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Allan E.K.,University of Glasgow | Allan E.K.,Gartnavel General Hospital | Holyoake T.L.,University of Glasgow | Craig A.R.,ChemGenex Pharmaceuticals | Jorgensen H.G.,University of Glasgow
Leukemia | Year: 2011

Chronic myeloid leukaemia (CML) is maintained by a rare population of tyrosine kinase inhibitor (TKI)-insensitive malignant stem cells. Our long-term aim is to find a BcrAbl-independent drug that can be combined with a TKI to improve overall disease response in chronic-phase CML. Omacetaxine mepesuccinate, a first in class cetaxine, has been evaluated by clinical trials in TKI-insensitive/resistant CML. Omacetaxine inhibits synthesis of anti-apoptotic proteins of the Bcl-2 family, including (myeloid cell leukaemia) Mcl-1, leading to cell death. Omacetaxine effectively induced apoptosis in primary CML stem cells (CD34 38 lo) by downregulation of Mcl-1 protein. In contrast to our previous findings with TKIs, omacetaxine did not accumulate undivided cells in vitro. Furthermore, the functionality of surviving stem cells following omacetaxine exposure was significantly reduced in a dose-dependant manner, as determined by colony forming cell and the more stringent long-term culture initiating cell colony assays. This stem cell-directed activity was not limited to CML stem cells as both normal and non-CML CD34 cells were sensitive to inhibition. Thus, although omacetaxine is not leukaemia stem cell specific, its ability to induce apoptosis of leukaemic stem cells distinguishes it from TKIs and creates the potential for a curative strategy for persistent disease. © 2011 Macmillan Publishers Limited All rights reserved.


Patent
ChemGenex Pharmaceuticals | Date: 2015-12-23

The present disclosure provides oral dosage forms comprising a cephalotaxine and a pharmaceutically acceptable carrier selected from protein, carbohydrate and lipid, an oral dosage form comprising cephalotaxine and a second active agent, as well as methods of treating subjects with such oral formulations.


Patent
ChemGenex Pharmaceuticals | Date: 2014-12-18

A method for treating a leukemia patient that is resistant to a thymidine kinase inhibitor (TKI) other than imantinib comprising administering a cephalotaxine to said patient until said patient demonstrates a hematological or cytological response to said leukemia.


The present invention concerns a method of treating chronic myelogenous leukemia, a related myeloproliferative disorder or a Ph-positive acute lymphocytic leukemia in a subject animal, comprising:(a) selecting or identifying an animal suffering from chronic myelogenous leukemia or a related myeloproliferative disorder and showing resistance or intolerance to treatment with STI571; and(b) administering to the animal homoharringtonine. In a preferred embodiment, the animal is a human being.


Patent
ChemGenex Pharmaceuticals | Date: 2010-03-09

The present invention provides methods for dosing patients with naphthalimides, including amonafide, amonafide salts, and analogs thereof based on N-acetyl transferase genotyping. The invention also provides methods for dosing the amount of granulocyte colony stimulating factor (GCSF) used in combination with naphthalimide to prevent or modulate leukocytopenia.


Patent
ChemGenex Pharmaceuticals | Date: 2011-08-11

The present disclosure provides oral dosage forms comprising a cephalotaxine and a pharmaceutically acceptable carrier selected from protein, carbohydrate and lipid, an oral dosage form comprising cephalotaxine and a second active agent, as well as methods of treating subjects with such oral formulations.


Patent
ChemGenex Pharmaceuticals | Date: 2010-04-15

A method of treatment of a host with a cellular proliferative disease, comprising contacting the host with a cephalotaxine and an antiproliferative agent, each in an amount sufficient to modulate said cellular proliferative disease, is described. In some embodiments, the cephalotaxine comprises homoharringtonine (cephalotaxine, 4-methyl-2-hydroxy-2-(4-hydroxy-4-methyl pentyl)butanediocate ester). Antiproliferative agents of the invention comprise alkylating agents, intercalating agents, metal coordination complexes, pyrimidine nucleosides, purine nucleosides, inhibitors of nucleic acid associated enzymes and proteins, and agents affecting structural proteins and cytoplasmic enzymes.


Patent
ChemGenex Pharmaceuticals | Date: 2011-12-23

A method of treatment of a host with a cellular proliferative disease, comprising contacting the host with a cephalotaxine and an antiproliferative agent, each in an amount sufficient to modulate said cellular proliferative disease, is described. In some embodiments, the cephalotaxine comprises homoharringtonine (cephalotaxine, 4-methyl-2-hydroxy-2-(4-hydroxy-4-methyl pentyl)butanediocate ester). Antiproliferative agents of the invention comprise alkylating agents, intercalating agents, metal coordination complexes, pyrimidine nucleosides, purine nucleosides, inhibitors of nucleic acid associated enzymes and proteins, and agents affecting structural proteins and cytoplasmic enzymes.


Patent
ChemGenex Pharmaceuticals | Date: 2011-07-05

The present invention provides methods for dosing patients with naphthalimides, including amonafide, amonafide salts, and analogs thereof based on N-acetyl transferase genotyping. The invention also provides methods for dosing the amount of granulocyte colony stimulating factor (GCSF) used in combination with naphthalimide to prevent or modulate leukocytopenia.


Patent
ChemGenex Pharmaceuticals | Date: 2011-04-06

The present invention concerns novel methods for the synthesis of napthalimides and mitonafide analogs, as well as salts thereof. Also included are novel compositions, including napthalimides and napthalimide salts, analogs thereof, as well as stable liquid dosage forms thereof.

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