pharmaceutically acceptable salts, solvates, amides, esters, ethers, chemically protected forms, and prodrugs thereof:
  • Certain compounds may exist in one or more particular geometric, optical, enantiomeric, diasteriomeric, epimeric, atropic, stereoisomeric, tautomeric, conformational, or anomeric forms, including but not limited to, cis- and trans-forms; E- and Z-forms; c-, t-, and r- forms; endo- and exo-forms; R-, S-, and meso-forms; D- and L-forms; d- and l-forms; (+) and (-) forms; keto-, enol-, and enolate-forms; syn- and anti-forms; synclinal- and anticlinal-forms; ⁇ - and ⁇ -forms; axial and equatorial forms; boat-, chair-, twist-, envelope-, and halfchair-forms; and combinations thereof, hereinafter collectively referred to as "isomers” (or "isomeric forms").
  • isomers are structural (or constitutional) isomers (i.e., isomers which differ in the connections between atoms rather than merely by the position of atoms in space).
  • a reference to a methoxy group, -OCH 3 is not to be construed as a reference to its structural isomer, a hydroxymethyl group, -CH 2 OH.
  • a reference to ortho-chlorophenyl is not to be construed as a reference to its structural isomer, meta-chlorophenyl.
  • Ci -7 alkyl includes n-propyl and iso-propyl; butyl includes n-, iso-, sec-, and tert-butyl; methoxyphenyl includes ortho-, meta-, and para-methoxyphenyl).
  • keto/enoi (illustrated below), imine/enamine, amide/imino alcohol, amidine/amidine, nitroso/oxime, thioketone/enethiol, N-nitroso/hyroxyazo, and nitro/aci-nitro.
  • H may be in any isotopic form, including 1 H, 2 H (D), and 3 H (T); C may be in any isotopic form, including 12 C, 13 C, and 14 C; O may be in any isotopic form, including 16 O and 18 O; and the like.
  • a reference to a particular compound includes all such isomeric forms, including (wholly or partially) racemic and other mixtures thereof.
  • a corresponding salt of the active compound for example, a pharmaceutically acceptable salt.
  • a pharmaceutically acceptable salt examples are discussed in Berge et al., 1977, "Pharmaceutically Acceptable Salts," J. Pharm. ScL, Vol. 66, pp. 1-19.
  • a salt may be formed with a suitable cation.
  • suitable inorganic cations include, but are not limited to, alkali metal ions such as Na + and K + , alkaline earth cations such as Ca 2+ and Mg 2+ , and other cations such as Al +3 .
  • Suitable organic cations include, but are not limited to, ammonium ion (i.e., NH 4 + ) and substituted ammonium ions (e.g., NH 3 R + , NH 2 R 2 + , NHR 3 + , NR 4 + ).
  • suitable substituted ammonium ions are those derived from: ethylamine, diethylamine, dicyclohexylamine, triethylamine, butylamine, ethylenediamine, ethanolamine, diethanolamine, piperazine, benzylamine, phenylbenzylamine, choline, meglumine, and tromethamine, as well as amino acids, such as lysine and arginine.
  • An example of a common quaternary ammonium ion is N(CH 3 ) 4 + .
  • a salt may be formed with a suitable anion.
  • suitable inorganic anions include, but are not limited to, those derived from the following inorganic acids: hydrochloric, hydrobromic, hydroiodic, sulfuric, sulfurous, nitric, nitrous, phosphoric, and phosphorous.
  • Suitable organic anions include, but are not limited to, those derived from the following organic acids: 2-acetyoxybenzoic, acetic, ascorbic, aspartic, benzoic, camphorsulfonic, cinnamic, citric, edetic, ethanedisulfonic, ethanesulfonic, fumaric, glucheptonic, gluconic, glutamic, glycolic, hydroxymaleic, hydroxynaphthalene carboxylic, isethionic, lactic, lactobionic, lauric, maleic, malic, methanesulfonic, mucic, oleic, oxalic, palmitic, pamoic, pantothenic, phenylacetic, phenylsulfonic, propionic, pyruvic, salicylic, stearic, succinic, sulfanilic, tartaric, toluenesulfonic, and valeric.
  • solvate is used herein in the conventional sense to refer to a complex of solute (e.g., active compound, salt of active compound) and solvent. If the solvent is water, the solvate may be conveniently referred to as a hydrate, for example, a mono-hydrate, a di-hydrate, a tri-hydrate, etc.
  • chemically protected form is used herein in the conventional chemical sense and pertains to a compound in which one or more reactive functional groups are protected from undesirable chemical reactions under specified conditions (e.g., pH, temperature, radiation, solvent, and the like).
  • specified conditions e.g., pH, temperature, radiation, solvent, and the like.
  • well known chemical methods are employed to reversibly render unreactive a functional group, which otherwise would be reactive, under specified conditions.
  • one or more reactive functional groups are in the form of a protected or protecting group (also known as a masked or masking group or a blocked or blocking group).
  • proHDACi it may be convenient or desirable to prepare, purify, and/or handle the active compound in the form of a proHDACi.
  • proHDACi refers to a compound which, when metabolised (e.g., in vivo), yields the desired active compound.
  • the proHDACi is inactive, or less active than the active compound, but may provide advantageous handling, administration, or metabolic properties.
  • cyclodextrin as used herein (e.g., in connection with component (b)), relates to both cyclodextrins per se, and cyclodextrin derivatives, including, for example, the cyclodextrin derivatives described herein.
  • Cyclodextrins also known as cycloamyloses, cycloglucans, and Schardinger dextrins, are naturally occurring clathrates obtained, for example, from the action of Bacillus macerans amylase on starch to form homogenous cyclic ⁇ -(1 ⁇ 4) linked glucopyranose units, ⁇ -, ⁇ -, and ⁇ -cyclodextrins are composed of six, seven, and eight units, respectively, and have molecular weights of 972.84, 1134.98, and 1297.12 g/mol, respectively. Cyclodextrins have hydrophobic cavities and form inclusion compounds with organic substance, salts, and halogens in the solid state or in aqueous solutions.
  • a range of cyclodextrin derivatives are known, for example, where one or more of the primary and/or secondary pendant hydroxy (-OH) groups have been derivatised, for example, to form ether groups (e.g., dimethyl ether; hydroxyethyl ether; 2-hydroxypropyl ether; carboxymethyl ether; carboxyethyl ether; glucosyl ether; maltosyl ether; sulfobutyl ether).
  • Molar substitution ratios of, for example, 0.6, 0.8, and 1.0 (e.g., 0.5-1.0) are common.
  • the cyclodextrin is selected from: ⁇ -cyclodextrin; ⁇ -cyclodextrin; ⁇ -cyclodextrin;
  • C 1-4 alkyl groups examples include -Me, -Et, -nPr, -iPr, and -cPr.
  • saccharide ethers examples include glucosyl and maltosyl ethers.
  • An especially preferred cyclodextin is: hydroxypropyl- ⁇ -cyclodextrin.
  • the cyclodextrin has a purity of pharmaceutical grade or equivalent.
  • cyclodextrins and cyclodextrin derivatives may be obtained, for example, from Wacker-Chemie GmbH, Kunststoff, Germany: ⁇ -cyclodextrin (Cavamax® W6 pharma); ⁇ -cyclodextrin (Cavamax® W8 pharma);
  • Hydroxypropyl- ⁇ -cyclodextrin (Cavasol® W6 HP TL); Hydroxypropyl- ⁇ -cyclodextrin (Cavasol® W7 HP pharma); Hydroxypropyl-Y-cyclodextrin (Cavasol® W8 HP pharma).
  • terminal phenyl group of PXD-101 (or the optionally substituted terminal phenyl group of analogs of PXD-101) forms a complex with cyclodextrin, such as hydroxypropyl- ⁇ - cyclodextrin.
  • Arginine also known as L-arginine, 2-amino-5-guanidinovaleric acid, and (S)-2-amino-5- [(aminoiminornethyl)-amino]pentanoic acid, has a molecular weight of 174.20. It is soluble in water (a saturated aqueous solution contains 15% w/w at 21 0 C) and is alkaline in nature (but less alkaline than meglumine). It is often provided as an acid addition salt, for example, as the hydrochloride salt. Arginine is well tolerated in humans at doses up to 30 g/kg, for example, when given as a nutritional additive.
  • the arginine is free arginine or a pharmaceutically acceptable salt of arginine.
  • the arginine is L-arginine.
  • the arginine is free L-arginine or a pharmaceutically acceptable salt of L-arginine.
  • the arginine has a purity of pharmaceutical grade or equivalent.
  • L-arginine for HDACi formulation (conforming to both European and United States standards) may be obtained, for example, from Ajinomoto, Kanagawa, Japan (Catalog No. 2).
  • Meglumine also known as N-methylglucamine, 1-deoxy-1-(methylamino)-D-glucitol, and N-methyl-D-glucamine, has a molecular weight of 195.21 g/mol and a melting point of about 129-131 0 C. It is soluble in water ( ⁇ 100 g in 100 ml. at 25°C) and is alkaline in nature (and is more alkaline than arginine) (pH ⁇ 10.5 for a 1 wt% aqueous solution). It forms salts with acids and complexes with metals, and is used in many pharmaceutical formulations.
  • the meglumine is free meglumine or a pharmaceutically acceptable salt of meglumine.
  • the meglumine has a purity of pharmaceutical grade or equivalent.
  • Meglumine for HDACi formulation (conforming to both European and United States standards) may be obtained, for example, from Merck KgaA, Germany.
  • the pharmaceutical composition further comprises one or more other additional pharmaceutically acceptable ingredients (e.g., pharmaceutically acceptable carriers, etc.)
  • additional pharmaceutically acceptable ingredients e.g., pharmaceutically acceptable carriers, etc.
  • the pharmaceutical composition additionally comprises one or more other pharmaceutically acceptable ingredients well known to those skilled in the art, including, but not limited to, pharmaceutically acceptable carriers, diluents, excipients, adjuvants, buffers, pH modifiers, preservatives, anti-oxidants, bacteriostats, stabilisers, suspending agents, solubilisers, surfactants (e.g., wetting agents), colouring agents, and isotonicizing solutes (i.e., which render the formulation isotonic with the blood, or other relevant bodily fluid, of the intended recipient).
  • suitable carriers, diluents, excipients, etc. can be found in standard pharmaceutical texts.
  • pharmaceutically acceptable refers to compounds, ingredients, materials, compositions, dosage forms, etc., which are, within the scope of sound medical judgment, suitable for use in contact with the tissues of the subject in question (e.g., human) without excessive undesired toxicity, irritation, allergic response, or other problem or complication, commensurate with a reasonable benefit/risk ratio.
  • Each carrier, diluent, excipient, etc. must also be “acceptable” in the sense of being compatible with the other ingredients of the composition.
  • the composition further comprises other active agents, for example, other therapeutic or prophylactic agents.
  • formulation describes a material that is in a form (e.g., a liquid) that is ready for administration
  • pre-formulation describes a material (e.g., lyophilate/lyophilisate, concentrate, etc.) from which a formulation may be prepared (e.g., by re-hydration, dilution, etc.).
  • the composition e.g., formulation, pre-formulation
  • a liquid e.g., at room temperature, i.e., 25°C and standard atmospheric pressure, i.e., 1.01325 bar).
  • the liquid composition may be a solution, a suspension, an emulsion, etc., in which the HDACi and other components (e.g., cyclodextrin, arginine, meglumine, etc.) are dissolved, suspended, or otherwise provided (e.g., in a liposome or other microparticulate).
  • HDACi and other components e.g., cyclodextrin, arginine, meglumine, etc.
  • the composition e.g., formulation, pre-formulation
  • is an aqueous liquid e.g., comprising at least 30% w/w water, e.g., at least 50% w/w water, at least 70% w/w water).
  • the composition e.g., formulation, pre-formulation
  • an aqueous isotonic liquid e.g., isotonic with blood.
  • the composition e.g., formulation, pre-formulation
  • sterile and pyrogen-free i.e., free of pyrogens
  • the composition is a liquid concentrate from which a formulation may be prepared, for example, by dilution.
  • the composition e.g., pre-formulation
  • is a solid e.g., at room temperature, i.e., 25 0 C and standard atmospheric pressure, i.e., 1.01325 bar
  • a formulation may be prepared, for example, by hydration (or re-hydration), optionally followed by further dilution.
  • Materials suitable for dilution, hydration, and/or re-hydration include, for example, water-for-injection, aqueous saline solution (e.g. 0.9% w/v NaCI), aqueous glucose solution e.g., 5% w/v glucose BP), saline for injection/infusion, glucose for injection/infusion, Ringer's solution, lactated Ringer's solution, etc.
  • aqueous saline solution e.g. 0.9% w/v NaCI
  • aqueous glucose solution e.g., 5% w/v glucose BP
  • saline for injection/infusion glucose for injection/infusion
  • Ringer's solution e.g., 5% w/v glucose BP
  • Suitable saline solution (“saline for infusion", 0.9% w/v sodium chloride BP) may be obtained, for example, from Baxter Healthcare Ltd, Thetford, Norfolk, UK (Product Code FUE1322).
  • Suitable glucose solution (“glucose for infusion", 5% w/v glucose BP) may be obtained, for example, from Baxter Healthcare Ltd, Thetford, Norfolk, UK (Product Code FUE1322).
  • compositions e.g., formulations, pre-formulations
  • the pharmaceutical formulation may be prepared, e.g., from a pre-formulation, extemporaneously, e.g., immediately prior to use, for example, in an intravenous (I.V.) infusion bag.
  • I.V. intravenous
  • One aspect of the present in invention pertains to a pharmaceutical composition (e.g., formulation, pre-formulation), as described herein, in a suitable container (e.g., vial, ampoule, intravenous (I.V.) infusion bag).
  • a pharmaceutical composition e.g., formulation, pre-formulation
  • a suitable container e.g., vial, ampoule, intravenous (I.V.) infusion bag.
  • One aspect of the present in invention pertains to a vial or ampoule containing a pharmaceutical composition (e.g., formulation, pre-formulation), as described herein.
  • a pharmaceutical composition e.g., formulation, pre-formulation
  • One aspect of the present in invention pertains to a vial or ampoule containing a pharmaceutical pre-formulation (e.g., a liquid concentrate), as described herein.
  • a pharmaceutical pre-formulation e.g., a liquid concentrate
  • One aspect of the present in invention pertains to an intravenous (I.V.) infusion bag containing a pharmaceutical composition (e.g., formulation), as described herein.
  • a pharmaceutical composition e.g., formulation
  • the pharmaceutical formulation comprises a therapeutically-effective amount of HDACi.
  • the pharmaceutical composition comprises an amount of HDACi so that, upon subsequent formation of a pharmaceutical formulation from said pharmaceutical composition (e.g., by dilution, hydration, re-hydration, etc.), said pharmaceutical formulation comprises a therapeutically-effective amount of HDACi.
  • HDACi and concentrations of HDACi in formulations and compositions
  • appropriate dosages of the HDACi can vary from subject to subject. Determining the optimal dosage will generally involve the balancing of the level of therapeutic benefit against any risk or deleterious side effects.
  • the selected dosage level will depend on a variety of factors including, but not limited to, the activity of the particular compound, the route of administration, the time of administration, the rate of excretion of the compound, the duration of the treatment, other HDACis, compounds, and/or materials used in combination with the HDACi, the severity of the condition, and the species, sex, age, weight, condition, general health, and prior medical history of the subject.
  • the amount of HDACi and route of administration will ultimately be at the discretion of the physician, veterinarian, or clinician, although generally the dosage will be selected to achieve local concentrations at the site of action that achieve the desired effect without causing substantial harmful or deleterious side-effects.
  • An example of a preferred dosage is 150 ⁇ mol/kg.
  • a HDACi e.g., PXD-101
  • a molecular weight of 318 g/mol that is -47.7 mg/kg.
  • a 70 kg subject that is -3.3 g.
  • a suitable liquid concentrate (e.g., pre-formulation) may have a concentration of 10-100 times greater than the desired formulation, and so have a concentration of ⁇ 33-330 g/L (-33-330 mg/mL, e.g, -50 mg/mL), or ⁇ 0.1-1.0 M.
  • the composition (e.g., formulation) has a HDACi concentration of at least 0.01 , 0.02, 0.05, 0.1 , 0.2, 0.5, 1.0, 2.0, or 5.0 mg/mL
  • the composition e.g., formulation
  • the HDACi concentration is 0.1-10 mg/mL.
  • the HDACi concentration is 0.5-10 mg/mL.
  • the HDACi concentration is 1.0-10 mg/mL.
  • the HDACi concentration is 0.1-5 mg/mL In one embodiment, the HDACi concentration is 0.5-5 mg/mL.
  • the HDACi concentration is 1.0-5 mg/mL.
  • the composition e.g., formulation
  • the composition e.g., formulation
  • the HDACi concentration is 0.3-30 mM.
  • the HDACi concentration is 1.0-30 mM.
  • the HDACi concentration is 2.0-30 mM. In one embodiment, the HDACi concentration is 3.0-30 mM.
  • the HDACi concentration is 0.3-15 mM.
  • the HDACi concentration is 1.0-15 mM.
  • the HDACi concentration is 2.0-15 mM.
  • the HDACi concentration is 3.0-15 mM.
  • composition e.g., pre-formuiation
  • the composition may have a HDACi concentration that is, for example, 1-1000 times greater than the HDACi concentration of the corresponding formulation.
  • the composition e.g., pre-formulation
  • the composition e.g., pre-formulation
  • the HDACi concentration is 10-500 times greater.
  • the HDACi concentration is 10-200 times greater.
  • the HDACi concentration is 10-100 times greater.
  • the HDACi concentration is 10-50 times greater.
  • the HDACi concentration is 10-20 times greater.
  • the composition e.g., pre-formulation
  • the composition has a HDACi concentration of 30-600 mM (corresponding to 10-20 times 3.0-30 mM).
  • the composition (e.g., pre-formulation) has a HDACi concentration of at least 0.1 , 0.2, 0.5, 1.0, 2.0, 5.0, 10, 20, 30, or 50 mg/mL.
  • the composition e.g., pre-formulation
  • the HDACi concentration is 5-500 mg/mL. In one embodiment, the HDACi concentration is 10-500 mg/mL. In one embodiment, the HDACi concentration is 20-500 mg/mL. In one embodiment, the HDACi concentration is 30-500 mg/mL. In one embodiment, the HDACi concentration is 5-300 mg/mL. In one embodiment, the HDACi concentration is 10-300 mg/mL. In one embodiment, the HDACi concentration is 20-300 mg/mL. In one embodiment, the HDACi concentration is 30-300 mg/mL. In one embodiment, the HDACi concentration is ⁇ 50 mg/mL.
  • the composition (e.g., pre-formulation) has a HDACi concentration of at least 0.3, 0.5, 1.0, 1.5, 2.0, 3.0, 5.0, 10, 30, 50, 100 mM. In one embodiment, the composition (e.g., pre-formulation) has a HDACi concentration of up to and including 3000, 1000, 500, 300, 100, 50, 30, 20, 15, 10, 5, or 3 mM.
  • the HDACi concentration is 10-1000 mM.
  • the HDACi concentration is 30-1000 mM. In one embodiment, the HDACi concentration is 50-1000 mM.
  • the HDACi concentration is 100-1000 mM.
  • the HDACi concentration is 10-500 mM.
  • the HDACi concentration is 30-500 mM.
  • the HDACi concentration is 50-500 mM. In one embodiment, the HDACi concentration is 100-500 mM.
  • the HDACi is provided in the form of a salt
  • the amount is calculated on the basis of the parent compound. Consequently, the above values (e.g., 30-300 mg/mL, ⁇ 50 mg/mL) pertain to the parent compound, and not, for example, a salt thereof.
  • the molar ratio of cyclodextrin to HDACi is at least 0.5, 0.7, 0.8, 0.9, 1.0, 1.1 , 1.2, 1.3, 1.4, or 1.5.
  • the molar ratio of cyclodextrin to HDACi is up to and including 5, 4, 3.5, 3, 2.5, 2.0, 1.9, 1.8, 1.7, 1.6, or 1.5.
  • the molar ratio is 0.5-5. In one embodiment, the molar ratio is 0.8-4.
  • the molar ratio is 1-3.
  • the molar ratio is 1.2-2.5.
  • the molar ratio is 1.4-2.
  • the molar ratio is 1.5-1.9
  • An example of a preferred HDACi concentration for a composition is ⁇ 10 mM. If that composition (e.g, pre-formulation, formulation) is to have a cyclodextrin to HDACi molar ratio of ⁇ 1.5-1.9, that corresponds to a cyclodextrin concentration of ⁇ 15-19 mM.
  • HDACi An example of a preferred HDACi is PXD-101, which has a molecular weight of ⁇ 318 g/mol.
  • ⁇ -cyclodextrin has a molecular weight of ⁇ 1135 g/mol.
  • the cyclodextrin to HDACi molecular weight ratio is ⁇ 1135/318 or ⁇ 3.57. If the composition (e.g, pre-formulation, formulation) is to have a cyclodextrin to HDACi molar ratio of -1.5-1.9, that corresponds to a cyclodextrin to HDACi weight ratio of ⁇ 5.3-6.8 (i.e., 5.3-6.8 grams of ⁇ -cyclodextrin for each gram of PXD-101).
  • a total cyclodextrin dose of less than 5000, 2000, 1000, 500, 400, 300, 200, 100, or 50 mg/kg.
  • the molar ratio of arginine to HDACi is at least 0.5, 0.7, 0.8, 0.9, 1.0, 1.1, 1.2, 1.3, 1.4, or 1.5.
  • the molar ratio of arginine to HDACi is up to and including 5, 4, 3.5, 3, 2.5, 2.0, 1.9, 1.8, 1.7, 1.6, or 1.5.
  • the molar ratio is 0.5-5. In one embodiment, the molar ratio is 0.8-4.
  • the molar ratio is 1-3.
  • the molar ratio is 1.2-2.5.
  • the molar ratio is 1.4-2.
  • the molar ratio is 1.5-1.9
  • composition e.g., formulation
  • composition e.g., formulation
  • arginine to HDACi molar ratio ⁇ 1.5-1.9, that corresponds to an arginine concentration of ⁇ 15-19 mM.
  • HDACi An example of a preferred HDACi is PXD-101 , which has a molecular weight of
  • Free arginine has a molecular weight of ⁇ 174 g/mol.
  • the arginine to HDACi molecular weight ratio is ⁇ 174/318 or ⁇ 0.547. If the composition (e.g., pre-formulation, formulation) is to have an arginine to HDACi molar ratio of ⁇ 1.5-1.9, that corresponds to an arginine to HDACi weight ratio of ⁇ 0.82-1.04 (i.e., 0.82-1.04 grams of arginine for each gram of PXD-101). It may be preferred to ensure a total arginine dose of less than 200, 100, 50, 30, or 20 g/kg.
  • the molar ratio of meglumine to HDACi is at least 0.5, 0.7, 0.8, 0.9, 1.0, 1.1 , 1.2, 1.3, 1.4, or 1.5.
  • the molar ratio of meglumine to HDACi is up to and including 5, 4, 3.5, 3, 2.5, 2.0, 1.9, 1.8, 1.7, 1.6, or 1.5.
  • the molar ratio is 0.5-5. In one embodiment, the molar ratio is 0.8-4. In one embodiment, the molar ratio is 1-3. In one embodiment, the molar ratio is 1.2-2.5. In one embodiment, the molar ratio is 1.4-2. In one embodiment, the molar ratio is 1.5-1.9
  • compositions e.g., formulation
  • An example of a preferred HDACi concentration for a composition is ⁇ 10 mM. If that composition (e.g., formulation) is to have a meglumine to HDACi molar ratio of ⁇ 1.5-1.9, that corresponds to a meglumine concentration of ⁇ 15-19 mM.
  • HDACi An example of a preferred HDACi is PXD-101 , which has a molecular weight of ⁇ 318 g/mol. Free meglumine has a molecular weight of ⁇ 195 g/mol. The meglumine to HDACi molecular weight ratio is ⁇ 195/318 or ⁇ 0.613. If the composition
  • pre-formulation, formulation is to have a meglumine to HDACi molar ratio of ⁇ 1.5-1.9, that corresponds to a meglumine to HDACi weight ratio of -0.92-1.17 (i.e., 0.92-1.17 grams of meglumine for each gram of PXD-101).
  • compositions may be prepared using conventional methods that are well known in the field of pharmacy. For example, methods that use standard laboratory or pharmaceutical processing equipment are well known to those in the field of pharmacy.
  • One aspect of the present invention pertains to a method of preparing a composition (e.g., pre-formulation, formulation) (as described herein) by combining: (a) a HDACi as defined herein, and (b) one or more of the following additional ingredients: cyclodextrin, arginine, and meglumine; and optionally one or more other additional pharmaceutically acceptable ingredients (as described herein).
  • a composition e.g., pre-formulation, formulation
  • an appropriate amount of pure, dry HDACi (e.g., PXD-101) may be dissolved in a solution of salt former (e.g., arginine, meglumine) or cyclodextrin in water at a suitable concentration as described herein. Solubilisation may be achieved over a period of from about 1 minute to about 1 hour by stirring, for example, using a magnetic stirrer, paddle stirrer, or turbine mixer, with or without the application of heat. The resulting solution is then diluted to the final volume, e.g., with the appropriate grade of water, and stirred for a further period of time until the solution is homogenous.
  • salt former e.g., arginine, meglumine
  • cyclodextrin cyclodextrin in water at a suitable concentration as described herein. Solubilisation may be achieved over a period of from about 1 minute to about 1 hour by stirring, for example, using a magnetic stirrer, paddle stirrer, or turbine mixer, with or without
  • the pH of the solution can be adjusted using a suitable acid (e.g., HCI) to achieve a pH of greater than or equal to about 8.5.
  • a suitable acid e.g., HCI
  • the solution is passed through a suitable filter (e.g., sterilising grade 0.2 ⁇ m filter) and placed in appropriate containers (e.g., vials, ampoules, etc.) in a suitable pharmaceutical manufacturing environment, and sealed/capped.
  • a suitable filter e.g., sterilising grade 0.2 ⁇ m filter
  • appropriate containers e.g., vials, ampoules, etc.
  • a lyophilisate is prepared by placing the solution in vials fitted with a suitable lyophilisation stopper and removing the water by freeze-drying to provide a powder suitable for reconstitution/re-hydration using a suitable re-hydration medium (e.g., saline, glucose, etc.). After freeze-drying, the vials are sealed and capped.
  • a suitable re-hydration medium e.g., saline, glucose, etc.
  • One aspect of the present invention pertains to a method of preparing a formulation (as described herein) by diluting, reconstituting, hydrating, re-hydrating, etc. a pre-formulation (as described herein).
  • One aspect of the present invention pertains to a pharmaceutical composition (e.g., formulation) (as described herein) obtained by diluting, reconstituting, hydrating, re-hydrating, etc. a pre-formulation (as described herein).
  • a pharmaceutical composition e.g., formulation
  • a pre-formulation obtained by diluting, reconstituting, hydrating, re-hydrating, etc.
  • compositions e.g., formulation
  • a pharmaceutical composition e.g., formulation
  • a pre-formulation obtainable by diluting, reconstituting, hydrating, re-hydrating, etc. a pre-formulation (as described herein).
  • formulations may be prepared from pre-formulations, for example, extemporaneously, by dilution, reconstitution, hydration, re-hydration, etc., using appropriate liquids, e.g., water (e.g., water-for-injection), aqueous saline (e.g., 0.9% w/v saline solution), aqueous glucose (e.g., 5% w/v glucose solution), etc.
  • an appropriate amount of liquid concentrated composition e.g., pre-formulation
  • pre-formulation initially provided in a vial or ampoule
  • the resulting formulation used for administration by intravenous infusion.
  • a lyophilate/lyophilisate composition for example, an appropriate amount of a lyophilate/lyophilisate composition
  • pre-formulation may be reconstituted (or re-hydrated) by adding a suitable aqueous medium (e.g., water for injection, 0.9% saline solution, 5% glucose solution, etc.), e.g., to the vial containing the lyophilate/lyophilisate, e.g., using a suitable syringe and needle.
  • a suitable aqueous medium e.g., water for injection, 0.9% saline solution, 5% glucose solution, etc.
  • the contents of the vial may then be shaken to dissolve the lyophilised powder.
  • the resulting composition may then be used as a formulaton, and administered to the subject, or may be used as a pre-formulation, and diluted to the required concentration, e.g., by addition to a suitable infusion medium, e.g., in an infusion bag.
  • One aspect of the present invention pertains to a method of formulating a HDACi (as described herein) comprising the step of: combining said HDACi with one or more of the following additional ingredients: cyclodextrin, arginine, and meglumine (as described herein); and optionally one or more other additional pharmaceutically acceptable ingredients (as described herein).
  • One aspect of the present invention pertains to a method of increasing the concentration of a HDACi (as described herein) in a pharmaceutical composition, comprising the step of: formulating said HDACi with one or more of the following additional ingredients: cyclodextrin, arginine, and meglumine (as described herein); and optionally one or more other additional pharmaceutically acceptable ingredients (as described herein).
  • One aspect of the present invention pertains to a pharmaceutical composition
  • a pharmaceutical composition comprising an HDAC inhibitor (e.g., PXD-101) in solid dosage form (e.g., tablet, capsule, gelatin tablet, etc.) (e.g., a gelatine capsule).
  • an HDAC inhibitor e.g., PXD-101
  • solid dosage form e.g., tablet, capsule, gelatin tablet, etc.
  • solid dosage form e.g., tablet, capsule, gelatin tablet, etc.
  • One aspect of the present invention pertains to a solid dosage form (e.g., tablet, capsule, gelatin tablet, etc.) (e.g., a gelatine capsule) containing an HDAC inhibitor, as described herein.
  • a solid dosage form e.g., tablet, capsule, gelatin tablet, etc.
  • a gelatine capsule e.g., a gelatine capsule
  • One aspect of the present invention pertains to a solid dosage form (e.g., tablet, capsule, gelatin tablet, etc.) (e.g., a gelatine capsule) containing a pharmaceutical composition (e.g., formulation), as described herein. Medical Use, Methods of Treatment, Etc.
  • a solid dosage form e.g., tablet, capsule, gelatin tablet, etc.
  • a pharmaceutical composition e.g., formulation
  • composition components as described herein e.g., a HDACi; one or more of cyclodextrin, arginine, and meglumine; etc.
  • One aspect of the present invention pertains to a pharmaceutical composition (e.g., pre-formulation, formulation), as described herein, for use in a method of treatment of the human or animal body by therapy.
  • a pharmaceutical composition e.g., pre-formulation, formulation
  • One aspect of the present invention pertains to use of the pharmaceutical composition components as described herein (e.g., a HDACi; one or more of cyclodextrin, arginine, and meglumine; etc.) in the manufacture of a medicament for the treatment of a condition, as described herein.
  • a pharmaceutical composition component e.g., a HDACi; one or more of cyclodextrin, arginine, and meglumine; etc.
  • One aspect of the present invention pertains to use of a pharmaceutical composition (e.g., pre-formulation), as described herein, in the manufacture of a medicament for the treatment of a condition, as described herein.
  • a pharmaceutical composition e.g., pre-formulation
  • One aspect of the present invention pertains to a method of treatment, comprising administering to a subject in need of treatment a pharmaceutical composition (e.g., formulation), as described herein.
  • a pharmaceutical composition e.g., formulation
  • One aspect of the present invention pertains to a method of (a) regulating (e.g., inhibiting) cell proliferation; (b) inhibiting cell cycle progression; (c) promoting apoptosis; or (d) a combination of one or more of these, in vitro or in vivo, comprising contacting a cell with a pharmaceutical composition (e.g., formulation) as described herein.
  • a pharmaceutical composition e.g., formulation
  • Any type of cell may be treated, including but not limited to, lung, gastrointestinal
  • One aspect of the present invention pertains to a method of administering a HDACi, as defined herein, to a subject, comprising administering to said subject a pharmaceutical composition (e.g., formulation), as described herein.
  • a pharmaceutical composition e.g., formulation
  • treatment refers generally to treatment and therapy, whether of a human or an animal (e.g., in veterinary applications), in which some desired therapeutic effect is achieved, for example, the inhibition of the progress of the condition, and includes a reduction in the rate of progress, a halt in the rate of progress, amelioration of the condition, and cure of the condition.
  • Treatment as a prophylactic measure i.e., prophylaxis
  • use with subjects who have not yet developed the condition, but who are at risk of developing the condition is encompassed by the term "treatment.”
  • therapeutic ly-effective amount refers to that amount of HDACi that is effective for producing some desired therapeutic effect, commensurate with a reasonable benefit/risk ratio, when administered in accordance with a desired treatment regimen.
  • treatment includes combination treatments and therapies, in which two or more treatments or therapies are combined, for example, sequentially or simultaneously.
  • the compounds described herein may also be used in combination therapies, e.g., in conjunction with other agents, for example, cytotoxic agents, etc.
  • treatments and therapies include, but are not limited to, chemotherapy (the administration of active agents, including, e.g., HDACis, antibodies (e.g., as in immunotherapy), prodrugs (e.g., as in photodynamic therapy, GDEPT, ADEPT, etc.); surgery; radiation therapy; and gene therapy.
  • the treatment is treatment of a proliferative condition.
  • proliferative condition refers to an unwanted or uncontrolled cellular proliferation of excessive or abnormal cells that is undesired, such as, neoplastic or hyperplastic growth.
  • the treatment is treatment of a proliferative condition characterised by benign, pre-malignant, or malignant cellular proliferation, including but not limited to, neoplasms, hyperplasias, and tumours (e.g., histocytoma, glioma, astrocyoma, osteoma), cancers (see below), psoriasis, bone diseases, fibroproliferative disorders (e.g., of connective tissues), pulmonary fibrosis, atherosclerosis, smooth muscle cell proliferation in the blood vessels, such as stenosis or restenosis following angioplasty.
  • a proliferative condition characterised by benign, pre-malignant, or malignant cellular proliferation
  • neoplasms e.g., hyperplasias, and tumours (e.g., histocytoma, glioma, astrocyoma, osteoma), cancers (see below), psoriasis, bone diseases, fibroprolifer
  • the treatment is treatment of cancer.
  • the treatment is treatment of lung cancer, small cell lung cancer, gastrointestinal cancer, bowel cancer, colon cancer, rectal cancer, colorectal cancer, breast cancer, ovarian cancer, prostate cancer, testicular cancer, liver cancer, kidney cancer, bladder cancer, pancreas cancer, brain cancer, sarcoma, osteosarcoma, Kaposi's sarcoma, melanoma, malignant melanoma, basa! cell carcinoma, or leukemia.
  • the treatment is treatment of a condition mediated by HDAC.
  • a condition mediated by HDAC refers to a condition in which HDAC and/or the action of HDAC is important or necessary, e.g., for the onset, progress, expression, etc. of that condition, or a condition that is known to be treated by HDAC inhibitors (such as, e.g., trichostatin A).
  • HDAC inhibitors such as, e.g., trichostatin A.
  • Psoriasis see, e.g., lavarone et al., 1999, MoI. Cell Biol.. Vol. 19, No. 1 , pp. 916-922).
  • Fibroproliferative disorders e.g., liver fibrosis
  • Fibroproliferative disorders e.g., liver fibrosis
  • Niki et al. 1999, Hepatoloqy, Vol. 29, No. 3, pp. 858-867; Corneil et al., 1998, published Japanese patent application, publication number JP 10114681 A2
  • Neurodegenerative diseases e.g., Alzheimer's, Parkinson's, Huntington's chorea, amyotropic lateral sclerosis, spino-cerebellar degeneration
  • Neurodegenerative diseases e.g., Alzheimer's, Parkinson's, Huntington's chorea, amyotropic lateral sclerosis, spino-cerebellar degeneration
  • Inflammatory diseases e.g., osteoarthritis, rheumatoid arthritis
  • Inflammatory diseases e.g., Dangond et al., 1998, Biochem. Biophvs. Res. Commun., Vol. 242, No. 3, pp. 648-652; Takahashi, I., et al, 1996, J. Antibiot. (Tokyo). Vol. 49, No. 5, pp. 453-457).
  • angiogenesis e.g., cancer, rheumatoid arthritis, psoriasis, diabetic retinopathy
  • Haematopoietic disorders e.g., anaemia, sickle cell anaemia, thalassaeimia
  • Parasitic infections e.g., malaria, trypanosomiasis, helminthiasis, protozoal infections (see, e.g., Andrews et al., 2000, Int. J. Parasito!.. Vol. 30, No. 6, pp. 761-768).
  • Conditions treatable by immune modulation e.g., multiple sclerosis, autoimmune diabetes, lupus, atopic dermatitis, allergies, asthma, allergic rhinitis, inflammatory bowel disease; and for improving grafting of transplants
  • immune modulation e.g., multiple sclerosis, autoimmune diabetes, lupus, atopic dermatitis, allergies, asthma, allergic rhinitis, inflammatory bowel disease; and for improving grafting of transplants
  • immune modulation e.g., multiple sclerosis, autoimmune diabetes, lupus, atopic dermatitis, allergies, asthma, allergic rhinitis, inflammatory bowel disease; and for improving grafting of transplants
  • Administration can be effected in one dose, continuously or intermittently (e.g., in divided doses at appropriate intervals) throughout the course of treatment. Methods of determining the most effective means and dosage of administration are well known to those of skill in the art and will vary with the particular formulation used for therapy, the purpose of the therapy, the target cell(s) being treated, and the subject being treated. Single or multiple administrations can be carried out with the dose level and pattern being selected by the treating physician, clinician, or veterinarian.
  • the subject would receive the HDAC inhibitor intravenously or subcutaneously in quantities sufficient to deliver between about 3-1500 mg/m 2 per day, for example, about 3, 30, 60, 90, 180, 300, 600, 900, 1000, 1200, or 1500 mg/m 2 per day.
  • Such quantities can be administered in a number of suitable ways, e.g., large volumes of low concentrations of HDAC inhibitor during one extended period of time or several times a day.
  • the quantities can be administered for one or more consecutive days, alternate days, intermittent days, or a combination thereof per week (7 day period).
  • low volumes of high concentrations of HDAC inhibitor during a short period of time e.g., once a day for one or more days either consecutively, alternately, intermittently or a combination thereof per week (7 day period).
  • a dose of 300 mg/m 2 per day can be administered for 5 consecutive days for a total of 1500 mg/m 2 per treatment.
  • the number of consecutive days can also be 5, with treatment lasting for 2 or 3 consecutive weeks for a total of 3000 mg/m 2 and 4500 mg/m 2 total treatment.
  • an intravenous formulation can be prepared which contains a concentration of HDAC inhibitor of from about 1.0 mg/mL to about 10 mg/mL, e.g., 1.0 mg/mL, 2.0 mg/mL, 3.0 mg/mL, 4.0 mg/mL, 5.0 mg/mL, 6.0 mg/mL, 7.0 mg/mL, 8.0 mg/mL, 9.0 mg/mL and 10 mg/mL, and administered in amounts to achieve the doses described above.
  • a sufficient volume of intravenous formulation can be administered to a subject in a day such that the total dose for the day is between about 300 and about 1200 mg/m 2 .
  • 900 mg/m 2 of PXD-101 is administered intravenously every 24 hours for at least five consecutive days. In another specific embodiment, 100 mg/m 2 of PXD-101 is administered intravenously every 24 hours for at least five consecutive days
  • oral dosages of HDAC inhibitors when used to treat the desired condition, can range from about 2 mg to about 2000 mg per day, such as from about 20 mg to about 2000 mg per day, such as from about 200 mg to about 2000 mg per day.
  • oral dosages can be about 2, about 20, about 200, about 400, about 800, about 1200, about 1600 or about 2000 mg per day. It is understood that the total amount per day can be administered in a single dose or can be administered in multiple dosing such as twice, three, or four times per day.
  • a subject can receive from about 2 mg/day to about 2000 mg/day, for example, from about 20 mg/day to about 2000 mg/day, such as from about 200 mg/day to about 2000 mg/day, for example from about 400 mg/day to about 1200 mg/day.
  • a suitably prepared medicament for once a day administration can thus contain from about 2 mg to about 2000 mg, such as from about 20 mg to about 2000 mg, such as from about 200 mg to about 1200 mg, such as from about 400 mg/day to about 1200 mg/day.
  • the HDAC inhibitors can be administered in a single dose or in divided doses of two, three, or four times daily. For administration twice a day, a suitably prepared medicament would therefore contain half of the needed daily dose.
  • kit or kit-of-parts
  • a pharmaceutical composition e.g., pre-formulation, formulation
  • suitable container preferably provided in a suitable container and/or with suitable packaging
  • instructions for use for example, written instructions on how to administer the composition, etc.
  • kit or kit-of-parts
  • a pharmaceutical composition e.g., pre-formulation
  • suitable container preferably provided in a suitable container and/or with suitable packaging
  • instructions for use for example, written instructions on how to prepare a suitable pharmaceutical formulation from the composition (e.g., pre-formulation), and how to subsequently administer the formulation, etc.
  • the kit may include additional parts, including, for example, appropriate solutions for dilution (e.g., physiological saline solution, glucose solution, etc.), reagents (e.g., for adjusting pH), and devices (e.g., bags, tubes, syringes, needles, transfer sets) for assembly and use (e.g., in the preparation of formulations and subsequent administration).
  • appropriate solutions for dilution e.g., physiological saline solution, glucose solution, etc.
  • reagents e.g., for adjusting pH
  • devices e.g., bags, tubes, syringes, needles, transfer sets
  • the written instructions may also include a list of indications for which the formulation (e.g., the HDACi therein) is a suitable treatment.
  • compositions are stable and can be diluted to the desired target concentration without the risk of precipitation. Furthermore, the compositions have a pH that, while higher than ideal, is acceptable for use.
  • the ultraviolet (UV absorbance E ⁇ value for PXD-101 was determined by plotting a calibration curve of PXD-101 concentration in 50:50 methanol/water at the ⁇ max for the material, 269 nm. Using this method, the E 1 i value was determined as 715.7.
  • Methanol/water was selected as the subsequent diluting medium for solubility studies rather than neat methanol (or other organic solvent) to reduce the risk of precipitation of the cyclodextrin.
  • phase solubility diagram for HP- ⁇ -CD was prepared for concentrations of cyclodextrin between 50 and 500 mg/mL (5-50% w/v).
  • the calculated saturated solubilities of the complexed HDACi were plotted against the concentration of cyclodextrin. See Figure 1.
  • the plot shows that there is an approximately linear relationship between cyclodextrin and HDACi concentration with a molar ratio of about 4:1.
  • This type of phase solubility diagram for cyclodextrins is referred to as an A-Type phase solubility plot.
  • the plot shows a slight positive deviation in the ratio of HDACi to cyclodextrin. This deviation may be due to experimental error caused by the decision to use of mass, instead of volume, to dispense the more concentrated cyclodextrin samples due to their viscosity. Alternatively, it is possible that there is a slight deviation from the linear A-Type phase solubility behaviour.
  • the pH solubility profile for 25% w/v HP- ⁇ -CD was prepared using a variety of buffer systems as defined in Buffers for pH and Metal Ion Control, D. Perrin & B. Dempsey, Chapman & Hall, New York, 1983. Since cyclodextrin might complex with the buffering agents, appropriate selection of buffer systems was important: succinic acid/NaOH buffer was selected for pH 4; phosphate buffer was selected for the pH range 6-8; and glycine/NaOH buffer was selected for the pH range 8-9.
  • Acidic in situ salt formers proved to be ineffective in improving the solubility of PXD-101.
  • the data are summarised in the following table.
  • the decrease in calculated solubility for ascorbic acid suggests a chemical interaction or a salting out effect.
  • Salt concentration equivalent to 0.16 M. 2 "S/D" molar ratio is "salt former-to-HDACi” ratio.
  • Phase solubility diagrams for both arginine and meglumine were prepared using three further concentrations of these salt formers (x 0.5, x 2, and x 3 the 0.16 M concentration used in the previous study), as set out in the following table.
  • phase solubility diagrams are shown in Figure 3.
  • the plot shows that there is a linear relationship between solubility of HDACi and salt former concentration for both arginine and meglumine.
  • the 0.47 M arginine and 0.47 M meglumine saturated HDACi solutions were diluted with 5% w/v glucose and 0.9% w/v saline to give a target infusion concentration of 3.5 mg/mL of HDACi. These samples were successfully diluted and physically stable for more than 24 hours. The final pH of the diluted samples are summarised in the following table.
  • the pH of the systems containing arginine or meglumine is approximately 9.
  • the HDACi e.g., PXD-101
  • PXD-101 is chemically unstable at a pH above 8.5. Therefore, attempts were made to lower the pH of the saturated systems using 2 N HCI, in an effort to improve the chemical stability of the HDACi.
  • the solution was filtered through a suitable 0.2 ⁇ m sterilising (e.g. PVDF) membrane.
  • a suitable 0.2 ⁇ m sterilising (e.g. PVDF) membrane was placed in vials or ampoules, which were sealed by heat, or with a suitable stopper and cap.
  • the solutions were stored at ambient temperature, or, more preferably, under refrigeration (e.g., 2-8°C) in order to reduced degradation of the HDACi.
  • PXD101 is a low molecular weight histone deacetylase (HDAC) inhibitor with a sulfonamide-hydroxamide structure. HDAC inhibitors modulate transcriptional activity of genes important for tumor growth and survival.
  • PXD101 has potent antiproliferative activity against cell lines from multiple cancer types in vitro, and demonstrates antineoplastic activity in animal tumor models. PXD101 reduces tumor volume of human xenografts.
  • PXD101 has synergistic and additive anti-tumor activity in vitro and in vivo, in combination with many established anticancer therapeutics. Objectives
  • DLT dose-limiting toxicity
  • MTD maximum tolerated dose
  • PXD-101 was administered as a 30-minute intravenous infusion on days 1 to 5 every 3 weeks to subjects with advanced cancer. Sequential dose cohorts of 3-6 subjects were examined (150, 300, 600, 900, and 1200 mg/m 2 ), followed by examination of an expanded cohort at 1000 mg/m 2 for I.V. and oral testing. The treatment doses and cycles are summarized in the following table.
  • Plasma PK analysis was performed for subjects of all dose groups on days 1 and 5 of cycle 1 following 30 minutes of I.V. infusion. The PK analysis is summarized in the following table.
  • Pharmacokinetic analysis shows dose proportional plasma levels and AUC, with an elimination half-life of 47-86 minutes. (See Figure 6, Figure 7, Figure 8). There was no HDACi accumulation on repated dosing.
  • PXD-101 was generally well-tolerated at doses up to 1000 mg/m 2 .
  • HDACi-related adverse events were fatigue, nausea, vomiting (infusion-related), and phlebitis. Nausea and vomiting frequently required anti-emetic therapy. Other adverse events included headache, diarrhoea, constipation, and dyspnoea. No specific abnormalities were detected in laboratory tests. In particular, no hematological toxicity was identified. At least one subject experienced Grade 3 fatigue at 600 mg/m 2 . Atrial fibrillation, which was spontaneously reversible, occurred at 1200 mg/m 2 . Grade 3 diarrhoea and lethargy prevented completion of a cycle at 1200 mg/m 2 .
  • Peripheral blood mononuclear cells were collected pre-therapy, immediately post- infusion, and between 2-24 hours after intravenous administration of PXD-101 to assess the effect of PXD-101 on the extent of histone acetylation in a normal host cell.
  • Histones were isolated and probed with anti-acetylated histone (H4 and/or H3) antibody followed by HRP-secondary antibody.
  • H4 and/or H3 antibody anti-acetylated histone
  • HRP-secondary antibody anti-acetylated histone
  • Preliminary analysis demonstrated an increase in the accumulation of acetylated histones in peripheral mononuclear cells that could be detected up to 24 hours after intravenous administration of PXD-101. See Figure 9 and Figure 10. Dose proportional H4 acetylation was observed, with a more sustained effect at higher doses.
  • Figure 11 is a Western Blot showing expression of these proteins taken from lymphocytes prepared from a subject during cycles 2 and 4 of PXD-101 treatment at 900 mg/m 2 .
  • FIG. 12 is a graph comparing plasma levels following oral and intravenous administration of PXD-101. The plasma levels remain higher when dosed orally.

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IL224229A IL224229A (en) 2005-05-13 2013-01-15 A pharmacist's drug containing histone de-acetyl inhibitor and megalumin and its use to create a drug
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CA2606598A1 (en) 2006-11-16
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