1
|
Strickler JH, Yoshino T, Stevinson K, Eichinger CS, Giannopoulou C, Rehn M, Modest DP. Prevalence of KRAS G12C Mutation and Co-mutations and Associated Clinical Outcomes in Patients With Colorectal Cancer: A Systematic Literature Review. Oncologist 2023; 28:e981-e994. [PMID: 37432264 PMCID: PMC10628573 DOI: 10.1093/oncolo/oyad138] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2022] [Accepted: 04/20/2023] [Indexed: 07/12/2023] Open
Abstract
PURPOSE A systematic literature review was conducted to estimate the global prevalence of Kirsten rat sarcoma virus gene (KRAS) mutations, with an emphasis on the clinically significant KRAS G12C mutation, and to estimate the prognostic significance of these mutations in patients with colorectal cancer (CRC). DESIGN Relevant English-language publications in the Embase, MEDLINE, and the Cochrane Library databases (from 2009 to 2021) and congress presentations (from 2016 to 2021) were reviewed. Eligible studies were those that reported the prevalence and clinical outcomes of the KRAS G12C mutation in patients with CRC. RESULTS A total of 137 studies (interventional [n = 8], post hoc analyses of randomized clinical trials [n = 6], observational [n = 122], and longitudinal [n =1]) were reviewed. Sixty-eight studies reported the prevalence of KRAS mutations (KRASm) in 42 810 patients with CRC. The median global prevalence of KRASm was 38% (range, 13.3%-58.9%) and that of the KRAS G12C mutation (KRAS G12C) 3.1% (range, 0.7%-14%). Available evidence suggests that KRASm are possibly more common in tumors that develop on the right side of the colon. Limited evidence suggests a lower objective response rate and inferior disease-free/relapse-free survival in patients with KRAS G12C compared with patients with KRASwt or other KRASm. CONCLUSION Our analysis reveals that KRAS G12C is prevalent in 3% of patients with CRC. Available evidence suggests a poor prognosis for patients with KRAS G12C. Right-sided tumors were more likely to harbor KRASm; however, their role in determining clinical outcomes needs to be investigated further.
Collapse
Affiliation(s)
- John H Strickler
- Department of Medicine, Duke University Medical Center, Durham, NC, USA
| | - Takayuki Yoshino
- Department of Gastroenterology and Gastrointestinal Oncology, National Cancer Center Hospital East, Kashiwa, Japan
| | - Kendall Stevinson
- Health Economics and Outcomes Researc, Amgen Inc., Thousand Oaks, CA, USA
| | | | | | - Marko Rehn
- Global Medical Affairs, Amgen Inc., Thousand Oaks, CA, USA
| | - Dominik Paul Modest
- Department for Hematology, Oncology and Cancer Immunology (CVK), Charité Universitätsmedizin Berlin, Berlin, Germany
| |
Collapse
|
2
|
Prognostic and Predictive Cross-Roads of Microsatellite Instability and Immune Response to Colon Cancer. Int J Mol Sci 2020; 21:ijms21249680. [PMID: 33353162 PMCID: PMC7766746 DOI: 10.3390/ijms21249680] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/18/2020] [Revised: 12/14/2020] [Accepted: 12/15/2020] [Indexed: 12/21/2022] Open
Abstract
Understanding molecular features of colon cancer has shed light on its pathogenesis and progression. Over time, some of these features acquired clinical dignity and were incorporated in decision making. Namely, microsatellite instability (MSI) due to mismatch repair of defects, which primarily was adopted for the diagnosis of Lynch syndrome, became recognized as the biomarker of a different disease type, showing a less aggressive behavior. MSI tumors harbor high amounts of tumor infiltrating lymphocytes (TILs) due to their peculiar load in neoantigens. However, microsatellite stable colon cancer may also show high amounts of TILs, and this feature is as well associated with better outcomes. High TIL loads are in general associated with a favorable prognosis, especially in stage II colon cancer, and therein identifies a patient subset with the lowest probability of relapse. With respect to post-surgical adjuvant treatment, particularly in stage III, TILs predictive ability seems to weaken along with the progression of the disease, being less evident in high risk patients. Moving from cohort studies to the analysis of a series from clinical trials contributed to increase the robustness of TILs as a biomarker. The employment of high TIL densities as an indicator of good prognosis in early-stage colon cancers is strongly advisable, while in late-stage colon cancers the employment as an indicator of good responsiveness to post-surgical therapy requires refinement. It remains to be clarified whether TILs could help in identifying those patients with node-positive cancers to whom adjuvant treatment could be spared, at least in low-risk groups as defined by the TNM staging system.
Collapse
|
3
|
Nazemalhosseini-Mojarad E, Kishani Farahani R, Mehrizi M, Baghaei K, Yaghoob Taleghani M, Golmohammadi M, Peyravian N, Ashtari S, Pourhoseingholi MA, Asadzadeh Aghdaei H, Zali MR. Prognostic Value of BRAF and KRAS Mutation in Relation to Colorectal Cancer Survival in Iranian Patients: Correlated to Microsatellite Instability. J Gastrointest Cancer 2020; 51:53-62. [PMID: 30635874 DOI: 10.1007/s12029-019-00201-4] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
PURPOSE To evaluate the prognostic role of BRAF and KRAS mutations after adjustment for microsatellite instability (MSI) in Iranian colorectal cancer (CRC) patients. METHODS BRAF and KRAS mutations and MSI status were assessed in 258 Iranian subjects with CRC. Two hundred fifty-eight consecutive stages I-IV CRC patients, who underwent surgical resection of adenocarcinoma from 2012 to 2016, were enrolled in the research. Pyrosequencing and Cast-PCR methods were used to the detection of KRAS and BRAF mutations. Kaplan-Meier and Cox regression were employed to estimate hazard ratios (HR) for the association between BRAF and KRAS mutation and overall survival (OS). RESULTS KRAS and BRAF mutations were detected in 36 (14%) and 15 (5.8%) cases of 258 patients with CRC, respectively. BRAF mutations that all comprised V600E and KRAS mutations was found in codon 12 and 13 (80.6% and 19.4%), respectively. KRAS mutations were detected in 19 (15.4%) patients of 123 microsatellite stable (MSS) CRC and it is significantly associated with tumor location and metastasis. BRAF and KRAS mutant vs. wild type of BRAF and KRAS, 5-year OS was 73.3% vs. 82.3% and 83.3% vs. 81.5% (long-rank P > 0.05), respectively. KRAS mutant vs. KRAS-wild-type tumors in MSS/MSI-L status CRC patients, 5-year OS was 78.9% vs. 90.4% (long-rank p = 0.046). CONCLUSION The present study revealed that BRAF and KRAS mutations were not related to the worse overall survival, while KRAS mutation can be a prognostic factor for overall survival in sporadic microsatellite-stable (MSS) status in Iranian CRC patients.
Collapse
Affiliation(s)
- Ehsan Nazemalhosseini-Mojarad
- Basic and Molecular Epidemiology of Gastrointestinal Disorders Research Center, Research Institute for Gastroenterology and Liver Diseases, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - Roya Kishani Farahani
- Basic and Molecular Epidemiology of Gastrointestinal Disorders Research Center, Research Institute for Gastroenterology and Liver Diseases, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - Maryam Mehrizi
- Basic and Molecular Epidemiology of Gastrointestinal Disorders Research Center, Research Institute for Gastroenterology and Liver Diseases, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - Kaveh Baghaei
- Gastroenterology and Liver Diseases Research Center, Research Institute for Gastroenterology and Liver Diseases, Taleghani Hospital, Shahid Beheshti University of Medical Sciences, Erabi Ave, P.O. Box 1985717413, Tehran, Velenjak, Iran
| | - Mohammad Yaghoob Taleghani
- Basic and Molecular Epidemiology of Gastrointestinal Disorders Research Center, Research Institute for Gastroenterology and Liver Diseases, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - Mina Golmohammadi
- Basic and Molecular Epidemiology of Gastrointestinal Disorders Research Center, Research Institute for Gastroenterology and Liver Diseases, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - Noshad Peyravian
- Basic and Molecular Epidemiology of Gastrointestinal Disorders Research Center, Research Institute for Gastroenterology and Liver Diseases, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - Sara Ashtari
- Gastroenterology and Liver Diseases Research Center, Research Institute for Gastroenterology and Liver Diseases, Taleghani Hospital, Shahid Beheshti University of Medical Sciences, Erabi Ave, P.O. Box 1985717413, Tehran, Velenjak, Iran.
| | - Mohmad Amin Pourhoseingholi
- Gastroenterology and Liver Diseases Research Center, Research Institute for Gastroenterology and Liver Diseases, Taleghani Hospital, Shahid Beheshti University of Medical Sciences, Erabi Ave, P.O. Box 1985717413, Tehran, Velenjak, Iran
| | - Hamid Asadzadeh Aghdaei
- Gastroenterology and Liver Diseases Research Center, Research Institute for Gastroenterology and Liver Diseases, Taleghani Hospital, Shahid Beheshti University of Medical Sciences, Erabi Ave, P.O. Box 1985717413, Tehran, Velenjak, Iran
| | - Mohammad Reza Zali
- Gastroenterology and Liver Diseases Research Center, Research Institute for Gastroenterology and Liver Diseases, Taleghani Hospital, Shahid Beheshti University of Medical Sciences, Erabi Ave, P.O. Box 1985717413, Tehran, Velenjak, Iran
| |
Collapse
|
4
|
Abetov DA, Kiyan VS, Zhylkibayev AA, Sarbassova DA, Alybayev SD, Spooner E, Song MS, Bersimbaev RI, Sarbassov DD. Formation of mammalian preribosomes proceeds from intermediate to composed state during ribosome maturation. J Biol Chem 2019; 294:10746-10757. [PMID: 31076509 DOI: 10.1074/jbc.ac119.008378] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/12/2019] [Revised: 05/07/2019] [Indexed: 12/28/2022] Open
Abstract
In eukaryotes, ribosome assembly is a rate-limiting step in ribosomal biogenesis that takes place in a distinctive subnuclear organelle, the nucleolus. How ribosomes get assembled at the nucleolar site by forming initial preribosomal complexes remains poorly characterized. In this study, using several human and murine cell lines, we developed a method for isolation of native mammalian preribosomal complexes by lysing cell nuclei through mild sonication. A sucrose gradient fractionation of the nuclear lysate resolved several ribonucleoprotein (RNP) complexes containing rRNAs and ribosomal proteins. Characterization of the RNP complexes with MS-based protein identification and Northern blotting-based rRNA detection approaches identified two types of preribosomes we named here as intermediate preribosomes (IPRibs) and composed preribosome (CPRib). IPRib complexes comprised large preribosomes (105S to 125S in size) containing the rRNA modification factors and premature rRNAs. We further observed that a distinctive CPRib complex consists of an 85S preribosome assembled with mature rRNAs and a ribosomal biogenesis factor, Ly1 antibody-reactive (LYAR), that does not associate with premature rRNAs and rRNA modification factors. rRNA-labeling experiments uncovered that IPRib assembly precedes CPRib complex formation. We also found that formation of the preribosomal complexes is nutrient-dependent because the abundances of IPRib and CPRib decreased substantially when cells were either deprived of amino acids or exposed to an mTOR kinase inhibitor. These findings indicate that preribosomes form via dynamic and nutrient-dependent processing events and progress from an intermediate to a composed state during ribosome maturation.
Collapse
Affiliation(s)
- Danysh A Abetov
- Department of Molecular and Cellular Oncology, University of Texas MD Anderson Cancer Center, Houston, Texas 77030
| | - Vladimir S Kiyan
- Department of Molecular and Cellular Oncology, University of Texas MD Anderson Cancer Center, Houston, Texas 77030
| | - Assylbek A Zhylkibayev
- Department of Molecular and Cellular Oncology, University of Texas MD Anderson Cancer Center, Houston, Texas 77030
| | - Dilara A Sarbassova
- Department of Molecular and Cellular Oncology, University of Texas MD Anderson Cancer Center, Houston, Texas 77030
| | - Sanzhar D Alybayev
- Department of Molecular and Cellular Oncology, University of Texas MD Anderson Cancer Center, Houston, Texas 77030
| | - Eric Spooner
- Whitehead Institute for Biomedical Research, Massachusetts Institute of Technology, Cambridge, Massachusetts 02142
| | - Min Sup Song
- Department of Molecular and Cellular Oncology, University of Texas MD Anderson Cancer Center, Houston, Texas 77030; MD Anderson Cancer Center UTHealth Graduate School of Biomedical Sciences, Houston, Texas 77030
| | - Rakhmetkazhy I Bersimbaev
- Department of Natural Sciences, L. N. Gumilyov Eurasian National University, Nur-Sultan 010000, Kazakhstan, and
| | - Dos D Sarbassov
- Department of Molecular and Cellular Oncology, University of Texas MD Anderson Cancer Center, Houston, Texas 77030; MD Anderson Cancer Center UTHealth Graduate School of Biomedical Sciences, Houston, Texas 77030,; Department of Biology, Nazarbayev University, Nur-Sultan 010000, Kazakhstan.
| |
Collapse
|
5
|
Sayagués JM, Del Carmen S, Del Mar Abad M, Corchete LA, Bengoechea O, Anduaga MF, Baldeón MJ, Cruz JJ, Alcazar JA, Angoso M, González M, García J, Muñoz-Bellvis L, Orfao A, Sarasquete ME. Combined assessment of the TNM stage and BRAF mutational status at diagnosis in sporadic colorectal cancer patients. Oncotarget 2018; 9:24081-24096. [PMID: 29844874 PMCID: PMC5963609 DOI: 10.18632/oncotarget.25300] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2017] [Accepted: 04/06/2018] [Indexed: 12/12/2022] Open
Abstract
The prognostic impact of KRAS mutations and other KRAS-related and non-related genes such as BRAF, NRAS and TP53, on sporadic colorectal cancer (sCRC) remain controversial and/or have not been fully established. Here we investigated the frequency of such mutations in primary sCRC tumors and their impact on patient progression-free survival (PFS) and overall survival (OS). Primary tumor tissues from 87 sCRC patients were analysed using a custom-built next generation sequencing (NGS) panel to assess the hotspot mutated regions of KRAS/NRAS (exons 2, 3 and 4), BRAF (exon 15) and TP53 (all exons). Overall, mutations in these genes were detected in 46/87 sCRC tumors analyzed (53%) with the following frequencies per gene: TP53, 33%; KRAS, 28%; BRAF, 7%; and NRAS, 1%. A significant association was found between KRAS mutations and right side colon tumor location (p=0.05), well-differentiated tumors (p=0.04) and absence of lymphovascular invasion (p=0.05). In turn, BRAF-mutated tumors frequently corresponded to poorly- or moderately-differentiated sCRC (p=0.02) and showed a higher frequency of peritoneal carcinomatosis (p=0.006) and microsatellite instability (p=0.007). From the prognostic point of view, the BRAF mutational status together with the TNM stage were the only variables that showed an independent adverse impact on patient outcome in the multivariate analyses for both PFS and OS. Based on these results a scoring system was built and patients were classified into three prognostic subgroups with different PFS rates at 2 years: 91% vs. 77% vs. 0%, respectively (p<0.0001). Additional prospective studies in larger series of sCRC patients where mutations in genes other than those investigated here are required to validate the utility of the proposed predictive model.
Collapse
Affiliation(s)
- José María Sayagués
- Cytometry Service-NUCLEUS, Department of Medicine, Cancer Research Center (IBMCC-CSIC/USAL), CIBERONC and IBSAL (University Hospital of Salamanca), Salamanca, Spain
| | - Sofía Del Carmen
- Department of Pathology, University Hospital of Salamanca, Salamanca, Spain
| | - María Del Mar Abad
- Department of Pathology, University Hospital of Salamanca, Salamanca, Spain
| | - Luís Antonio Corchete
- Cáncer Research Center and Service of Hematology (University Hospital of Salamanca), Salamanca, Spain
| | - Oscar Bengoechea
- Department of Pathology, University Hospital of Salamanca, Salamanca, Spain
| | - María Fernanda Anduaga
- Service of General and Gastrointestinal Surgery, University Hospital of Salamanca, Salamanca, Spain
| | - María Jesús Baldeón
- Department of Oncology (University Hospital of Salamanca) and IBSAL (University Hospital of Salamanca), Salamanca, Spain
| | - Juan Jesús Cruz
- Department of Oncology (University Hospital of Salamanca) and IBSAL (University Hospital of Salamanca), Salamanca, Spain
| | - Jose Antonio Alcazar
- Service of General and Gastrointestinal Surgery, University Hospital of Salamanca, Salamanca, Spain
| | - María Angoso
- Service of General and Gastrointestinal Surgery, University Hospital of Salamanca, Salamanca, Spain
| | - Marcos González
- Cáncer Research Center and Service of Hematology (University Hospital of Salamanca), Salamanca, Spain
| | - Jacinto García
- Service of General and Gastrointestinal Surgery, University Hospital of Salamanca, Salamanca, Spain
| | - Luís Muñoz-Bellvis
- Service of General and Gastrointestinal Surgery, University Hospital of Salamanca, Salamanca, Spain
| | - Alberto Orfao
- Cytometry Service-NUCLEUS, Department of Medicine, Cancer Research Center (IBMCC-CSIC/USAL), CIBERONC and IBSAL (University Hospital of Salamanca), Salamanca, Spain
| | - María Eugenia Sarasquete
- Cáncer Research Center and Service of Hematology (University Hospital of Salamanca), Salamanca, Spain
| |
Collapse
|
6
|
Grizzi F, Basso G, Borroni EM, Cavalleri T, Bianchi P, Stifter S, Chiriva-Internati M, Malesci A, Laghi L. Evolving notions on immune response in colorectal cancer and their implications for biomarker development. Inflamm Res 2018; 67:375-389. [PMID: 29322204 DOI: 10.1007/s00011-017-1128-1] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2017] [Revised: 12/27/2017] [Accepted: 12/29/2017] [Indexed: 12/11/2022] Open
Abstract
INTRODUCTION Colorectal cancer (CRC) still represents the third most commonly diagnosed type of cancer in men and women worldwide. CRC is acknowledged as a heterogeneous disease that develops through a multi-step sequence of events driven by clonal selections; this observation is sustained by the fact that histologically similar tumors may have completely different outcomes, including a varied response to therapy. METHODS In "early" and "intermediate" stage of CRC (stages II and III, respectively) there is a compelling need for new biomarkers fit to assess the metastatic potential of their disease, selecting patients with aggressive disease that might benefit from adjuvant and targeted therapies. Therefore, we review the actual notions on immune response in colorectal cancer and their implications for biomarker development. RESULTS The recognition of the key role of immune cells in human cancer progression has recently drawn attention on the tumor immune microenvironment, as a source of new indicators of tumor outcome and response to therapy. Thus, beside consolidated histopathological biomarkers, immune endpoints are now emerging as potential biomarkers. CONCLUSIONS The introduction of immune signatures and cellular and molecular components of the immune system as biomarkers is particularly important considering the increasing use of immune-based cancer therapies as therapeutic strategies for cancer patients.
Collapse
Affiliation(s)
- Fabio Grizzi
- Department of Immunology and Inflammation, Humanitas Clinical and Research Center, Via Manzoni 56, 20089, Rozzano, Milan, Italy.
| | - Gianluca Basso
- Laboratory of Molecular Gastroenterology, Humanitas Clinical and Research Center, Rozzano, Milan, Italy
| | - Elena Monica Borroni
- Department of Biotechnology and Translational Medicine, University of Milan, Milan, Italy
| | - Tommaso Cavalleri
- Laboratory of Molecular Gastroenterology, Humanitas Clinical and Research Center, Rozzano, Milan, Italy
| | - Paolo Bianchi
- Laboratory of Molecular Gastroenterology, Humanitas Clinical and Research Center, Rozzano, Milan, Italy
| | - Sanja Stifter
- Department of Pathology, School of Medicine, University of Rijeka, Rijeka, Croatia
| | | | - Alberto Malesci
- Laboratory of Molecular Gastroenterology, Humanitas Clinical and Research Center, Rozzano, Milan, Italy
- Department of Gastroenterology, Humanitas Clinical and Research Center, Rozzano, Milan, Italy
- Department of Biotechnology and Translational Medicine, University of Milan, Milan, Italy
| | - Luigi Laghi
- Laboratory of Molecular Gastroenterology, Humanitas Clinical and Research Center, Rozzano, Milan, Italy
- Department of Gastroenterology, Humanitas Clinical and Research Center, Rozzano, Milan, Italy
- Hereditary Cancer Genetics Clinic, Humanitas Clinical and Research Center, Rozzano, Milan, Italy
| |
Collapse
|
7
|
Botezatu IV, Panchuk IO, Stroganova AM, Senderovich AI, Kondratova VN, Shelepov VP, Lichtenstein AV. Scanning for KRAS, NRAS, BRAF, and PIK3CA mutations by DNA melting analysis with TaqMan probes. Mol Biol 2017. [DOI: 10.1134/s002689331701006x] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
|
8
|
Prognostic and Predictive Value of RAS Gene Mutations in Colorectal Cancer: Moving Beyond KRAS Exon 2. Drugs 2016; 75:1739-56. [PMID: 26347132 DOI: 10.1007/s40265-015-0459-x] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
The advent of anti-EGFR (epidermal growth factor receptor) therapy resulted in significant progress in the treatment of metastatic colorectal cancer patients. However, many patients do not respond to this therapy or develop acquired resistance within a few months after the start of treatment. Since 2008, anti-EGFR therapy is restricted to KRAS wild-type patients as it has been shown that KRAS exon 2-mutated patients do not respond to this therapy. Still, up to 60 % of KRAS exon 2 wild-type patients show primary resistance to this treatment. Recently, several studies investigating the predictive and prognostic role of RAS mutations other than in KRAS exon 2 demonstrated that patients with these mutations are not responding to therapy. However, the role of these mutations has long been questioned as The National Comprehensive Cancer Network Guidelines in Oncology and the European Medicines Agency indications had already been changed in order to restrict anti-EGFR therapy to all RAS wild-type colorectal cancer patients, while the Food and Drug Administration guidelines remained unchanged. Recently, the Food and Drug Administration guidelines have also been changed, which implies the importance of RAS mutations beyond KRAS exon 2 in colorectal cancer. In this review, we discuss the most important studies regarding the predictive and prognostic role of RAS mutations other than in KRAS exon 2 in order to demonstrate the importance of these RAS mutations in patients with metastatic colorectal cancer treated with anti-EGFR therapy.
Collapse
|
9
|
Botezatu IV, Nechaeva IO, Stroganova АМ, Senderovich AI, Kondratova VN, Shelepov VP, Lichtenstein AV. Optimization of melting analysis with TaqMan probes for detection of KRAS, NRAS, and BRAF mutations. Anal Biochem 2015; 491:75-83. [DOI: 10.1016/j.ab.2015.09.005] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2015] [Revised: 09/06/2015] [Accepted: 09/07/2015] [Indexed: 01/04/2023]
|
10
|
Liu QZ, Gao XH, Chang WJ, Gong HF, Fu CG, Zhang W, Cao GW. Expression of ITGB1 predicts prognosis in colorectal cancer: a large prospective study based on tissue microarray. INTERNATIONAL JOURNAL OF CLINICAL AND EXPERIMENTAL PATHOLOGY 2015; 8:12802-12810. [PMID: 26722470 PMCID: PMC4680415] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Subscribe] [Scholar Register] [Received: 08/23/2015] [Accepted: 09/25/2015] [Indexed: 06/05/2023]
Abstract
BACKGROUND ITGB1 is a heterodimeric cell-surface receptor involved in cell functions such as proliferation, migration, invasion and survival. The aim of this study was to assess ITGB1 expression in colorectal cancer and correlate it with clinicopathological features, as well as to evaluate its potential prognostic significance. MATERIALS AND METHODS In this study, we examined the expression of ITGB1 using tissue microarrays containing analyzed specimens by immunohistochemistry. ITGB1 expression was further correlated with clinicopathological and prognostic data. The prognostic significance was assessed using Kaplan-Meier survival estimates and log-rank tests. A multivariate study with the Cox's proportional hazard model was used to evaluate the prognostic aspects. RESULTS ITGB1 expression was present in 88.5% of the analyzed specimens. Significant differences in ITGB1 expression were found between normal mucosa and carcinomas (P<0.001). High ITGB1 expression was associated with poor prognosis, and it independently correlated with shortened overall survival and disease-free survival in colorectal cancer patients (P<0.001). More so, ITGB1 expression, bowel wall invasion, lymph node metastasis and distant metastasis were independent prognostic factors for overall survival. Additionally, significant differences in ITGB1 expression were observed in adenomas and tumors from patients with familial adenomatous polyposis compared to normal colon mucosa (P<0.05) CONCLUSION: The results of this study indicate that ITGB1 overexpression in colorectal tumors is associated with poor prognosis, as well as aggressive clinicopathological features. Therefore, ITGB1 expression could be used as potential prognostic predictor in colorectal cancer patients.
Collapse
Affiliation(s)
- Qi-Zhi Liu
- Department of Colorectal Surgery, Changhai Hospital, Second Military Medical UniversityShanghai, China
| | - Xian-Hua Gao
- Department of Colorectal Surgery, Changhai Hospital, Second Military Medical UniversityShanghai, China
| | - Wen-Jun Chang
- Department of Epidemiology, Second Military Medical UniversityShanghai, China
| | - Hai-Feng Gong
- Department of Colorectal Surgery, Changhai Hospital, Second Military Medical UniversityShanghai, China
| | - Chuan-Gang Fu
- Department of Colorectal Surgery, Changhai Hospital, Second Military Medical UniversityShanghai, China
| | - Wei Zhang
- Department of Colorectal Surgery, Changhai Hospital, Second Military Medical UniversityShanghai, China
| | - Guang-Wen Cao
- Department of Epidemiology, Second Military Medical UniversityShanghai, China
| |
Collapse
|
11
|
Liang J, Khorana AA, Kalady MF. BRAF-mutated colorectal cancer: clinical implications for a distinct subset of the disease. COLORECTAL CANCER 2015. [DOI: 10.2217/crc.15.15] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
Abstract
SUMMARY Colorectal cancer (CRC) is many diseases, with each case defined by the underlying genetic and molecular changes of that particular tumor. The heterogeneity of CRC emphasizes the need to understand this disease within the context of genetic subsets. BRAF mutations mark a subpopulation that arises through the serrated pathway to carcinogenesis. This subset of cancers is associated with unique clinical and histopathologic characteristics. BRAF-mutated CRCs have a worse prognosis compared with their wild-type counterparts, and may not be as responsive to chemotherapy. Target therapies specifically against BRAF and its related signaling pathways are under both scientific and clinical investigation. This article highlights the clinical relevance of the subset of BRAF-mutated CRCs.
Collapse
Affiliation(s)
- Jennifer Liang
- Department of Colorectal Surgery, Cleveland Clinic, 9500 Euclid Avenue, A30, Cleveland, OH 44195, USA
| | - Alok A Khorana
- Taussig Cancer Institute, Cleveland Clinic, Cleveland, OH 44195, USA
| | - Matthew F Kalady
- Department of Colorectal Surgery, Cleveland Clinic, 9500 Euclid Avenue, A30, Cleveland, OH 44195, USA
- Taussig Cancer Institute, Cleveland Clinic, Cleveland, OH 44195, USA
| |
Collapse
|
12
|
Danese E, Minicozzi AM, Benati M, Montagnana M, Paviati E, Salvagno GL, Lima-Oliveira G, Gusella M, Pasini F, Lippi G, Guidi GC. Comparison of genetic and epigenetic alterations of primary tumors and matched plasma samples in patients with colorectal cancer. PLoS One 2015; 10:e0126417. [PMID: 25946211 PMCID: PMC4422441 DOI: 10.1371/journal.pone.0126417] [Citation(s) in RCA: 39] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/11/2015] [Accepted: 04/01/2015] [Indexed: 02/06/2023] Open
Abstract
Background Although recent advances in circulating DNA analysis allow the prediction of tumor genomes by noninvasive means, some challenges remain, which limit the widespread introduction of cfDNA in cancer diagnostics. We analyzed the status of the two best characterized colorectal cancer (CRC) genetic and epigenetic alterations in a cohort of CRC patients, and then compared the degree to which the two patterns move from tissue to plasma in order to improve our understanding of biology modulating the concordance between tissues and plasma methylation and mutation profiles. Methods Plasma and tumor tissues were collected from 85 patients (69±14 years, 56 males). KRAS and SEPT9 status was assessed by allele refractory mutation system quantitative PCR and quantitative methylation-specific PCR, respectively. Six of the most common point mutations at codon 12 and 13 were investigated for KRAS analysis. Results KRAS mutations and SEPT9 promoter methylation were present in 34% (29/85) and in 82% (70/85) of primary tumor tissue samples. Both genetic and epigenetic analyses of cfDNA revealed a high overall concordance and specificity compared with tumor-tissue analyses. Patients presenting with both genetic and epigenetic alterations in tissue specimens (31.8%, 27/85) were considered for further analyses. The median methylation rates in tumour tissues and plasma samples were 64.5% (12.2–99.8%) and 14.5% (0–45.5%), respectively. The median KRAS mutation load (for matched mutations) was 33.6% (1.8–86.3%) in tissues and 2.9% (0–17.3) in plasma samples. The plasma/tissue (p/t) ratio of SEPT9 methylation rate was significantly higher than the p/t ratio of KRAS mutation load, especially in early stage cancers (p=0.0108). Conclusion The results of this study show a discrepant rate of epigenetic vs. genetic alterations moving from tissue to plasma. Many factors could affect mutation cfDNA analysis, including both presence of tumor clonal heterogeneity and strict compartmentalization of KRAS mutation profile. The present study highlights the importance of considering the nature of the alteration when analyzing tumor-derived cfDNA.
Collapse
Affiliation(s)
- Elisa Danese
- Laboratory of Clinical Biochemistry, Department of Life and Reproduction Sciences, University Hospital of Verona, Verona, Italy
- * E-mail:
| | - Anna Maria Minicozzi
- National Centre for Bowel Research and Surgical Innovation (NCBRSI), Academic Surgical Unit, Barts and The London NHS Trust, Queen Mary University of London, London, United Kingdom
| | - Marco Benati
- Laboratory of Clinical Biochemistry, Department of Life and Reproduction Sciences, University Hospital of Verona, Verona, Italy
| | - Martina Montagnana
- Laboratory of Clinical Biochemistry, Department of Life and Reproduction Sciences, University Hospital of Verona, Verona, Italy
| | - Elisa Paviati
- Laboratory of Clinical Biochemistry, Department of Life and Reproduction Sciences, University Hospital of Verona, Verona, Italy
| | - Gian Luca Salvagno
- Laboratory of Clinical Biochemistry, Department of Life and Reproduction Sciences, University Hospital of Verona, Verona, Italy
| | - Gabriel Lima-Oliveira
- Laboratory of Clinical Biochemistry, Department of Life and Reproduction Sciences, University Hospital of Verona, Verona, Italy
| | - Milena Gusella
- Oncology Department, Laboratory of Pharmacology and Molecular Biology, Rovigo General Hospital, Trecenta, Rovigo, Italy
| | - Felice Pasini
- Department of Medical Oncology, Rovigo Hospital, Rovigo, Italy
| | - Giuseppe Lippi
- Laboratory of Clinical Chemistry and Hematology, Academic Hospital of Parma, Parma, Italy
| | - Gian Cesare Guidi
- Laboratory of Clinical Biochemistry, Department of Life and Reproduction Sciences, University Hospital of Verona, Verona, Italy
| |
Collapse
|
13
|
Anti-EGFR Resistance in Colorectal Cancer: Current Knowledge and Future Perspectives. CURRENT COLORECTAL CANCER REPORTS 2014. [DOI: 10.1007/s11888-014-0242-5] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
|
14
|
Boeckx C, Op de Beeck K, Wouters A, Deschoolmeester V, Limame R, Zwaenepoel K, Specenier P, Pauwels P, Vermorken JB, Peeters M, Van Camp G, Baay M, Lardon F. Overcoming cetuximab resistance in HNSCC: The role of AURKB and DUSP proteins. Cancer Lett 2014; 354:365-77. [DOI: 10.1016/j.canlet.2014.08.039] [Citation(s) in RCA: 46] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2014] [Revised: 08/06/2014] [Accepted: 08/27/2014] [Indexed: 11/26/2022]
|
15
|
Boeckx C, Weyn C, Vanden Bempt I, Deschoolmeester V, Wouters A, Specenier P, Van Laer C, Van den Weyngaert D, Kockx M, Vermorken JB, Peeters M, Pauwels P, Lardon F, Baay M. Mutation analysis of genes in the EGFR pathway in Head and Neck cancer patients: implications for anti-EGFR treatment response. BMC Res Notes 2014; 7:337. [PMID: 24899223 PMCID: PMC4067106 DOI: 10.1186/1756-0500-7-337] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2014] [Accepted: 05/29/2014] [Indexed: 11/14/2022] Open
Abstract
Background Targeted therapy against the Epidermal Growth Factor Receptor (EGFR) is among the most promising molecular therapeutics for Head and Neck Squamous Cell Carcinoma (HNSCC). However, drug resistance limits the clinical efficacy of anti-EGFR monoclonal antibodies and no predictive biomarker has entered the clinic yet. Methods A retrospective clinical study was performed utilizing pathological specimens from 52 newly diagnosed HNSCC patients. These patients were screened for mutations in EGFR and KRAS. Tyrosine kinase mutations in EGFR and KRAS mutations were evaluated by high resolution melting analysis (HRMA), whereas EGFRvIII was determined using one-step real-time PCR. Finally, patient samples were screened for HPV-DNA by GP5+/6+ PCR. Survival analysis was performed using Kaplan-Meier analysis and significance was calculated using log-rank statistic. Results In our study population no EGFRvIII mutations were present. However, two silent mutations were found; T785T in exon 20 and R836R in exon 21 of the EGFR gene. Additionally, HRMA revealed an abnormal KRAS melting pattern in 7.0% of the samples. However, the KRAS StripAssay could confirm only one sample with a G12S mutation and none of these samples could be confirmed by direct sequencing. HPV DNA was present in 3/25 larynx and 9/27 oropharynx tumors. Conclusion The low rate of EGFR and KRAS mutations in this Belgian HNSCC population suggests that these genes will probably not play a major role in predicting response to anti-EGFR therapy in HNSCC. Hence, other predictive markers need to be discovered in order to optimize EGFR targeting therapy.
Collapse
Affiliation(s)
- Carolien Boeckx
- Center for Oncological Research (CORE) Antwerp, Laboratory of Cancer Research and Clinical Oncology, University of Antwerp, Wilrijk, Belgium.
| | | | | | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
16
|
Liang G, Li J, Sun B, Li S, Lü L, Wang Y, Chen B, Xiao Z. Deep sequencing reveals complex mechanisms of microRNA deregulation in colorectal cancer. Int J Oncol 2014; 45:603-10. [PMID: 24889194 DOI: 10.3892/ijo.2014.2474] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2014] [Accepted: 04/09/2014] [Indexed: 11/06/2022] Open
Abstract
Deregulated microRNAs (miRNAs) have been reported to be of functional relevance for tumor biology. In this study, we analyzed the small RNA transcriptomes of 10 paired colorectal cancer samples using SOLiD next-generation sequencing, and generated a total of >15141000 reads. miRNA expression profiles obtained by SOLiD sequencing correlated well with quantitative PCR results. The results showed that the expression of 36 miRNAs was significantly different between the two groups of samples. Additionally, we explored the global miRNA-mRNA interactions using a statistical model. In-depth analysis reveals a diagram of extensive post-transcriptional miRNA regulations. Signaling pathways associated with the miRNA altered expression signature were identified using gene enrichment analysis. The results suggest that these microRNAs, in the aggregate, regulate signaling pathways, such as MAPK, Wnt and p53 pathways in cancer, which are known to be involved in the transformation of colorectal cancer. This evidence demonstrates that miRNAs can cooperatively regulate a given pathway and play a subtle role by regulating their target genes.
Collapse
Affiliation(s)
- Gaofeng Liang
- State Key Laboratory of Bioelectronics, School of Biological Science and Medical Engineering, Southeast University, Nanjing 210096, P.R. China
| | - Junsheng Li
- Department of Hematology and Oncology, Zhongda Hospital, Southeast University, Nanjing 210009, P.R. China
| | - Bo Sun
- State Key Laboratory of Bioelectronics, School of Biological Science and Medical Engineering, Southeast University, Nanjing 210096, P.R. China
| | - Shuchun Li
- State Key Laboratory of Bioelectronics, School of Biological Science and Medical Engineering, Southeast University, Nanjing 210096, P.R. China
| | - Lanxin Lü
- State Key Laboratory of Bioelectronics, School of Biological Science and Medical Engineering, Southeast University, Nanjing 210096, P.R. China
| | - Yuanyuan Wang
- State Key Laboratory of Bioelectronics, School of Biological Science and Medical Engineering, Southeast University, Nanjing 210096, P.R. China
| | - Baoan Chen
- Department of Hematology and Oncology, Zhongda Hospital, Southeast University, Nanjing 210009, P.R. China
| | - Zhongdang Xiao
- State Key Laboratory of Bioelectronics, School of Biological Science and Medical Engineering, Southeast University, Nanjing 210096, P.R. China
| |
Collapse
|
17
|
KRAS mutations: analytical considerations. Clin Chim Acta 2014; 431:211-20. [PMID: 24534449 DOI: 10.1016/j.cca.2014.01.049] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2013] [Revised: 01/20/2014] [Accepted: 01/22/2014] [Indexed: 12/27/2022]
Abstract
Colorectal cancer (CRC) is the third most common cancer and the second most common cause of cancer death globally. Significant improvements in survival have been made in patients with metastasis by new therapies. For example, Cetuximab and Panitumumab are monoclonal antibodies that inhibit the epidermal growth receptor (EGFR). KRAS mutations in codon 12 and 13 are the recognized biomarkers that are analyzed in clinics before the administration of anti-EGFR therapy. Genetic analyses have revealed that mutations in KRAS predict a lack of response to Panitumumab and Cetuximab in patients with metastatic CRC (mCRC). Notably, it is estimated that 35-45% of CRC patients harbor KRAS mutations. Therefore, KRAS mutation testing should be performed in all individuals with the advanced CRC in order to identify the patients who will not respond to the monoclonal EGFR antibody inhibitors. New techniques for KRAS testing have arisen rapidly, and each technique has advantages and disadvantages. Herein, we review the latest published literature specific to KRAS mutation testing techniques. Since reliability and feasibility are important issues in clinical analyses. Therefore, this review also summarizes the effectiveness and limitations of numerous KRAS mutation testing techniques.
Collapse
|
18
|
Malapelle U, Carlomagno C, de Luca C, Bellevicine C, Troncone G. KRAS testing in metastatic colorectal carcinoma: challenges, controversies, breakthroughs and beyond. J Clin Pathol 2013; 67:1-9. [DOI: 10.1136/jclinpath-2013-201835] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
|
19
|
MACC1 mRNA levels predict cancer recurrence after resection of colorectal cancer liver metastases. Ann Surg 2013; 257:1089-95. [PMID: 23665971 DOI: 10.1097/sla.0b013e31828f96bc] [Citation(s) in RCA: 41] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
OBJECTIVE Upon colon cancer metastasis resection in liver, disease outcome is heterogeneous, ranging from indolent to very aggressive, with early recurrence. The aim of this study is to investigate the capability of metastasis associated in colon cancer 1 (MACC1) levels measured in liver metastasis specimens to predict further recurrence of the disease. METHODS Gene expression and gene dosage of MACC1, hepatocyte growth factor (HGF), and hepatocyte growth factor receptor (MET) were assessed using quantitative realtime polymerase chain reaction on a cohort of 64 liver metastasis samples from patients with complete follow-up of 36 months and detailed clinical annotation. The most relevant mutations associated to prognosis in colorectal cancer, KRAS, and PIK3CA were assessed on the same specimens with Sanger sequencing. RESULTS Receiver operating characteristic (ROC) analysis revealed that MACC1 mRNA abundance is a good indicator of metastatic recurrence (AUC = 0.65, P < 0.05), whereas no such results were obtained with MET and HGF, nor with gene dosage. Generation of MACC1-based risk classes was capable of successfully separating patients into poor and good prognosis subgroups [hazard ratio (HR) = 5.236, 95% confidence interval (CI) = 1.2068-22.715, P < 0.05]. Also KRAS mutation was significantly associated with higher risk of recurrence (HR = 2.07, 95% CI = 1.048-4.09, P < 0.05). Cox regression multivariate analysis supported the independence of MACC1, but not KRAS, from known prognostic clinical information (Node Size HR = 3.155, 95% CI = 1.4418-6.905, P < 0.001, Preoperative carcinoembryonic antigen HR = 2.359, 95% CI = 1.0203-5.452, P < 0.05, MACC1 HR = 7.2739, 95% CI = 1.6584-31.905, P < 0.01). CONCLUSIONS MACC1, a new easily detectable biomarker in cancer, is an independent prognostic factor of recurrence after liver resection of colorectal cancer metastasis.
Collapse
|
20
|
Boeckx C, Baay M, Wouters A, Specenier P, Vermorken JB, Peeters M, Lardon F. Anti-epidermal growth factor receptor therapy in head and neck squamous cell carcinoma: focus on potential molecular mechanisms of drug resistance. Oncologist 2013; 18:850-64. [PMID: 23821327 DOI: 10.1634/theoncologist.2013-0013] [Citation(s) in RCA: 67] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022] Open
Abstract
Targeted therapy against the epidermal growth factor receptor (EGFR) is one of the most promising molecular therapeutics for head and neck squamous cell carcinoma (HNSCC). EGFR is overexpressed in a wide range of malignancies, including HNSCC, and initiates important signal transduction pathways in HNSCC carcinogenesis. However, primary and acquired resistance are serious problems and are responsible for low single-agent response rate and tumor recurrence. Therefore, an improved understanding of the molecular mechanisms of resistance to EGFR inhibitors may provide valuable indications to identify biomarkers that can be used clinically to predict response to EGFR blockade and to establish new treatment options to overcome resistance. To date, no predictive biomarker for HNSCC is available in the clinic. Therapeutic resistance to anti-EGFR therapy may arise from mechanisms that can compensate for reduced EGFR signaling and/or mechanisms that can modulate EGFR-dependent signaling. In this review, we will summarize some of these molecular mechanisms and describe strategies to overcome that resistance.
Collapse
Affiliation(s)
- Carolien Boeckx
- Center for Oncological Research Antwerp, Laboratory of Cancer Research and Clinical Oncology, University of Antwerp, Wilrijk, Belgium
| | | | | | | | | | | | | |
Collapse
|
21
|
Santos C, Vilar E, Capella G, Salazar R. Molecular markers in colorectal cancer: clinical relevance in stage II colon cancer. COLORECTAL CANCER 2013. [DOI: 10.2217/crc.13.24] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
SUMMARY Colorectal cancer is the second most common cause of cancer death in developed countries. Adjuvant chemotherapy is standard for stage III colorectal cancer but its use in stage II is controversial. Several clinicopathological factors have been described to define a high-risk group among stage II colon cancers, which can aid the selection of patients who may benefit from chemotherapy. Local tumor invasion (T4), high histological grade, obstruction and perforation at diagnosis, and number of lymph nodes removed are the most widely accepted factors. Several molecular factors have been also investigated as prognostic candidate biomarkers. DNA ploidy, KRAS and TP53 mutations, thymidylate synthase, dihydropyrimidine dehydrogenase, thymidine phosphorylase, loss of heterozygosity on chromosome 18q and microsatellite instability have been widely investigated. The aim of this review is to analyze the current evidence and clinical applications of the classical molecular biomarkers as well as new ones such as BRAF, circulating tumor cells, genome expression signatures and DNA methylation.
Collapse
Affiliation(s)
- Cristina Santos
- Department of Medical Oncology, Institut Català d’Oncologia – Institut d’Investigació Biomèdica de Bellvitge (IDIBELL), L’Hospitalet de Llobregat, Barcelona, 08907, Spain
- Translational Research Laboratory, Institut Català d’Oncologia – Institut d’Investigació Biomèdica de Bellvitge (IDIBELL), L’Hospitalet de Llobregat, Barcelona, 08907, Spain
| | - Eduardo Vilar
- Department of Clinical Cancer Prevention, The University of Texas MD Anderson Cancer Center, Houston, TX 77030, USA
| | - Gabriel Capella
- Translational Research Laboratory, Institut Català d’Oncologia – Institut d’Investigació Biomèdica de Bellvitge (IDIBELL), L’Hospitalet de Llobregat, Barcelona, 08907, Spain
| | - Ramon Salazar
- Translational Research Laboratory, Institut Català d’Oncologia – Institut d’Investigació Biomèdica de Bellvitge (IDIBELL), L’Hospitalet de Llobregat, Barcelona, 08907, Spain
- Department of Medical Oncology, Institut Català d’Oncologia – Institut d’Investigació Biomèdica de Bellvitge (IDIBELL), L’Hospitalet de Llobregat, Barcelona, 08907, Spain
| |
Collapse
|
22
|
Uzawa K, Baba T, Uchida F, Yamatoji M, Kasamatsu A, Sakamoto Y, Ogawara K, Shiiba M, Bukawa H, Tanzawa H. Circulating tumor-derived mutant mitochondrial DNA: a predictive biomarker of clinical prognosis in human squamous cell carcinoma. Oncotarget 2013; 3:670-7. [PMID: 22832574 PMCID: PMC3443250 DOI: 10.18632/oncotarget.523] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022] Open
Abstract
While circulating tumor-derived molecules have been identified in a variety of malignant tumors, it is sometimes difficult to detect the molecular targets due to the lower serum concentration. We report that evaluation of circulating tumor-derived mitochondrial DNA (mtDNA) seems to have novel efficiency for detecting tumoral micrometastasis. In murine xenografting human oral cancer cells, human mtDNAs could be quantitatively detected from multiple organs and blood samples whereas human nucleic DNAs could not. We also determined if this mtDNA blood test was relevant for patients with oral cancer with no histologic evidence of tumoral cells in their surgical margins. For this, mtDNA from normal and tumorous tissues and serum mtDNA obtained pre and postoperatively was examined at three different regions including the displacement loop, 12S-rRNA, and 16S-rRNA. All recurring patients had significantly higher amounts of mutant mtDNAs in the tumoral tissues compared with the non-recurring group. More importantly, on the blood test with the cut-off point by receiver operating characteristic (ROC) curve analysis, while the vast majority of serum mtDNA samples obtained postoperatively in the recurring cases maintained significantly higher amounts of mutant mtDNAs, the non-recurring cases did not, and they showed good prognosis. This is the first report of this approach for managing patients after resection of oral tumors, and may have substantial diagnostic potential for other tumoral types.
Collapse
Affiliation(s)
- Katsuhiro Uzawa
- Department of Clinical Molecular Biology, Graduate School of Medicine, Chiba University, Chiba, Japan.
| | | | | | | | | | | | | | | | | | | |
Collapse
|
23
|
Abd El Kader Y, Emera G, Safwat E, Kassem HA, Kassem NM. The KRAS StripAssay for detection of KRAS mutation in Egyptian patients with colorectal cancer (CRC): a pilot study. J Egypt Natl Canc Inst 2013; 25:37-41. [PMID: 23499205 DOI: 10.1016/j.jnci.2012.12.003] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/25/2012] [Revised: 12/14/2012] [Accepted: 12/31/2012] [Indexed: 02/07/2023] Open
Abstract
BACKGROUND Epidermal growth factor receptor (EGFR) and its downstream factors KRAS and BRAF are mutated in several types of cancer, affecting the clinical response to EGFR inhibitors. Mutations in the EGFR kinase domain predict sensitivity to the tyrosine kinase inhibitors gefitinib and erlotinib in lung adenocarcinoma, while activating point mutations in KRAS and BRAF confer resistance to the anti-EGFR monoclonal antibody cetuximab in colorectal cancer. The development of new generation methods for systematic mutation screening of these genes will allow more appropriate therapeutic choices. PURPOSE Detection of KRAS mutation in Egyptian colorectal cancer (CRC) patients by the KRAS StripAssay. METHODS Examination of 20 colorectal cancer (CRC) patients is done to detect KRAS mutations by KRAS StripAssay. For the StripAssay, a mutant-enriched PCR was followed by hybridization to KRAS-specific probes bound to a nitrocellulose strip. RESULTS Among 20 patients, KRAS mutations were identified in 80% of patients by the KRAS StripAssay. CONCLUSIONS Our preliminary results suggest that KRAS StripAssay is an alternative to protocols currently in use for KRAS mutation detection.
Collapse
Affiliation(s)
- Yasser Abd El Kader
- Kasr El-Aini Centre of Clinical Oncology and Nuclear Medicine (NEMROCK), Faculty of Medicine, Cairo University, Cairo, Egypt
| | | | | | | | | |
Collapse
|
24
|
de Manzini N, Leon P, Tarchi P, Giacca M. Surgical Strategy: Indications. Updates Surg 2013. [DOI: 10.1007/978-88-470-2670-4_13] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
|
25
|
Shackelford RE, Whitling NA, McNab P, Japa S, Coppola D. KRAS Testing: A Tool for the Implementation of Personalized Medicine. Genes Cancer 2012; 3:459-66. [PMID: 23264846 DOI: 10.1177/1947601912460547] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/24/2012] [Accepted: 08/14/2012] [Indexed: 12/21/2022] Open
Abstract
Activating point mutations in codons 12, 13, and 61 of the KRAS proto-oncogene are common in colorectal, non-small cell lung, pancreatic, and thyroid cancers. Constitutively activated KRAS mutations are strongly associated with a resistance to anti-epidermal growth factor receptor (EGFR) therapies, such as panitumumab and cetuximab used for treating metastatic colorectal carcinoma and EGFR tyrosine inhibitors used for advanced non-small cell lung cancers. Since anti-EGFR therapies are costly and may exert deleterious effects on individuals without activating mutations, KRAS mutation testing is recommended prior to the initiation of anti-EGFR therapy for these malignancies. The goal of this review is to summarize the KRAS mutation testing methods. Testing is now routinely requested in the clinical practice to provide data to assign the most appropriate anticancer chemotherapy for each given patient. Review of the most relevant literature was performed. Several areas were considered: ordering of the test, selection of the sample to be tested, and review of the testing methodologies. We found that several different methods are used for clinical KRAS mutation testing. Each of the methodologies is described, and information is provided about their performance, cost, turnaround times, detection limits, sensitivities, and specificities. We also provided "tips" for the appropriate selection and preparation of the sample to be tested. This is an important aspect of KRAS testing for clinical use, as the results of the test will affect clinical decisions with consequences for the patient.
Collapse
|
26
|
Abstract
BACKGROUND Mutations of the KRAS or BRAF genes are now recognized as prognostic markers for colorectal cancer (CRC). They are also important predictive markers for resistance to the monoclonal antibodies that target the epidermal growth factor receptor. METHODS In this retrospective study, KRAS and BRAF mutations were analyzed using a direct sequence method in 254 Japanese CRC patients, and the associations between KRAS or BRAF mutations and clinicopathological characteristics or outcome were evaluated. RESULTS KRAS and BRAF mutations were detected in 33.5 and 6.7 % of all patients, respectively. Consistent with previous reports, BRAF mutations were significantly correlated with the anatomical site of the tumor (P < 0.001), tumor grade (P = 0.001) and high frequency of microsatellite instability (P < 0.001). BRAF mutations were correlated with poor overall survival in the full patient cohort (P = 0.009). KRAS mutations were significantly correlated with poor recurrence-free survival (P = 0.03), particularly in patients with stage II CRC (P = 0.007). Cox regression analysis showed that KRAS mutations were a negative predictor of recurrence-free survival in patients with stage II CRC. CONCLUSION KRAS mutation status could be a novel biomarker for predicting disease recurrence in Japanese patients with stage II CRC.
Collapse
|
27
|
Peeters M, Douillard JY, Van Cutsem E, Siena S, Zhang K, Williams R, Wiezorek J. Mutant KRAS codon 12 and 13 alleles in patients with metastatic colorectal cancer: assessment as prognostic and predictive biomarkers of response to panitumumab. J Clin Oncol 2012. [PMID: 23182985 DOI: 10.1200/jco.2012.45.1492] [Citation(s) in RCA: 182] [Impact Index Per Article: 15.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023] Open
Abstract
PURPOSE Panitumumab, a fully human monoclonal antibody targeting the epidermal growth factor receptor (EGFR), has demonstrated significant improvements in progression-free survival (PFS) in patients with wild-type KRAS metastatic colorectal cancer (mCRC) in studies 20050203 (first line), 20050181 (second line), and 20020408 (monotherapy). Mutations in KRAS codons 12 and 13 are recognized biomarkers that predict lack of response to anti-EGFR antibody therapies. This retrospective analysis of three randomized phase III studies assessed the prognostic and predictive impact of individual mutant KRAS codon 12 and 13 alleles. PATIENTS AND METHODS Patients were randomly assigned 1:1 to FOLFOX4 (infusional fluorouracil, leucovorin, and oxaliplatin) in study 20050203, FOLFIRI (fluorouracil, leucovorin, and irinotecan) in study 20050181, or best supportive care in study 20020408 with or without panitumumab 6.0 mg/kg once every 2 weeks. In all, 441 (20050203), 486 (20050181), and 126 (20020408) patients with mutant KRAS codon 12 or 13 alleles were included in the analysis. RESULTS No mutant KRAS allele in patients treated on the control arm emerged as a consistent prognostic factor for PFS or overall survival (OS). In addition, no mutant KRAS allele was consistently identified as a predictive factor for PFS or OS in patients receiving panitumumab treatment. Significant interactions for individual mutant KRAS alleles were observed only in study 20050203 with G13D negatively and G12V positively associated with OS in the panitumumab-containing arm. Pooled analysis indicated that only G12A was associated with a negative predictive effect on OS. CONCLUSION In this retrospective analysis, results across three treatment regimens suggest that patients with mutant KRAS codon 12 or 13 mCRC tumors are unlikely to benefit from panitumumab therapy. Currently, panitumumab therapy should be limited to patients with wild-type KRAS mCRC.
Collapse
Affiliation(s)
- Marc Peeters
- Department of Oncology, Antwerp University Hospital, Edegem, Belgium.
| | | | | | | | | | | | | |
Collapse
|
28
|
Montomoli J, Hamilton-Dutoit SJ, Frøslev T, Taylor A, Erichsen R. Retrospective analysis of KRAS status in metastatic colorectal cancer patients: a single-center feasibility study. Clin Exp Gastroenterol 2012; 5:167-71. [PMID: 23028236 PMCID: PMC3449754 DOI: 10.2147/ceg.s34725] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/17/2012] [Indexed: 12/12/2022] Open
Abstract
Background: The occurrence of KRAS mutations and their association with prognosis in metastatic colorectal cancer patients is not well documented in population-based studies. Objectives: To examine the feasibility of identifying archived colorectal cancer specimens, and through linkage with nationwide Danish population-based databases to investigate the prevalence of KRAS mutations and their association with colorectal cancer survival. Methods: We used the Danish Pathology Database to identify the physical location of primary (or in some cases secondary) tumor specimens from selected metastatic colorectal cancer patients referred to our hospital for palliative chemotherapy between November 1, 2008 and September 30, 2009. Routinely stored paraffin tissue blocks were obtained from the pathology archives of the originating hospital. KRAS mutation tumor status was assessed for each patient using the commercialized TheraScreen KRAS Mutation Kit. Using the unique identifier number, we linked the patients to the Danish National Registry of Patients and the Danish Civil Registration System to obtain data on date of first colorectal cancer diagnosis and follow-up status. We estimated prevalence of KRAS mutations and the 1-, 2-, and 5-year survival after colorectal cancer diagnosis using the Kaplan–Meier technique. Results: We identified 106 metastatic colorectal cancer patients (64% males). All were successfully linked to the registries, and archived tumor-tissue samples were obtained and analyzed in each case. The overall prevalence of KRAS mutations was 55%, and 1-, 2-, and 5-year overall survival after colorectal cancer diagnosis was 91%, 68%, and 25%, respectively. Conclusion: It is feasible to use Danish population-based registries to obtain archived tissue samples from metastatic colorectal cancer patients, and to estimate prevalence of KRAS mutation and subsequently evaluate the association with colorectal cancer survival.
Collapse
Affiliation(s)
- Jonathan Montomoli
- Department of Clinical Epidemiology, Aarhus University Hospital, Aarhus, Denmark
| | | | | | | | | |
Collapse
|
29
|
MIZUTANI NAOKI, ITO HIROMI, HAGIWARA KAZUMI, KOBAYASHI MISA, HOSHIKAWA ASUKA, NISHIDA YAYOI, TAKAGI AKIRA, KOJIMA TETSUHITO, SUZUKI MOTOSHI, OSAWA YOSUKE, OHNISHI KAZUNORI, DAIBATA MASANORI, MURATE TAKASHI. Involvement of KRAS G12A mutation in the IL-2-independent growth of a human T-LGL leukemia cell line, PLT-2. NAGOYA JOURNAL OF MEDICAL SCIENCE 2012; 74:261-71. [PMID: 23092099 PMCID: PMC4831235] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
Abstract
Cytokine-dependent cell lines have been used to analyze the cytokine-induced cellular signaling and the mechanism of oncogenesis. In the current study, we analyzed MOTN-1 and PLT-2 cell lines established from different stages of a T-cell large granular lymphocyte leukemia patient (Daibata et al. 2004). MOTN-1 is IL-2-dependent derived from the chronic phase, whereas IL-2-independent PLT-2 is from the aggressive and terminal stage. They shared considerable chromosome abnormalities and the pattern of T-cell receptor rearrangement, presuming that the cytokine independence of PLT-2 was due to the additive genetic abnormality. Besides IL-2, IL-15 supported MOTN-1 cell growth, because these receptors share beta- and gamma-subunits. IL-2 activated ERK, AKT and STAT pathway of MOTN-1. STAT3 pathway of PLT-2 was also activated by IL-2, suggesting intact IL-2 induces signal transduction of PLT-2. However, ERK1/2 but not AKT, was continuously activated in PLT-2, consistent with the increased Ras-activity of PLT-2. Sequence analysis revealed KRAS G12A mutation but not NRAS and HRAS mutation of PLT-2 but not MOTN-1. Another signaling molecule affecting Ras-signaling pathway, SHP2, which has been frequently mutated in juvenile myelomonocytic leukemia (JMML), did not show mutation. Moreover, MEK inhibitor, PD98059, as well as farnesylation inhibitor inhibited PLT-2 cell growth. Using NIH3T3 and MOTN-1, ERK activation, increased cell proliferation and survival by KRAS G12A were shown, suggesting the important role of KRAS G12A in IL-2-independent growth of PLT-2. Taken together, KRAS G12A is important for IL-2-independent growth of PLT-2 cells and suggests the possibility of involvement of KRAS mutation with disease progression.
Collapse
Affiliation(s)
- NAOKI MIZUTANI
- Division of Pathophysiological Laboratory Sciences, Department of Radiological and Medical Laboratory Sciences, Nagoya University Graduate School of Medicine, Nagoya, Japan
| | - HIROMI ITO
- Division of Pathophysiological Laboratory Sciences, Department of Radiological and Medical Laboratory Sciences, Nagoya University Graduate School of Medicine, Nagoya, Japan
| | - KAZUMI HAGIWARA
- Division of Pathophysiological Laboratory Sciences, Department of Radiological and Medical Laboratory Sciences, Nagoya University Graduate School of Medicine, Nagoya, Japan
| | - MISA KOBAYASHI
- Division of Pathophysiological Laboratory Sciences, Department of Radiological and Medical Laboratory Sciences, Nagoya University Graduate School of Medicine, Nagoya, Japan
| | - ASUKA HOSHIKAWA
- Division of Pathophysiological Laboratory Sciences, Department of Radiological and Medical Laboratory Sciences, Nagoya University Graduate School of Medicine, Nagoya, Japan
| | - YAYOI NISHIDA
- Division of Pathophysiological Laboratory Sciences, Department of Radiological and Medical Laboratory Sciences, Nagoya University Graduate School of Medicine, Nagoya, Japan
| | - AKIRA TAKAGI
- Division of Pathophysiological Laboratory Sciences, Department of Radiological and Medical Laboratory Sciences, Nagoya University Graduate School of Medicine, Nagoya, Japan
| | - TETSUHITO KOJIMA
- Division of Pathophysiological Laboratory Sciences, Department of Radiological and Medical Laboratory Sciences, Nagoya University Graduate School of Medicine, Nagoya, Japan
| | - MOTOSHI SUZUKI
- Division of Molecular Carcinogenesis, Nagoya University Graduate School of Medicine, Nagoya, Japan
| | - YOSUKE OSAWA
- Department of Informative Clinical Medicine, Gifu Graduate School of Medicine, Gifu, Japan
| | - KAZUNORI OHNISHI
- Oncology Center, Hamamatsu University Graduate School of Medicine, Hamamatsu, Japan
| | - MASANORI DAIBATA
- Department of Microbiology and Infection, Kochi University Graduate School of Medicine, Nangoku, Japan
| | - TAKASHI MURATE
- Division of Pathophysiological Laboratory Sciences, Department of Radiological and Medical Laboratory Sciences, Nagoya University Graduate School of Medicine, Nagoya, Japan
| |
Collapse
|
30
|
KUNO TAKASHI, MATSUBARA NAGAHIDE, TSUDA SATOSHI, KOBAYASHI MASAYOSHI, HAMANAKA MIE, YAMAGISHI DAISUKE, TSUKAMOTO KIYOSHI, YAMANO TOMOKI, NODA MASAFUMI, IKEUCHI HIROKI, KIM SANGHYUK, TAMURA KAZUO, TOMITA NAOHIRO. Alterations of the base excision repair gene MUTYH in sporadic colorectal cancer. Oncol Rep 2012; 28:473-80. [DOI: 10.3892/or.2012.1836] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2012] [Accepted: 04/23/2012] [Indexed: 11/06/2022] Open
|
31
|
KRAS mutation detection by high-resolution melting analysis significantly predicts clinical benefit of cetuximab in metastatic colorectal cancer. Br J Cancer 2012; 107:626-31. [PMID: 22805329 PMCID: PMC3419946 DOI: 10.1038/bjc.2012.275] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022] Open
Abstract
Background: Anti-epidermal growth factor receptor (EGFR) monoclonal antibodies are restricted to KRAS wild-type (WT) metastatic colorectal cancers (mCRCs), usually identified by direct sequencing, that may yield false negative results because of genetic heterogeneity within the tumour. We evaluated the efficiency of high-resolution melting analysis (HRMA) in identifying KRAS-mutant (MUT) tumours. Methods: We considered 50 mCRC patients scored as KRAS-WT by direct sequencing and treated with cetuximab-containing chemotherapy, and tested the correlations between HRMA findings and response rate (RR), progression-free (PFS) and overall survival (OS). Results: Aberrant melting curves were detected in four (8%) cases; gene cloning confirmed these mutations. Response rate (RR) of HRMA KRAS-WT patients was 28.3%. There was no response in HRMA KRAS-MUT patients. Disease control rate (responsive plus stable disease) was 58.7% in HRMA KRAS-WT patients and 25% in HRMA KRAS-MUT patients. There was no correlation between HRMA KRAS status and RR (P=0.287) or disease control (P=0.219). Median PFS (4.8 vs 2.3 months; hazard ratio (HR)=0.29, P=0.02) and OS (11.0 vs 2.7 months; HR=0.11, P=0.03) were significantly longer for the HRMA KRAS-WT than for HRMA KRAS-MUT patients. Conclusions: High-resolution melting analysis identified 8% more KRAS-MUT patients not responding to cetuximab-containing regimens, suggesting that HRMA may be more effective than direct sequencing in selecting patients for anti-EGFR antibodies.
Collapse
|
32
|
Involvement of K-RAS mutations and amino acid substitutions in the survival of metastatic colorectal cancer patients. Tumour Biol 2012; 33:1829-35. [PMID: 22791568 DOI: 10.1007/s13277-012-0442-z] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/17/2012] [Accepted: 06/10/2012] [Indexed: 02/06/2023] Open
Abstract
The efficacy of epidermal growth factor-targeting therapies has been found to be limited in tumors with the wild-type K-RAS gene, suggesting a predictive value of K-RAS gene analysis in tumoral response. However, the prognostic value of K-RAS is controversial. This study included patients diagnosed with metastatic colorectal cancer. The presence of K-RAS mutations was analyzed, and the tumors positive for a K-RAS mutation were further analyzed to identify the mutation type. Similarly, the following clinical and pathological variables were also collected. The study was composed of 53.3 % of patients with wild-type K-RAS and 46.7 % of patients with mutated K-RAS (mutated codon 12 was the most frequent). With a mean follow-up of 15 months (range, 1-45), the median survival of patients with wild-type K-RAS was 31.6 months. The median survival was 24.8 months for patients with K-RAS mutated in codon 12 and 17.8 months for patients with mutated codon 13 (p = 0.37). In a univariate analysis, K-RAS was associated with stage IV at diagnosis (p < 0.005). When K-RAS was mutated, a lower overall survival was observed in cases of G → A transition compared with G → T transversion (19.5 vs. 24.2 months, respectively; p = 0.47). When the amino acid change resulted in an acidic substitution, survival was lower, but it increased when the substitution resulted in a polar or nonpolar amino acid (19.5 vs. 23.2 vs. 24.4 months, p = 0.79). The type of K-RAS mutation or amino acid changes may have prognostic implications in metastatic colon cancer patients. Further research is needed in patients treated in prospective controlled trials.
Collapse
|
33
|
Botezatu IV, Zhordaniya KI, Karseladze AI, Stroganova AM, Kondratova VN, Shelepov VP, Telkov MV, Lichtenstein AV. Scanning of mutations in short amplicons: Optimization of DNA melting method. Mol Biol 2012. [DOI: 10.1134/s0026893312030028] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
|
34
|
Yang QH, Schmidt J, Soucy G, Odze R, Dejesa-Jamanila L, Arnold K, Kuslich C, Lash R. KRAS mutational status of endoscopic biopsies matches resection specimens. J Clin Pathol 2012; 65:604-7. [DOI: 10.1136/jclinpath-2012-200746] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
AimsThis study was performed to determine systematically whether KRAS mutational analysis in biopsy tissue is a reliable indicator of KRAS status in subsequent corresponding resection specimens.Methods30 colorectal cancer (CRC) patients with biopsy and corresponding subsequent surgical resection specimens were studied. KRAS mutational analysis was performed on each biopsy sample as well as two separate samples from each resection specimen by PCR and Sanger sequencing.ResultsOverall, KRAS mutations were identified in 12/30 (40%) of the tumours. There was 100% correlation between biopsy and resection specimens regarding the presence or absence of KRAS mutations. In fact, the same point mutation was identified in both biopsy and corresponding resection specimens in 12/12 (100%) cases. In addition, in two cases, there were two different point mutations detected within the same biopsy specimen.ConclusionThis study shows perfect correlation between KRAS mutation status in biopsy and resection specimens from an individual patient, and suggests that biopsy material is adequate for KRAS mutational analysis in CRC patients.
Collapse
|
35
|
Botezatu IV, Kondratova VN, Shelepov VP, Lichtenstein AV. DNA melting analysis: Application of the “open tube” format for detection of mutant KRAS. Anal Biochem 2011; 419:302-8. [DOI: 10.1016/j.ab.2011.08.015] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/06/2011] [Revised: 08/07/2011] [Accepted: 08/10/2011] [Indexed: 10/17/2022]
|
36
|
Abstract
Somatic, gain-of-function mutations in ras genes were the first specific genetic alterations identified in human cancer about 3 decades ago. Studies during the last quarter century have characterized the Ras proteins as essential components of signaling networks controlling cellular proliferation, differentiation, or survival. The oncogenic mutations of the H-ras, N-ras, or K-ras genes frequently found in human tumors are known to throw off balance the normal outcome of those signaling pathways, thus leading to tumor development. Oncogenic mutations in a number of other upstream or downstream components of Ras signaling pathways (including membrane RTKs or cytosolic kinases) have been detected more recently in association with a variety of cancers. Interestingly, the oncogenic Ras mutations and the mutations in other components of Ras/MAPK signaling pathways appear to be mutually exclusive events in most tumors, indicating that deregulation of Ras-dependent signaling is the essential requirement for tumorigenesis. In contrast to sporadic tumors, separate studies have identified germline mutations in Ras and various other components of Ras signaling pathways that occur in specific association with a number of different familial, developmental syndromes frequently sharing common phenotypic cardiofaciocutaneous features. Finally, even without being a causative force, defective Ras signaling has been cited as a contributing factor to many other human illnesses, including diabetes and immunological and inflammatory disorders. We aim this review at summarizing and updating current knowledge on the contribution of Ras mutations and altered Ras signaling to development of various tumoral and nontumoral pathologies.
Collapse
|