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Zhou H, Liu Z, Wang Y, Wen X, Amador EH, Yuan L, Ran X, Xiong L, Ran Y, Chen W, Wen Y. Colorectal liver metastasis: molecular mechanism and interventional therapy. Signal Transduct Target Ther 2022; 7:70. [PMID: 35246503 PMCID: PMC8897452 DOI: 10.1038/s41392-022-00922-2] [Citation(s) in RCA: 112] [Impact Index Per Article: 56.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/17/2021] [Revised: 01/25/2022] [Accepted: 02/09/2022] [Indexed: 02/08/2023] Open
Abstract
Colorectal cancer (CRC) is one of the most frequently occurring malignancy tumors with a high morbidity additionally, CRC patients may develop liver metastasis, which is the major cause of death. Despite significant advances in diagnostic and therapeutic techniques, the survival rate of colorectal liver metastasis (CRLM) patients remains very low. CRLM, as a complex cascade reaction process involving multiple factors and procedures, has complex and diverse molecular mechanisms. In this review, we summarize the mechanisms/pathophysiology, diagnosis, treatment of CRLM. We also focus on an overview of the recent advances in understanding the molecular basis of CRLM with a special emphasis on tumor microenvironment and promise of newer targeted therapies for CRLM, further improving the prognosis of CRLM patients.
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Affiliation(s)
- Hui Zhou
- Department of General Surgery, Second Xiangya Hospital, Central South University, Changsha, 410011, Hunan Province, China
| | - Zhongtao Liu
- Department of General Surgery, Second Xiangya Hospital, Central South University, Changsha, 410011, Hunan Province, China
| | - Yongxiang Wang
- Department of General Surgery, Second Xiangya Hospital, Central South University, Changsha, 410011, Hunan Province, China
| | - Xiaoyong Wen
- Department of General Surgery, Second Xiangya Hospital, Central South University, Changsha, 410011, Hunan Province, China
| | - Eric H Amador
- Department of Physics, The University of Texas, Arlington, TX, 76019, USA
| | - Liqin Yuan
- Department of General Surgery, Second Xiangya Hospital, Central South University, Changsha, 410011, Hunan Province, China
| | - Xin Ran
- Department of Dermatovenereology, West China Hospital, Sichuan University, Chengdu, Sichuan Province, China
| | - Li Xiong
- Department of General Surgery, Second Xiangya Hospital, Central South University, Changsha, 410011, Hunan Province, China.
| | - Yuping Ran
- Department of Dermatovenereology, West China Hospital, Sichuan University, Chengdu, Sichuan Province, China
| | - Wei Chen
- Department of Physics, The University of Texas, Arlington, TX, 76019, USA.
- Medical Technology Research Centre, Chelmsford Campus, Anglia Ruskin University, Chelmsford, CM1 1SQ, UK.
| | - Yu Wen
- Department of General Surgery, Second Xiangya Hospital, Central South University, Changsha, 410011, Hunan Province, China.
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Samoon Z, Naher SK, Sjoquist KM, Zalcberg J. Chemotherapy in resectable or potentially resectable colon cancer with liver metastases. Expert Opin Pharmacother 2022; 23:663-672. [PMID: 35196945 DOI: 10.1080/14656566.2022.2043276] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
INTRODUCTION The treatment of colorectal cancer liver metastases has seen significant improvement in recent years and, for certain patients, the long-term survival and even cure are possible. Despite this improvement, many more questions are yet to be answered: the optimal combination, duration, sequence of therapies, role of biologics and the timing of surgical resection are debated in the literature, with conflicting trial results. AREAS COVERED In this review, the authors highlight the current trial evidence for systemic chemotherapy and biologic therapy for colorectal cancer liver metastases in both the pre and post-resection setting. EXPERT OPINION The treatment of colorectal liver metastases requires a multidisciplinary approach. The role of adjuvant chemotherapy with 5 fluorouracil and oxaliplatin in stage 3 colon cancer is well established. However, the options for patients with resectable or borderline liver metastases, either in the neoadjuvant or adjuvant settings, require further study. For patients with borderline resectable metastases, the combination of triplet chemotherapy with 5 fluorouracil, oxaliplatin and irinotecan (FOLFOXIRI) offers the best conversion rate. The role of biologic agents such as bevacizumab and EGFR inhibitors in these settings is less clear based on current evidence.
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Affiliation(s)
- Zarka Samoon
- The Crown Princess Mary Cancer Care Centre, Medical Oncology Clinical Trials Unit, Westmead Hospital, NSW, Australia
| | - Sayeda Kamrun Naher
- National Health and Medical Research Council Clinical Trials Centre (NHMRC CTC), University of Sydney, Campbelltown, NSW, Australia
| | - Katrin M Sjoquist
- National Health and Medical Research Council Clinical Trials Centre (NHMRC CTC), University of Sydney, Campbelltown, NSW, Australia
| | - John Zalcberg
- Cancer Research Program, School of Public Health and Preventive Medicine, Faculty of Medicine, Monash University, Melbourne, Australia
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Immune Contexture of MMR-Proficient Primary Colorectal Cancer and Matched Liver and Lung Metastases. Cancers (Basel) 2021; 13:cancers13071530. [PMID: 33810354 PMCID: PMC8037224 DOI: 10.3390/cancers13071530] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2021] [Revised: 03/12/2021] [Accepted: 03/24/2021] [Indexed: 12/24/2022] Open
Abstract
Simple Summary Metastasis is the main cause for cancer mortality. The most common metastatic sites of colorectal cancer (CRC) are the liver and lungs. Tumour-infiltrating lymphocytes are recognized as beneficial prognostic factors both in primary and metastatic CRC, but less is known about their reciprocal differences. The aim of our study was to evaluate immune microenvironment and its prognostic value in a series of mismatch proficient (pMMR) CRC with matched liver and lung metastases. The proportion of tumours with high immune cell infiltration together with PD-L1-positivity almost doubled in metastases compared to primary tumours. Our study confirmed the prognostic value of high ICS in least immune-infiltrated metastases in pMMR CRC patients. Major differences observed in immune contexture between primary tumours and metastases may have significance for treatment strategies for patients with advanced CRC. Abstract Purpose: To evaluate immune cell infiltration, the programmed death-1/programmed death ligand-1 (PD-1/PD-L1) expression and their prognostic value in a series of mismatch proficient (pMMR) CRC with matched liver and lung metastases. Methods: Formalin-fixed paraffin-embedded tissue sections stained for CD3, CD8, PD-L1 and PD-1 from 113 primary CRC tumours with 105 liver and 59 lung metastases were analyzed. The amount of CD3 and CD8 positive lymphocytes were combined as immune cell score (ICS). Comparative analyses on immune contexture were performed both between the primary tumour and matched metastases and between the metastatic sites. Results: In liver metastases, immune cell infiltration was increased in general compared to primary tumours but did not correlate case by case. On the contrary, ICS between lung metastases and primary tumours correlated well, but the expression of PD-1/PD-L1 was increased in lung metastases. The proportion of tumours with high ICS together with PD-L1-positivity almost doubled in metastases (39%) compared to primary tumours (20%). High ICS (compared to lowest) in patient’s least immune-infiltrated metastasis was an independent prognostic marker for disease-specific (HR 9.14, 95%CI 2.81–29.68) and overall survival (HR 6.95, 95%CI 2.30–21.00). Conclusions: Our study confirms the prognostic value of high ICS in least immune-infiltrated metastases in pMMR CRC patients. Major differences observed in immune contexture between primary tumours and metastases may have significance for treatment strategies for patients with advanced CRC.
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Prognostic implications of EGFR protein expression in sporadic colorectal tumors: Correlation with copy number status, mRNA levels and miRNA regulation. Sci Rep 2020; 10:4662. [PMID: 32170146 PMCID: PMC7070091 DOI: 10.1038/s41598-020-61688-7] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2019] [Accepted: 02/26/2020] [Indexed: 11/10/2022] Open
Abstract
Sporadic colorectal cancer (sCRC) is the third most frequent cancer worldwide and the second most common cause of cancer-related deaths (mainly due metastatic dissemination). We investigated the immunohistochemical expression of frequently altered proteins in primary tumors from 51 patients (25 liver metastatic and 26 non-metastatic cases) with a median 103 months follow-up (103 months). We evaluated EGFR copy number (using SNP arrays and FISH) and its expression and regulation (by mRNA and miRNA arrays). We found differences between metastatic and non-metastatic sCRCs for MLH1 (p = 0.05), PMS2 (p = 0.02), CEA (p < 0.001) and EGFR (p < 0.001) expression. EGFR expression was associated with lymph node metastases (p = 0.001), liver metastases at diagnosis (p < 0.001), and advanced stage (p < 0.001). There were associations between EGFR expression-, EGFR gene copy number- and EGFR mRNA levels. We found potential interactions of two miRNAs targeting EGFR expression, (miR-134 and miR-4328, in non-metastatic and metastatic tumors, respectively). EGFR expression was associated with a worse outcome (p = 0.005). Multivariate analysis of prognostic factors for overall survival identified that, the expression of EGFR expression (p = 0.047) and pTNM stage (p < 0.001) predicted an adverse outcome. EGFR expression could be regulated by amplification or polysomies (in metastatic tumors), or miRNAs (miRNA-134, in non-metastatic tumors). EGFR expression in sCRC appears to be related to metastases and poor outcome.
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Prasanna T, Karapetis CS, Roder D, Tie J, Padbury R, Price T, Wong R, Shapiro J, Nott L, Lee M, Chua YJ, Craft P, Piantadosi C, Sorich M, Gibbs P, Yip D. The survival outcome of patients with metastatic colorectal cancer based on the site of metastases and the impact of molecular markers and site of primary cancer on metastatic pattern. Acta Oncol 2018. [DOI: 10.1080/0284186x.2018.1487581 10.1080/0284186x.2018.1487581] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Affiliation(s)
- Thiru Prasanna
- Department of Medical Oncology, The Canberra Hospital, Garran, Canberra, Australia
| | - Christos S. Karapetis
- Department of Medical Oncology, Flinders Medical Centre, Bedford Park, Australia
- Flinders Clinical and Molecular Medicine, Surgery, Flinders University, Bedford Park, Australia
| | - David Roder
- South Australian Health & Medical Research Institute (SAHMRI), Adelaide, Australia
- School of Health Sciences, University of South Australia, Adelaide, Australia
| | - Jeanne Tie
- Department of Medical Oncology, Western Hospital, Melbourne, Australia
- Walter and Eliza Hall Institute of Medical Research, Melbourne, Australia
- Department of Medical Oncology, Peter MacCallum Cancer Centre, Melbourne, Australia
| | - Robert Padbury
- Flinders Clinical and Molecular Medicine, Surgery, Flinders University, Bedford Park, Australia
- Department of Surgery, Flinders Medical Centre, Adelaide, Australia
| | - Timothy Price
- The Queen Elizabeth Hospital and University of Adelaide, Adelaide, Australia
| | - Rachel Wong
- Walter and Eliza Hall Institute of Medical Research, Melbourne, Australia
- Department of Medical Oncology, Eastern Health, Melbourne, Australia
- Faculty of Medicine, Nursing and Health Sciences, Monash University, Melbourne, Australia
| | - Jeremy Shapiro
- Cabrini Haematology and Oncology Centre, Melbourne, Australia
| | - Louise Nott
- Department of Medical Oncology, Royal Hobart Hospital, Tasmania, Australia
- Menzies Research Institute, Hobart, Australia
| | - Margaret Lee
- Walter and Eliza Hall Institute of Medical Research, Melbourne, Australia
- Department of Medical Oncology, Eastern Health, Melbourne, Australia
| | - Yu Jo Chua
- Department of Medical Oncology, The Canberra Hospital, Garran, Canberra, Australia
- ANU Medical School, Australian National University, Canberra, Australia
| | - Paul Craft
- Department of Medical Oncology, The Canberra Hospital, Garran, Canberra, Australia
- ANU Medical School, Australian National University, Canberra, Australia
| | | | - Michael Sorich
- College of Medicine and Public Health, Flinders University, Adelaide, Australia
| | - Peter Gibbs
- Department of Medical Oncology, Western Hospital, Melbourne, Australia
- Walter and Eliza Hall Institute of Medical Research, Melbourne, Australia
| | - Desmond Yip
- Department of Medical Oncology, The Canberra Hospital, Garran, Canberra, Australia
- ANU Medical School, Australian National University, Canberra, Australia
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Prasanna T, Karapetis CS, Roder D, Tie J, Padbury R, Price T, Wong R, Shapiro J, Nott L, Lee M, Chua YJ, Craft P, Piantadosi C, Sorich M, Gibbs P, Yip D. The survival outcome of patients with metastatic colorectal cancer based on the site of metastases and the impact of molecular markers and site of primary cancer on metastatic pattern. Acta Oncol 2018; 57:1438-1444. [PMID: 30035653 DOI: 10.1080/0284186x.2018.1487581] [Citation(s) in RCA: 70] [Impact Index Per Article: 11.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
BACKGROUND Pattern of spread in patients with metastatic colorectal cancer (mCRC) is variable and may reflect different biology in subsets of patients. This is a retrospective study to explore the outcome of patients with mCRC based on their site of metastasis at diagnosis and to explore the association between tumor characteristics [KRAS/RAS, BRAF, mismatch repair (MMR) status, site of primary] and the site of metastasis. METHODS Patients from two Australian databases were divided into six groups based on site of metastasis at time of diagnosis of metastatic disease; lung-only, liver-only, lymph node-only or any patients with brain, bone or peritoneal metastases. Primary endpoint was overall survival (OS) of each cohort compared with the rest of the population. A Mantel-Haenszel chi-squared test used to explore the association between site of metastasis and selected tumor characteristics. RESULTS Five thousand nine hundred and sixty-seven patients were included. In a univariate analysis, median OS was significantly higher when metastases were limited to lung or liver and shorter for those with brain, bone or peritoneal metastases (p < .001) in both datasets. BRAF mutation was strongly associated with peritoneal metastases (relative risk = 1.8, p < .001) with lower incidence of lung (RR = 0.3, p = .004) and liver (RR = 0.7, p = .005) limited metastases. Lung-only metastases were more frequent with KRAS/RAS mutation (RR = 1.4, p = .007). Left colon tumors were associated with bone (RR = 1.6, p < .001) and lung-only metastases (RR = 2.3, p = .001) while peritoneal spread was less frequent compared with right colon tumors (RR = 0.6, p < .001). Rectal cancer was associated with brain, bone and lung metastases (RR = 1.7; p = .002, 1.7; p < .001, 2.0; p < .001). Liver-only metastases were less frequent in deficient MMR tumors (RR = 0.7, p = .01). CONCLUSION Survival duration with mCRC is related to the site of metastases with lung limited disease showing a more favorable survival outcome compared to other single metastatic site disease. The BRAF mutation and primary rectal cancer were associated with poor prognostic metastatic sites.
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Affiliation(s)
- Thiru Prasanna
- Department of Medical Oncology, The Canberra Hospital, Garran, Canberra, Australia
| | - Christos S. Karapetis
- Department of Medical Oncology, Flinders Medical Centre, Bedford Park, Australia
- Flinders Clinical and Molecular Medicine, Surgery, Flinders University, Bedford Park, Australia
| | - David Roder
- South Australian Health & Medical Research Institute (SAHMRI), Adelaide, Australia
- School of Health Sciences, University of South Australia, Adelaide, Australia
| | - Jeanne Tie
- Department of Medical Oncology, Western Hospital, Melbourne, Australia
- Walter and Eliza Hall Institute of Medical Research, Melbourne, Australia
- Department of Medical Oncology, Peter MacCallum Cancer Centre, Melbourne, Australia
| | - Robert Padbury
- Flinders Clinical and Molecular Medicine, Surgery, Flinders University, Bedford Park, Australia
- Department of Surgery, Flinders Medical Centre, Adelaide, Australia
| | - Timothy Price
- The Queen Elizabeth Hospital and University of Adelaide, Adelaide, Australia
| | - Rachel Wong
- Walter and Eliza Hall Institute of Medical Research, Melbourne, Australia
- Department of Medical Oncology, Eastern Health, Melbourne, Australia
- Faculty of Medicine, Nursing and Health Sciences, Monash University, Melbourne, Australia
| | - Jeremy Shapiro
- Cabrini Haematology and Oncology Centre, Melbourne, Australia
| | - Louise Nott
- Department of Medical Oncology, Royal Hobart Hospital, Tasmania, Australia
- Menzies Research Institute, Hobart, Australia
| | - Margaret Lee
- Walter and Eliza Hall Institute of Medical Research, Melbourne, Australia
- Department of Medical Oncology, Eastern Health, Melbourne, Australia
| | - Yu Jo Chua
- Department of Medical Oncology, The Canberra Hospital, Garran, Canberra, Australia
- ANU Medical School, Australian National University, Canberra, Australia
| | - Paul Craft
- Department of Medical Oncology, The Canberra Hospital, Garran, Canberra, Australia
- ANU Medical School, Australian National University, Canberra, Australia
| | | | - Michael Sorich
- College of Medicine and Public Health, Flinders University, Adelaide, Australia
| | - Peter Gibbs
- Department of Medical Oncology, Western Hospital, Melbourne, Australia
- Walter and Eliza Hall Institute of Medical Research, Melbourne, Australia
| | - Desmond Yip
- Department of Medical Oncology, The Canberra Hospital, Garran, Canberra, Australia
- ANU Medical School, Australian National University, Canberra, Australia
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Zhou G, Noordam L, Sprengers D, Doukas M, Boor PPC, van Beek AA, Erkens R, Mancham S, Grünhagen D, Menon AG, Lange JF, Burger PJWA, Brandt A, Galjart B, Verhoef C, Kwekkeboom J, Bruno MJ. Blockade of LAG3 enhances responses of tumor-infiltrating T cells in mismatch repair-proficient liver metastases of colorectal cancer. Oncoimmunology 2018; 7:e1448332. [PMID: 29900067 PMCID: PMC5993483 DOI: 10.1080/2162402x.2018.1448332] [Citation(s) in RCA: 55] [Impact Index Per Article: 9.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2017] [Revised: 02/26/2018] [Accepted: 02/28/2018] [Indexed: 02/06/2023] Open
Abstract
Purpose: Liver metastasis develops in >50% of patients with colorectal cancer (CRC), and is a leading cause of CRC-related mortality. We aimed to identify which inhibitory immune checkpoint pathways can be targeted to enhance functionality of intra-tumoral T-cells in mismatch repair-proficient liver metastases of colorectal cancer (LM-CRC). Methodology: Intra-tumoral expression of multiple inhibitory molecules was compared among mismatch repair-proficient LM-CRC, peritoneal metastases of colorectal cancer (PM-CRC) and primary CRC. Expression of inhibitory molecules was also analyzed on leukocytes isolated from paired resected metastatic liver tumors, tumor-free liver tissues, and blood of patients with mismatch repair-proficient LM-CRC. The effects of blocking inhibitory pathways on tumor-infiltrating T-cell responses were studied in ex vivo functional assays. Results: Mismatch repair-proficient LM-CRC showed higher expression of inhibitory receptors on intra-tumoral T-cells and contained higher proportions of CD8+ T-cells, dendritic cells and monocytes than mismatch repair-proficient primary CRC and/or PM-CRC. Inhibitory receptors LAG3, PD-1, TIM3 and CTLA4 were higher expressed on CD8+ T-cells, CD4+ T-helper and/or regulatory T-cells in LM-CRC tumors compared with tumor-free liver and blood. Antibody blockade of LAG3 or PD-L1 increased proliferation and effector cytokine production of intra-tumoral T-cells isolated from LM-CRC in response to both polyclonal and autologous tumor-specific stimulations. Higher LAG3 expression on intra-tumoral CD8+ T-cells associated with longer progression-free survival of LM-CRC patients. Conclusion: Mismatch repair-proficient LM-CRC may be more sensitive to immune checkpoint inhibitors than mismatch repair-proficient primary CRC. Blocking LAG3 enhances tumor-infiltrating T-cell responses of mismatch repair-proficient LM-CRC, and therefore may be a new promising immunotherapeutic target for LM-CRC.
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Affiliation(s)
- Guoying Zhou
- Departments of Gastroenterology and Hepatology, Erasmus MC-University Medical Center, Rotterdam, the Netherlands
| | - Lisanne Noordam
- Departments of Gastroenterology and Hepatology, Erasmus MC-University Medical Center, Rotterdam, the Netherlands
| | - Dave Sprengers
- Departments of Gastroenterology and Hepatology, Erasmus MC-University Medical Center, Rotterdam, the Netherlands
| | - Michail Doukas
- Department of Pathology, Erasmus MC-University Medical Center, Rotterdam, the Netherlands
| | - Patrick P C Boor
- Departments of Gastroenterology and Hepatology, Erasmus MC-University Medical Center, Rotterdam, the Netherlands
| | - Adriaan A van Beek
- Departments of Gastroenterology and Hepatology, Erasmus MC-University Medical Center, Rotterdam, the Netherlands
| | - Remco Erkens
- Departments of Gastroenterology and Hepatology, Erasmus MC-University Medical Center, Rotterdam, the Netherlands
| | - Shanta Mancham
- Departments of Gastroenterology and Hepatology, Erasmus MC-University Medical Center, Rotterdam, the Netherlands
| | - Dirk Grünhagen
- Department of Surgery, Erasmus MC-University Medical Center, Rotterdam, the Netherlands
| | - Anand G Menon
- Department of Surgery, Havenziekenhuis and IJsselland Hospital, Rotterdam, the Netherlands
| | - Johan F Lange
- Department of Surgery, Erasmus MC-University Medical Center, Rotterdam, the Netherlands
| | - Pim J W A Burger
- Department of Surgery, Erasmus MC-University Medical Center, Rotterdam, the Netherlands
| | - Alexandra Brandt
- Department of Surgery, Erasmus MC-University Medical Center, Rotterdam, the Netherlands
| | - Boris Galjart
- Department of Surgery, Erasmus MC-University Medical Center, Rotterdam, the Netherlands
| | - Cornelis Verhoef
- Department of Surgery, Erasmus MC-University Medical Center, Rotterdam, the Netherlands
| | - Jaap Kwekkeboom
- Departments of Gastroenterology and Hepatology, Erasmus MC-University Medical Center, Rotterdam, the Netherlands
| | - Marco J Bruno
- Departments of Gastroenterology and Hepatology, Erasmus MC-University Medical Center, Rotterdam, the Netherlands
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Yamashita S, Chun YS, Kopetz SE, Vauthey JN. Biomarkers in colorectal liver metastases. Br J Surg 2018; 105:618-627. [PMID: 29579319 DOI: 10.1002/bjs.10834] [Citation(s) in RCA: 46] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2017] [Revised: 01/05/2018] [Accepted: 01/11/2018] [Indexed: 12/15/2022]
Abstract
BACKGROUND Despite a 5-year overall survival rate of 58 per cent after liver resection for colorectal liver metastases (CLMs), more than half of patients develop recurrence, highlighting the need for accurate risk stratification and prognostication. Traditional prognostic factors have been superseded by newer outcome predictors, including those defined by the molecular origin of the primary tumour. METHODS This review synthesized findings in the literature using the PubMed database of articles in the English language published between 1998 and 2017 on prognostic and predictive biomarkers in patients undergoing resection of CLMs. RESULTS Responses to preoperative chemotherapy define prognosis in patients undergoing CLM resection. There are differences by embryological origin too. Somatic mutations in the proto-oncogenes KRAS and NRAS are associated with positive surgical margins and tumour regrowth after ablation. Other mutations (such as BRAF) and co-occurring mutations in RAS/TP53 and APC/PIK3CA have emerged as important biomarkers that determine an individual patient's tumour biology and may be used to predict outcome after CLM resection. CONCLUSION Knowledge of somatic mutations can guide the use of preoperative therapy, extent of surgical margin and selection for ablation alone.
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Affiliation(s)
- S Yamashita
- Department of Surgical Oncology, University of Texas MD Anderson Cancer Center, Houston, Texas, USA
| | - Y S Chun
- Department of Surgical Oncology, University of Texas MD Anderson Cancer Center, Houston, Texas, USA
| | - S E Kopetz
- Department of Gastrointestinal Medical Oncology, University of Texas MD Anderson Cancer Center, Houston, Texas, USA
| | - J-N Vauthey
- Department of Surgical Oncology, University of Texas MD Anderson Cancer Center, Houston, Texas, USA
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