EP3097209A1 - Nouvelle méthode de dépistage du cancer de la prostate - Google Patents
Nouvelle méthode de dépistage du cancer de la prostateInfo
- Publication number
- EP3097209A1 EP3097209A1 EP15704352.2A EP15704352A EP3097209A1 EP 3097209 A1 EP3097209 A1 EP 3097209A1 EP 15704352 A EP15704352 A EP 15704352A EP 3097209 A1 EP3097209 A1 EP 3097209A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- rm6p
- gene
- expression
- prostate
- subject
- 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.)
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- C—CHEMISTRY; METALLURGY
- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12Q—MEASURING OR TESTING PROCESSES INVOLVING ENZYMES, NUCLEIC ACIDS OR MICROORGANISMS; COMPOSITIONS OR TEST PAPERS THEREFOR; PROCESSES OF PREPARING SUCH COMPOSITIONS; CONDITION-RESPONSIVE CONTROL IN MICROBIOLOGICAL OR ENZYMOLOGICAL PROCESSES
- C12Q1/00—Measuring or testing processes involving enzymes, nucleic acids or microorganisms; Compositions therefor; Processes of preparing such compositions
- C12Q1/68—Measuring or testing processes involving enzymes, nucleic acids or microorganisms; Compositions therefor; Processes of preparing such compositions involving nucleic acids
- C12Q1/6876—Nucleic acid products used in the analysis of nucleic acids, e.g. primers or probes
- C12Q1/6883—Nucleic acid products used in the analysis of nucleic acids, e.g. primers or probes for diseases caused by alterations of genetic material
- C12Q1/6886—Nucleic acid products used in the analysis of nucleic acids, e.g. primers or probes for diseases caused by alterations of genetic material for cancer
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07K—PEPTIDES
- C07K16/00—Immunoglobulins [IG], e.g. monoclonal or polyclonal antibodies
- C07K16/18—Immunoglobulins [IG], e.g. monoclonal or polyclonal antibodies against material from animals or humans
- C07K16/28—Immunoglobulins [IG], e.g. monoclonal or polyclonal antibodies against material from animals or humans against receptors, cell surface antigens or cell surface determinants
- C07K16/2863—Immunoglobulins [IG], e.g. monoclonal or polyclonal antibodies against material from animals or humans against receptors, cell surface antigens or cell surface determinants against receptors for growth factors, growth regulators
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07K—PEPTIDES
- C07K16/00—Immunoglobulins [IG], e.g. monoclonal or polyclonal antibodies
- C07K16/18—Immunoglobulins [IG], e.g. monoclonal or polyclonal antibodies against material from animals or humans
- C07K16/28—Immunoglobulins [IG], e.g. monoclonal or polyclonal antibodies against material from animals or humans against receptors, cell surface antigens or cell surface determinants
- C07K16/30—Immunoglobulins [IG], e.g. monoclonal or polyclonal antibodies against material from animals or humans against receptors, cell surface antigens or cell surface determinants from tumour cells
- C07K16/3069—Reproductive system, e.g. ovaria, uterus, testes, prostate
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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
- G01N33/53—Immunoassay; Biospecific binding assay; Materials therefor
- G01N33/575—Immunoassay; Biospecific binding assay; Materials therefor for cancer
- G01N33/57555—Immunoassay; Biospecific binding assay; Materials therefor for cancer of the prostate
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- C—CHEMISTRY; METALLURGY
- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12Q—MEASURING OR TESTING PROCESSES INVOLVING ENZYMES, NUCLEIC ACIDS OR MICROORGANISMS; COMPOSITIONS OR TEST PAPERS THEREFOR; PROCESSES OF PREPARING SUCH COMPOSITIONS; CONDITION-RESPONSIVE CONTROL IN MICROBIOLOGICAL OR ENZYMOLOGICAL PROCESSES
- C12Q2600/00—Oligonucleotides characterized by their use
- C12Q2600/158—Expression markers
Definitions
- the present invention relates to a new method of diagnosis or screening for prostate cancer.
- Prostate cancer is the most common cancer in France and is the fourth leading cause of death in the population.
- PSA prostate specific antigen
- Prostate Specifies Antigen has been widespread and 70% of men over 50 years of age perform at least one PSA assay. a period of 3 years (2012 figures from the National Fund for the Health Insurance of Employees).
- a prostate cancer lesion is histologically reflected by the loss of basal cells.
- basal cell markers p63, CK 903, CK 5/6
- p63, CK 903, CK 5/6 antibodies against basal cell markers
- CK 903, CK 5/6 antibodies against basal cell markers
- their specificity and sensitivity are limited, and non-cancerous lesions (adenosis, atypical adenomatous hyperplasia, atrophy or post atrophic hyperplasia) may present a discontinuity of basal cells, which makes interpretation difficult 5 ' 6 .
- AMACR ® As examples of markers of prostate cancer cells other than PSA considered to date for diagnosis, mention may be made AMACR ® , GSTP1 Methyl ® and TMPRSS2-ETS ® .
- AMACR ® (P504S) is the trade name of an antibody specific for the " ⁇ -methylacyl CoA Racemase" tissue protein that is over-expressed in prostate cancer 7 . This antibody has been developed to analyze the expression profile in prostate biopsies.
- markers AMACR ®, methylated GSTP1 ®, TMPRSS2-ETS ®
- AMACR ® methylated GSTP1 ®
- TMPRSS2-ETS ® methylated GSTP1 ®
- TMPRSS2-ETS ® methylated GSTP1 ®
- TMPRSS2-ETS ® methylated GSTP1 ®
- TMPRSS2-ETS ® methylated GSTP1 ®
- prostate cancer The diagnosis of prostate cancer is currently made by pathological examination of a series of prostate biopsies (10 to 12 cores 17 mm long obtained by an 18 gauge needle). The samples are regularly distributed under ultrasound control on the prostate volume for mapping. Prostate cancer is heterogeneous and cancerous foci can emerge in either prostate lobe or both. The diagnosis of prostate cancer depends on the quality of the sample and how it is performed. In addition, despite histological observation and analysis of basal cell markers, some non-cancerous tissue lesions may mimic a cancer diagnosis or conversely, a cancerous lesion may escape diagnosis, requiring the addition of Tissue markers specific for prostate cancer cells.
- One of the aims of the present invention is therefore to propose a method of diagnosing prostate cancer that does not have the drawbacks of those proposed to date.
- Another object of the invention is to provide a specific method of diagnosis of prostate cancer.
- Another object of the present invention is to diagnose prostate cancer when the latter is at an early stage. Another object of the invention is to diagnose a small prostate cancer.
- the present invention results from the surprising and unexpected discovery of tissue-level overexpression of the cation-independent mannose 6-phosphate receptor (hereinafter referred to as RM6P-CI) in prostate cancer epithelial cells relative to healthy prostate cells.
- RM6P-CI tissue-level overexpression of the cation-independent mannose 6-phosphate receptor
- RM6P-CI is overexpressed in a large majority of prostate cancer tissue but that it is not in healthy prostate tissue.
- RM6P-CI is a ubiquitous 300 kDa receptor present on the cell surface. It is involved in many biological functions and mainly in the addressing of enzymes to the lysosome 9 . These lysosomal enzymes have mannose 6-phosphate residues (M6P) allowing them to be recognized and then internalized by the RM6P-CI.
- M6P mannose 6-phosphate residues
- RM6P-CI is also called Insulin Growth Factor 2 receptor (IGF2) since it has a TIGF2 binding site and is involved in the degradation of this mitogen 4 .
- IGF2R Insulin Growth Factor 2 receptor
- IGF2R have the same nucleotide sequence and are in fact the same gene (gene identified by the number” 3482 "as of January 15, 2015).
- the genomic sequence of RM6P-CI (or IGF2R) is located on chromosome 6 and is described under accession number NCBI, NG_011785.1.
- the corresponding mRNA sequence is described under accession number NCBI, NM_000876.2 and the protein sequence under accession number NP_000867.2.
- RM6P-CI has been characterized as a tumor suppressor gene.
- the RM6P-CI receptor In liver, breast, lung, ovarian or even adenocortical tumors, the RM6P-CI receptor exhibits a loss of heterozygosity and numerous somatic mutations 10 ' 11 ' 12 . Post-transcriptional and post-translational modifications result in decreased expression of the receptor RM6P-CI in these cancers, except for breast cancer where its concentration is unchanged between healthy and cancerous tissues 13.
- the role of tumor suppressor for the RM6P-CI gene has been proposed through overexpression induction 14 or conversely inhibition of the expression of RM6P-IC 15 .
- overexpression of RM6P-CI decreases the ability of cells to induce tumors and decreases the rate of tumor growth.
- inhibition of RM6P-CI increases cell growth and decreases the apoptotic index.
- the inventors overcame a technical prejudice by showing that the RM6P-CI gene is a relevant marker in the screening or diagnosis of prostate cancer.
- RM6P-CI a new marker of the invention
- the present invention relates to a method for in vitro diagnosis of prostate cancer in a subject characterized in that it comprises a step of measuring the level of expression of the RM6P-CI gene in a prostate tissue sample of said subject the determination of overexpression of said RM6P-CI gene being indicative of the presence of prostate cancer in said subject.
- the "diagnostic method” of the invention may also be called “diagnostic method”.
- the method of the invention is implemented for the diagnosis, prognosis and / or evaluation of the evolution of a cancer.
- overexpression of the RM6P-CI gene in prostate tissue indicative of prostatic cancer in a subject, overexpression of the RM6P-CI gene in prostate tissue indicative of prostatic cancer.
- diagnosis means the determination of a condition of a person affected by a given pathology, and "prognosis” the evaluation of the degree of severity and the subsequent course of a pathology.
- overexpression of the RM6P-CI gene means an expression of the RM6P-CI gene at the level of the prostatic tissue which is at least three times greater than the expression of this gene at the level of a non-cancerous prostate tissue.
- prostate tissue sample is a prostate cancer tissue sample, in other words, the subject to which said sample belongs has prostate cancer.
- This overexpression will be at least three times greater, but may for example be ten, twenty or even a hundred times greater than the expression of the gene of the
- RM6P-CI in a "normal", that is, non-cancerous, prostate tissue.
- the subject of the present invention is a method for the in vitro diagnosis of prostate cancer in a subject characterized in that it comprises the following steps:
- a higher expression level means for example a protein expression (measured by various techniques such as Western blots, ELIS A, biosensors, receptor-specific ligands or any method of quantifying a protein or a receptor) to a minimum 3 times higher than that of a reference biological sample corresponding, for example, to healthy prostate tissue.
- a protein expression measured by various techniques such as Western blots, ELIS A, biosensors, receptor-specific ligands or any method of quantifying a protein or a receptor
- a reference biological sample corresponding, for example, to healthy prostate tissue.
- it is also possible to evaluate the overexpression of the RM6P-CI gene in a prostatic tissue by evaluating the percentage of the cells of said prostate tissue which are stained by an immunohistological test.
- the presence of a 3-fold increase in immunohistochemical staining in more than 10% of the epithelial cells is indicative of prostate cancer tissue.
- the "subject" within the meaning of the present invention refers to a vertebrate individual, in particular a mammal, more particularly a man.
- prostatic tissue sample means all or part of the prostate taken from a subject or a patient.
- the prostatic tissue comprises prostate cells, said cells possibly being cancerous cells or healthy cells.
- the prostate tissue sample taken from the subject or the patient is derived from a prostate biopsy.
- the “reference biological sample” is obtained from human cell cultures or tissue samples.
- the biological reference sample designates a biological sample as defined above derived from:
- the invention allows the monitoring and monitoring of a patient suffering from prostate cancer and undergoing anticancer treatment.
- the method according to the invention is further characterized in that the step of measuring the level of expression of the RM6P-CI gene is a step of measuring, in a prostate tissue sample, the level of expression:
- transcription products in particular mRNA and / or
- Overexpression of the transcription products, in particular the mRNA, and / or overexpression of the translation products, in particular the RM6P-CI protein, is then indicative of prostate cancer, said overexpression being as defined above ( increase by a factor of at least three of the expression level of the transcription and / or translation products).
- Measurement of the level of expression of the RM6P-CI target gene can be achieved by any technique known to those skilled in the art.
- the level of expression of the RM6P-CI gene at the nucleic and / or protein level is advantageously measured, for example by measuring the amount of transcribed mRNA and / or measuring the amount of mRNA. of RM6P-CI protein using at least one specific method for measuring the level of expression of RM6P-CI.
- RNA chip any appropriate technique for quantifying mRNA, such as an RNA chip, methods LCR (“Ligase Chain Reaction”), TMA (“Transcription Mediated Amplification”), PCE (“enzyme amplified immunoassay”) and DNA (“branched DNA signal amplification”) etc.
- the overexpression of the RM6P-CI gene is determined when the expression of said RM6P-CI gene is at least three times greater than that of said gene in a non-cancerous prostate tissue.
- the step of measuring the level of expression of the translation products of the RM6P-CI gene, in particular the RM6P-CI protein is by immunohistochemically labeling said RM6P-CI translation products in said prostate tissue sample of said subject.
- the analysis of the immunohistochemical staining of the translation products is evaluated by staining the cells of the prostate tissue sample, staining of more than 10% of said cells being indicative of overexpression of said translation products of said gene.
- RM6P-CI on cytological material or on tissue sections.
- this step is done on a chip.
- said chip is a chip of the "Multi Array Fabric” type.
- microchips in diagnostics allows, on a miniaturized format, the size of a glass slide, the analysis and visualization of molecular targets in a large number of tissue samples simultaneously, at the DNA level, RNA or protein.
- a chip makes it possible to obtain immunohistochemical (IHC) expression profiles from archived fixed tissues, included in paraffin but also from fresh or frozen tissues.
- IHC immunohistochemical
- the step of measuring the level of expression of the RM6P-CI protein in a prostate tissue sample is done using the polyclonal IgY 415 antibody.
- This IgY 415 antibody was established in hen 18 and previously described for immunohistochemical analysis 19 .
- the subject of the invention is also an RM6P-CI specific antibody for use in an in vitro method for diagnosing prostate cancer in a subject, said antibody making it possible to measure the level of expression of the prostate cancer gene.
- RM6P-CI in a prostate tissue sample of said subject determining overexpression of said RM6P-CI gene being indicative of the presence of prostatic cancer in said subject.
- the expression of the RM6P-CI gene may for example also be detected by ligand binding.
- the specific binding of mannose 6-phosphate analogs to RM6P-CI receptors can be quantified 9 .
- this RM6P-CI receptor is a multifunctional protein because it is also the specific receptor for IGF2 (Insulin-like Growth Factor 2) 4 .
- IGF2 Insulin-like Growth Factor 2
- the expression of the RM6P-CI gene can still be detected by biosensors either on prostatic tissues taken by biopsies or directly in situ on prostatic tissues of the subject.
- these biosensors may be, for example, made of optical fibers introduced into the prostate by techniques known to those skilled in the art. It is also possible, for in situ detection, to inject intravenously, in the subject to be diagnosed, nanoparticles. Once injected, these nanoparticles will accumulate preferentially in the cancerous tissue.
- the subject of the present invention is also a method for the in vivo diagnosis of a prostate cancer in a subject, characterized in that it comprises a step of measuring the level of expression of the mannose 6-phosphate cation receptor independent gene ( RM6P-CI gene) in the prostate tissue of said subject, determining overexpression of said RM6P-CI gene in said prostate tissue indicative of the presence of prostate cancer in said subject.
- RM6P-CI gene mannose 6-phosphate cation receptor independent gene
- the step of measuring the level of expression of the RM6P-CI gene in the prostatic tissue will be, for example, a step of measuring the level of expression of the translation products, in particular the RM6P-1 protein. CI in said tissue.
- the subject of the invention is also an RM6P-CI-specific antibody for use in an in vivo diagnostic method for prostate cancer in a subject, said antibody making it possible to measure the level of expression of the prostate cancer gene.
- RM6P-CI in the prostate tissue of said subject determining overexpression of said RM6P-CI gene being indicative of the presence of prostatic cancer in said subject.
- kits comprising at least one reagent specific for the product of the expression of the RM6P-CI gene, preferably chosen from:
- nucleic sequence capable of specifically hybridizing with a fragment of the mRNA encoding RM6P-CI
- the present invention further relates to a method for therapeutic treatment of prostate cancer in a subject, characterized in that it comprises:
- A) a method for in vitro or in vivo diagnosis of prostate cancer in a subject comprising a step of measuring the level of expression of the RM6P-CI gene, the determination of an overexpression of said RM6P-CI gene being indicative of the presence of prostate cancer in said subject,
- step B) is a conventional treatment step for prostate cancer.
- step B) is a conventional treatment step for prostate cancer.
- radiotherapy such as external beam radiotherapy and brachytherapy
- hormone therapy hormone therapy
- step B The choice of the therapeutic strategy implemented in step B) depends, among other things, on the characteristics of the cancer as diagnosed in step A).
- FIGS. 1 and 2 The invention will be better understood in the light of the following nonlimiting and purely illustrative examples, and FIGS. 1 and 2.
- Figure 1 illustrates the expression patterns of the RM6P-CI receptor in various prostate cancer tissues (Fig. 1a) and in healthy prostatic tissues (Fig. 1b). The scale indicated represents 500 ⁇ .
- Figure 2 shows two types of immunohistochemical markings of the RM6P-CI gene.
- the indicated scale represents 100 ⁇ .
- Figures 2a and 2b illustrate the overexpression of RM6P-CI in cancerous prostate tissue because of their labeling (coloring symbolized by solid arrows) using the anti-RM6P-CI IgY 415 antibody.
- the cell nuclei are reported by hollow arrows.
- Figures 2c and 2d illustrate healthy prostate tissue.
- Figures 2e and 2f illustrate the immunohistochemical analysis of two parts of the same sample in the absence (Fig. 2e) or in the presence (Fig. 2f) of an excess of purified RM6P-CI to block immunostaining.
- the biopsies are performed routinely and finalize the diagnosis as soon as digital rectal examination is suspect or the total PSA level is higher than 4.
- the urologist first performs an endorectal ultrasound to locate the location where the biopsy will be performed, which is then performed as a series of 10 to 12 (or more if necessary) samples using a needle with automatic release.
- the duration of the sampling is very short (5-15 minutes) and the examination is painless. Complications that occur after a biopsy are rare and antibiotic treatment is performed to prevent possible infection.
- the pathologist then examines the biopsies by histopathological examination in order to establish or not the presence of cancer cells and / or by immunohistochemical examination to study the expression of the desired RM6P-CI marker.
- anti-RM6P-CI IgY 415" or more simply “IgY 415" in what follows, is used to measure the levels of expression of RM6P-CI in human prostate tissues.
- RM6P-CI is specifically directed against the human RM6P-CI 18 receptor.
- the specificity of this antibody for the RM6P-CI receptor has been previously demonstrated by immunohistochemical studies in breast cancers 19 .
- Prostatic tissue expression analysis was performed by immunohistochemical staining of RM6P-CI on eight TMA slides from the pathology department ofière University Hospital (Dr. Catherine Mazerolles). Each of these slides has 16 prostate cancerous or healthy specimens belonging to 8 different patients (2 samples per patient).
- the tissues are dewaxed, rehydrated and then treated with pronase at 0.1% in phosphate saline (PBS) for 10 min at 37 ° C. Between each step the samples are washed with a solution of PBS-Tween 20 0.1%. Endogenous peroxidases are blocked by a solution of hydrogen peroxide 1% for 15 minutes. The slides are then incubated for 30 minutes at 37 ° C. with a solution of PBS + Gamma Globulin Bovine (BGG) 0.5% + goat serum diluted 1/40 to saturate non-specific sites. The primary IgY 415 antibody is diluted to 1/1800 in PBS + 0.5% BGG solution and incubated on tissues overnight at 4 ° C.
- PBS phosphate saline
- IgY 415 antibodies bound specifically to RM6P-CI are revealed using a polyclonal anti-chicken secondary antibody made in rabbits and coupled to peroxidase
- the cell nuclei are thus stained in blue / violet by hematoxylin and are symbolized in FIG. 2 by hollow arrows.
- the overexpression of the RM6P-CI is indicated by the brown coloring and is symbolized in Figure 2 by solid arrows.
- the slides were scanned with Nanozoomer-XR (Hamamatsu) and the immunohistochemical staining of RM6P-CI was analyzed.
- results are expressed as a function of the percentage of stained cells and the type of staining (perinuclear or dispersed in the cytoplasm),
- the tissue analyzed is considered positive (the cancerous tissue) if more than 10% of the cells are stained brown.
- Non-cancer samples include 39 normal and 2 benign hypertrophic tissues.
- Each sample was both analyzed by a pathologis to determine the Gleason scores corresponding to the severity of the cancer and immunostained using an anti-M6PR antibody (IgY 145 antibody).
- the cell nuclei were stained with hematoxylin.
- Figure 1 illustrates the expression patterns of the RM6P-CI receptor in three different prostate cancers (Fig 1a) and in three healthy prostate tissues (Fig 1b).
- the difference in immunohistochemical staining of RM6P-CI between healthy and cancerous tissues is very important at this magnification. In healthy tissues, only the labeling of nuclei with hematoxylin is visible.
- Figure 2 shows at a high magnification the characteristics of immunohistochemical staining by the anti-RM6P-CI antibody.
- Prostate cancerous tissues are differentially labeled since staining of prostate cancer tissues indicated two strong types of labeling (two expression patterns) considered positive (Fig 2a and 2b).
- the first type of staining observed in 23% of the samples, is granular and perinuclear. This coloration is the vector (Fig. 2a) and is generally observed in normal tissues rich in RM6P The '14' l3.
- the second type of staining observed in 61% of the samples, is also granular but more diffused in the cytoplasm of the cell (Fig. 2b).
- Table 1 below shows the percentage of labeled cells in cancerous and healthy prostate tissues.
- labeled cells As a reminder, a higher level of 10% of labeled cells was set by the inventors as an indicator of prostate cancer tissue.
- the labeled cells are also designated by "labeled RM6P-CI cells” or "colored RM6P-CI cells”.
- prostate cancer samples Of 126 prostate cancer samples, a total of 106 samples - 84% prostate cancer samples - have more than 10% of labeled cells. Of 31% prostate cancer samples, more than 60% of the cells are labeled. In contrast, of the 41 healthy samples, less than 3% of the cells are labeled.
- Table 2 shows the overexpression of the RM6P-CI receptor (% RM6P-CI positive) in 126 prostate cancer samples according to Gleason grade.
- % RM6P-CI positive indicates that the percentage of samples having a labeled cell level for the RM6P-CI is greater than 10%.
- the gravity and the risk of progression of prostate cancers are estimated thanks to the Gleason grade, also called Gleason score (score ranging from 2 to 10), taking into account the change in the morphology of the prostatic glands towards an increasing lack of differentiation.
- Gleason grade also called Gleason score (score ranging from 2 to 10)
- RM6P-CI Immunohistochemical staining of RM6P-CI according to Gleason scores indicates that RM6P-CI is overexpressed (positive staining) for both low grade cancer (such as Grade 4) and high cancer grades
- Prostate cancer tissue samples provided by Dr. Xavier Rébillard (Clinique Beausoleil, Montpellier), were fixed with 4% paraformaldehyde, paraffin-embedded and cut with Leica microtome (Leica Biosystems) in 5 ⁇ thick sections. Two consecutive sections of the same sample were used. The labeling protocol remains identical but the IgY 415 antibody (1/1000) is incubated beforehand for 90 min at 37 ° C. with a solution of highly concentrated RM6P-Cl (1.24 mg / ml) in PBS or with a solution of PBS containing 1.24 mg / ml of bovine gamma globulin (control).
- Biopsies are derived from prostatectomies performed for the treatment of advanced cancers.
- the tissue removed is frozen at -80 ° C. and then fixed by incubation for 20 seconds in methanol at a temperature of -20 ° C.
- the frozen sections of 6 ⁇ are prepared and incubated for 30 min at room temperature with the antibodies (dilution 1/300) in the phosphate buffer.
- the level of expression of the RM6P-CI was measured using a computerized image analyzer (SAMBA, Alcatel Grenoble France) according to the method described in Berthe 19 .
- Non-specific staining is evaluated using an identical concentration of IgY antibody from a non-immunized animal (negative control).
- Table 3 describes the level of expression of RM6P-CI in frozen sections of 5 samples according to the determination of the "QIC score" with the RM6P IgY 415 antibody or the control antibody (non-specific).
- immunohistochemical staining is 3.4 to 5 times higher than that of normal tissues.
- the cancer marking obtained with the anti-RM6P-CI antibody is specific because it is 4.75 to 6 times higher than that obtained for the same concentration of a non-specific IgY antibody.
- the immunohistochemistry assay can therefore be performed on freezing sections of the prostatic tissue.
- This type of cut advantageously makes it possible to establish a rapid diagnosis (early) after the sampling by the clinician.
- an "extemporaneous" diagnosis is thus available immediately after the removal of prostate tissue from a subject to be diagnosed.
- RM6P-CI has previously been observed in isolated cancer cell lines in culture, including in a prostate cancer line 16 . It has been shown in Huang et al. 16 that the prostate cancer cell line LNCaP expressed RM6P-CI, while other prostate cancer cell lines PC-3 and DU-145 do not express little or RM6P IT.
- a cell line is an artificial system subject to culture artifacts, such as the presence of fetal calf serum essential for the survival of the cell line, and therefore the results. obtained with a cell line can not be generalized even more if the results obtained with other comparable cell lines are different.
- the RM6P-CI was considered a tumor suppressor gene since many studies have described a decrease in the expression of RM6P-CI in several types of cancers.
- PSA prognostic marker
- RM6P-CI overexpression of RM6P-CI in cancerous prostate tissue makes it possible to envisage the use of said RM6P-CI as a diagnostic tool for the detection of prostate cancer by anatomopathologists.
- RM6P-CI RM6P-CI
- This new marker RM6P-CI screening and diagnosis of prostate cancer according to the invention therefore advantageously to overcome the deficiencies and limitations of current diagnostic tools.
- the present invention provides a specific marker for prostate tumor cells since RM6P-CI is overexpressed only in prostate cancer cells (and not in healthy prostate tissue).
- the present invention further provides a novel cancer cell marker that can be measured on prostatic tissue in situ in the patient by methods using optical fiber or nanoparticle biosensors.
- the method of the invention may further comprise, in addition to measuring the level of expression of the RM6P-CI gene, measuring the level of expression of one or more immunohistochemical markers known to date.
- immunohistochemical markers mention may be made of markers of basal type cells (also called "basal type markers"), chosen in particular from p63, CK 903 or CK 5/6, or other cell markers. cancerous, especially selected from AMACR ® , GST1 methylated ® or TMPRSS2-ETS ® .
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Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR1450588A FR3016638B1 (fr) | 2014-01-23 | 2014-01-23 | Nouvelle methode de depistage du cancer de la prostate |
| PCT/FR2015/050153 WO2015110759A1 (fr) | 2014-01-23 | 2015-01-22 | Nouvelle méthode de dépistage du cancer de la prostate |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP3097209A1 true EP3097209A1 (fr) | 2016-11-30 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP15704352.2A Withdrawn EP3097209A1 (fr) | 2014-01-23 | 2015-01-22 | Nouvelle méthode de dépistage du cancer de la prostate |
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| Country | Link |
|---|---|
| US (1) | US20170029898A1 (fr) |
| EP (1) | EP3097209A1 (fr) |
| FR (1) | FR3016638B1 (fr) |
| WO (1) | WO2015110759A1 (fr) |
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|---|---|---|---|---|
| FR3041345B1 (fr) | 2015-09-18 | 2019-06-14 | Nanomedsyn | Composes polysaccharides multi-fonctionnalises et leur utilisation pour cibler le recepteur du mannose 6-phosphate cation-independant |
| US10363159B1 (en) | 2018-08-24 | 2019-07-30 | Outcome-Based Technologies LLC | Pain management and post-operative hip orthosis |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2001060860A2 (fr) * | 2000-02-17 | 2001-08-23 | Millennium Predictive Medicine, Inc. | Genes, compositions, kits, et procedes d'identification, d'evaluation, de prevention, et de traitement du cancer de la prostate |
| CA2676436A1 (fr) * | 2007-01-23 | 2008-07-31 | Centre National De La Recherche Scientifique (Cnrs) | Diagnostic du cancer de la prostate |
-
2014
- 2014-01-23 FR FR1450588A patent/FR3016638B1/fr active Active
-
2015
- 2015-01-22 EP EP15704352.2A patent/EP3097209A1/fr not_active Withdrawn
- 2015-01-22 US US15/113,281 patent/US20170029898A1/en not_active Abandoned
- 2015-01-22 WO PCT/FR2015/050153 patent/WO2015110759A1/fr not_active Ceased
Non-Patent Citations (2)
| Title |
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| None * |
| See also references of WO2015110759A1 * |
Also Published As
| Publication number | Publication date |
|---|---|
| US20170029898A1 (en) | 2017-02-02 |
| WO2015110759A1 (fr) | 2015-07-30 |
| FR3016638A1 (fr) | 2015-07-24 |
| FR3016638B1 (fr) | 2018-04-13 |
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