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Determination of the Prevalence of Microsatellite Instability, BRAF and KRAS/NRAS Mutation Status in Patients with Colorectal Cancer in Slovakia.

Author(s): Tomas Rendek (corresponding author) [1,*]; Rami Saade [2]; Ondrej Pos [3,4]; Georgina Kolnikova [5]; Monika Urbanova [5]; Jaroslav Budis [3,4]; Luboslav Mihok [6]; Miroslav Tomas [7]; Tomas Szemes [3,4]; Vanda Repiska [1]

1. Introduction

Slovakia is one of the countries with the highest incidence of colorectal cancer (CRC), mounting at 43.9 cases per 100,000 residents, which accounts for 15.9% of all new cancer cases, based on the 2020 WHO International Agency for Research on Cancer [1,2]. Due to its high socioeconomic burden, studying individual cases of CRC in the Slovak Republic is imperative. In recent years, local research groups have been assessing the effectiveness of national screening programs for CRC, utilizing fecal immunochemical tests (FIT) on simulated population models. [3] Moreover, local researchers aimed to repurpose local prenatal screening data to identify genetic variants associated with colorectal cancer, focusing on genes associated with Lynch syndrome as the most common germline mutations associated with the development of CRC. [4] A recently published joinpoint analysis of local CRC trends showed only slight improvement in reduced mortality (0.9%) in the follow-up period from 2001 to 2018 compared to the previous period from 1971 to 2001, limited to the age group from 29 to 45 years old [5]. Due to the lack of improvement in CRC prevalence, the identification of possible driver mechanisms can help to elucidate the high incidence as well as mortality of CRC in Slovakia, as the underlying cause of this problem is still unclear, with a limited number of regional studies being conducted [4].

CRC can arise by either one or a combination of three mechanisms: chromosomal instability, microsatellite instability (MSI), or CpG island methylator phenotype (CIMP) [6]. Chromosomal instability is considered to be the most prevalent mechanism, responsible for 60–70% of sporadic CRC cases, where chromosomal imbalance resulting in aneuploidy and loss of heterozygosity in somatic cells leads to cancer development [7]. In CIMP tumors, the methylation of CpG islands within the promoter region leads to the transcriptional silencing of genes that play a role in tumor suppression or are involved in cell cycle regulation [7,8]. The exact definition of CIMP tumors varies across the literature, with methylation status of 5 loci: hMLH1, p16, MINT1, MINT2, and MINT31 being usually investigated [7,8]. MSI is a phenomenon followed by the deactivation of one or more mismatch repair (MMR) genes due to their mutation or epimutation, which maintains genome integrity by repairing errors emerging from DNA replication [9]. A substantial portion of CRCs, especially in early-onset cases, can arise due to hereditary disorders characterized by germline mutations in associated genes. The underlying mechanisms of early-onset CRC cases have been extensively studied in connection with hereditary syndromes, mainly familial adenomatous polyposis and hereditary nonpolyposis colorectal cancer, also known as Lynch syndrome (LS) [10]. Microsatellites also called short repetitive repeats, consist of repeating sequences of 1–6 nucleotides. The characteristics of their distribution are variable from 15 to 65 tandem nucleotide repeats of small satellite DNA located mainly at the ends of chromosomes. Microsatellites are widely distributed and can often also be found in the vicinity of exons or introns [11]. The mechanism of microsatellite formation can generally be attributed to errors of DNA polymerase during replication, where redundant repeats of a certain sequence may be formed, or, conversely, a certain number of repeats may be lost compared to the template strand. Normally, such errors are repaired by the MMR mechanism, but in case of its failure, such new variants are preserved, contributing to the accumulation of mutations in the affected cells and significantly impacting their transformation and subsequent progression into cancer cells [12]. Depending on the degree and frequency of MSI, it can be divided into three categories: high microsatellite instability (MSI-H), low microsatellite instability (MSI-L), and microsatellite stability (MSS) [13]. In recent studies, MSI-L and MSS are classified into the same category as MSS [14]. MMR mechanism, which is responsible for sustaining genome stability [14,15], consists of the following genes: MLH1, MSH2, MSH6, and PMS2, which have proven to hold a high clinical significance for MSI and genetic predisposition for CRC and PMS1 and MLH3 with less clear significance in CRC development [16].

Proto-oncogene BRAF is a potent modulator of the signaling pathway known as Ras/Raf/MEK/ERK [17]. BRAF V600E has been studied as a driver mutation associated with the development of CRC [18]. Alterations in the BRAF gene seem to occur early in CIMP tumors. The specific BRAF V600E mutation shows a significant association with MLH1 promoter hypermethylation and is present in approximately 20.3% of cases involving CRC [19]. BRAF mutation is believed to be responsible for the failure of anti-EGFR (epidermal growth factor receptor) therapy in approximately 10–15% of cases [17] and is also valuable as a negative prognostic factor, especially in metastatic and MMR deficient CRCs [20]. RAS proteins function as compact GTPases, serving as molecular switches for relaying signals from activated receptors. They accomplish this by transitioning between an inactive state bound to GDP and an active state bound to GTP. In its GTP-bound state, RAS can interact with and activate various downstream effector proteins, leading to a variety of cellular responses such as cell proliferation, survival, differentiation, and potential neoplastic transformation [21]. Approximately 30% of human cancers, comprising both solid tumors and hematologic malignancies, are connected to alterations in RAS genes. Interestingly, mutations in distinct RAS isoforms show a predisposition to different types of cancer affecting various organs [22]. KRAS mutation status is imperative for identifying patients who would benefit from anti-EGFR therapy, making it one of the prime examples of predictive biomarkers for personalized cancer treatment [23]. The prognostic value of KRAS mutations is more unclear, with studies suggesting worse outcomes for patients carrying mutations in codons 12 and 61 [24]. Mutations of NRAS have a much lower incidence than KRAS or BRAF, as they are identified in approximately 2–4% of CRCs. Thus, the reason why the roles of NRAS mutations as prognostic and predictive markers in metastatic CRCs were much less investigated. A meta-analysis of CRC outcomes concluded that patients carrying NRAS mutations have an overall worse progression-free survival rate [25].

Accurate identification of abnormalities in the KRAS, NRAS, and BRAF genes holds significant importance for the appropriate assessment of CRC treatment by anti-EGFR monoclonal antibodies [26]. The concomitant KRAS and BRAF mutations occur rarely in CRCs. It is also uncommon practice to test already KRAS-positive patients for BRAF mutation; hence, this occurrence is usually identified only in clinical studies [27]. Even in larger studies, the existence of KRAS and BRAF appear to be mutually exclusive [28]. In our retrospective study, we aim to assess the prevalence of the mentioned driver mutations in CRC patients, along with other clinical factors, and compare their prevalence with global data. This study also aims to support any follow-up research on the high morbidity and mortality of CRC patients in Slovakia.

2. Materials and Methods

2.1. Ethical Approval

Here, we provide a retrospective cohort study, analyzing 83 patient records collected by the Department of Pathology of the National Cancer Institute in Bratislava, Slovak Republic, between 2020 and 2022—all included patients undergoing routine diagnostic testing signed informed consent. The study was approved by the Ethics Committee of the National Oncology Institute in Bratislava, protocol code: PATOL-01.

2.2. Cohort Specification

The following criteria were used to specify the cohort of patients for whom genetic testing was requested: (I) a patient with histopathological confirmation of CRC diagnosis categorized by the International Classification of Diseases 10th Revision (ICD-10) as summarized in Table 1; (II) a failure of MMR protein expression proven by immunohistochemical (IHC) analysis, or if the staining result was inconclusive; (III) patient undergoes genetic testing for MSI status; (IV) patient undergoes BRAF, NRAS, and KRAS genetic examination.

2.3. Sample Preparation

The tumor samples were collected either as part of a tissue biopsy examination or tissue resection during a curative surgical procedure. Tumor tissue was processed for formalin fixation and paraffin embedding (FFPE) at the Department of Pathological Anatomy of NCI. The indicated CRC samples were sent for examination of MSI status as well as the genetic examination of BRAF and KRAS/NRAS mutations at the Department of Medical Genetics, NCI. The DNA isolation from FFPE samples was performed according to standardized procedures in clinical genetics laboratories.

2.4. Detection of Microsatellite Instability

For identification of microsatellite unstable tumor tissues, 5 mononucleotide microsatellite markers were used: NR-21, BAT-26, BAT-25, NR-24, and MONO-27, followed by fragmentation analysis on ABI PRISM 3130 genetic analyzer. Alternatively, MSI status was investigated with Idylla™ MSI Assay on the Biocartis Idylla™ System platform. Both assays are standard methods for MSI detection at the Department of Medical Genetics, NCI.

2.5. Identification of BRAF and KRAS/NRAS Mutations

Evidence of the BRAF gene’s most prevalent mutations, V600E and V600K, respectively, were obtained using allele-specific PCR with the Cobas Z 480 PCR system (Roche Molecular Diagnostics, Pleasanton, CA, USA). The status of RAS genes was investigated on the Roche LightCycler 480 platform (Roche Molecular Diagnostics) using the RAS kit Mutation Screening Panel CE-IVD (Entrogen, Woodland Hills, CA, USA), targeting KRAS and NRAS genes (codons 12/13, 59/61, 117/146).

3. Results

In total, we searched through approximately 3500 requests for genetic testing for the years 2020–2022, of which 83 patients met our criteria. The detailed profile of each of the enrolled patients in our study is provided in Supplementary Table S1. We summarize the results of the MSI status, BRAF, KRAS, and NRAS genes and the results of the IHC examination of MMR protein expression in tumor tissue in Table 2.

Overall, four patients with MSI-H status of their tumor tissue samples were identified, making up 4.8% of cases from the studied group. Identified MSI-H samples were investigated for MMR gene expression status through IHC. The results of the MMR expression status are summarized in Table 3.

A better visualization of all patient parameters, along with mutation status, is provided in the plot (Figure 1).

The age of patients in our study varied from 26 to 86 years, with an average of 62.5 years. The median age for males and females was 61.81 and 63.24 years, respectively. The male population was slightly larger, accounting for 55.42% of the studied group. The distribution of patients into age groups according to their gender is visualized in Figure 2.

4. Discussion

We searched the NCI database of genetic testing applications of CRC-confirmed patients between 2020 and 2022. It is worth mentioning that based on our criteria described in the chapter Methods, we were able to select only 83 patients from approximately 3500 applications for MSI testing. The possible reasons for this might be the fact that in clinical practice, the occurrence of RAS and BRAF mutations are often seen as mutually exclusive; thus, after identification of one mutated driver gene, the mutation status of the latter will not be investigated, despite having a clinical significance [29]. This also posed the biggest limitation for our study, narrowing down our cohort to only 2.37% of patients enrolled for MSI testing. The aim of this research was to identify patients who were investigated for MSI, BRAF, and KRAS/NRAS mutational status. From the available results of the individual examinations, we summarized in Supplementary Table S1 the age and gender of the patients, the diagnosis according to ICD-10, the neoplastic cell percentage, the mutational status of KRAS, NRAS, and BRAF genes, the MSI status, and the expression status of MMR proteins based on IHC staining in MSI-H patients. However, these data may be useful in possible future investigations. Gender distribution in our study cannot be correlated with the gender distribution of CRC incidence in Slovakia due to applied selection criteria, which do not reflect the total number of newly diagnosed cases by gender. Based on GLOBOCAN data, an almost 2-fold higher incidence in male patients than females was to be expected [30]. The age of patients in our cohort ranged from 26 to 86 years, with a median age of 62.5 years and a median age for males and females of 61.81 and 63.24 years, respectively. Up to 66.3% of the patients were older than 60, which aligns with literature describing the late onset of sporadic CRC in developed countries [31].

The importance of screening for genes encoding RAS proteins, specifically KRAS and NRAS, lies primarily in the selection of appropriate chemotherapy [32]. Mutations in the KRAS gene occur independently of MMR status; however, a higher incidence of KRAS mutations has been linked to mutations in the MSH2 and MSH6 genes, where it is implicated in the more rapid progression of carcinogenesis [33]. A direct association between hereditary forms of colorectal cancer and RAS gene mutations has not been demonstrated, but simultaneous mutation of both groups of genes is of major prognostic and therapeutic importance. In our patient cohort, the mutation in the RAS gene was detected in 39 patients (47%), from which KRAS mutation was detected in 33 (39.8%) patients, and NRAS gene mutation in 6 (7.2%) patients. Our results are in accordance with the global prevalence of RAS family mutation prevalence in CRC, as noted in clinical trials meta-analysis by Sorich [34] and an analysis of U.S. population prevalence [35]; both prevalences were approximately 50%. Detection of the BRAF gene mutation, specifically V600E, is a useful marker to differentiate sporadic and hereditary forms of MMR deficiency because of its close association with MLH1 promoter hypermethylation, which is responsible for approximately 70% of sporadic forms of MMR-deficient CRC. The BRAF V600E mutation was detected in 9 (4.6%) patients; thus, the hereditary background of the disease (LS) can almost certainly be ruled out in these patients [32]. BRAF mutation prevalence in our cohort was similar to the prevalence of RAS family mutations in accordance with global prevalence. An examination of MSI status is a crucial factor that indicates the state of function of the MMR machinery in the cell. However, MSI examination alone does not serve to differentiate hereditary from sporadic forms of MMR deficiency, which has predictive and prognostic value for the patient’s family members in addition to its prognostic value for the patient. However, in the case of MSS tumors, the LS can be ruled out [14]. According to the literature, microsatellite instability is present in approximately 15% of colorectal cancers, while the majority of cases are caused by somatic MLH1 promoter hypermethylation compared to MSI caused by LS [36]. In the case of positive MMR protein expression, according to the literature, there is a low probability of MSI-H in tumor tissue. However, the sensitivity and specificity of IHC analysis of MMR protein expression are greatly influenced by the quantity and quality of the material as well as the pathologist’s experience. The quality of the sample obtained for tumor testing can be ascertained by the percentage of neoplastic cells (NCP). Low NCP (patients 12, 61, 69) might suggest that the sample contains a major proportion of healthy tissue instead of the tumor the biopsy was targeted for, which can lead to a false negative test [37]. The major limitation in methods lies in the IHC analysis of MMR protein expression. In certain cases, there may be a discordance between the results of the IHC analysis of MMR proteins and the PCR examination of MSI status [38]. In such a case, both examinations should be repeated if the quantity and quality of the archived material permit. In our case, we were able to detect a loss of expression of at least one of the MMR proteins in all patients with MSI-H status. We summarize the results of the IHC examination of MMR proteins and MSI status in Table 2. Only four of these patients were detected to have MSI-H status with a confirmed knockout of expression of MMR proteins, and all of them were older than 60 years of age. In addition, 2 of them (50%) had a mutation in the BRAF gene. Three patients were aged less than 60 years, specifically 33, 44, and 45 years, but the former had a positive MMR protein expression, and the remaining two patients were missing the results of BRAF gene testing and MMR protein expression analysis. According to the literature, KRAS mutations occur in 35% to 45% of CRC, mostly in codon 12 (80%), c.35 G > A (G12D), and c.35 G > T (G12V) transversions, representing 32.5% of KRAS mutations [39]. In our research, 39.75% of patients were positive for KRAS mutation, which is similar to the percentage reported in the literature.

The co-occurrence of BRAF and KRAS mutation in patient number 35 was a unique phenomenon, emerging in about 0.001% of CRC cases [27], and is scarcely discussed in the available literature, mostly through case reports of individual patients. For example, such mutation co-occurrence was discovered even within one cancer cell during a single-cell sequencing study conducted by Gularte-Merida et al., indicating that dual-driver mutations are present in a rare subgroup of CRCs [40]. This co-occurrence also supports the hypothesis of two clonal origins of CRC in this particular patient, as was the case in another case study [27]. The co-occurrence of BRAF and KRAS mutation also has predictive value, apart from prognostic. Patients with advanced CRC with wild-type RAS are eligible for cetuximab or panitumumab, whereas patients with BRAF p.V600E–mutant CRC are eligible for combination therapy with encorafenib and cetuximab. [41]. In current discussions, there is a suggestion that addressing multiple RAS mutations in colorectal cancer (CRC) may require treating them as distinct primary conditions, as they might evolve separately in parallel evolutionary pathways and be present in lower copy numbers even before the administration of treatment, as was shown in primary melanoma study [42]. In our study, KRAS and BRAF co-occurrence was accompanied by MSI-H status. This is confirmed by research in other countries, such as the team of Rodrigo Gularte-Mérida, where the co-occurrence of KRAS and BRAF mutation is reported in MSI-H tumors exclusively [40]. The presence of BRAF mutation in colorectal cancer is by itself a negative prognostic factor, as therapeutic strategies utilizing medications aimed at BRAF-V600E in CRC have shown comparatively lesser efficacy than, for example, in BRAF mutant melanoma. Specifically, BRAF-V600E inhibitor monotherapy has yielded an overall response rate of around 5% [43]. In addition, KRAS mutation has additional adverse effects and is reported to significantly increase disease progress in such patients [43,44,45,46]. On the other hand, prognostic and predictive value in MS status is less clear. In general, patients with microsatellite unstable tumors in stage II colorectal cancer have an overall more favorable prognosis [47]. In later stages, the overall prognostic value of MS status was less clear, and MS-instable patients did not receive any benefit from adjuvant chemotherapy by 5-Fluorouracyl in 5-year survival compared to patients with MS-stable tumors [48]. There are published meta-analyses, notably by Wang et al., which are also disputing the prognostic value of MSI status for advanced stages of colorectal cancer [49]

5. Conclusions

MSI testing plays a crucial role in categorizing CRC tumors into MSI-H and microsatellite stable types. Among all CRCs, MSI-H or MMR-deficient tumors have displayed the most favorable prognosis, making MSI testing a valuable prognostic marker. Additionally, it aids in identifying LS among familial CRC patients. A diagnostic mutation in the BRAF gene (V600E) can potentially distinguish sporadic from hereditary CRCs, as it aligns with sporadic cases. While some earlier studies highlighted the predictive role of MSI testing in chemotherapy, recent research has presented conflicting results, leading many authors to refrain from recommending it as a routine examination for assessing therapeutic response.

The prevalence of main driver mutations of CRC in our study was in alignment with globally published literature; however, the size of the studied cohort was limited due to the small number of patients undergoing simultaneous testing for BRAF, KRAS mutation status, as well as microsatellite stability status. Nonetheless, identifying MSI along with the most common driver mutations and their co-occurrence provides a better picture of the molecular background of the high incidence of CRC in the Slovak population, strongly encouraging prospective investigation. Further research should aim for a broader cohort of patients, extended by investigation of family history, screening for Lynch syndrome-associated mutations according to Bethesda testing guidelines, and focus on therapeutic implications for the patients enrolled in future studies due to the rising burden of this disease in Slovakia and worldwide.

Author Contributions

Conceptualization, T.R. and R.S.; methodology, M.U.; investigation, G.K. and M.T.; writing—original draft preparation, T.R.; writing—review and editing, O.P. and J.B.; visualization, L.M.; supervision, V.R.; project administration, T.S. All authors have read and agreed to the published version of the manuscript.

Institutional Review Board Statement

All subjects gave their informed consent for inclusion before they participated in the study. The study was conducted in accordance with the Declaration of Helsinki, and the protocol was approved by the Ethics Committee of the National Oncology Institute in Bratislava, protocol code: PATOL-01, approved on 30 January 2024.

Informed Consent Statement

Informed consent was obtained from all subjects involved in the study.

Data Availability Statement

The original contributions presented in the study are included in the supplementary material. Further inquiries can be directed to the corresponding author.

Conflicts of Interest

Authors O.P., J.B. and T.S. are employees of Geneton Ltd. and are involved in numerous research and development efforts for adapting new technologies to better understand genomic data and facilitate their implementation in patient care. The remaining authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest.

Disclaimer/Publisher’s Note: The statements, opinions and data contained in all publications are solely those of the individual author(s) and contributor(s) and not of MDPI and/or the editor(s). MDPI and/or the editor(s) disclaim responsibility for any injury to people or property resulting from any ideas, methods, instructions or products referred to in the content.

Supplementary Materials

The following supporting information can be downloaded at: https://www.mdpi.com/article/10.3390/cancers16061128/s1, Table S1: List of all patients enrolled in the study with their respective parameters: Patient number in the study, code of diagnosis (according to ICD-10), age, gender, neoplastic cells percentage (NCP) in a tissue sample, mutation status of RAS, BRAF, and MSI status.

References

1.. Available online: https://gco.iarc.fr/today/data/factsheets/cancers/10_8_9-Colorectum-fact-sheet.pdf <date-in-citation content-type="access-date" iso-8601-date="2023-06-20">(accessed on 20 June 2023)</date-in-citation>.

2.. Available online: https://gco.iarc.fr/today/data/factsheets/populations/703-slovakia-fact-sheets.pdf <date-in-citation content-type="access-date" iso-8601-date="2023-06-28">(accessed on 28 June 2023)</date-in-citation>.

3. R. Babela; A. Orsagh; J. Ricova; I. Lansdorp-Vogelaar; M. Csanadi; H. De Koning; M. Reckova Cost-effectiveness of colorectal cancer screening in Slovakia., 2022, 31,pp. 415-421. DOI: https://doi.org/10.1097/CEJ.0000000000000727. PMID: https://www.ncbi.nlm.nih.gov/pubmed/34789653.

4. N. Forgacova; J. Gazdarica; J. Budis; J. Radvanszky; T. Szemes Repurposing non-invasive prenatal testing data: Population study of single nucleotide variants associated with colorectal cancer and Lynch syndrome., 2021, 22,p. 779. DOI: https://doi.org/10.3892/ol.2021.13040.

5. P.T. Pham; J. Pekarcikova; R. Edelstein; M. Majdan Joinpoint analysis of colorectal cancer trend in the Slovakia., 2023, 124,pp. 833-841. DOI: https://doi.org/10.4149/BLL_2023_128. PMID: https://www.ncbi.nlm.nih.gov/pubmed/37874806.

6. K. Tariq; K. Ghias Colorectal cancer carcinogenesis: A review of mechanisms., 2016, 13,pp. 120-135. DOI: https://doi.org/10.20892/j.issn.2095-3941.2015.0103. PMID: https://www.ncbi.nlm.nih.gov/pubmed/27144067.

7. M.S. Pino; D.C. Chung The chromosomal instability pathway in colon cancer., 2010, 138,pp. 2059-2072. DOI: https://doi.org/10.1053/j.gastro.2009.12.065. PMID: https://www.ncbi.nlm.nih.gov/pubmed/20420946.

8. E. Nazemalhosseini Mojarad; P.J. Kuppen; H.A. Aghdaei; M.R. Zali The CpG island methylator phenotype (CIMP) in colorectal cancer., 2013, 6,pp. 120-128. PMID: https://www.ncbi.nlm.nih.gov/pubmed/24834258.

9. T.A. Kunkel; D.A. Erie DNA mismatch repair., 2005, 74,pp. 681-710. DOI: https://doi.org/10.1146/annurev.biochem.74.082803.133243.

10. W. Al-Sukhni; M. Aronson; S. Gallinger Hereditary colorectal cancer syndromes: Familial adenomatous polyposis and lynch syndrome., 2008, 88,pp. 819-844, vii. DOI: https://doi.org/10.1016/j.suc.2008.04.012.

11. M.A. Garrido-Ramos Satellite DNA: An Evolving Topic., 2017, 8, 230. DOI: https://doi.org/10.3390/genes8090230.

12. S.S. Lower; M.P. McGurk; A.G. Clark; D.A. Barbash Satellite DNA evolution: Old ideas, new approaches., 2018, 49,pp. 70-78. DOI: https://doi.org/10.1016/j.gde.2018.03.003. PMID: https://www.ncbi.nlm.nih.gov/pubmed/29579574.

13. M. Thurin; A. Cesano; F.M. Marincola, Humana: New York, NY, USA, 2019,

14. K. Li; H. Luo; L. Huang; H. Luo; X. Zhu Microsatellite instability: A review of what the oncologist should know., 2020, 20,p. 16. DOI: https://doi.org/10.1186/s12935-019-1091-8. PMID: https://www.ncbi.nlm.nih.gov/pubmed/31956294.

15. N. Pecina-Šlaus; A. Kafka; I. Salamon; A. Bukovac Mismatch Repair Pathway, Genome Stability and Cancer., 2020, 7, 122. DOI: https://doi.org/10.3389/fmolb.2020.00122. PMID: https://www.ncbi.nlm.nih.gov/pubmed/32671096.

16. P. Peltomäki Lynch syndrome genes., 2005, 4,pp. 227-232. DOI: https://doi.org/10.1007/s10689-004-7993-0. PMID: https://www.ncbi.nlm.nih.gov/pubmed/16136382.

17. C.N. Clarke; E.S. Kopetz BRAF mutant colorectal cancer as a distinct subset of colorectal cancer: Clinical characteristics, clinical behavior, and response to targeted therapies., 2015, 6,pp. 660-667. PMID: https://www.ncbi.nlm.nih.gov/pubmed/26697199.

18. H. Rajagopalan; A. Bardelli; C. Lengauer; K.W. Kinzler; B. Vogelstein; V.E. Velculescu Tumorigenesis: RAF/RAS oncogenes and mismatch-repair status., 2002, 418,p. 934. DOI: https://doi.org/10.1038/418934a. PMID: https://www.ncbi.nlm.nih.gov/pubmed/12198537.

19. J.N. Poynter; K.D. Siegmund; D.J. Weisenberger; T.I. Long; S.N. Thibodeau; N. Lindor; J. Young; M.A. Jenkins; J.L. Hopper; J.A. Baron et al. Molecular characterization of MSI-H colorectal cancer by MLHI promoter methylation, immunohistochemistry, and mismatch repair germline mutation screening., 2008, 17,pp. 3208-3215. DOI: https://doi.org/10.1158/1055-9965.EPI-08-0512. PMID: https://www.ncbi.nlm.nih.gov/pubmed/18990764.

20. J.E. Chu; B. Johnson; L. Kugathasan; V.K. Morris; K. Raghav; L. Swanson; H.J. Lim; D.J. Renouf; S. Gill; R. Wolber et al. Population-based Screening for in Metastatic Colorectal Cancer Reveals Increased Prevalence and Poor Prognosis., 2020, 26,pp. 4599-4605. DOI: https://doi.org/10.1158/1078-0432.CCR-20-1024.

21. C. Parikh; R. Subrahmanyam; R. Ren Oncogenic NRAS, KRAS, and HRAS exhibit different leukemogenic potentials in mice., 2007, 67,pp. 7139-7146. DOI: https://doi.org/10.1158/0008-5472.CAN-07-0778.

22. I.A. Prior; P.D. Lewis; C. Mattos A comprehensive survey of Ras mutations in cancer., 2012, 72,pp. 2457-2467. DOI: https://doi.org/10.1158/0008-5472.CAN-11-2612.

23. J.-Y. Douillard; K.S. Oliner; S. Siena; J. Tabernero; R. Burkes; M. Barugel; Y. Humblet; G. Bodoky; D. Cunningham; J. Jassem et al. Panitumumab-FOLFOX4 treatment and RAS mutations in colorectal cancer., 2013, 369,pp. 1023-1034. DOI: https://doi.org/10.1056/NEJMoa1305275.

24. O. Saeed; A. Lopez-Beltran; K.W. Fisher; M. Scarpelli; R. Montironi; A. Cimadamore; F. Massari; M. Santoni; L. Cheng RAS genes in colorectal carcinoma: Pathogenesis, testing guidelines and treatment implications., 2019, 72,pp. 135-139. DOI: https://doi.org/10.1136/jclinpath-2018-205471. PMID: https://www.ncbi.nlm.nih.gov/pubmed/30425122.

25. J. Cicenas; L. Tamosaitis; K. Kvederaviciute; R. Tarvydas; G. Staniute; K. Kalyan; E. Meskinyte-Kausiliene; V. Stankevicius; M. Valius KRAS, NRAS and BRAF mutations in colorectal cancer and melanoma., 2017, 34,p. 26. DOI: https://doi.org/10.1007/s12032-016-0879-9. PMID: https://www.ncbi.nlm.nih.gov/pubmed/28074351.

26. A. Bozyk; P. Krawczyk; K. Reszka; K. Krukowska; A. Kolak; S. Mandziuk; K. Wojas-Krawczyk; R. Ramlau; J. Milanowski Correlation between, and mutations and tumor localizations in patients with primary and metastatic colorectal cancer., 2022, 18,pp. 1221-1230. PMID: https://www.ncbi.nlm.nih.gov/pubmed/36160343.

27. P. Larki; E. Gharib; M. Yaghoob Taleghani; F. Khorshidi; E. Nazemalhosseini-Mojarad; H. Asadzadeh Aghdaei Coexistence of and Mutations in Colorectal Cancer: A Case Report Supporting The Concept of Tumoral Heterogeneity., 2017, 19,pp. 113-117. PMID: https://www.ncbi.nlm.nih.gov/pubmed/28580315.

28. A.D. Roth; S. Tejpar; M. Delorenzi; P. Yan; R. Fiocca; D. Klingbiel; D. Dietrich; B. Biesmans; G. Bodoky; C. Barone et al. Prognostic role of KRAS and BRAF in stage II and III resected colon cancer: Results of the translational study on the PETACC-3, EORTC 40993, SAKK 60-00 trial., 2010, 28,pp. 466-474. DOI: https://doi.org/10.1200/JCO.2009.23.3452. PMID: https://www.ncbi.nlm.nih.gov/pubmed/20008640.

29. N. Garcia-Carbonero; J. Martinez-Useros; W. Li; A. Orta; N. Perez; C. Carames; T. Hernandez; I. Moreno; G. Serrano; J. Garcia-Foncillas KRAS and BRAF Mutations as Prognostic and Predictive Biomarkers for Standard Chemotherapy Response in Metastatic Colorectal Cancer: A Single Institutional Study., 2020, 9, 219. DOI: https://doi.org/10.3390/cells9010219. PMID: https://www.ncbi.nlm.nih.gov/pubmed/31952366.

30. Cancer Today.. Available online: https://gco.iarc.fr/today/home <date-in-citation content-type="access-date" iso-8601-date="2023-06-28">(accessed on 28 June 2023)</date-in-citation>.

31. N. Keum; E. Giovannucci Global burden of colorectal cancer: Emerging trends, risk factors and prevention strategies., 2019, 16,pp. 713-732. DOI: https://doi.org/10.1038/s41575-019-0189-8.

32. P. Peltomäki; M. Nyström; J.-P. Mecklin; T.T. Seppälä Lynch Syndrome Genetics and Clinical Implications., 2023, 164,pp. 783-799. DOI: https://doi.org/10.1053/j.gastro.2022.08.058.

33. N.C. Helderman; S.W. Bajwa-ten Broeke; H. Morreau; M. Suerink; D. Terlouw; A.S. van der Werf; T. van Wezel; M. Nielsen The diverse molecular profiles of lynch syndrome-associated colorectal cancers are (highly) dependent on underlying germline mismatch repair mutations., 2021, 163,p. 103338. DOI: https://doi.org/10.1016/j.critrevonc.2021.103338.

34. M.J. Sorich; M.D. Wiese; A. Rowland; G. Kichenadasse; R.A. McKinnon; C.S. Karapetis Extended RAS mutations and anti-EGFR monoclonal antibody survival benefit in metastatic colorectal cancer: A meta-analysis of randomized, controlled trials., 2015, 26,pp. 13-21. DOI: https://doi.org/10.1093/annonc/mdu378.

35. I.A. Prior; F.E. Hood; J.L. Hartley The Frequency of Ras Mutations in Cancer., 2020, 80,pp. 2969-2974. DOI: https://doi.org/10.1158/0008-5472.CAN-19-3682.

36. A. De la Chapelle; H. Hampel Clinical relevance of microsatellite instability in colorectal cancer., 2010, 28,pp. 3380-3387. DOI: https://doi.org/10.1200/JCO.2009.27.0652. PMID: https://www.ncbi.nlm.nih.gov/pubmed/20516444.

37. B. Lhermitte; C. Egele; N. Weingertner; D. Ambrosetti; B. Dadone; V. Kubiniek; F. Burel-Vandenbos; J. Coyne; J.-F. Michiels; M.-P. Chenard et al. Adequately defining tumor cell proportion in tissue samples for molecular testing improves interobserver reproducibility of its assessment., 2017, 470,pp. 21-27. DOI: https://doi.org/10.1007/s00428-016-2042-6.

38. A. Guyot D’Asnières De Salins; G. Tachon; R. Cohen; L. Karayan-Tapon; A. Junca; E. Frouin; J. Godet; C. Evrard; V. Randrian; A. Duval et al. Discordance between immunochemistry of mismatch repair proteins and molecular testing of microsatellite instability in colorectal cancer., 2021, 6,p. 100120. DOI: https://doi.org/10.1016/j.esmoop.2021.100120.

39. S. Forbes; J. Clements; E. Dawson; S. Bamford; T. Webb; A. Dogan; A. Flanagan; J. Teague; R. Wooster; P.A. Futreal et al. COSMIC 2005., 2006, 94,pp. 318-322. DOI: https://doi.org/10.1038/sj.bjc.6602928.

40. R. Gularte-Mérida; S. Smith; A.S. Bowman; A. da Cruz Paula; W. Chatila; C.M. Bielski; M. Vyas; L. Borsu; A. Zehir; L.G. Martelotto et al. Same-Cell Co-Occurrence of RAS Hotspot and BRAF V600E Mutations in Treatment-Naive Colorectal Cancer., 2022, 6,p. e2100365. DOI: https://doi.org/10.1200/PO.21.00365.

41. S. Kopetz; A. Grothey; R. Yaeger; E. Van Cutsem; J. Desai; T. Yoshino; H. Wasan; F. Ciardiello; F. Loupakis; Y.S. Hong et al. Encorafenib, Binimetinib, and Cetuximab in V600E-Mutated Colorectal Cancer., 2019, 381,pp. 1632-1643. DOI: https://doi.org/10.1056/NEJMoa1908075.

42. A.N. Shoushtari; W.K. Chatila; A. Arora; F. Sanchez-Vega; H.S. Kantheti; J.A. Rojas Zamalloa; P. Krieger; M.K. Callahan; A.B. Warner; M.A. Postow et al. Therapeutic Implications of Detecting MAPK-Activating Alterations in Cutaneous and Unknown Primary Melanomas., 2021, 27,pp. 2226-2235. DOI: https://doi.org/10.1158/1078-0432.CCR-20-4189.

43. J. Ros; I. Baraibar; E. Sardo; N. Mulet; F. Salvà; G. Argilés; G. Martini; D. Ciardiello; J.L. Cuadra; J. Tabernero et al. and inhibition as treatment strategies in V600E metastatic colorectal cancer., 2021, 13,p. 1758835921992974. DOI: https://doi.org/10.1177/1758835921992974.

44. A. Vittal; A. Middinti; A. Kasi Loknath Kumar Are All Mutations the Same? A Rare Case Report of Coexisting Mutually Exclusive KRAS and BRAF Mutations in a Patient with Metastatic Colon Adenocarcinoma., 2017, 2017,p. 2321052. DOI: https://doi.org/10.1155/2017/2321052.

45. I.A. Cree; Z. Deans; M.J.L. Ligtenberg; N. Normanno; A. Edsjö; E. Rouleau; F. Solé; E. Thunnissen; W. Timens; E. Schuuring et al. Guidance for laboratories performing molecular pathology for cancer patients., 2014, 67,pp. 923-931. DOI: https://doi.org/10.1136/jclinpath-2014-202404.

46. C. Cafiero; A. Re; G. D’Amato; P.L. Surico; G. Surico; M. Pirrelli; S. Pisconti KRAS and BRAF Concomitant Mutations in a Patient with Metastatic Colon Adenocarcinoma: An Interesting Case Report., 2020, 13,pp. 595-600. DOI: https://doi.org/10.1159/000507882.

47. D.J. Sargent; Q. Shi; G. Yothers; S. Tejpar; M.M. Bertagnolli; S.N. Thibodeau; T. Andre; R. Labianca; S. Gallinger; S.R. Hamilton et al. Prognostic impact of deficient mismatch repair (dMMR) in 7,803 stage II/III colon cancer (CC) patients (pts): A pooled individual pt data analysis of 17 adjuvant trials in the ACCENT database., 2014, 32,p. 3507. DOI: https://doi.org/10.1200/jco.2014.32.15_suppl.3507.

48. C.M. Ribic; D.J. Sargent; M.J. Moore; S.N. Thibodeau; A.J. French; R.M. Goldberg; S.R. Hamilton; P. Laurent-Puig; R. Gryfe; L.E. Shepherd et al. Tumor microsatellite-instability status as a predictor of benefit from fluorouracil-based adjuvant chemotherapy for colon cancer., 2003, 349,pp. 247-257. DOI: https://doi.org/10.1056/NEJMoa022289.

49. B. Wang; F. Li; X. Zhou; Y. Ma; W. Fu Is microsatellite instability-high really a favorable prognostic factor for advanced colorectal cancer? A meta-analysis., 2019, 17,p. 169. DOI: https://doi.org/10.1186/s12957-019-1706-5.

Figures and Tables

Figure 1: Plot of patients (P) enrolled in the study, visualizing diagnosis, age, gender, neoplastic cells percentage (NCP) in a tissue sample, mutation status of RAS, BRAF, and MSI status. The color representation of each parameter is explained in the legend below the plot. [Please download the PDF to view the image]

Figure 2: Percentage distribution of patients according to sex and age, clustered into age groups. [Please download the PDF to view the image]

Table 1: List of CRC subtypes according to ICD-10 with quantities of patients involved in our research.
DiagnosisICD-10 CodeNo. of Patients


Malignant neoplasm of colon


C18


3


Malignant neoplasm of cecum


C18.0


6


Malignant neoplasm of ascending colon


C18.2


4


Malignant neoplasm of splenic flexure


C18.5


3


Malignant neoplasm of sigmoid colon


C18.7


13


Malignant neoplasm of overlapping sites of colon


C18.8


1


Malignant neoplasm of colon, unspecified


C18.9


4


Malignant neoplasm of rectosigmoid junction


C19


11


Malignant neoplasm of rectum


C20


29


Malignant neoplasm of anus, unspecified


C21.0


6


Malignant neoplasm of intestinal tract, part unspecified


C26.0


2


Malignant neoplasm of ill-defined sites within the digestive system


C26.9


1


Table 2: Summary of results of MSI status and mutation status of BRAF, KRAS, and NRAS genes with the percentage of affected patients.
MSI-HBRAFKRAS/NRAS


Positive


4 (4.8%)


5 (6.0%)


KRAS: 33 (39.8%)


NRAS: 6 (7.2%)


Negative


79 (95.2%)


78 (94.0%)


44 (53.0%)


Table 3: Results of genetic testing and immunohistochemical detection of MMR protein expression in patients with MSI-H tumors.
PICD-10AgeGenderNCPRASBRAFMSIMMR


6


C18.2


62


F


100


KRAS: c.38G > A, p.G13D


N


MSI-H


MLH1-, PMS2-


31


C18


74


M


80


N


p.V600E


MSI-H


MLH1-, PMS2-


35


C18.2


79


F


70


KRAS: c.35G > A, p.G12D


p.V600E


MSI-H


MLH1-, MSH2-, PMS2-


37


C18.2


67


M


90


KRAS: c.35G > A, p.Gly12Asp


N


MSI-H


MLH1-


P—patient number; NCP—neoplastic cells percentage in the examined sample; RAS—mutational status; BRAF—mutational status; MMR—expression of MMR proteins by IHC; N—no mutation present; symbol “-“ after a specific name of MMR protein indicates the loss of its expression.

Author Affiliation(s):

[1] Institute of Medical Biology, Genetics and Clinical Genetics, Faculty of Medicine, Comenius University, 811 08 Bratislava, Slovakia; [email protected]

[2] 2nd Department of Gynaecology and Obstetrics, Faculty of Medicine, Comenius University, 811 08 Bratislava, Slovakia; [email protected]

[3] Geneton Ltd., 841 04 Bratislava, Slovakia; [email protected] (O.P.); [email protected] (T.S.)

[4] Science Park, Comenius University, 841 04 Bratislava, Slovakia

[5] Department of Pathological Anatomy, National Cancer Institute, 833 10 Bratislava, Slovakia; [email protected] (G.K.);

[6] Department of Medical Genetics, National Cancer Institute, 833 10 Bratislava, Slovakia

[7] National Cancer Institute, Surgical Oncology Clinic of Slovak Medical University, 833 10 Bratislava, Slovakia

Author Note(s):

[*] Correspondence: [email protected]

DOI: 10.3390/cancers16061128
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Author:Rendek, Tomas; Saade, Rami; Pos, Ondrej; Kolnikova, Georgina; Urbanova, Monika; Budis, Jaroslav; Mih
Publication:Cancers
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Date:Mar 1, 2024
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