This is the § 371 U.S. National Stage of International Application No. PCT/EP2016/072723, filed Sep. 23, 2016, which was published in English under PCT Article 21(2), which in turn claims the benefit of ES Application No. P201531360, filed Sep. 23, 2015, which is incorporated herein in its entirety.
The present invention relates to means of prognostication in renal cancer of the clear cell renal carcinoma type. More particularly, the invention relates to prognostication in this type of cancer for determining the risk of relapse, employing a group of 9 RNA molecules (also referred to as “microRNAs” or “miRNAs”).
Clear cell renal carcinoma (CCRC) has an incidence of 11 cases per 100,000 persons, with a specific cancer mortality of ca. 35%.
In recent years, various drugs have demonstrated clinical utility in CCRC (stages III and IV), and some of these (such as sunitinib, sorafenib, everolimus, axitinib, and temsirolimus) have received approval for use in treating metastatic cancer in distinct therapeutic lines. The impact of these drugs on the natural history of advanced CCRC has led to initiation of numerous clinical trials to assess whether their use in adjuvant therapy can offer a benefit to patients. Most of these trials were focused on high risk populations (stages and high risk patients with stage II), but current parameters are inadequate to identify the patients at high risk for relapse.
In moderate stages of the disease (stages I and II), current treatment consists of complete excision of the tumor; also, recently some alternatives have been developed which involve ablative therapies in situ. In moderate stages, drugs are not employed as an adjuvant therapy. CCRC in moderate stages has an overall relapse rate of ca. 15%, and accordingly more than 85% of patients with localized stages will not benefit from adjuvant therapy.
WO2011039757A2 describes prognosis of CCRC with the use of miRNAs as markers. In that document, the miRNA hsa-miR-204 is described.
That document does not disclose the group comprising 9 miRNAs according to the present invention, and does not disclose a prognostic method which allows one to identify the risk of relapse of CCRC.
WO2010145035A1 describes the use of some of the miRNAs according to the present invention as markers for renal cancer of the CCRC type.
That document does not disclose the group comprising 9 miRNAs according to the present invention, and does not disclose a prognostic method which allows one to identify the risk of relapse of CCRC.
WO2013026684A1 discloses a prognostic and diagnostic method for renal cancer of the CCRC type which utilizes the expression profile of at least two miRNAs of a long list of miRNAs (FIG. 7 of WO2013026684A1).
That document describes the 9 miRNAs according to the present invention, but not a group of 9 miRNAs. Further, that document does not disclose a prognostic method which allows one to identify the risk of relapse of CCRC, and does not provide grounds for use of a group of the 9 miRNAs according to the present invention in a prognostic method which allows one to identify the risk of relapse of CCRC.
None of the three documents cited provides any grounds for devising the invention as set forth in the claims.
The cited documents, individually and in combination, do not suggest the claimed matter.
The objective technical problem of the invention in relation to the closest state of the art may be defined as that of devising a prognostic method to determine the risk of relapse of renal cancer of the CCRC type in stages I and II of the disease.
This problem is solved by a prognostic method for determining the risk of relapse of renal cancer of the CCRC type in localized stages I and II of the disease, as said method is set forth in the claims of the present application.
In a first aspect, the present invention provides prognostic method for determining the risk of relapse of renal cancer of the clear cell renal carcinoma type, stages I and II, in a human subject; comprising:
This prognostic method enables identification of a high risk population for relapse, in localized stages of the disease (CCRC in stages I and II), whereby one can offer adjuvant treatment only to patients who require it.
According to another embodiment in connection with the first aspect of the invention, the level of expression is determined with the use of microarrays of microRNAs.
In a second aspect, the present invention provides a prognostic and treatment method for determining the risk of relapse of renal cancer of the clear cell renal carcinoma type, stages I and II, in a human subject and subsequently treating said subject, the method comprising:
According to another embodiment in connection with the fourth aspect of the invention, the kit is comprised of a microarray of microRNAs or probes for microRNAs.
In some cases, at least 30%, 40%, 50%, 60%, 70%, 80% or at least 90% of the microRNAs, or probes thereto, present on said at least one microarray are selected from the group consisting of: hsa-miR-223, hsa-miR-103, hsa-miR-107, hsa-miR-425, hsa-miR-340, hsa-miR-130b, hsa-miR-652, hsa-miR-214, and hsa-miR-204. In this way the microarray may be enriched for those miRNAs or probes thereto that are informative for the prognostic and related methods of the present invention. Being enriched for informative miRNAs addresses a problem with commercially available miRNA microarrays that interrogate many thousands of different miRNAs most of which will not be informative for prognosis of CCRC relapse, the efficiency of which may be sub-optimal for carrying out the prognostic methods of the present invention.
It is further specified that the miRNAs correspond to each of the sequences in the following list of sequences:
The Sequence Listing is submitted as an ASCII text file in the form of the file named Sequence_Listing.txt, which was created on Mar. 20, 2018, and is 2213 bytes, which is incorporated by reference herein.
Below, a transcription of the free text which appears in the list of sequences is provided:
The present invention includes the combination of the aspects and preferred features described except where such a combination is clearly impermissible or is stated to be expressly avoided. These and further aspects and embodiments of the invention are described in further detail below and with reference to the accompanying examples and figures.
An observational study was carried out which included all of the radical and partial nephrectomies performed at “October 12” University Hospital, of Madrid, between the year 1999 and 2008.
All patients who underwent radical or partial nephrectomies, open or laparoscopic, between 1999 and 2008, were included in the study.
For the staging, the TNM system was employed, which is the most commonly accepted classification. This classification was last modified in 2010.
Grouping into stages TNM:
Of a total of 164 patients, 71 were selected who met the following criteria:
The tumor pieces from the nephrectomy were fixed in formalin; in particular, after a piece from a partial or radical nephrectomy was received, it was weighed, measured, and fixed by immersion in formaldehyde (10% formalin) for 24-48 hours.
Subsequently, the piece was included in paraffin, in an automatic tissue processor.
Then the piece was cut, and RNA was extracted, from the tumor samples fixed in formalin and embedded in paraffin.
The samples were hybridized with microarrays of human miRNA, version 14.0, 8×15K (Agilent Technologies), according to the manufacturer's protocol.
A level of statistical significance was calculated for each miRNA based on a Cox regression model (Shu, Y., Klein, J. P., and Zhang, M-J., 2007, Asymptotic theory for the Cox semi-Markov illness-death model. Lifetime Data Anal., March; 13(1):91-117), with the objective of ascertaining a profile of miRNAs the expression of which bears a significant relation to survival free from the disease. The miRNAs related to disease free survival were “filtered” based on their p values. Micro RNAs (miRNAs) showing a p value <0.01 were used to develop prediction models of the risk of relapse, using the method of supervised principal components. Additionally, the correlation between the miRNAs selected was evaluated, in order to establish correlation groups so as to be able find reduced profiles. Cross-validation was employed to evaluate the exactitude of prediction of the profiles. The cut-off point was established a priori; and, to test the statistical significance, the value of p in the log rank test for the risk groups was evaluated, using 10,000 aleatory permutations.
A prediction model for progression in patients with CCRC diagnosed in stages I and II (RCC-9miR score) was generated. This model is comprised of the expression of the nine miRNAs (Table 2). The prediction score is calculated by the following formula:
Σiwixi−2,896,583,
where wi is the weight, and xi is the expression value of the microRNA i.
The result of the formula is a value which depends on the levels of expression of the microRNAs hsa-miR-223, hsa-miR-103, hsa-miR-107, hsa-miR-425, hsa-miR-340, hsa-miR-130b, hsa-miR-652, hsa-miR-214, and hsa-miR-204, having sequences identified by the sequences SEQ ID NO: 1-9.
Table 3 illustrates the association between the miRNA profile and progression of the disease. The association of the miRNA profile with progression of the disease is statistically significant, with p=0.0001.
Patients with a score greater than 0.954 are regarded as high risk. The model assessed 30% of the patients as high risk. The 5-year disease-free survival (DFS) was 93.9% for low risk patients and 61.54 for high risk patients (hazard ratio HR=12.1, p=0.0001) (confidence interval CI=3.012-37.92). These difference in the long-rank test were validated with 10,000 permutations (p>0.0013). The 5-year cancer-specific survival was 95.7% for the low risk group and 86.4% for the high risk group ((HR=7.7, p=0.0084) (CI=1.687-35.14).
The 9-miRNA predictor is an excellent predictor of progression of the disease. The 9-miRNA predictor has been used as a predictive factor, and is statistically significant (p=0.023, HR=6.55, 95% CI=1.29=33.165) in the analysis of cancer-specific survival (CSS).
All references cited herein are incorporated herein by reference in their entirety and for all purposes to the same extent as if each individual publication or patent or patent application was specifically and individually indicated to be incorporated by reference in its entirety.
The specific embodiments described herein are offered by way of example, not by way of limitation. Any sub-titles herein are included for convenience only, and are not to be construed as limiting the disclosure in any way.
Number | Date | Country | Kind |
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ES201531360 | Sep 2015 | ES | national |
Filing Document | Filing Date | Country | Kind |
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PCT/EP2016/072723 | 9/23/2016 | WO | 00 |
Publishing Document | Publishing Date | Country | Kind |
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WO2017/050985 | 3/30/2017 | WO | A |
Number | Name | Date | Kind |
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20120108466 | Wu et al. | May 2012 | A1 |
Number | Date | Country |
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WO 2010145035 | Dec 2010 | WO |
WO 2011039757 | Apr 2011 | WO |
WO 2013026684 | Feb 2013 | WO |
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Number | Date | Country | |
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20180346990 A1 | Dec 2018 | US |