WO2018172419A1 - Biomarqueurs destiné à la prédiction de la sensibilité à une thérapie d'activation de pp2a dans le cancer - Google Patents
Biomarqueurs destiné à la prédiction de la sensibilité à une thérapie d'activation de pp2a dans le cancer Download PDFInfo
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- WO2018172419A1 WO2018172419A1 PCT/EP2018/057189 EP2018057189W WO2018172419A1 WO 2018172419 A1 WO2018172419 A1 WO 2018172419A1 EP 2018057189 W EP2018057189 W EP 2018057189W WO 2018172419 A1 WO2018172419 A1 WO 2018172419A1
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- cancer
- aurka
- kif2c
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- pp2a
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Classifications
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
- A61P35/00—Antineoplastic agents
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
- A61K31/00—Medicinal preparations containing organic active ingredients
- A61K31/13—Amines
- A61K31/135—Amines having aromatic rings, e.g. ketamine, nortriptyline
- A61K31/137—Arylalkylamines, e.g. amphetamine, epinephrine, salbutamol, ephedrine or methadone
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/48—Biological material, e.g. blood, urine; Haemocytometers
- G01N33/50—Chemical analysis of biological material, e.g. blood, urine; Testing involving biospecific ligand binding methods; Immunological testing
- G01N33/5005—Chemical analysis of biological material, e.g. blood, urine; Testing involving biospecific ligand binding methods; Immunological testing involving human or animal cells
- G01N33/5008—Chemical analysis of biological material, e.g. blood, urine; Testing involving biospecific ligand binding methods; Immunological testing involving human or animal cells for testing or evaluating the effect of chemical or biological compounds, e.g. drugs, cosmetics
- G01N33/5011—Chemical analysis of biological material, e.g. blood, urine; Testing involving biospecific ligand binding methods; Immunological testing involving human or animal cells for testing or evaluating the effect of chemical or biological compounds, e.g. drugs, cosmetics for testing antineoplastic activity
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/48—Biological material, e.g. blood, urine; Haemocytometers
- G01N33/50—Chemical analysis of biological material, e.g. blood, urine; Testing involving biospecific ligand binding methods; Immunological testing
- G01N33/5005—Chemical analysis of biological material, e.g. blood, urine; Testing involving biospecific ligand binding methods; Immunological testing involving human or animal cells
- G01N33/5091—Chemical analysis of biological material, e.g. blood, urine; Testing involving biospecific ligand binding methods; Immunological testing involving human or animal cells for testing the pathological state of an organism
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
- A61K38/00—Medicinal preparations containing peptides
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
- A61K39/00—Medicinal preparations containing antigens or antibodies
Definitions
- the invention relates to the treatment and classification of cancer, in particular breast cancer. It relates to identifying patients who are likely to respond to
- the deregulation of the protein phosphatase 2A (PP2A) complex is known to be a common event in cancer (Grech et al; Tumor Biol; DOl 10.1007/s 13277-016-5145-4 (2016)).
- the inventors have shown that cancer cells sensitive to treatment with
- a PP2A activator exhibit overexpression of the markers AURKA and KIF2C.
- These include cancer cells exemplified by Triple negative breast cancer (TNBC) cells that do not benefit from targeted therapy and have bad prognosis when current front-line
- anti-cancer therapies are administered.
- the markers further correlate with low PP2A enzymatic activity.
- the markers may thus be used to predict responsiveness of a patient to treatment with a PP2A activator.
- AURKA and KIF2C may also be targeted with antagonists to thereby treat cancer, based on their correlation with cancer.
- markers may thus be assayed using suitable reagents in kits for
- the invention therefore provides a method of treating a patient having a cancer comprising an overexpression of AURKA and/or KIF2C, comprising administering to the patient a PP2A activator and thereby treating the cancer.
- the invention additionally provides a method of treating cancer in a patient, the method comprising (a) measuring the amount of AURKA and/or KIF2C in the cancer and (b) if the cancer comprises an overexpression of AURKA and/or KIF2C, administering to the patient a PP2A activator and thereby treating the cancer.
- the invention also provides a PP2A activator for use in treating cancer in a patient, wherein the cancer comprises an overexpression of AURKA and/or KIF2C, and use of a PP2A activator in the manufacture of a medicament for treating cancer in a patient, wherein the cancer comprises an overexpression of AURKA and/or KIF2C.
- the invention also provides a method for determining whether or not a patient having or suspected of having or being at risk of developing cancer will respond to treatment with a PP2A activator, which method comprises measuring expression of AURKA and/or KIF2C in the individual, and thereby predicting whether or not the patient will respond to treatment with a PP2A activator.
- the invention further provides a method for classifying a cancer in a patient, the method comprising measuring expression of AURKA and/or KIF2C in the patient, and classifying the cancer as of a particular subtype based on the expression.
- the invention also provides a kit for detecting a cancer comprising a deregulation of PP2A, comprising reagents suitable for detecting expression of AURKA and/or KIF2C.
- the invention also provides a system for classifying cancer in a patient, or for predicting responsiveness of a cancer patient to treatment with a PP2A activator, the system comprising: (a) a measuring module for determining expression of AURKA and/or KIF2C in the patient, (b) a storage module configured to store control data and output data from the measuring module, (c) a computation module configured to provide a comparison between the value of the output data from the measuring module and the control data; and (d) an output module configured to display whether or not the patient has cancer based on the comparison, wherein an overexpression of AURKA and/or KIF2C in the patient classifies the cancer or predicts that the patient will respond to treatment with a PP2A activator.
- a measuring module for determining expression of AURKA and/or KIF2C in the patient
- a storage module configured to store control data and output data from the measuring module
- a computation module configured to provide a comparison between the value of the output data from the measuring module and the control data
- Figure 1 shows MTT assays for cell viability of various breast cancer cell lines at increasing concentrations of FTY720 ranging from 0 (untreated) to 5 ⁇ . Cells were left to adhere for 24 hours following seeding, then treated for 48 hours in duplicate experiments. The cell viability of the cell lines at each dose is expressed as a percentage of the untreated cells. Error bars are expressed as percentages of the untreated cell viability and represent the standard deviation from triplicate assay values for biological replicates.
- TNBC basal and triple negative breast cancer
- FIG. 1 Distribution of gene expression levels derived from quantigene assay intensity data, normalised to housekeeping genes, comparing sensitive versus non sensitive cell lines. RN A expression was measured by Quantigene and normalised to housekeeping gene expression of each cell line respectively.
- the adjacent table shows a statistically significant difference in expression between sensitive and non-sensitive cell lines for AURKA and KXF2C gene expression.
- Statistical analysis was done using the Mann-Whitney U test and a p-value smaller than 0.05 was considered significant.
- the expression of Cip2a, AURKA and KIF2C are significantly higher in the FTY720-senstive cell lines (p values of ⁇ 0.05, ⁇ 0.02, ⁇ 0.001 respectively).
- Sensitive cell lines thus include the TNBC cell lines
- MDAMB231, BT-20 and Hs578T while non-sensitive cell lines include HCC1937, MDAMB436, MDAMB468, MDAMB453, BT-474, MCT-7 and SKBR-3.
- SEQ ID NO: 1 is a DNA sequence for AURKA.
- SEQ ID NO:2 is an amino acid sequence for AURKA.
- SEQ ID NO: 3 is a DNA sequence for KIF2C.
- SEQ ID NO:4 is an amino acid sequence for KIF2C.
- the invention provides a method of treating a patient having a cancer comprising an overexpression of AURKA and/or KIF2C, comprising administering to the patient a PP2A activator and thereby treating the cancer.
- Particular cancers and tumours that may be treated include stomach, colorectal, breast and pancreatic cancers and tumours, based on the high expression of AURKA and/or KIF2C in such cancers in the TCGA (The Cancer Genome Atlas) dataset according to the inventors' analysis (FIGURE 4).
- a particularly preferred cancer or tumour for treatment is breast cancer or a breast tumour.
- An especially preferred form of breast cancer for treatment is basal breast cancer.
- the cancer selected for treatment preferably has an overexpression of AURKA.
- a sequence for AURKA is provided at M_198433.2- all references to accession numbers herein relate to the sequence provided as of 22 March 2017.
- An AURKA nucleic acid sequence preferably comprises the sequence shown in SEQ ID NO: 1 or a variant thereof.
- An AURKA nucleic acid sequence may comprise the sequence of a transcript variant of SEQ ID NO: 1, such as the sequence of any one of NM_003600.3, NM_198434, NM_198435.2, NM_198436.3,
- An AURKA protein preferably comprises the sequence shown in SEQ ID NO: 2 or a variant thereof.
- the cancer may have an overexpression of KIF2C.
- the overexpression of KIF2C may be present without an overexpression of AURKA.
- KIF2C is an abbreviation for kinesin family member 2C, and is additionally referred to in the art as MCAK; CT139; KNSL6.
- a sequence for KIF2C is provided at NM_006845.3.
- AKIF2C nucleic acid sequence preferably comprises the sequence shown in SEQ ID NO: 3 or a variant thereof.
- An AURKA nucleic acid sequence may comprise the sequence of a transcript variant of SEQ ID NO: 3, such as the sequence of any one of NM_001297655.1, NM_001297656.1, or NM_001297657.1 or a variant of any thereof.
- a KIF2C protein preferably comprises the sequence shown in SEQ ID NO: 4 or a variant thereof.
- a KIF2C protein may comprise the sequence encoded by any of the above transcript variants of SEQ ID NO
- the variant will preferably be at least 90% homologous to that sequence based on amino acid identity, i.e. have at least 90% amino acid identity over the entire sequence. More preferably, the variant may be at least 95%, 97% or 99% homologous based on amino acid identity (or identical) to the amino acid sequence of SEQ ID NO: 2 or 4 over the entire sequence.
- a variant will preferably be at least 90% homologous to that sequence based on nucleotide identity over the entire sequence, i.e. have at least 90% nucleotide identity over the entire sequence. More preferably, the variant may be at least 95%, 97% or 99% homologous based on nucleotide identity (or identical) to the nucleotide sequence of SEQ ID NO: 1 or 3 over the entire sequence.
- Standard methods in the art may be used to determine homology.
- the UWGCG Package provides the BESTFIT program, which can be used to calculate homology, for example used on its default settings (Devereux et al (1984) Nucleic Acids Research 12, p387-395).
- the PILEUP and BLAST algorithms can be used to calculate homology or line up sequences (such as identifying equivalent residues or corresponding sequences (typically on their default settings)), for example as described in Altschul S. F. (1993) J Mol Evol 36:290-300; Altschul, S.F et al (1990) J Mol Biol 215:403-10.
- Software for performing BLAST analyses is publicly available through the National Center for Biotechnology Information (http://www.ncbi.nlm.nih.gov/).
- the cancer selected for treatment may have an overexpression or lack
- a cancer that originates from breast may have lack of overexpression ("negative") for one or more of FIER2, ER and PR, such as FIER2 and ER, HER2 and PR, ER and PR, PR and HER2, or HER2, ER and PR.
- FIER2, ER and PR such as FIER2 and ER, HER2 and PR, ER and PR, PR and HER2, or HER2, ER and PR.
- the cancer may have an overexpression of FIER2.
- FIER2 positive cancers may also display an overexpression of AURKA (Table 2).
- TNBC triple negative breast cancers
- Her2 positive breast cancers are aggressive tumours which may reflect a requirement for AURKA expression during mitosis (Afonso et al 2016.
- KIF2C is overexpressed almost exclusively in the Basal subtype of breast tumours, highly represented by TNBC patients (Table 2) and thus provides a marker for basal breast tumours
- the cancer may have an overexpression of one or more endogenous PP2A inhibitors.
- the endogenous PP2A inhibitors may be selected from one or more of SET, SETBP1, and CIP2A (as described in Grech et al supra), preferably comprising CIP2A.
- Figure 2A shows significant upregulation of CIP2A in cell lines sensitive to a PP2A activator.
- the cancer may have an underexpression of one or more PP2A subunits.
- the PP2A subunits may be selected from one or more of PP2AA, PPP2R2A, PPPR2R5A, PPP2R5C and PP2Ac (as described in Grech et al supra).
- the overexpression or underexpression of a given marker in the cancer is typically determined by comparison to the level of the marker in normal cells of the same tissue type.
- the expression is thus typically normalized against the expression level of other genes, preferably comprising one or more housekeeping genes.
- a marker may also be classified as showing an overexpression or underexpression in a threshold percentage of a population of cancer patients.
- the overexpression or underexpression in each patient in the population may be higher than 2 from the geometric mean. At least 10%, more preferably at least 15% or more of the patients in the population may display such an overexpression or underexpression.
- the inventors have identified that such an
- overexpression of AURKA is present in at least 15% of stomach, colorectal, breast and pancreatic cancers (FIGURE 4).
- the marker when expressed, its amount may be decreased by any amount, including to an undetectable amount or zero.
- the amount of FIER2 and/or ER and/or PR may be increased in the cancer or tumour by at least 10%, at least 30% at least 40%, at least 50%, at least 60%, at least 70%, at least 80%, at least 90% or at least 95%) compared with the level(s) of the same marker(s) in normal cells of the same type.
- the amount may be the amount of mRNA.
- the cancer may comprise an overexpression of AURKA and/or KIF2C mRNA.
- the cancer may comprise an increased amount of AURKA and/or KIF2C mRNA compared with normal cells of the same tissue type.
- the mRNA may be increased by any amount and in particular the % amounts discussed above.
- a marker may be underexpressed in the cancer as described above, with the cancer comprising an underexpression of mRNA of the marker in any amount, including in the % amounts discussed above.
- the amount of mRNA can be measured using a quantitative reverse transcription polymerase chain reaction (qRT-PCR), such as real time qRT-PCR, quantigene assay (Affymetrix/Thermo Fisher), by northern blotting or using microarrays.
- qRT-PCR quantitative reverse transcription polymerase chain reaction
- Affymetrix/Thermo Fisher quantigene assay
- mRNA expression is preferably determined by comparing the gene expression of a sample to the distribution of expression levels of the specific gene across a reference sample composed of tumours that are diploid for that gene.
- a z-score may be derived using RNAseq by expectation maximisation (RSEM) algorithm (cBioportal for Cancer
- SD higher or lower than the mean of the reference set is preferably considered as overexpression or underexpression respectively.
- the thresholds for determining expression may vary between techniques used, and may be validated against immunohistochemistry scores.
- the method of treating cancer in a patient may thus comprise (a) measuring the amount of AURKA and/or KIF2C in the cancer and (b) if the cancer comprises an overexpression of AURKA and/or KIF2C, administering to the patient a PP2A activator and thereby treating the cancer.
- the amount of AURKA and/or KIF2C may be the mRNA or protein amount, and the overexpression any overexpression discussed above.
- the above measurements may be carried out in any suitable sample from the patient.
- the measurements may be carried out in a cancer or tumour biopsy obtained from the patient.
- the biopsy tissue may be formalin fixed paraffin embedded (FFPE) tissue or fresh tissue.
- the tissue may be breast tissue, stomach tissue, colorectal tissue or pancreatic tissue. Any of the methods discussed above may be carried out on the cancer biopsy. Such methods may also be carried out on cancer cells circulating in the blood of the patient.
- the RNA methods may be carried out on urinary or blood exosomes.
- patient may be treated in accordance with the invention.
- the patient is typically human.
- patient may be another mammalian animal, such as a commercially farmed animal, such as a horse, a cow, a sheep, a fish, a chicken or a pig, a laboratory animal, such as a mouse or a rat, or a pet, such as a guinea pig, a hamster, a rabbit, a cat or a dog.
- a commercially farmed animal such as a horse, a cow, a sheep, a fish, a chicken or a pig
- a laboratory animal such as a mouse or a rat
- a pet such as a guinea pig, a hamster, a rabbit, a cat or a dog.
- a PP2 A activator is any molecule that increases PP2 A function.
- the activator may increase PP2A function by any amount.
- the PP2A activator may increase PP2A function or activity by at least 10%, at least 30% at least 40%, at least 50%, at least 60%, at least 70%, at least 80%, at least 90% or at least 95%.
- the extent to which an activator increases PP2A function may be determined by measuring PP2A function in cells in the presence and absence of the activator.
- the cells may be normal cells or cancer cells.
- the cells may be cancer cells as described above. They may preferably be breast cancer cells, such as T BC cells.
- the activator may affect PP2A function by any means. It may increase or decrease the activity or amount of any molecule affecting PP2A function directly or indirectly. For instance, it may increase the amount of one or more PP2A subunits, such as one or more PP2A subunits as described above. It may stabilise a PP2A complex. It may reduce degradation of one or more PP2A subunits. It may increase the amount of active PP2A complex. It may decrease the activity or amount of one or more molecules inhibiting PP2A function, such as one or more endogenous PP2A inhibitors as described above. It may increase the degradation of one or more such endogenous PP2A inhibitors at the mRNA or protein level, or decrease their function by inhibitory modification.
- It may decrease the transcription of a molecule inhibiting PP2A function, such as an endogenous inhibitor of PP2A. It may disrupt DNA encoding a molecule inhibiting PP2 A function, such as an endogenous inhibitor of PP2A, using an agent such as a zinc finger nuclease.
- the activator may act by binding the active site of the PP2A complex or act allosterically by binding at a different site.
- the activator may act by binding a regulator or ligand for the PP2A complex, to thereby enhance activation of PP2A or relieve inhibition of PP2A indirectly.
- the activator may be reversible or irreversible.
- the PP2A activator is a polynucleotide
- it may encode any molecule increasing PP2 A function. It may encode a PP2A subunit or any protein stabilising or activating a PP2A complex. It may encode a wildtype PP2A subunit, for example where a cancer represents a mutated version thereof unable to provide for PP2A activity or unable to assemble a PP2A complex.
- the polynucleotide may act to reduce the amount of a molecule inhibiting PP2A function or acting to deregulate PP2A activity.
- a polynucleotide such as a nucleic acid, is a polymer comprising two or more nucleotides.
- the nucleotides can be naturally occurring or artificial.
- a nucleotide typically contains a nucleobase, a sugar and at least one linking group, such as a phosphate, 2 ⁇ - methyl, 2' methoxy-ethyl, phosphoramidate, methylphosphonate or phosphor othioate group.
- the nucleobase is typically heterocyclic. Nucleobases include, but are not limited to, purines and pyrimidines and more specifically adenine (A), guanine (G), thymine (T), uracil (U) and cytosine (C).
- the sugar is typically a pentose sugar.
- Nucleotide sugars include, but are not limited to, ribose and deoxyribose.
- the nucleotide is typically a ribonucleotide or deoxyribonucleotide.
- the nucleotide typically contains a
- Phosphates may be attached on the 5' or 3' side of a nucleotide.
- nucleotides may contain additional modifications.
- suitable modified nucleotides include, but are not limited to, 2'amino pyrimidines (such as 2'- amino cytidine and 2' -amino uridine), 2'-hyrdroxyl purines (such as , 2'-fluoro
- the nucleotides in the polynucleotide may be attached to each other in any manner.
- the nucleotides may be linked by phosphate, 2'0-methyl, 2' methoxy-ethyl,
- the polynucleotide can be a nucleic acid, such as deoxyribonucleic acid (DNA) or a ribonucleic acid (RNA).
- the polynucleotide may be any synthetic nucleic acid known in the art, such as peptide nucleic acid (PNA), glycerol nucleic acid (GNA), threose nucleic acid (TNA), locked nucleic acid (LNA), morpholino nucleic acid or other synthetic polymers with nucleotide side chains.
- PNA peptide nucleic acid
- GMA glycerol nucleic acid
- TAA threose nucleic acid
- LNA locked nucleic acid
- morpholino nucleic acid or other synthetic polymers with nucleotide side chains.
- the polynucleotide may be single stranded or double stranded.
- the polynucleotide sequence may be cloned into any suitable expression vector.
- the polynucleotide sequence encoding a construct is typically opera- bly linked to a control sequence which is capable of providing for the expression of the coding sequence by the host cell.
- Such expression vectors can be used to express a construct.
- operably linked refers to a juxtaposition wherein the components described are in a relationship permitting them to function in their intended manner.
- a control sequence "operably linked" to a coding sequence is ligated in such a way that expression of the coding sequence is achieved under conditions compatible with the control sequences. Multiple copies of the same or different polynucleotide may be introduced into the vector.
- the expression vector may then be introduced into a suitable host cell.
- a construct can be produced by inserting a polynucleotide sequence encoding a construct into an expression vector, introducing the vector into a compatible bacterial host cell, and growing the host cell under conditions which bring about expression of the polynucleotide sequence.
- PP2A activator polynucleotides may reduce amounts of molecules acting to deregulate PP2A activity, such as endogenous PP2A inhibitors, present in the patient or the cancer, for example by knocking down their expression.
- Antisense and RNA interference (RNAi) technology for knocking down protein expression are well known in the art and standard methods can be employed to knock down expression of a molecule of interest. Both antisense and siRN A technology interfere with mRNA.
- Antisense oligonucleotides interfere with mRNA by binding to (hybridising with) a section of the mRNA.
- the antisense oligonucleotide is therefore designed to be complementary to the mRNA (although the oligonucleotide does not have to be 100% complementary as discussed below).
- the antisense oligonucleotide may be a section of the cDNA.
- the oligonucleotide sequence may not be 100% identical to the cDNA sequence. This is also discussed below.
- RNAi involves the use of double-stranded RNA, such small interfering RNA (siRNA) or small hairpin RNA (shRNA), which can bind to the mRNA and inhibit protein expression.
- the activator may comprise an oligonucleotide which specifically hybridises to an mRNA encoding an inhibitor of PP2 A function, such as an endogenous PP2A inhibitor described above.
- An oligonucleotide "specifically hybridises" to a target sequence when it hybridises with preferential or high affinity to the target sequence but does not substantially hybridise, does not hybridise or hybridises with only low affinity to other sequences. More preferably, the oligonucleotide hybridises to the target sequence with a Tm that is at least 5 °C, at least at least 10 °C, at least 20 °C, at least 30 °C or at least 40 °C, greater than its T m for other nucleic acids.
- hybridisation conditions may be stringent conditions as described in the art.
- Oligonucleotides are short nucleotide polymers which typically have 50 or fewer nucleotides, such 40 or fewer, 30 or fewer, 22 or fewer, 21 or fewer, 20 or fewer, 10 or fewer or 5 or fewer nucleotides.
- the oligonucleotide used may be 20 to 25 nucleotides in length, more preferably 21 or 22 nucleotides in length.
- the nucleotides can be naturally occurring or artificial.
- the nucleotides can be any of those described above.
- the PP2A activator may be an antibody which specifically binds to any target molecule (typically a protein) so as to increase PP2A function directly or indirectly.
- the target molecule may be a component of the PP2A complex.
- the antibody may bind to the component in such a way that activates PP2A function, including by displacing or blocking interaction between the component and a PP2A inhibitor, or by allosteric activation of the PP2A complex.
- the target molecule may be an inhibitory ligand for the PP2A complex or any other PP2A inhibitor or molecule acting to deregulate PP2A activity.
- the antibody typically binds to the target molecule to antagonise its activity, for example by blocking its binding to the PP2A complex or sequestering the target molecule.
- An antagonist antibody may act to decrease function of an endogenous PP2A inhibitor as described above.
- an antibody “specifically binds" to a protein when it binds with preferential or high affinity to that protein but does not substantially bind, does not bind or binds with only low affinity to other proteins.
- an antibody “specifically binds” a target molecule when it binds with preferential or high affinity to that target but does not substantially bind, does not bind or binds with only low affinity to other human proteins.
- the antibody may be, for example, a monoclonal antibody, a polyclonal antibody, a single chain antibody, a chimeric antibody, a bispecific antibody, a CDR-grafted antibody or a humanized antibody.
- the antibody may be an intact immunoglobulin molecule or a fragment thereof such as a Fab, F(ab') 2 or Fv fragment.
- Preferred PP2A activators include small molecule inhibitors of endogenous PP2A inhibitors or oligonucleotides reducing expression of these as described above.
- the endogenous PP2 A inhibitor may be IGBP1, SET, SETBP1 or CIP2A.
- the PP2A activator may be a SET inhibitor.
- a SET inhibitor may be an ApoE mimetic peptide binding to SET to inhibit its binding to PP2A.
- the SET inhibitor may disrupt a SET/PP2A complex.
- a preferred SET inhibitor is FTY720 (Fingolimod) or a functional derivative or analogue thereof, or any other analogue of myriocin acting as a PP2A activator.
- An example of an FTY720 analogue is OSU-2S.
- Another compound that may be used as a SET inhibitor is ceramide or any agent stimulating ceramide biosynthesis, such as vitamin D3. An agent stimulating ceramide biosynthesis may be used in
- the PP2A activator may be a SETBP1 inhibitor. It may prevent protection of SET from proteolytic cleavage by disrupting binding between SET and SETBP1.
- the PP2A activator may be an IGBP1 inhibitor. It may prevent binding of IGBP1 to the catalytic subunit of PP2A.
- APP2A activator may inhibit the phosphorylation of the catalytic subunit of PP2A and/or the demethylation of the C-terminus of the catalytic subunit of PP2A.
- Molecules upregulating expression of PP2A subunits may also be used as PP2A activators.
- An example includes methylprednisole or a functional derivative thereof.
- Other molecules that may be used as activators of PP2A by a variety of mechanisms include endostatin, forskolin, dithiolethionines such as anethole dithiolethione (ADT), carnosic acid, and functional derivatives and analogues thereof.
- Small molecule activators of PP2A are also described in McClinch et al (Therapeutic reactivation of PP2A for prostate cancer treatment; 2015 Nov 5-9, Molecular Targets and Cancer Therapeutics, Boston).
- the method of treatment with a PP2A activator may further comprise
- An AURKA antagonist is any molecule that decreases AURKA function.
- a KIF2C antagonist is any molecule that decreases KIF2C function.
- An antagonist may decrease both AURKA and KIF2C function.
- the function may be decreased in any % amount discussed above by reference to PP2A function.
- the antagonist of AURKA or KIF2C may increase PP2A activity in any % amount discussed above.
- the extent to which an antagonist decreases function may be determined by measuring AURKA or KIF2C function in cells in the presence and absence of the antagonist.
- the cells may be normal cells or cancer cells.
- the cells may be cancer cells as described above. They may preferably be breast cancer cells, such as T BC cells.
- the antagonist may decrease AURKA or KIF2C function by any means. It may increase or decrease the activity or amount of any molecule affecting AURKA or KIF2C function directly or indirectly. It may decrease the amount of AURKA and/or KIF2C at the mRNA or protein level. It may increase degradation of AURKA and/or KIF2C. It may decrease the function of AURKA and/or KIF2C by inhibitory modification. It may decrease the transcription of a molecule enhancing AURKA or KIF2C function. It may disrupt DNA encoding AURKA or KIF2C or a molecule enhancing AURKA or KIF2C function, using an agent such as a zinc finger nuclease.
- An AURKA antagonist or a KIF2C antagonist may be a small molecule inhibitor, a peptide, a protein, an antibody, a polynucleotide, an oligonucleotide, an antisense RNA, small interfering RNA (siRNA) or small hairpin RNA (shRNA). Selection of molecules such as antibodies, polynucleotides, oligonucleotides for targeting a gene of interest is described in detail above in relation to PP2A activators. The same criteria are described herein for selection of antagonists of AURKA and KIF2C.
- An antagonist of AURKA or KIF2C may be an oligonucleotide which specifically hybridises to an mRNA encoding AURKA or KIF2C or an mRNA encoding a molecule which enhances AURKA or KIF2C activity.
- An antagonist of AURKA or KIF2C may be a polynucleotide encoding any molecule that decreases AURKA or KIF2C function.
- An antagonist of AURKA or KIF2C may be an antibody which specifically binds to any target molecule (typically a protein) so as to decrease AURKA or KIF2C function directly or indirectly.
- the antagonist may be an antibody specifically binding AURKA or KIF2C.
- the antibody may decrease AURKA or KIF2C function by allosteric inactivation or by blocking interaction between its target and a ligand required for activity.
- An antagonist antibody specifically binding AURKA or KIF2C may decrease AURKA or KIF2C function in any % amount discussed above with reference to PP2A function.
- compositions may comprise, in addition to the therapeutically active ingredient(s), a pharmaceutically acceptable excipient, carrier, diluent, buffer, stabiliser or other materials well known to those skilled in the art. Such materials should be non-toxic and should not interfere with the efficacy of the active ingredient.
- a pharmaceutically acceptable excipient such materials should be non-toxic and should not interfere with the efficacy of the active ingredient.
- the pharmaceutical carrier or diluent may be, for example, an isotonic solution.
- carrier or other material may depend on the route of administration, e.g. oral, intravenous, cutaneous or subcutaneous, nasal, intramuscular and intraperitoneal routes. Examples of suitable compositions and methods of administration are provided in Esseku and Adeyeye (2011) and Van den Mooter G. (2006).
- solid oral forms may contain, together with the active substance, diluents, e.g. lactose, dextrose, saccharose, cellulose, corn starch or potato starch; lubricants, e.g. silica, talc, stearic acid, magnesium or calcium stearate, and/or polyethylene glycols; binding agents; e.g.
- starches gum arabic, gelatin, methylcellulose, carboxymethylcellulose or polyvinyl pyrrol- idone; disaggregating agents, e.g. starch, alginic acid, alginates or sodium starch glycolate; effervescing mixtures; dyestuffs; sweeteners; wetting agents, such as lecithin, polysorbates, laurylsulphates; and, in general, non-toxic and pharmacologically inactive substances used in pharmaceutical formulations.
- Such pharmaceutical preparations may be manufactured in known manner, for example, by means of mixing, granulating, tabletting, sugar-coating, or film-coating processes.
- Oral formulations include such normally employed excipients as, for example, pharmaceutical grades of mannitol, lactose, starch, magnesium stearate, sodium saccharine, cellulose, magnesium carbonate, and the like. These compositions take the form of solutions, suspensions, tablets, pills, capsules, sustained release formulations or powders and contain 10% to 95% of active ingredient, preferably 25% to 70%. Where the pharmaceutical composition is lyophilised, the lyophilised material may be reconstituted prior to administration, e.g. a suspension. Reconstitution is preferably effected in buffer.
- Capsules, tablets and pills for oral administration to an individual may be provided with an enteric coating comprising, for example, Eudragit "S”, Eudragit "L”, cellulose acetate, cellulose acetate phthalate or hydroxypropylmethyl cellulose.
- Liquid dispersions for oral administration may be syrups, emulsions or suspensions.
- the syrups may contain as carriers, for example, saccharose or saccharose with glycerine and/or mannitol and/or sorbitol.
- Suspensions and emulsions may contain as carrier, for example a natural gum, agar, sodium alginate, pectin, methylcellulose, carboxymethylcellulose, or polyvinyl alcohol.
- the suspensions or solutions for intramuscular injections may contain, together with the active substance, a pharmaceutically acceptable carrier, e.g. sterile water, olive oil, ethyl oleate, glycols, e.g. propylene glycol, and if desired, a suitable amount of lidocaine hydrochloride.
- Solutions for intravenous administration or infusion may contain as carrier, for example, sterile water or preferably they may be in the form of sterile, aqueous, isotonic saline solutions.
- binders and carriers may include, for example, polyalkylene glycols or triglycerides; such suppositories may be formed from mixtures containing the active ingredient in the range of 0.5% to 10%, preferably 1% to 2%.
- Polynucleotide or oligonucleotide inhibitors maybe naked nucleotide sequences or be in combination with cationic lipids, polymers or targeting systems. They may be delivered by any available technique.
- the polynucleotide or oligonucleotide may be introduced by needle injection, preferably intradermally, subcutaneously or
- polynucleotide or oligonucleotide may be delivered directly across the skin using a delivery device such as particle-mediated gene delivery.
- the polynucleotide or oligonucleotide may be administered topically to the skin, or to mucosal surfaces for example by intranasal, oral, or intrarectal administration.
- therapeutically effective amount (as the case may be, although prophylaxis may be considered therapy), this being sufficient to show benefit to the individual, e.g. an effective amount to prevent or delay onset of the disease or condition, to ameliorate one or more symptoms, to induce or prolong remission, or to delay relapse or recurrence.
- the dose may be determined according to various parameters, especially according to the substance used; the age, weight and condition of the individual to be treated; the route of administration; and the required regimen. A physician will be able to determine the required route of administration and dosage for any particular individual. Atypical daily dose is from about 0.1 to 50 mg per kg of body weight dependent on the conditions mentioned above.
- the dose may be provided as a single dose or may be provided as multiple doses, for example taken at regular intervals, for example 2, 3 or 4 doses administered hourly.
- polynucleotide or oligonucleotide inhibitors are administered in the range of 1 pg to 1 mg, preferably to 1 pg to 10 ⁇ g nucleic acid for particle mediated delivery and 10 ⁇ g to 1 mg for other routes.
- a composition may be administered alone or in combination with other therapeutic compositions or treatments, for example as adjunct therapy.
- the other therapeutic compositions or treatments may for example be one or more of those discussed herein, and may be administered either simultaneously or sequentially with the composition or treatment of the invention.
- the PP2A activator may be administered in combination with any other cancer therapy.
- the other cancer therapy may be selected from any known therapy for the relevant cancer.
- the other cancer therapy may comprise targeting of a molecule such as HER2, ER or PR. In particular where HER2, ER or PR is overexpressed in the cancer.
- the cancer therapy may comprise administration of an antagonist of HER2, ER or PR (or antagonists for more than one of HER2, ER and PR).
- antagonists may be a small molecule inhibitor, a peptide, a protein, an antibody, a polynucleotide, an oligonucleotide, an antisense RNA, small interfering RNA (siRNA) or small hairpin RNA (shRNA), selected according to criteria discussed above in relation to PP2A activators, applied to selection of molecules affecting HER21, ER or PR activity.
- Such molecules may antagonise the activity of HER2, ER or PR such as by decreasing their expression or specifically binding their encoding mRNA.
- the antagonists may be selected from antibodies specifically binding HER, ER or PR.
- the invention also provides medical uses corresponding to the methods of treatment described above.
- the invention thus provides a PP2A activator for use in treating cancer in a patient, wherein the cancer comprises an overexpression of AURKA and/or KIF2C. It also provides use of a PP2A activator in the manufacture of a medicament for treating cancer in a patient, wherein the cancer comprises an overexpression of AURKA and/or KIF2C.
- the cancer and PP2A activator may be selected from any described above in relation to methods of treatment. Selection of patients
- a patient may be treated with a PP2A activator as described above without previous determination that the patient overexpresses AURKA or KIF2C. This may occur where the patient is suspected of having deregulated PP2A activity or shows resistance to other treatments indicating that an overexpression of AURKA or KIF2C is likely to be present.
- a patient may be selected for treatments described above on the basis of being known to have a cancer comprising an overexpression of AURKA and/or KIF2C.
- the method of treatment may thus comprise a step of measuring expression of AURKA and/or KIF2C as described above.
- An overexpression of AURKA and/or KIF2C may be determined as described above.
- the patient may also be selected for said treatment on the basis of the cancer having an underexpression of one or more of HER2, ER and PR, as described above.
- the cancer may have an underexpression of each of HER2, ER and PR.
- the patient may thus be predicted to be resistant to therapy antagonising one or more of (or all of) HER2, ER and PR, such that therapy with a PP2A activator is appropriate.
- Such a patient may further be selected for said treatment based on having an overexpression of AURKA and/or KIF2C.
- the selection of the patient for treatment may be carried out on diagnosis of the cancer, during treatment of the cancer, or following resistance to a cancer therapy.
- the cancer therapy to which resistance is shown may comprise antagonism of one or more of HER2, ER and PR.
- diagnosis may be made by any means, and based on any symptoms. Selection may also be made based on a predisposition of the patient for a particular cancer, or a risk of the patient having a particular cancer.
- the invention provides a kit for treating cancer comprising (a) one or more reagents suitable for measuring expression of AURKA and/or KIF2C and (b) a PP2A activator.
- the kit thus provides components suitable both for determining whether a cancer has an overexpression of markers correlating with responsiveness to a PP2A activator, and a therapeutic agent for treatment purposes, the PP2A activator.
- Reagents suitable for measuring expression of AURKA and/or KIF2C are discussed in more detail below.
- the kit may additionally comprise means for the measurement of other laboratory or clinical parameters.
- the kit may additionally comprise one or more other reagents or instruments which enable the method to be carried out.
- reagents or instruments include one or more of the following: suitable buffer(s) (aqueous solutions), means to isolate AURKA and/or KIF2C from a sample, means to obtain a sample from the individual (such as a vessel or an instrument comprising a needle) or a support comprising wells on which quantitative reactions can be done.
- the kit may comprise instructions for determining whether there is an
- kits may comprise details regarding which individuals the method may be carried out upon.
- the individuals may be patients having the criteria for selection for treatment described above.
- kits of the invention for treating cancer comprises a PP2A activator and said details regarding which individuals the method may be carried out upon and/or said instructions for determining whether there is an overexpression of AURKA and/or KIF2C in a cancer.
- the reagents suitable for measuring expression of AURKA and/or KIF2C may then be provided separately to the kit.
- the invention further provides uses of AURKA and/or KIF2C in classification of cancer, and corresponding methods and systems.
- the invention further provides for prediction of responsiveness to treatment.
- the invention also provides for diagnosis and prognosis of cancer. Diagnosis includes determining whether or not an individual has a cancer or tumour and/or determining the severity of the cancer or tumour.
- Prognosis includes predicting whether or not an individual will develop a cancer or tumour, whether or not they will need treatment, the type of treatment the individual will need, whether or not they will respond to a treatment, whether or not and/or when they will suffer a cancer episode, recurrence or relapse, and the severity or duration of a symptom or a cancer episode, recurrence or relapse.
- the invention thus provides a method for detecting or diagnosing a cancer sensitive to a PP2A activator, in a patient, the method comprising measuring expression of AURKA and/or KIF2C in the patient, wherein overexpression of AURKA and/or KIF2C indicates that the patient comprises said cancer.
- a method for prognosing a cancer in a patient comprising determining whether or not the cancer comprises an overexpression of AURKA and/or KIF2C, wherein an overexpression of AURKA and/or KIF2C in the cancer indicates that the patient has a worse prognosis than in the situation of normal expression of AURKA and/or KIF2C.
- the method of prognosis may predict whether or not an individual in remission from cancer will have a recurrence. Predicting whether or not the individual will have a recurrence includes determining the likelihood that the individual will have a recurrence, and/or predicting when they will have a recurrence.
- the individual may be in remission following treatment with a therapy comprising antagonism of HER2 and/or ER and/or PR as described herein.
- the invention additionally provides a method for determining whether or not a patient having or suspected of having or being at risk of developing cancer will respond to treatment with a PP2A activator, which method comprises measuring expression of AURKA and/or KIF2C in the individual, and thereby predicting whether or not the patient will respond to treatment with a PP2A activator. Additionally to predicting responsiveness to treatment with a PP2A activator, the method may also further predicting responsiveness to treatment with an AURKA antagonist and/or a KIF2C antagonist.
- the method is for predicting whether or not the individual will have a primary response to treatment with the therapy, i.e. whether or not the individual will respond when first receiving the treatment.
- the method is for pre- dieting secondary non-responsiveness, i.e. whether or not an individual who initially responds to treatment will later stop responding to treatment or will respond less well to the treatment.
- an increased level of AURKA and/or KIF2C in an individual indicates a positive diagnosis relating to the presence of cancer, for example that the individual has a cancer or a particular form of cancer or has more severe cancer.
- An increased level of AURKA and/or KIF2C also indicates a negative prognosis, that is a poor predicted outcome for the individual, for example that the individual will not respond to a particular therapy, that an individual in remission from cancer will have a recurrence or that the individual is at in- creased risk of developing the cancer.
- the method of diagnosis or prognosis may include selecting or recommending a suitable treatment for the individual, i.e. based on the diagnosis or prognosis.
- the selected or recommended treatment may then be administered to the individual.
- an overexpression of AURKA and/or KIF2C indicates that the individual will respond to therapy with a PP2A activator.
- a therapy including use of a PP2A activator may then be selected or recommended, and may then further be administered to the individual.
- a therapy comprising use of an AURKA antagonist and/or KIF2C antagonist may be selected based on the overexpression of AURKA and/or KIF2C.
- a decreased or normal level of AURKA and/or KIF2C indicates that the individual will not respond to therapy with a PP2A activator, and/or may not have a deregulation of PP2A.
- a PP2A activator therapy is then not administered to the individual.
- a therapeutic treatment other than a PP2A activator may be selected or recommended for treatment of the individ- ual, and may then further be administered to the individual.
- an individual having cancer e.g. breast cancer or basal breast cancer
- an individual suspected of having the disease or condition and/or an individual at risk of developing the disease or condition may be selected for treatment or identified.
- the individual may not have been formally diagnosed but may be suspected of having the disease or condition because of the presence of one or more symptoms.
- the individual may be considered at risk of developing cancer if they have one or more risk factors associated with cancer and/or one or more predispositions which increase their susceptibility to cancer.
- the invention also provides a method for classifying a cancer in a patient, the method comprising measuring expression of AURKA and/or KIF2C in the patient, and classifying the cancer as of a particular subtype based on the expression.
- the method may comprise classifying the cancer as of a more aggressive subtype, based on overexpression of AURKA and/or KIF2C.
- a breast cancer may be classified as a luminal or basal breast cancer, wherein overexpression of AURKA and/or KIF2C classifies the cancer as a basal breast cancer, and wherein normal or decreased expression of AURKA and/or KIF2C classifies the cancer as a luminal breast cancer.
- the methods for classifying a cancer may further comprising measuring expression of one or more of HER2, ER and PR to further classify the cancer as positive for expression or
- HER2 is further measured as part of the classification.
- the cancer may be classified as triple negative for expression of HER2, ER and PR, as showing decreased expression or no detectable expression of any of the three markers.
- expression of both AURKA and KIF2C may be measured in the patient.
- An overexpression of AURKA and/or KIF2C may be determined as described above.
- AURKA and/or KIF2C are measured and compared with reference levels for normal AURKA and/or KIF2C expression as discussed above, typically in normal tissue of the same type as the cancer.
- the cancer may be any cancer or tumour described above, and is preferably stomach, colorectal, pancreatic, or breast cancer or tumour, most preferably a breast cancer or tumour.
- the cancer may be a basal breast cancer All of the above methods may further comprise measuring expression of one or more of HER2, ER and PR in the patient, or any combination thereof as described above, including all of HER2, ER and PR.
- the methods may also further comprise determining whether there is a deregulation of PP2A in the patient by detection of expression of other markers of PP2A deregulation, or determination of reduced PP2A activity by any means discussed above.
- Markers of PP2 A deregulation may comprise overexpression of one or more endogenous PP2A inhibitors, such as one or more of CIP2A, SET, IGBPB1 and SETBPl .
- Markers of PP2A deregulation may comprise underexpression or mutation of one or more PP2A subunits as described above.
- the kit preferably comprises reagents suitable for detecting expression of AURKA and KIF2C.
- the kit may further comprise reagents suitable for detecting expression of one or more endogenous inhibitors of PP2A or one or more PP2A subunits.
- the kit may comprise reagents suitable for detecting expression of one or more of CIP2A, SET, SETBP 1 , IGBP 1 , such as CIP2A and SET, SET and SETBP 1 , CIP2A and SETBP 1 , CIP2 A and IGBPl, SET and IGBPl; and SETBPl and IGBPl, or of expression of all of CIP2A, SET, SETBP, IGBPl .
- the kit preferably comprises a reagent suitable for detecting expression of CIP2A.
- the kit may alternatively or additionally comprise reagents suitable for detecting expression of one or more of PP2AA, PPP2R2A, PPPR2R5A, PPP2R5C and PP2Ac.
- the kit preferably comprises reagents suitable for detecting expression of PP2Ac and/or PPP2R2A.
- the only reagents for detecting expression of genes (at the protein, or mRNA level) included in the kit may be reagents detecting the combinations of genes listed above.
- the kit may comprise reagents for detecting expression of AURKA and/or KIF2C, and one or more housekeeping genes, and no other reagents for detection of expression of any genes.
- Such a kit may comprise reagents for detection of expression of up to two, up to five or up to ten housekeeping genes.
- Such a kit may include additional reagents for detection of expression of one or more endogenous PP2A inhibitors as described above, and/or for detection of expression of one or more PP2A inhibitors as described above, and no other reagents for detection of expression of any genes.
- the reagents are typically suitable for measuring the expression level of the relevant marker. In this manner, whether the cancer displays an overexpression or underexpression of the marker may be determined by comparison with a reference level, as described above.
- the reagents may be suitable for measuring mRNA expression or protein expression.
- the reagents suitable for detecting expression of particular markers may be selected from nucleic acid probes or primers and antibodies specifically hybridising to the nucleic acid sequence of the relevant marker or specifically binding the marker protein.
- Expression levels may be determined by, for example, flow cytometry or by quantitative immunohistochemistry analysis on histological sections of patient intestinal tissue.
- the invention provides a system for classifying cancer in a patient, or for predicting responsiveness of a cancer patient to treatment with a PP2A activator, the system comprising:
- the measuring module may be configured for determining expression of one or more other markers for detection of cancer described herein, and the other modules configured to further take into account expression of such markers in the determination of the presence of cancer, classification of cancer, prognosis of cancer or prediction of responsiveness to treatment with a PP2A activator.
- the correlation between expression of the other markers and the detection, diagnosis or prognosis is made as described above.
- TCGA publicly available databases
- Basal breast cancer cell line MDAMB231 was sensitive to the PP2A activator, FTY720, and showed a suppressed PP2A activity while the MDAMB453 Luminal cell line was not sensitive to FTY720 and had relatively high PP2A activity.
- Drug sensitivity is the inverse of percent viability.
- the dose-dependent effect of FTY720 on breast cancer cell lines provided information on the sensitivity of the cell line to PP2A activation. Cytotoxicity results for the 12 breast cancer cell lines tested are illustrated in Figure 1 where the % cell viability is expressed as a percentage of the parallel control culture (without drug) against FTY720 concentration.
- the average vehicle control (VC) % cell viability for each cell line was never under 85% viability compared to the untreated ruling out any interference by the vehicle.
- the ⁇ and the 25 ⁇ doses were considered to be cytotoxic as cellular morphology was generally altered, and hence are not shown.
- the three sensitive cell lines defined by % cell viability under 50% (IC50) at a dose lower than 5 ⁇ , were represented by a Triple Negative phenotype ( Figure 1 A).
- BT- 20 was the most sensitive at 0.5 ⁇ , followed by MDAMB231 and Hs578T showing and IC50 at 2.5 ⁇ FTY720 and 5 ⁇ FTY720, respectively. From this experiment, the effective dose of FTY720, that is not lethal, was set at 5 ⁇ for assessing the effect of FTY720 on RNA expression.
- MCFlOA is a cell-line derived from normal epithelium. This cell line was used as a baseline control in the study of the PP2A mechanism in breast cancer cell lines.
- PP2A biomarker genes were identified. As outlined in various studies, a biomarker needs to be well defined in its objectives, use and target population (Altar et al., 2007; Pepe, Feng, Janes, Bossuyt, & Potter, 2008). The approach for biomarker discovery involved the use of breast cancer data in the TCGA data portals in the context of PP2 A deregulation. Genes were shortlisted using network analysis and known biological evidence connecting biomarkers to the PP2A pathway.
- the set of biomarkers was validated and evidence-based selection of biomarker candidates, identified AURKA and KTF2C as strong predictors of sensitivity to FTY720. These genes were used to classify patients and cell lines into those that are eligible to PP2A activation and those that are not predicted to have PP2A deregulation.
- the novel therapeutic class was mainly represented by the Basal or Triple Negative groups and was associated with higher tumour aggressivity.
- the expression of the PP2A complex and regulator genes was measured in the 12 breast cancer cell lines when untreated, but also when treated with FTY720 (5 ⁇ ).
- Figure 2 shows that Cip2a (KIAA1524) RNA expression correlates with sensitivity of breast cancer cell lines to FTY720 ( Figure 2).
- MDA-MB-231 exemplifies FTY720- sensitive breast cancer cell lines, showing a low PP2A enzymatic activity and a high Cip2a RNA expression relative to MCF10A (a cell line derived from normal epithelium).
- Table 1 Spearman correlation analysis between the expression of the PP2A complex subunits and the 2 biomarkers.
- Example 3 - PP2A activity biomarkers are correlated with protein expression of inhibitors and pS6K
- AURKA expression was also found to correlate strongly with cytoplasmic cip2a staining (Table 4). AURKA significantly correlates with nuclear pS6K, establishing an association between AURKA expression and growth factor (PBK/mTOR) signaling attenuation as part of the negative feedback driven by PP2A.
- PBK/mTOR growth factor
- Table 4 Spearman correlations between PP2A activity biomarker expression and the protein expression of inhibitors ofPP2A and downstream phospho-proteins with defined localisation in the breast cancer cell lines.
- a method of treating cancer in a patient comprising administering an AURKA antagonist and/or a KIF2C antagonist to the patient and thereby treating the cancer.
- a method according to any one of the preceding items wherein the patient is selected for said treatment on the basis of the cancer having an underexpression of one or more of HER2, ER and PR. 11. A method according to item 9 or 10 wherein said selection for treatment is carried out on diagnosis of the cancer, during treatment of the cancer, or following resistance to a cancer therapy.
- the PP2A activator is a small molecule, a protein, an antibody, a polynucleotide, an oligonucleotide, an anti sense RNA, a small interfering RNA (siRNA) or a small hairpin RNA (shRNA).
- a method of treating cancer in a patient comprising (a) measuring amount of AURKA and/or KIF2C in the cancer and (b) if the cancer comprises an overexpression of AURKA and/or KIF2C, administering to the patient a PP2A activator and thereby treating the cancer.
- a method for detecting cancer in a patient comprising measuring expression of AURKA and KIF2C in the patient, wherein overexpression of AURKA and KIF2C indicates that the patient comprises a cancer.
- a method for prognosing a cancer in a patient comprising determining whether or not the cancer comprises an overexpression of AURKA and/or KIF2C, wherein an overexpression of AURKA and/or KIF2C in the cancer indicates that the patient has a worse prognosis than in the situation of normal expression of AURKA and/or KIF2C. 22.
- a method for determining whether or not a patient having or suspected of having or being at risk of developing cancer will respond to treatment with a PP2A activator comprises measuring expression of AURKA and/or KIF2C in the individual, and thereby predicting whether or not the patient will respond to treatment with a PP2A activator.
- a method for classifying a cancer in a patient comprising measuring expression of AURKA and/or KIF2C in the patient, and classifying the cancer as of a particular subtype based on the expression.
- 24. The method according to any one of items 20 to 23, which further comprises measuring expression of one or more of HER2, ER and PR in the patient.
- overexpression of AURKA and/or KIF2C classifies the cancer as a basal breast cancer, and wherein normal expression of AURKA and/or KIF2C classifies the cancer as a luminal breast cancer.
- a kit for treating cancer comprising (a) one or more reagents suitable for measuring expression of AURKA and/or KIF2C and (b) a PP2A activator.
- a system for detecting, classifying or prognosing cancer in a patient, or for predicting responsiveness of a cancer patient to treatment with a PP2A activator comprising:
- an output module configured to display whether or not the patient has cancer based on the comparison
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Abstract
L'invention concerne le traitement et la classification du cancer, en particulier du cancer du sein. Elle concerne l'identification de patients susceptibles de répondre à une thérapie anticancéreuse avec un activateur de la protéine phosphatase de type 2A (PP2A).
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RU2762317C1 (ru) * | 2021-02-24 | 2021-12-17 | Федеральное государственное бюджетное научное учреждение "Томский национальный исследовательский медицинский центр Российской академии наук" (Томский НИМЦ) | Способ прогнозирования статуса рецептора эпидермального фактора роста her2/neu в основном опухолевом узле у больных раком молочной железы |
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RU2762317C1 (ru) * | 2021-02-24 | 2021-12-17 | Федеральное государственное бюджетное научное учреждение "Томский национальный исследовательский медицинский центр Российской академии наук" (Томский НИМЦ) | Способ прогнозирования статуса рецептора эпидермального фактора роста her2/neu в основном опухолевом узле у больных раком молочной железы |
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