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Genetic Alterations in the INK4a/ARF Locus: Effects on Melanoma Development and Progression. Biomolecules 2020; 10:biom10101447. [PMID: 33076392 PMCID: PMC7602651 DOI: 10.3390/biom10101447] [Citation(s) in RCA: 22] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2020] [Revised: 10/11/2020] [Accepted: 10/12/2020] [Indexed: 01/02/2023] Open
Abstract
Genetic alterations in the INK4a/ARF (or CDKN2A) locus have been reported in many cancer types, including melanoma; head and neck squamous cell carcinomas; lung, breast, and pancreatic cancers. In melanoma, loss of function CDKN2A alterations have been identified in approximately 50% of primary melanomas, in over 75% of metastatic melanomas, and in the germline of 40% of families with a predisposition to cutaneous melanoma. The CDKN2A locus encodes two critical tumor suppressor proteins, the cyclin-dependent kinase inhibitor p16INK4a and the p53 regulator p14ARF. The majority of CDKN2A alterations in melanoma selectively target p16INK4a or affect the coding sequence of both p16INK4a and p14ARF. There is also a subset of less common somatic and germline INK4a/ARF alterations that affect p14ARF, while not altering the syntenic p16INK4a coding regions. In this review, we describe the frequency and types of somatic alterations affecting the CDKN2A locus in melanoma and germline CDKN2A alterations in familial melanoma, and their functional consequences in melanoma development. We discuss the clinical implications of CDKN2A inactivating alterations and their influence on treatment response and resistance.
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2
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DeLeon TT, Almquist DR, Kipp BR, Langlais BT, Mangold A, Winters JL, Kosiorek HE, Joseph RW, Dronca RS, Block MS, McWilliams RR, Kottschade LA, Rumilla KM, Voss JS, Seetharam M, Sekulic A, Markovic SN, Bryce AH. Assessment of clinical outcomes with immune checkpoint inhibitor therapy in melanoma patients with CDKN2A and TP53 pathogenic mutations. PLoS One 2020; 15:e0230306. [PMID: 32196516 PMCID: PMC7083309 DOI: 10.1371/journal.pone.0230306] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2019] [Accepted: 02/27/2020] [Indexed: 12/27/2022] Open
Abstract
Background CDKN2A and TP53 mutations are recurrent events in melanoma, occurring in 13.3% and 15.1% of cases respectively and are associated with poorer outcomes. It is unclear what effect CDKN2A and TP53 mutations have on the clinical outcomes of patients treated with checkpoint inhibitors. Methods All patients with cutaneous melanoma or melanoma of unknown primary who received checkpoint inhibitor therapy and underwent genomic profiling with the 50-gene Mayo Clinic solid tumor targeted cancer gene panel were included. Patients were stratified according to the presence or absence of mutations in BRAF, NRAS, CDKN2A, and TP53. Patients without mutations in any of these genes were termed quadruple wild type (QuadWT). Clinical outcomes including median time to progression (TTP), median overall survival (OS), 6-month and 12-month OS, 6-month and 12-month without progression, ORR and disease control rate (DCR) were analyzed according to the mutational status of CDKN2A, TP53 and QuadWT. Results A total of 102 patients were included in this study of which 14 had mutations of CDKN2A (CDKN2Amut), 21 had TP53 mutations (TP53mut), and 12 were QuadWT. TP53mut, CDKN2Amut and QuadWT mutational status did not impact clinical outcomes including median TTP, median OS, 6-month and 12-month OS, 6-month and 12-month without progression, ORR and DCR. There was a trend towards improved median TTP and DCR in CDKN2Amut cohort and a trend towards worsened median TTP in the QuadWT cohort. Conclusion Cell cycle regulators such as TP53 and CDKN2A do not appear to significantly alter clinical outcomes when immune checkpoint inhibitors are used.
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Affiliation(s)
- Thomas T. DeLeon
- Department of Hematology & Oncology, Mayo Clinic Arizona, Scottsdale, Arizona, United States of America
| | - Daniel R. Almquist
- Department of Hematology & Oncology, Mayo Clinic Arizona, Scottsdale, Arizona, United States of America
| | - Benjamin R. Kipp
- Department of Laboratory Medicine and Pathology, Mayo Clinic Rochester, Rochester, Minnesota, United States of America
| | - Blake T. Langlais
- Department of Biostatistics, Mayo Clinic Arizona, Scottsdale, Arizona, United States of America
| | - Aaron Mangold
- Department of Dermatology, Mayo Clinic Arizona, Scottsdale, Arizona, United States of America
| | - Jennifer L. Winters
- Department of Laboratory Medicine and Pathology, Mayo Clinic Rochester, Rochester, Minnesota, United States of America
| | - Heidi E. Kosiorek
- Department of Biostatistics, Mayo Clinic Arizona, Scottsdale, Arizona, United States of America
| | - Richard W. Joseph
- Department of Hematology & Oncology, Mayo Clinic Rochester, Rochester, Minnesota, United States of America
| | - Roxana S. Dronca
- Department of Hematology & Oncology, Mayo Clinic Rochester, Rochester, Minnesota, United States of America
| | - Matthew S. Block
- Department of Hematology & Oncology, Mayo Clinic Rochester, Rochester, Minnesota, United States of America
| | - Robert R. McWilliams
- Department of Hematology & Oncology, Mayo Clinic Rochester, Rochester, Minnesota, United States of America
| | - Lisa A. Kottschade
- Department of Hematology & Oncology, Mayo Clinic Rochester, Rochester, Minnesota, United States of America
| | - Kandelaria M. Rumilla
- Department of Laboratory Medicine and Pathology, Mayo Clinic Rochester, Rochester, Minnesota, United States of America
| | - Jesse S. Voss
- Department of Laboratory Medicine and Pathology, Mayo Clinic Rochester, Rochester, Minnesota, United States of America
| | - Mahesh Seetharam
- Department of Hematology & Oncology, Mayo Clinic Arizona, Scottsdale, Arizona, United States of America
| | - Aleksandar Sekulic
- Department of Dermatology, Mayo Clinic Arizona, Scottsdale, Arizona, United States of America
- Mayo Clinic Cancer Center, Phoenix, Arizona, United States of America
| | - Svetomir N. Markovic
- Department of Hematology & Oncology, Mayo Clinic Rochester, Rochester, Minnesota, United States of America
| | - Alan H. Bryce
- Department of Hematology & Oncology, Mayo Clinic Arizona, Scottsdale, Arizona, United States of America
- * E-mail:
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Polubothu S, McGuire N, Al-Olabi L, Baird W, Bulstrode N, Chalker J, Josifova D, Lomas D, O'Hara J, Ong J, Rampling D, Stadnik P, Thomas A, Wedgeworth E, Sebire NJ, Kinsler VA. Does the gene matter? Genotype-phenotype and genotype-outcome associations in congenital melanocytic naevi. Br J Dermatol 2019; 182:434-443. [PMID: 31111470 PMCID: PMC7028140 DOI: 10.1111/bjd.18106] [Citation(s) in RCA: 34] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 05/02/2019] [Indexed: 12/29/2022]
Abstract
Background Genotype–phenotype studies can identify subgroups of patients with specific clinical features or differing outcomes, which can help shape management. Objectives To characterize the frequency of different causative genotypes in congenital melanocytic naevi (CMN), and to investigate genotype–phenotype and genotype–outcome associations. Methods We conducted a large cohort study in which we undertook MC1R genotyping from blood, and high‐sensitivity genotyping of NRAS and BRAF hotspots in 156 naevus biopsies from 134 patients with CMN [male 40%; multiple CMN 76%; projected adult size (PAS) > 20 cm, 59%]. Results Mosaic NRAS mutations were detected in 68%, mutually exclusive with BRAF mutations in 7%, with double wild‐type in 25%. Two separate naevi were sequenced in five of seven patients with BRAF mutations, confirming clonality. Five of seven patients with BRAF mutations had a dramatic multinodular phenotype, with characteristic histology distinct from classical proliferative nodules. NRAS mutation was the commonest in all sizes of CMN, but was particularly common in naevi with PAS > 60 cm, implying more tolerance to that mutation early in embryogenesis. Facial features were less common in double wild‐type patients. Importantly, the incidence of congenital neurological disease, and apparently of melanoma, was not altered by genotype; no cases of melanoma were seen in BRAF‐mutant multiple CMN, however, this genotype is rare. Conclusions CMN of all sizes are most commonly caused by mutations in NRAS. BRAF is confirmed as a much rarer cause of multiple CMN, and appears to be commonly associated with a multinodular phenotype. Genotype in this cohort was not associated with differences in incidence of neurological disease in childhood. However, genotyping should be undertaken in suspected melanoma, for guidance of treatment. What's already known about this topic? Multiple congenital melanocytic naevi (CMN) have been shown to be caused by NRAS mosaic mutations in 70–80% of cases, by BRAF mosaicism in one case report and by inference in some previous cases. There has been debate about genotypic association with different sizes of CMN, and no data on genotype–outcome.
What does this study add? NRAS mosaicism was found in 68%, BRAF in 7% and double wild‐type in 25% of cases of CMN. NRAS was the commonest mutation in all sizes of CMN, but was nearly universal in projected adult size > 60 cm. BRAF is often associated with a distinct multinodular clinical/histological phenotype. Adverse outcomes did not differ between genotypes on current numbers.
https://doi.org/10.1111/bjd.18747 available online
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Affiliation(s)
- S Polubothu
- Genetics and Genomic Medicine, University College London Great Ormond Street Institute of Child Health, London, U.K.,Paediatric Dermatology, Great Ormond Street Hospital for Children NHS Foundation Trust, London, U.K
| | - N McGuire
- Genetics and Genomic Medicine, University College London Great Ormond Street Institute of Child Health, London, U.K
| | - L Al-Olabi
- Genetics and Genomic Medicine, University College London Great Ormond Street Institute of Child Health, London, U.K
| | - W Baird
- Genetics and Genomic Medicine, University College London Great Ormond Street Institute of Child Health, London, U.K
| | - N Bulstrode
- Paediatric Plastic Surgery, Great Ormond Street Hospital for Children NHS Foundation Trust, London, U.K
| | - J Chalker
- Paediatric Malignancy Unit, Great Ormond Street Hospital for Children NHS Foundation Trust, London, U.K
| | - D Josifova
- Clinical Genetics, Guy's and St Thomas' Hospital NHS Foundation Trust, U.K
| | - D Lomas
- Paediatric Dermatology, Great Ormond Street Hospital for Children NHS Foundation Trust, London, U.K
| | - J O'Hara
- Paediatric Plastic Surgery, Great Ormond Street Hospital for Children NHS Foundation Trust, London, U.K
| | - J Ong
- Paediatric Plastic Surgery, Great Ormond Street Hospital for Children NHS Foundation Trust, London, U.K
| | - D Rampling
- Paediatric Pathology, Great Ormond Street Hospital for Children NHS Foundation Trust, London, U.K
| | - P Stadnik
- Genetics and Genomic Medicine, University College London Great Ormond Street Institute of Child Health, London, U.K
| | - A Thomas
- Genetics and Genomic Medicine, University College London Great Ormond Street Institute of Child Health, London, U.K
| | - E Wedgeworth
- Department of Dermatology, Guy's and St Thomas' Hospital NHS Foundation Trust, U.K
| | - N J Sebire
- Paediatric Pathology, Great Ormond Street Hospital for Children NHS Foundation Trust, London, U.K
| | - V A Kinsler
- Genetics and Genomic Medicine, University College London Great Ormond Street Institute of Child Health, London, U.K.,Paediatric Dermatology, Great Ormond Street Hospital for Children NHS Foundation Trust, London, U.K
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4
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Belgrano V, Mattsson J, Nilsson J, Olofsson Bagge R, Katsarelias D. BRAF status as a predictive factor for response in isolated limb perfusion. Int J Hyperthermia 2019; 36:511-515. [DOI: 10.1080/02656736.2019.1601778] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022] Open
Affiliation(s)
- Valerio Belgrano
- Department of Surgery, Institute of Clinical Sciences, Sahlgrenska Academy at the University of Gothenburg, Gothenburg, Sweden
- Sahlgrenska Cancer Center, University of Gothenburg, Gothenburg, Sweden
| | - Jan Mattsson
- Department of Surgery, Institute of Clinical Sciences, Sahlgrenska Academy at the University of Gothenburg, Gothenburg, Sweden
- Department of Surgery, Sahlgrenska University Hospital, Gothenburg, Sweden
| | - Jonas Nilsson
- Sahlgrenska Cancer Center, University of Gothenburg, Gothenburg, Sweden
| | - Roger Olofsson Bagge
- Department of Surgery, Institute of Clinical Sciences, Sahlgrenska Academy at the University of Gothenburg, Gothenburg, Sweden
- Sahlgrenska Cancer Center, University of Gothenburg, Gothenburg, Sweden
- Department of Surgery, Sahlgrenska University Hospital, Gothenburg, Sweden
- Wallenberg Centre for Molecular and Translational Medicine, University of Gothenburg, Gothenburg, Sweden
| | - Dimitrios Katsarelias
- Department of Surgery, Institute of Clinical Sciences, Sahlgrenska Academy at the University of Gothenburg, Gothenburg, Sweden
- Department of Surgery, Sahlgrenska University Hospital, Gothenburg, Sweden
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Rodríguez-Cerdeira C, Molares-Vila A, Carnero-Gregorio M, Corbalán-Rivas A. Recent advances in melanoma research via "omics" platforms. J Proteomics 2017; 188:152-166. [PMID: 29138111 DOI: 10.1016/j.jprot.2017.11.005] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/17/2017] [Revised: 10/25/2017] [Accepted: 11/08/2017] [Indexed: 02/09/2023]
Abstract
Melanoma has a high mortality rate and metastatic melanoma is highly resistant to conventional therapies. "Omics" fields such as proteomics and microRNA and exosome studies have provided new knowledge to complement the information generated by genomic studies. This work aimed to review the current status of biomarker discovery for melanoma through multi-"omics" platforms. A few sets of novel microRNAs and proteins are described, some of them with important implications in suppressing melanoma at different stages. Upregulation of genes involved in angiogenesis, immunosuppressive factors, modification of stroma, capture of melanoma cells in lymph nodes and factors responsible for tumour cell recruitment have been identified in exosomes, among molecules with other functions. A remarkable series of proteins involved in epithelial-mesenchymal/mesenchymal-epithelial transitions, inflammation, motility, proliferation and progression processes, centrosome amplification, aneuploidy, inhibition of CD8+ effector T-cells, and metastasis in general were identified. Genomic and protein-protein interactions or metabolome levels were not analysed. Proteomics tools such as Orbitrap shotgun mass spectrometry or deep mining proteomic analysis utilizing high-resolution reversed phase nanoseparation in combination with mass spectrometry are also discussed. The application of these tools together with bioinformatics approaches applied to the clinical setting will enable the implementation of personalized medicine in the near future.
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Affiliation(s)
- Carmen Rodríguez-Cerdeira
- Efficiency, Quality and Costs in Health Services Research Group (EFISALUD), Galicia Sur Health Research Institute (IIS Galicia Sur), SERGAS-UVIGO, Spain; Dermatology Department, Complexo Hospitalario Universitario de Vigo (CHUVI), SERGAS, Vigo, Spain.
| | - Alberto Molares-Vila
- Efficiency, Quality and Costs in Health Services Research Group (EFISALUD), Galicia Sur Health Research Institute (IIS Galicia Sur), SERGAS-UVIGO, Spain; Department of Analytical & Food Chemistry, Universidade de Vigo (UVIGO), Spain
| | - Miguel Carnero-Gregorio
- Efficiency, Quality and Costs in Health Services Research Group (EFISALUD), Galicia Sur Health Research Institute (IIS Galicia Sur), SERGAS-UVIGO, Spain; Department of Biochemistry, Genetics & Immunology, Universidade de Vigo (UVIGO), Spain
| | - Alberte Corbalán-Rivas
- Nursery Department, Complexo Hospitalario Universitario de A Coruña (CHUAC), SERGAS, A Coruña, Spain
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6
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Foth M, Wouters J, de Chaumont C, Dynoodt P, Gallagher WM. Prognostic and predictive biomarkers in melanoma: an update. Expert Rev Mol Diagn 2015; 16:223-37. [PMID: 26620320 DOI: 10.1586/14737159.2016.1126511] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
Malignant melanoma is one of the most aggressive cancers. Several new therapeutic strategies that focus on immuno- and/or targeted therapy have been developed, which have entered clinical trials or already been approved. This review provides an update on prognostic and predictive biomarkers in melanoma that may be used to improve the clinical management of patients. Prognostic markers include conventional histopathological characteristics, chromosomal aberrations, gene expression patterns and miRNA profiles. There is a trend towards multi-marker assays and whole-genome molecular screening methods to determine the prognosis of individual patients. Predictive biomarkers, including targeted components of signal transduction, developmental or transcriptional pathways, can be used to determine patient response towards a particular treatment or combination thereof. The rapid evolution of sequencing technologies and multi-marker screening will change the spectrum of patients who become candidates for therapeutic agents, and in addition create new ethical and regulatory challenges.
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Affiliation(s)
- Mona Foth
- a OncoMark Ltd., NovaUCD, Bellfield , University College Dublin , Dublin , Ireland.,b Cancer Research UK, Beatson Institute , Glasgow , United Kingdom
| | - Jasper Wouters
- a OncoMark Ltd., NovaUCD, Bellfield , University College Dublin , Dublin , Ireland.,c Translational Cell & Tissue Research , Department of Imaging and Pathology, Katholieke Universiteit Leuven , Leuven , Belgium
| | - Ciaran de Chaumont
- a OncoMark Ltd., NovaUCD, Bellfield , University College Dublin , Dublin , Ireland.,d Department of Physiology and Medical Physics, Royal College of Surgeons in Ireland , Dublin , Ireland
| | - Peter Dynoodt
- a OncoMark Ltd., NovaUCD, Bellfield , University College Dublin , Dublin , Ireland
| | - William M Gallagher
- a OncoMark Ltd., NovaUCD, Bellfield , University College Dublin , Dublin , Ireland.,e UCD Cancer Biology and Therapeutics Laboratory, School of Biomolecular and Biomedical Science, Conway Institute of Biomolecular and Biomedical Research , University College Dublin , Dublin , Ireland
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7
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Qi D, Li J, Jiang M, Liu C, Hu Y, Li M, Su J, Que B, Ji W. The relationship between promoter methylation of p16 gene and bladder cancer risk: a meta-analysis. Int J Clin Exp Med 2015; 8:20701-20711. [PMID: 26884993 PMCID: PMC4723838] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2015] [Accepted: 11/06/2015] [Indexed: 06/05/2023]
Abstract
PURPOSE Many scientific evidences suggested that the methylation of p16INK4a (p16) was associated with bladder cancer, but some existing studies have yielded inconclusive results about the relationship between p16 promoter methylation and pathological features or the tumor grade of bladder cancer. This meta-analysis of studies aims to evaluate the clinical and prognostic significance of p16 methylation in bladder carcinogenesis. METHODS Studies were systemically searched via PubMed and Google Scholar in English up to Sept 2015 and a total of ten appropriate studies (693 cases and 290 controls) with an average NOS score of 6.8 were included. The quality of the appropriate studies was measured by the Newcastle-Ottawa Scale (NOS) assessment. RESULTS The meta-analysis results revealed that the methylation state of p16 was statistically significantly associated with an increased risk of bladder cancer (OR=6.71, 95% CI=3.79-11.87) compared to control, and there is no statistically significantly association between the p16 methylation and the tumor pTNM staging (OR=0.59, 95% CI=0.22-1.60) or the tumor grade (OR=1.01, 95% CI=0.52-1.94) in p16 methylated patients compared to unmethylated patients. CONCLUSIONS our meta-analysis indicates that p16 promoter methylation may be a promising biomarker for the diagnosis of bladder cancer and the inactivation of p16 may be an early event in bladder carcinogenesis. More studies with larger numbers of participants worldwide are needed to further identify the obvious association above.
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Affiliation(s)
- Defeng Qi
- Department of Urology, Minimally Invasive Surgery Center, The First Affiliated Hospital of Guangzhou Medical University, Guangdong Key Laboratory of UrologyKangda Road 1#, Haizhu District, Guangzhou 510230, Guangdong, China
| | - Jinhui Li
- Department of Urology, Minimally Invasive Surgery Center, The First Affiliated Hospital of Guangzhou Medical University, Guangdong Key Laboratory of UrologyKangda Road 1#, Haizhu District, Guangzhou 510230, Guangdong, China
| | - Mei Jiang
- Department of Urology, Minimally Invasive Surgery Center, The First Affiliated Hospital of Guangzhou Medical University, Guangdong Key Laboratory of UrologyKangda Road 1#, Haizhu District, Guangzhou 510230, Guangdong, China
| | - Chenli Liu
- Department of Urology, Minimally Invasive Surgery Center, The First Affiliated Hospital of Guangzhou Medical University, Guangdong Key Laboratory of UrologyKangda Road 1#, Haizhu District, Guangzhou 510230, Guangdong, China
| | - Yuan Hu
- Department of Urology, Minimally Invasive Surgery Center, The First Affiliated Hospital of Guangzhou Medical University, Guangdong Key Laboratory of UrologyKangda Road 1#, Haizhu District, Guangzhou 510230, Guangdong, China
| | - Mengxi Li
- Department of Urology, Minimally Invasive Surgery Center, The First Affiliated Hospital of Guangzhou Medical University, Guangdong Key Laboratory of UrologyKangda Road 1#, Haizhu District, Guangzhou 510230, Guangdong, China
| | - Jialin Su
- Department of Urology, Minimally Invasive Surgery Center, The First Affiliated Hospital of Guangzhou Medical University, Guangdong Key Laboratory of UrologyKangda Road 1#, Haizhu District, Guangzhou 510230, Guangdong, China
| | - Biao Que
- Department of Urology, Minimally Invasive Surgery Center, The First Affiliated Hospital of Guangzhou Medical University, Guangdong Key Laboratory of UrologyKangda Road 1#, Haizhu District, Guangzhou 510230, Guangdong, China
| | - Weidong Ji
- The First Affiliated Hospital, Center for Translational Medicine, Sun Yat-sen UniversityGuangzhou, China
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8
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Kim SH, Park KH, Shin SJ, Lee KY, Kim TI, Kim NK, Rha SY, Roh JK, Ahn JB. p16 Hypermethylation and KRAS Mutation Are Independent Predictors of Cetuximab Plus FOLFIRI Chemotherapy in Patients with Metastatic Colorectal Cancer. Cancer Res Treat 2015; 48:208-15. [PMID: 25943321 PMCID: PMC4720076 DOI: 10.4143/crt.2014.314] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2014] [Accepted: 03/11/2015] [Indexed: 01/03/2023] Open
Abstract
Purpose Hypermethylation of the CpG island of p16INK4a occurs in a significant proportion of colorectal cancer (CRC). We aimed to investigate its predictive role in CRC patients treated with 5-fluorouracil, leucovorin, irinotecan (FOLFIRI), and cetuximab. Materials and Methods Pyrosequencing was used to identify KRAS mutation and hypermethylation of 6 CpG island loci (p16, p14, MINT1, MINT2, MINT31, and hMLH1) in DNA extracted from formalin-fixed paraffin-embedded specimens. Logistic regression and Cox regression were performed for analysis of the relation between methylation status of CpG island methylator phenotype (CIMP) markers including p16 and clinical outcome. Results Hypermethylation of the p16 gene was detected in 14 of 49 patients (28.6%) and showed significant association with KRAS mutation (Fisher exact, p=0.01) and CIMP positivity (Fisher exact, p=0.002). Patients with p16-unmethylated tumors had significantly longer time to progression (TTP; median, 9.0 months vs. 3.5 months; log-rank, p=0.001) and overall survival (median, 44.9 months vs. 16.4 months; log-rank, p=0.008) than those with p16-methylated tumors. Patients with both KRAS and p16 aberrancy (n=6) had markedly shortened TTP (median, 2.8 months) compared to those with either KRAS or p16 aberrancy (n=11; median, 8.6 months; p=0.021) or those with neither (n=32; median, 9.0 months; p < 0.0001). In multivariate analysis, KRAS mutation and p16 methylation showed independent association with shorter TTP (KRAS mutation: hazard ratio [HR], 3.21; p=0.017; p16 methylation: HR, 2.97; p=0.027). Conclusion Hypermethylation of p16 was predictive of clinical outcome in metastatic CRC patients treated with cetuximab and FOLFIRI, irrespective of KRAS mutation.
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Affiliation(s)
- Se Hyun Kim
- Department of Internal Medicine, Seoul National University Bundang Hospital, Seongnam, Korea
| | - Kyu Hyun Park
- Institute for Cancer Research, College of Medicine, Yonsei University, Seoul, Korea
| | - Sang Joon Shin
- Department of Internal Medicine, Yonsei University College of Medicine, Seoul, Korea
| | - Kang Young Lee
- Department of Surgery, Yonsei University College of Medicine, Seoul, Korea
| | - Tae Il Kim
- Department of Internal Medicine, Yonsei University College of Medicine, Seoul, Korea
| | - Nam Kyu Kim
- Department of Surgery, Yonsei University College of Medicine, Seoul, Korea
| | - Sun Young Rha
- Department of Internal Medicine, Yonsei University College of Medicine, Seoul, Korea
| | - Jae Kyung Roh
- Department of Internal Medicine, Yonsei University College of Medicine, Seoul, Korea
| | - Joong Bae Ahn
- Institute for Cancer Research, College of Medicine, Yonsei University, Seoul, Korea ; Department of Internal Medicine, Yonsei University College of Medicine, Seoul, Korea
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Pracht M, Mogha A, Lespagnol A, Fautrel A, Mouchet N, Le Gall F, Paumier V, Lefeuvre-Plesse C, Rioux-Leclerc N, Mosser J, Oger E, Adamski H, Galibert MD, Lesimple T. Prognostic and predictive values of oncogenic BRAF, NRAS, c-KIT
and MITF
in cutaneous and mucous melanoma. J Eur Acad Dermatol Venereol 2015; 29:1530-8. [DOI: 10.1111/jdv.12910] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/27/2014] [Accepted: 11/05/2014] [Indexed: 12/13/2022]
Affiliation(s)
- M. Pracht
- Service d'Oncologie Médicale; Centre Eugene Marquis; Rennes France
- Brittany Melanoma Network; GRoupe Ouest Mélanome (GROUM); Rennes France
| | - A. Mogha
- Gene Expression and Oncogenesis Team; Institut de Génétique et Developement de Rennes; CNRS UMR6290; Rennes France
- CHU Pontchaillou; Université Européenne de Bretagne; Rennes France
| | - A. Lespagnol
- CHU Pontchaillou; Université Européenne de Bretagne; Rennes France
- CHU Pontchaillou; Service de Génétique Moléculaire et Génomique des Cancers; Rennes France
| | - A. Fautrel
- CHU Pontchaillou; Université Européenne de Bretagne; Rennes France
- SFR Biosit UMS CNRS 3480/US INSERM 018; Rennes France
| | - N. Mouchet
- Gene Expression and Oncogenesis Team; Institut de Génétique et Developement de Rennes; CNRS UMR6290; Rennes France
- CHU Pontchaillou; Université Européenne de Bretagne; Rennes France
| | - F. Le Gall
- Brittany Melanoma Network; GRoupe Ouest Mélanome (GROUM); Rennes France
- CHU Pontchaillou; Université Européenne de Bretagne; Rennes France
- Service d'Anatomopathologie; CHU Pontchaillou; Rennes France
| | - V. Paumier
- Brittany Melanoma Network; GRoupe Ouest Mélanome (GROUM); Rennes France
- Laboratoire d'Anatomopathologie Atalante; Rennes France
| | - C. Lefeuvre-Plesse
- Service d'Oncologie Médicale; Centre Eugene Marquis; Rennes France
- Brittany Melanoma Network; GRoupe Ouest Mélanome (GROUM); Rennes France
| | - N. Rioux-Leclerc
- CHU Pontchaillou; Université Européenne de Bretagne; Rennes France
- Service d'Anatomopathologie; CHU Pontchaillou; Rennes France
| | - J. Mosser
- CHU Pontchaillou; Université Européenne de Bretagne; Rennes France
- CHU Pontchaillou; Service de Génétique Moléculaire et Génomique des Cancers; Rennes France
| | - E. Oger
- CHU Pontchaillou; Université Européenne de Bretagne; Rennes France
- Centre d'Investigations Cliniques et Unité de Pharmacologie et de Pharmaco-épidémiologie; Rennes France
| | - H. Adamski
- Brittany Melanoma Network; GRoupe Ouest Mélanome (GROUM); Rennes France
- CHU Pontchaillou; Université Européenne de Bretagne; Rennes France
- CHU Pontchaillou; Service de Dermatologie; Rennes France
| | - M.-D. Galibert
- Brittany Melanoma Network; GRoupe Ouest Mélanome (GROUM); Rennes France
- Gene Expression and Oncogenesis Team; Institut de Génétique et Developement de Rennes; CNRS UMR6290; Rennes France
- CHU Pontchaillou; Université Européenne de Bretagne; Rennes France
| | - T. Lesimple
- Service d'Oncologie Médicale; Centre Eugene Marquis; Rennes France
- Brittany Melanoma Network; GRoupe Ouest Mélanome (GROUM); Rennes France
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Role of the ERK1/2 pathway in tumor chemoresistance and tumor therapy. Bioorg Med Chem Lett 2014; 25:192-7. [PMID: 25515559 DOI: 10.1016/j.bmcl.2014.11.076] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/27/2014] [Revised: 11/14/2014] [Accepted: 11/27/2014] [Indexed: 12/23/2022]
Abstract
Chemotherapy is one of the important methods for treatment in tumors. However, many tumor patients may experience tumor recurrence because of treatment failure due to chemoresistance. Although many signaling pathways could influence chemoresistance of tumor cells, the extracellular signal-regulated kinase 1 and 2 (ERK1/2) pathway has gained significant attention because of its implications in signaling and which has crosstalk with other signaling pathways. Extensive studies conclude that ERK1/2 pathway is responding to chemoresistance in many kinds of malignant tumors. The aim of this review is to discuss on the role of ERK1/2 pathway in chemoresistance and therapy of tumors. A comprehensive understanding of ERK1/2 pathway in chemoresistance of tumors could provide novel avenues for treatment strategies of tumors.
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Boyken SE, Chopra N, Xie Q, Joseph RE, Wales TE, Fulton DB, Engen JR, Jernigan RL, Andreotti AH. A conserved isoleucine maintains the inactive state of Bruton's tyrosine kinase. J Mol Biol 2014; 426:3656-69. [PMID: 25193673 DOI: 10.1016/j.jmb.2014.08.018] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/25/2014] [Revised: 08/22/2014] [Accepted: 08/23/2014] [Indexed: 12/22/2022]
Abstract
Despite high level of homology among non-receptor tyrosine kinases, different kinase families employ a diverse array of regulatory mechanisms. For example, the catalytic kinase domains of the Tec family kinases are inactive without assembly of the adjacent regulatory domains, whereas the Src kinase domains are autoinhibited by the assembly of similar adjacent regulatory domains. Using molecular dynamics simulations, biochemical assays, and biophysical approaches, we have uncovered an isoleucine residue in the kinase domain of the Tec family member Btk that, when mutated to the closely related leucine, leads to a shift in the conformational equilibrium of the kinase domain toward the active state. The single amino acid mutation results in measureable catalytic activity for the Btk kinase domain in the absence of the regulatory domains. We suggest that this isoleucine side chain in the Tec family kinases acts as a "wedge" that restricts the conformational space available to key regions in the kinase domain, preventing activation until the kinase domain associates with its regulatory subunits and overcomes the energetic barrier to activation imposed by the isoleucine side chain.
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Affiliation(s)
- Scott E Boyken
- Roy J. Carver Department of Biochemistry, Biophysics and Molecular Biology, Iowa State University, Ames, IA 50011, USA
| | - Nikita Chopra
- Roy J. Carver Department of Biochemistry, Biophysics and Molecular Biology, Iowa State University, Ames, IA 50011, USA
| | - Qian Xie
- Roy J. Carver Department of Biochemistry, Biophysics and Molecular Biology, Iowa State University, Ames, IA 50011, USA
| | - Raji E Joseph
- Roy J. Carver Department of Biochemistry, Biophysics and Molecular Biology, Iowa State University, Ames, IA 50011, USA
| | - Thomas E Wales
- Department of Chemistry and Chemical Biology, Northeastern University, Boston, MA 02115, USA
| | - D Bruce Fulton
- Roy J. Carver Department of Biochemistry, Biophysics and Molecular Biology, Iowa State University, Ames, IA 50011, USA
| | - John R Engen
- Department of Chemistry and Chemical Biology, Northeastern University, Boston, MA 02115, USA
| | - Robert L Jernigan
- Roy J. Carver Department of Biochemistry, Biophysics and Molecular Biology, Iowa State University, Ames, IA 50011, USA
| | - Amy H Andreotti
- Roy J. Carver Department of Biochemistry, Biophysics and Molecular Biology, Iowa State University, Ames, IA 50011, USA.
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Barbour AP, Tang YH, Armour N, Dutton-Regester K, Krause L, Loffler KA, Lambie D, Burmeister B, Thomas J, Smithers BM, Hayward NK. BRAF mutation status is an independent prognostic factor for resected stage IIIB and IIIC melanoma: implications for melanoma staging and adjuvant therapy. Eur J Cancer 2014; 50:2668-76. [PMID: 25070294 DOI: 10.1016/j.ejca.2014.06.009] [Citation(s) in RCA: 56] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2014] [Revised: 06/13/2014] [Accepted: 06/13/2014] [Indexed: 02/09/2023]
Abstract
BACKGROUND 5-year survival for melanoma metastasis to regional lymph nodes (American Joint Committee on Cancer stage III) is <50%. Knowledge of outcomes following therapeutic lymphadenectomy for stage III melanoma related to BRAF status may guide adjuvant use of BRAF/MEK inhibitors along with established and future therapies. AIMS To determine patterns of melanoma recurrence and survival following therapeutic lymph node dissection (TLND) associated with oncogenic mutations. METHODS DNA was obtained from patients who underwent TLND and had ⩾2 positive nodes, largest node >3cm or extracapsular invasion. Mutations were detected using an extended Sequenom MelaCARTA panel. RESULTS Mutations were most commonly detected in BRAF (57/124 [46%] patients) and NRAS (26/124 [21%] patients). Patients with BRAF mutations had higher 3-year recurrence rate (77%) versus 54% for BRAF wild-type patients (hazard ratio (HR) 1.8, p=0.008). The only prognostically significant mutations occurred in BRAF: median recurrence-free (RFS) and disease-specific survival (DSS) for BRAF mutation patients was 7 months and 16 months, versus 19 months and not reached for BRAF wild-type patients, respectively. Multivariate analysis identified BRAF mutant status and number of positive lymph nodes as the only independent prognostic factors for RFS and DSS. CONCLUSIONS Patients with BRAF mutations experienced rapid progression of metastatic disease with locoregional recurrence rarely seen in isolation, supporting incorporation of BRAF status into melanoma staging and use of BRAF/MEK inhibitors post-TLND.
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Affiliation(s)
- Andrew P Barbour
- Surgical Oncology Group, School of Medicine, The University of Queensland, Translational Research Institute, Woolloongabba, QLD, Australia; Queensland Melanoma Project, Discipline of Surgery, The University of Queensland, Princess Alexandra Hospital, Woolloongabba, QLD, Australia.
| | - Yue Hang Tang
- Surgical Oncology Group, School of Medicine, The University of Queensland, Translational Research Institute, Woolloongabba, QLD, Australia
| | - Nicola Armour
- Surgical Oncology Group, School of Medicine, The University of Queensland, Translational Research Institute, Woolloongabba, QLD, Australia
| | - Ken Dutton-Regester
- QIMR Berghofer Medical Research Institute, Oncogenomics Laboratory, Brisbane, QLD, Australia
| | - Lutz Krause
- QIMR Berghofer Medical Research Institute, Oncogenomics Laboratory, Brisbane, QLD, Australia
| | - Kelly A Loffler
- Surgical Oncology Group, School of Medicine, The University of Queensland, Translational Research Institute, Woolloongabba, QLD, Australia
| | - Duncan Lambie
- Department of Pathology, Princess Alexandra Hospital, Woolloongabba, QLD, Australia
| | - Bryan Burmeister
- Queensland Melanoma Project, Discipline of Surgery, The University of Queensland, Princess Alexandra Hospital, Woolloongabba, QLD, Australia
| | - Janine Thomas
- Queensland Melanoma Project, Discipline of Surgery, The University of Queensland, Princess Alexandra Hospital, Woolloongabba, QLD, Australia
| | - B Mark Smithers
- Queensland Melanoma Project, Discipline of Surgery, The University of Queensland, Princess Alexandra Hospital, Woolloongabba, QLD, Australia
| | - Nicholas K Hayward
- QIMR Berghofer Medical Research Institute, Oncogenomics Laboratory, Brisbane, QLD, Australia
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Carlino MS, Haydu LE, Kakavand H, Menzies AM, Hamilton AL, Yu B, Ng CC, Cooper WA, Thompson JF, Kefford RF, O'Toole SA, Scolyer RA, Long GV. Correlation of BRAF and NRAS mutation status with outcome, site of distant metastasis and response to chemotherapy in metastatic melanoma. Br J Cancer 2014; 111:292-9. [PMID: 24918823 PMCID: PMC4102942 DOI: 10.1038/bjc.2014.287] [Citation(s) in RCA: 85] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Revised: 04/08/2014] [Accepted: 04/30/2014] [Indexed: 01/14/2023] Open
Abstract
BACKGROUND The prognostic significance of BRAF and NRAS mutations in metastatic melanoma patients remains uncertain, with several studies reporting conflicting results, often biased by the inclusion of patients treated with BRAF and MEK (MAPK) inhibitors. We therefore interrogated a historical cohort of patients free of the confounding influence of MAPK inhibitor therapy. METHODS Patients with available archival tissue first diagnosed with metastatic melanoma between 2002 and 2006 were analysed. Mutational analysis was performed using the OncoCarta Panel. Patient characteristics, treatment outcome and survival were correlated with BRAF/NRAS mutation status. RESULTS In 193 patients, 92 (48%) melanomas were BRAF-mutant, 39 (20%) were NRAS-mutant and 62 (32%) were wild-type for BRAF/NRAS mutations (wt). There was no difference in response to chemotherapy based on mutation status (35-37%). The distant disease-free interval (DDFI) was significantly shorter in patients with wt melanoma (27.9 months vs 35.1 for BRAF and 49.1 for NRAS) although this was not significant in multivariate analysis. Survival from stage IV melanoma diagnosis was not significantly different based on mutation status. The DDFI was significantly shorter in patients with BRAF(V600K/R) versus BRAF(V600E) melanoma in univariate and multivariate analyses. CONCLUSIONS BRAF and NRAS mutation status does not influence survival in metastatic melanoma.
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Affiliation(s)
- M S Carlino
- Melanoma Institute Australia, Sydney, New South Wales, Australia
- Westmead Institute for Cancer Research, University of Sydney at Westmead Millennium Institute, Westmead, New South Wales, Australia
- Department of Medical Oncology, Crown Princess Mary Cancer Centre, Westmead Hospital, Westmead, New South Wales, Australia
- Discipline of Medicine, Sydney Medical School, The University of Sydney, Sydney, New South Wales, Australia
| | - L E Haydu
- Melanoma Institute Australia, Sydney, New South Wales, Australia
- Discipline of Surgery, Sydney Medical School, The University of Sydney, Sydney, New South Wales, Australia
| | - H Kakavand
- Melanoma Institute Australia, Sydney, New South Wales, Australia
- Discipline of Pathology, Sydney Medical School, The University of Sydney, Sydney, New South Wales, Australia
| | - A M Menzies
- Melanoma Institute Australia, Sydney, New South Wales, Australia
- Discipline of Medicine, Sydney Medical School, The University of Sydney, Sydney, New South Wales, Australia
| | - A L Hamilton
- Discipline of Medicine, Sydney Medical School, The University of Sydney, Sydney, New South Wales, Australia
- Department of Medical Oncology, Royal Prince Alfred Hospital, Camperdown, New South Wales, Australia
| | - B Yu
- Discipline of Medicine, Sydney Medical School, The University of Sydney, Sydney, New South Wales, Australia
- Department of Medical Genomics, Royal Prince Alfred Hospital, Camperdown, New South Wales, Australia
| | - C C Ng
- Department of Medical Genomics, Royal Prince Alfred Hospital, Camperdown, New South Wales, Australia
| | - W A Cooper
- Department of Medical Genomics, Royal Prince Alfred Hospital, Camperdown, New South Wales, Australia
- Department of Tissue Pathology and Diagnostic Oncology, Royal Prince Alfred Hospital, Camperdown, New South Wales, Australia
- School of Medicine, University of Western Sydney, Sydney, NSW, Australia
| | - J F Thompson
- Melanoma Institute Australia, Sydney, New South Wales, Australia
- Discipline of Surgery, Sydney Medical School, The University of Sydney, Sydney, New South Wales, Australia
- Department of Melanoma and Surgical Oncology, Royal Prince Alfred Hospital, Camperdown, New South Wales, Australia
| | - R F Kefford
- Melanoma Institute Australia, Sydney, New South Wales, Australia
- Westmead Institute for Cancer Research, University of Sydney at Westmead Millennium Institute, Westmead, New South Wales, Australia
- Department of Medical Oncology, Crown Princess Mary Cancer Centre, Westmead Hospital, Westmead, New South Wales, Australia
- Discipline of Medicine, Sydney Medical School, The University of Sydney, Sydney, New South Wales, Australia
| | - S A O'Toole
- Discipline of Pathology, Sydney Medical School, The University of Sydney, Sydney, New South Wales, Australia
- Department of Tissue Pathology and Diagnostic Oncology, Royal Prince Alfred Hospital, Camperdown, New South Wales, Australia
- The Kinghorn Cancer Centre and Cancer Program Garvan Institute of Medical Research, Victoria Street, Darlinghurst, New South Wales, Australia
| | - R A Scolyer
- Melanoma Institute Australia, Sydney, New South Wales, Australia
- Discipline of Pathology, Sydney Medical School, The University of Sydney, Sydney, New South Wales, Australia
- Department of Tissue Pathology and Diagnostic Oncology, Royal Prince Alfred Hospital, Camperdown, New South Wales, Australia
| | - G V Long
- Melanoma Institute Australia, Sydney, New South Wales, Australia
- Discipline of Medicine, Sydney Medical School, The University of Sydney, Sydney, New South Wales, Australia
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Liang X, Wang P, Gao Q, Tao X. Exogenous activation of LKB1/AMPK signaling induces G₁ arrest in cells with endogenous LKB1 expression. Mol Med Rep 2014; 9:1019-24. [PMID: 24469340 DOI: 10.3892/mmr.2014.1916] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/03/2013] [Accepted: 01/17/2014] [Indexed: 11/06/2022] Open
Abstract
The tumor suppressor protein LKB1 is a serine/threonine kinase that plays a critical role in cell proliferation, and its inactivation has been linked to tumorigenesis in various cancer types. Current understanding of the LKB1 function is largely restricted to results from experiments on LKB1‑deficient cancer cells, while the regulation and activity of endogenous LKB1 has been rarely investigated. In a previous study, we showed that LKB1 knockdown in two healthy cell lines accelerates cell cycle progression through the G1/S checkpoint by inhibition of the p53 and p16 pathways. In the present study, we examined the effects of overexpression of LKB1 on two healthy and one cancer cell line. Administration of exogenous LKB1 activated LKB1/AMPK signaling and arrested the cell cycle at the G1 phase in an LKB1-dependent manner. G1 arrest induced by LKB1 was accompanied by the downregulation of cyclin D1 and cyclin D3, and the upregulation of p53, p21 and p16, while no differences were detected for CDK4, CDK6, cyclin E, p15 and p27. These results indicated that exogenous activation of LKB1/AMPK signaling inhibits the G1/S cell cycle transition, even in cells with an endogenous expression of LKB1. Findings of the present study extend earlier observations on LKB1‑inactivated neoplastic cells and provide novel insights into the growth-inhibitory effects of LKB1.
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Affiliation(s)
- Xiaoyan Liang
- Department of Gastroenterology, The First Affiliated Hospital of Chongqing Medical University, Chongqing 400016, P.R. China
| | - Pilong Wang
- Department of Gastroenterology, The First Affiliated Hospital of Chongqing Medical University, Chongqing 400016, P.R. China
| | - Qing Gao
- Department of Gastroenterology, The First Affiliated Hospital of Chongqing Medical University, Chongqing 400016, P.R. China
| | - Xiaohong Tao
- Department of Gastroenterology, The First Affiliated Hospital of Chongqing Medical University, Chongqing 400016, P.R. China
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Möller MG, Salwa S, Soden DM, O’Sullivan GC. Electrochemotherapy as an adjunct or alternative to other treatments for unresectable or in-transit melanoma. Expert Rev Anticancer Ther 2014; 9:1611-30. [DOI: 10.1586/era.09.129] [Citation(s) in RCA: 41] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
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16
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Nathanson KL, Martin AM, Wubbenhorst B, Greshock J, Letrero R, D'Andrea K, O'Day S, Infante JR, Falchook GS, Arkenau HT, Millward M, Brown MP, Pavlick A, Davies MA, Ma B, Gagnon R, Curtis M, Lebowitz PF, Kefford R, Long GV. Tumor genetic analyses of patients with metastatic melanoma treated with the BRAF inhibitor dabrafenib (GSK2118436). Clin Cancer Res 2013; 19:4868-78. [PMID: 23833299 DOI: 10.1158/1078-0432.ccr-13-0827] [Citation(s) in RCA: 136] [Impact Index Per Article: 12.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
PURPOSE Dabrafenib is a selective inhibitor of V600-mutant BRAF kinase, which recently showed improved progression-free survival (PFS) as compared with dacarbazine, in metastatic melanoma patients. This study examined potential genetic markers associated with response and PFS in the phase I study of dabrafenib. EXPERIMENTAL DESIGN Baseline (pretreatment or archival) melanoma samples were evaluated in 41 patients using a custom genotyping melanoma-specific assay, sequencing of PTEN, and copy number analysis using multiplex ligation amplification and array-based comparative genomic hybridization. Nine patients had on-treatment and/or progression samples available. RESULTS All baseline patient samples had BRAF(V600E/K) confirmed. Baseline PTEN loss/mutation was not associated with best overall response to dabrafenib, but it showed a trend for shorter median PFS [18.3 (95% confidence interval, CI, 9.1-24.3) vs. 32.1 weeks (95% CI, 24.1-33), P=0.059]. Higher copy number of CCND1 (P=0.009) and lower copy number of CDKN2A (P=0.012) at baseline were significantly associated with decreased PFS. Although no melanomas had high-level amplification of BRAF, the two patients with progressive disease as their best response had BRAF copy gain in their tumors. CONCLUSIONS Copy number changes in CDKN2A, CCND1, and mutation/copy number changes in PTEN correlated with the duration of PFS in patients treated with dabrafenib. The results suggest that these markers should be considered in the design and interpretation of future trials with selective BRAF inhibitors in advanced melanoma patients.
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Affiliation(s)
- Katherine L Nathanson
- Department of Medicine, School of Medicine, University of Pennsylvania, Philadelphia, PA 19104, USA.
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Barani IJ, Larson DA, Berger MS. Future directions in treatment of brain metastases. Surg Neurol Int 2013; 4:S220-30. [PMID: 23717793 PMCID: PMC3656563 DOI: 10.4103/2152-7806.111299] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/23/2013] [Accepted: 02/11/2013] [Indexed: 11/22/2022] Open
Abstract
BACKGROUND Brain metastases affect up to 30% of patients with cancer. Management of brain metastases continues to evolve with ever increasing focus on cognitive preservation and quality of life. This manuscript reviews current state of brain metastases management and discusses various treatment controversies with focus on future clinical trials. Stereotactic radiosurgery (SRS) and whole-brain radiotherapy (WBRT) are discussed in context of multiple (4+ brain metastases) as well as new approaches combining radiation and targeted agents. A brief discussion of modified WBRT approaches, including hippocampal-avoidance WBRT (HA-WBRT) is included as well as a section on recently presented results of Radiation Therapy Oncology Group (RTOG) 0614, a randomized, double-blind, placebo-controlled trial of menantine for prevention of neurocognitive injury after WBRT. METHODS A search of selected studies relevant to management of brain metastases was performed in PubMed as well as in various published meeting abstracts. This data was collated and analyzed in context of contemporary management and future clinical trial plans. This data is presented in tabular form and discussed extensively in the text. RESULTS The published data demonstrate continued evolution of clinical trials and management strategies designed to minimize and/or prevent cognitive decline following radiation therapy management of brain metastases. Hippocampal avoidance whole-brain radiation therapy (HA-WBRT) and radiosurgery treatments for multiple brain metastases are discussed along with preliminary results of RTOG 0614, a trial of memantine therapy to prevent cognitive decline following WBRT. Trial results appear to support the use of memantine for prevention of cognitive decline. CONCLUSIONS Different management strategies for multiple brain metastases (>4 brain metastases) are currently being evaluated in prospective clinical trials to minimize the likelihood of cognitive decline following WBRT.
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Affiliation(s)
- Igor J. Barani
- Department of Radiation Oncology, University of California, San Francisco, CA, USA
| | - David A. Larson
- Department of Radiation Oncology and Neurological Surgery, University of California, San Francisco, CA, USA
| | - Mitchel S. Berger
- Department of Neurological Surgery, University of California, San Francisco, CA, USA
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Evans MS, Madhunapantula SV, Robertson GP, Drabick JJ. Current and future trials of targeted therapies in cutaneous melanoma. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 2013; 779:223-55. [PMID: 23288642 DOI: 10.1007/978-1-4614-6176-0_10] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
In order to effectively treat melanoma, targeted inhibition of key m-echanistic events regulating melanoma development such as cell proliferation, survival, angiogenesis and invasion or metastasis needs to be accomplished. The Mitogen Activated Protein Kinase (MAPK) pathway has been identified as a key player in melanoma development making this cascade an important therapeutic target. However, identification of the ideal pathway member to therapeutically target for maximal clinical benefit remains a challenge. In normal cells, the MAPK pathway relays extracellular signals from the cell membrane to the nucleus via a cascade of phosphorylation events, which promote cancer development. Dysregulation of the MAPK pathway occurs frequently in many human cancers including melanoma. Mutations in the B-RAF and RAS genes, genetic or epigenetic modifications are the key aberrations observed in this signaling cascade. Constitutive activation of this pathway causes oncogenic transformation of cells by promoting cell proliferation, invasion, metastasis, migration, survival and angiogenesis. This review provides an overview of (a) key members of MAPK signaling regulating melanoma development; (b) key proteins which can serve as biomarkers to assess disease progression; (c) the clinical efficacy of various pharmacological agents targeting MAPK pathway; (d) current clinical trials evaluating downstream targets of the MAPK pathway; (e) issues associated with pharmacological agents such as drug resistance, induction of cancers; and finally (e) various strategies overcoming drug resistance.
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Affiliation(s)
- Matthew S Evans
- Penn State Cancer Institute, Pennsylvania State University College of Medicine, Hershey, PA 17033, USA.
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BRAF mutations in melanoma and colorectal cancer: a single oncogenic mutation with different tumour phenotypes and clinical implications. Crit Rev Oncol Hematol 2012; 87:55-68. [PMID: 23246082 DOI: 10.1016/j.critrevonc.2012.11.003] [Citation(s) in RCA: 52] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2012] [Revised: 10/15/2012] [Accepted: 11/14/2012] [Indexed: 01/08/2023] Open
Abstract
BRAF is an oncogene encoding a serine-threonine protein kinase involved in the MAPK signalling cascade. BRAF acts as direct effector of RAS and through the activation of MEK, promotes tumour growth and survival. Approximately, 8% of cancers carry a BRAF mutation. However, the prevalence of this mutation varies significantly across different tumour types. There has been increasing interest in the specific role of BRAF mutations in cancer growth and progression over the last few years, especially since the clinical introduction of therapeutic BRAF inhibitors. In this paper we review the published literature on the role of BRAF mutations in melanoma and colorectal cancer, focusing on similarities and differences of BRAF mutations with respect to frequency, demographics, risk factors, mutation-associated clinico-pathologic and molecular features and clinical implications between these two diseases.
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Abstract
Since cancer is one of the leading causes of death worldwide, there is an urgent need to find better treatments. Currently, the use of chemotherapeutics remains the predominant option for cancer therapy. However, one of the major obstacles for successful cancer therapy using these chemotherapeutics is that patients often do not respond or eventually develop resistance after initial treatment. Therefore identification of genes involved in chemotherapeutic response is critical for predicting tumour response and treating drug-resistant cancer patients. A group of genes commonly lost or inactivated are tumour suppressor genes, which can promote the initiation and progression of cancer through regulation of various biological processes such as cell proliferation, cell death and cell migration/invasion. Recently, mounting evidence suggests that these tumour suppressor genes also play a very important role in the response of cancers to a variety of chemotherapeutic drugs. In the present review, we will provide a comprehensive overview on how major tumour suppressor genes [Rb (retinoblastoma), p53 family, cyclin-dependent kinase inhibitors, BRCA1 (breast-cancer susceptibility gene 1), PTEN (phosphatase and tensin homologue deleted on chromosome 10), Hippo pathway, etc.] are involved in chemotherapeutic drug response and discuss their applications in predicting the clinical outcome of chemotherapy for cancer patients. We also propose that tumour suppressor genes are critical chemotherapeutic targets for the successful treatment of drug-resistant cancer patients in future applications.
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21
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Dinosaurs and ancient civilizations: reflections on the treatment of cancer. Neoplasia 2011; 12:957-68. [PMID: 21170260 DOI: 10.1593/neo.101588] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2010] [Revised: 11/15/2010] [Accepted: 11/15/2010] [Indexed: 12/14/2022] Open
Abstract
Research efforts in the area of palaeopathology have been seen as an avenue to improve our understanding of the pathogenesis of cancer. Answers to questions of whether dinosaurs had cancer, or if cancer plagued ancient civilizations, have captured the imagination as well as the popular media. Evidence for dinosaurian cancer may indicate that cancer may have been with us from the dawn of time. Ancient recorded history suggests that past civilizations attempted to fight cancer with a variety of interventions. When contemplating the issue why a generalized cure for cancer has not been found, it might prove useful to reflect on the relatively limited time that this issue has been an agenda item of governmental attention as well as continued introduction of an every evolving myriad of manmade carcinogens relative to the total time cancer has been present on planet Earth. This article reflects on the history of cancer and the progress made following the initiation of the "era of cancer chemotherapy."
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Long GV, Menzies AM, Nagrial AM, Haydu LE, Hamilton AL, Mann GJ, Hughes TM, Thompson JF, Scolyer RA, Kefford RF. Prognostic and clinicopathologic associations of oncogenic BRAF in metastatic melanoma. J Clin Oncol 2011; 29:1239-46. [PMID: 21343559 DOI: 10.1200/jco.2010.32.4327] [Citation(s) in RCA: 791] [Impact Index Per Article: 60.8] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
PURPOSE To assess the frequency and type of oncogenic BRAF mutations in metastatic melanoma and correlate BRAF status with clinicopathologic features and outcome. PATIENTS AND METHODS Consecutive BRAF-tested Australian patients with metastatic melanoma (n = 197) were observed prospectively. A comprehensive range of clinicopathologic variables were correlated with BRAF mutation status, and a survival analysis was conducted. RESULTS Forty-eight percent of patients had a BRAF mutation; 70 patients (74%) had V600E, 19 (20%) had V600K, and six (6%) had other genotypes. Other than age at diagnosis of distant metastasis (median age, 56 v 63 years for BRAF-mutant v BRAF wild-type patients, respectively; P < .001), there was no significant difference in clinical features of patients with metastatic melanoma by mutation status. Features of the antecedent primary melanoma significantly associated with a BRAF mutation (P < .05) were histopathologic subtype, presence of mitoses, single or occult primary melanoma, truncal location, and age at diagnosis of primary tumor ≤ 50 years. The interval from diagnosis of first-ever melanoma to distant metastasis was not significantly different between BRAF-mutant and BRAF wild-type patients; however, the median survival of patients with newly diagnosed metastatic melanoma was 5.7 months for BRAF-mutant patients not treated with a BRAF inhibitor, 8.5 months for BRAF wild-type patients, and not reached for BRAF-mutant patients treated with a BRAF inhibitor. CONCLUSION V600K mutations comprised 20% of BRAF mutations. Characteristics of the antecedent primary melanoma and age at diagnosis differed in BRAF-mutant and BRAF wild-type patients. The presence of mutant BRAF had no impact on the disease-free interval from diagnosis of first-ever melanoma to first distant metastasis; however, it may have impacted survival thereafter.
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Affiliation(s)
- Georgina V Long
- Melanoma Institute Australia, 40 Rocklands Rd, North Sydney, New South Wales, 2060, Australia.
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Vakiani E, Solit DB. KRAS and BRAF: drug targets and predictive biomarkers. J Pathol 2010; 223:219-29. [PMID: 21125676 DOI: 10.1002/path.2796] [Citation(s) in RCA: 107] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2010] [Revised: 09/22/2010] [Accepted: 09/24/2010] [Indexed: 12/11/2022]
Abstract
Three decades have passed since RAS was first identified as the transformative factor in the Harvey and Kirsten strains of the mouse sarcoma virus. RAS and several of its downstream effectors, including BRAF, have since been shown to be commonly mutated in broad range of human cancers and biological studies have confirmed that RAS pathway activation promotes tumour initiation, progression and metastatic spread in many contexts. With the identification of RAS mutation as a strong predictor of clinical resistance to EGFR-targeted therapies, RAS mutational testing has been incorporated into the routine clinical care of patients with colorectal and lung cancers. This article reviews the current understanding of RAS signalling as it relates to cancer biology, current efforts to develop inhibitors of RAS and its key downstream effectors and the technical challenges of RAS mutational testing in the clinical setting.
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Affiliation(s)
- Efsevia Vakiani
- Department of Pathology, Memorial Sloan-Kettering Cancer Center, New York, NY 10021, USA
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Busch C, Geisler J, Lillehaug JR, Lønning PE. MGMT expression levels predict disease stabilisation, progression-free and overall survival in patients with advanced melanomas treated with DTIC. Eur J Cancer 2010; 46:2127-33. [PMID: 20541396 DOI: 10.1016/j.ejca.2010.04.023] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2009] [Revised: 04/23/2010] [Accepted: 04/28/2010] [Indexed: 10/19/2022]
Abstract
Metastatic melanoma responds poorly to systemic treatment. We report the results of a prospective single institution study evaluating O(6)-methylguanine-DNA methyltransferase (MGMT) status as a potential predictive and/or prognostic marker among patients treated with dacarbazine (DTIC) 800-1000 mg/m(2) monotherapy administered as a 3-weekly schedule for advanced malignant melanomas. The study was approved by the Regional Ethical Committee. Surgical biopsies from metastatic or loco-regional deposits obtained prior to DTIC treatment were snap-frozen immediately upon removal and stored in liquid nitrogen up to processing. Median time from enrolment to end of follow-up was 67 months. MGMT expression levels evaluated by qRT-PCR correlated significantly to DTIC benefit (CR/PR/SD; p=0.005), time to progression (TTP) (p=0.005) and overall survival (OS) (p=0.003). MGMT expression also correlated to Breslow thickness in the primary tumour (p=0.014). While MGMT promoter hypermethylation correlated to MGMT expression, MGMT promoter hypermethylation did not correlate to treatment benefit, TTP or OS, suggesting that other factors may be critical in determining MGMT expression levels in melanomas. In a Cox proportional regression analysis, serum lactate dehydrogenase (LDH, p<0.001), MGMT expression (p=0.022) and p16(INK4a) expression (p=0.037) independently predicted OS, while TTP correlated to DTIC benefit after 6 weeks only (p=0.001). Our data reveal MGMT expression levels to be associated with disease stabilisation and prognosis in patients receiving DTIC monotherapy for advanced melanoma. The role of MGMT expression as a predictor to DTIC sensitivity versus a general prognostic factor in advanced melanomas warrants further evaluation.
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Affiliation(s)
- Christian Busch
- Section of Oncology, Institute of Medicine, University of Bergen, Norway
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Inamdar GS, Madhunapantula SV, Robertson GP. Targeting the MAPK pathway in melanoma: why some approaches succeed and other fail. Biochem Pharmacol 2010; 80:624-37. [PMID: 20450891 DOI: 10.1016/j.bcp.2010.04.029] [Citation(s) in RCA: 144] [Impact Index Per Article: 10.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/23/2010] [Revised: 04/19/2010] [Accepted: 04/27/2010] [Indexed: 12/19/2022]
Abstract
The Mitogen Activated Protein Kinase (MAPK) pathway plays a key role in melanoma development making it an important therapeutic target. In normal cells, the tightly regulated pathway relays extracellular signals from cell membrane to nucleus via a cascade of phosphorylation events. In melanomas, dysregulation of the MAPK pathway occurs frequently due to activating mutations in the B-RAF and RAS genes or other genetic or epigenetic modifications, leading to increased signaling activity promoting cell proliferation, invasion, metastasis, migration, survival and angiogenesis. However, identification of ideal pathway member to therapeutically target for maximal clinical benefit to melanoma patients remains a challenge. This review provides an overview of the obstacles faced targeting the MAPK pathway and why certain therapeutic approaches succeed while others fail. The review summarizes the roles played by the proteins, therapeutic potential and the drugs available to target each member of the pathway as well as concerns related to each. Potential for targeting multiple points and inhibiting other pathways along with MAPK inhibition for optimal efficacy are discussed along with explanations for development of drug resistance, which includes discussions related to cross-talk between pathways, RAF kinase isoform switching and phosphatase deregulation. Finally, the use of nanotechnology is reviewed as an approach to target the MAPK pathway using both genetic and pharmacological agents simultaneously targeting multiple points in the pathway or in combination with other cascades.
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Affiliation(s)
- Gajanan S Inamdar
- Departments of Pharmacology, The Pennsylvania State University College of Medicine, Hershey, PA 17033, United States
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The War on Cancer rages on. Neoplasia 2010; 11:1252-63. [PMID: 20019833 DOI: 10.1593/neo.91866] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/03/2009] [Revised: 11/03/2009] [Accepted: 11/03/2009] [Indexed: 02/08/2023] Open
Abstract
In 1971, the "War on Cancer" was launched by the US government to cure cancer by the 200-year anniversary of the founding of the United States of America, 1976. This article briefly looks back at the progress that has been made in cancer research and compares progress made in other areas of human affliction. While progress has indeed been made, the battle continues to rage on.
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A(2B) and A(3) adenosine receptors modulate vascular endothelial growth factor and interleukin-8 expression in human melanoma cells treated with etoposide and doxorubicin. Neoplasia 2010; 11:1064-73. [PMID: 19794965 DOI: 10.1593/neo.09768] [Citation(s) in RCA: 62] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/14/2009] [Revised: 06/22/2009] [Accepted: 06/22/2009] [Indexed: 01/11/2023] Open
Abstract
Cancer patients undergoing treatment with systemic cancer chemotherapy drugs often have abnormal growth factor and cytokine profiles. Thus, serum levels of interleukin-8 (IL-8) are elevated in patients with malignant melanoma. In addition to IL-8, aggressive melanoma cells secrete, through its transcriptional regulator hypoxia-inducible factor 1 (HIF-1), vascular endothelial growth factor (VEGF), which promotes angiogenesis and metastasis of human cancerous cells. Whether these responses are related to adenosine, a ubiquitous mediator expressed at high concentrations in cancer and implicated in numerous inflammatory processes, is not known and is the focus of this study. We have examined whether the DNA-damaging agents etoposide (VP-16) and doxorubicin can affect IL-8, VEGF, and HIF-1 expressions in human melanoma cancer cells. In particular, we have investigated whether these responses are related to the modulation of the adenosine receptor subtypes, namely, A(1), A(2A), A(2B), and A(3). We have demonstrated that A(2B) receptor blockade can impair IL-8 production, whereas blocking A(3) receptors, it is possible to further decrease VEGF secretion in melanoma cells treated with VP-16 and doxorubicin. This understanding may present the possibility of using adenosine antagonists to reduce chemotherapy-induced inflammatory cytokine production and to improve the ability of chemotherapeutic drugs to block angiogenesis. Consequently, we conclude that adenosine receptor modulation may be useful for refining the use of chemotherapeutic drugs to treat human cancer more effectively.
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Zager JS, Delman KA. Commentary on pharmacotherapy of regional melanoma therapy. Expert Opin Pharmacother 2009; 11:1-3. [DOI: 10.1517/14656560903428011] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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Growth-inhibitory and antiangiogenic activity of the MEK inhibitor PD0325901 in malignant melanoma with or without BRAF mutations. Neoplasia 2009; 11:720-31. [PMID: 19649202 DOI: 10.1593/neo.09398] [Citation(s) in RCA: 81] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/26/2009] [Revised: 05/01/2009] [Accepted: 05/04/2009] [Indexed: 02/07/2023] Open
Abstract
The Raf/MEK/ERK pathway is an important mediator of tumor cell proliferation and angiogenesis. Here, we investigated the growth-inhibitory and antiangiogenic properties of PD0325901, a novel MEK inhibitor, in human melanoma cells. PD0325901 effects were determined in a panel of melanoma cell lines with different genetic aberrations. PD0325901 markedly inhibited ERK phosphorylation and growth of both BRAF mutant and wild-type melanoma cell lines, with IC(50) in the nanomolar range even in the least responsive models. Growth inhibition was observed both in vitro and in vivo in xenograft models, regardless of BRAF mutation status, and was due to G(1)-phase cell cycle arrest and subsequent induction of apoptosis. Cell cycle (cyclin D1, c-Myc, and p27(KIP1)) and apoptosis (Bcl-2 and survivin) regulators were modulated by PD0325901 at the protein level. Gene expression profiling revealed profound modulation of several genes involved in the negative control of MAPK signaling and melanoma cell differentiation, suggesting alternative, potentially relevant mechanisms of action. Finally, PD0325901 inhibited the production of the proangiogenic factors vascular endothelial growth factor and interleukin 8 at a transcriptional level. In conclusion, PD0325901 exerts potent growth-inhibitory, proapoptotic, and antiangiogenic activity in melanoma lines, regardless of their BRAF mutation status. Deeper understanding of the molecular mechanisms of action of MEK inhibitors will likely translate into more effective treatment strategies for patients experiencing malignant melanoma.
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Human melanoma cells under endoplasmic reticulum stress acquire resistance to microtubule-targeting drugs through XBP-1-mediated activation of Akt. Neoplasia 2009; 11:436-47. [PMID: 19412428 DOI: 10.1593/neo.09208] [Citation(s) in RCA: 47] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/19/2009] [Revised: 02/22/2009] [Accepted: 02/23/2009] [Indexed: 11/18/2022] Open
Abstract
Past studies have shown that melanoma cells have largely adapted to endoplasmic reticulum (ER) stress. In this study, we report that melanoma cells under ER stress are more resistant to apoptosis induced by the microtubule-targeting chemotherapeutic drugs, docetaxel and vincristine, and this is, at least in part, due to activation of the phosphoinositide 3-kinase (PI3K)/Akt pathway mediated by the X-box-binding protein 1 (XBP-1) axis of the unfolded protein response. Treatment with the ER stress-inducer tunicamycin (TM) or thapsigargin before the addition of docetaxel or vincristine reduced the levels of apoptosis induced by the drugs. This was associated with inhibition of mitochondrial release of apoptogenic proteins and activation of Bax and Bak. Induction of ER stress resulted in the rapid activation of the PI3K/Akt pathway that seemed to be important in antagonizing docetaxel and vincristine, in that inhibition of Akt blocked the effect of pretreatment with TM on apoptosis induced by the drugs. Neither docetaxel nor vincristine triggered ER stress in melanoma cells, but the basal activity of XBP-1 signaling seemed to play a role in the protection against the drugs because small interfering RNA knockdown of XBP-1 enhanced docetaxel- and vincristine-induced apoptosis. In addition, inhibition of XBP-1 decreased the constitutive levels of activation of Akt and blocked the activation of Akt induced by TM. Taken together, these results identify activation of the PI3K/Akt pathway by XBP-1-mediated signaling of the unfolded protein response as a resistance mechanism against docetaxel and vincristine in melanoma cells under ER stress.
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Loriot Y, Mordant P, Deutsch E, Olaussen KA, Soria JC. Are RAS mutations predictive markers of resistance to standard chemotherapy? Nat Rev Clin Oncol 2009; 6:528-34. [DOI: 10.1038/nrclinonc.2009.106] [Citation(s) in RCA: 73] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
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Neoplasia: the second decade. Neoplasia 2009; 10:1314-24. [PMID: 19048110 DOI: 10.1593/neo.81372] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2008] [Revised: 10/27/2008] [Accepted: 10/27/2008] [Indexed: 12/30/2022] Open
Abstract
This issue marks the end of the 10-year anniversary of Neoplasia where we have seen exciting growth in both number of submitted and published articles in Neoplasia. Neoplasia was first published in 1999. During the past 10 years, Neoplasia has dynamically adapted to the needs of the cancer research community as technologies have advanced. Neoplasia is currently providing access to articles through PubMed Central to continue to facilitate rapid broad-based dissemination of published findings to the scientific community through an Open Access model. This has in part helped Neoplasia to achieve an improved impact factor this past year, demonstrating that the manuscripts published by Neoplasia are of great interest to the overall cancer research community. This past year, Neoplasia received a record number of articles for review and has had a 21% increase in the number of published articles.
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Knauf JA, Fagin JA. Role of MAPK pathway oncoproteins in thyroid cancer pathogenesis and as drug targets. Curr Opin Cell Biol 2009; 21:296-303. [PMID: 19231149 DOI: 10.1016/j.ceb.2009.01.013] [Citation(s) in RCA: 92] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2009] [Accepted: 01/16/2009] [Indexed: 12/24/2022]
Abstract
Constitutive activation of MAPK in cancer occurs through activating mutations or overexpression of upstream effectors in the pathway, primarily of genes encoding receptor tyrosine kinases, RAS and BRAF. Arguably, the evidence for MAPK activation is most compelling in thyroid cancers and in melanomas. In this review we discuss the mechanisms of tumor development by oncogenic BRAF in these two cancer cell lineages, since this kinase signals preferentially through this pathway. We describe recent information on the mediators of BRAF-induced tumor initiation and escape from senescence. In addition, we review the biochemical events implicated in cellular growth triggered by oncogenic BRAF and the determinants of oncogene addiction. The biology of thyroid cancers induced by oncogenic BRAF is quite distinct, both in humans and in mice. There is great interest in using these insights to design rational new therapies, for which it will become crucial to understand the determinants of sensitivity and resistance to compounds designed to block the pathway. In thyroid cancer, this interest is further heightened by new information on the role of activated BRAF and MAPK pathway activation in disrupting iodine transport and thyroid hormonogenesis.
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Affiliation(s)
- Jeffrey A Knauf
- Department of Medicine and Human Oncology and Pathogenesis Program, Memorial Sloan Kettering Cancer Center, New York, NY 10065, USA
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