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Lauinger M, Christen D, Klar RFU, Roubaty C, Heilig CE, Stumpe M, Knox JJ, Radulovich N, Tamblyn L, Xie IY, Horak P, Forschner A, Bitzer M, Wittel UA, Boerries M, Ball CR, Heining C, Glimm H, Fröhlich M, Hübschmann D, Gallinger S, Fritsch R, Fröhling S, O'Kane GM, Dengjel J, Brummer T. BRAF Δβ3-αC in-frame deletion mutants differ in their dimerization propensity, HSP90 dependence, and druggability. SCIENCE ADVANCES 2023; 9:eade7486. [PMID: 37656784 DOI: 10.1126/sciadv.ade7486] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/08/2022] [Accepted: 08/02/2023] [Indexed: 09/03/2023]
Abstract
In-frame BRAF exon 12 deletions are increasingly identified in various tumor types. The resultant BRAFΔβ3-αC oncoproteins usually lack five amino acids in the β3-αC helix linker and sometimes contain de novo insertions. The dimerization status of BRAFΔβ3-αC oncoproteins, their precise pathomechanism, and their direct druggability by RAF inhibitors (RAFi) has been under debate. Here, we functionally characterize BRAFΔLNVTAP>F and two novel mutants, BRAFdelinsFS and BRAFΔLNVT>F, and compare them with other BRAFΔβ3-αC oncoproteins. We show that BRAFΔβ3-αC oncoproteins not only form stable homodimers and large multiprotein complexes but also require dimerization. Nevertheless, details matter as aromatic amino acids at the deletion junction of some BRAFΔβ3-αC oncoproteins, e.g., BRAFΔLNVTAP>F, increase their stability and dimerization propensity while conferring resistance to monomer-favoring RAFi such as dabrafenib or HSP 90/CDC37 inhibition. In contrast, dimer-favoring inhibitors such as naporafenib inhibit all BRAFΔβ3-αC mutants in cell lines and patient-derived organoids, suggesting that tumors driven by such oncoproteins are vulnerable to these compounds.
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Affiliation(s)
- Manuel Lauinger
- Institute of Molecular Medicine, ZBMZ, Faculty of Medicine, University of Freiburg, 79104 Freiburg, Germany
- Faculty of Biology, University of Freiburg, Freiburg, Germany
| | - Daniel Christen
- Institute of Molecular Medicine, ZBMZ, Faculty of Medicine, University of Freiburg, 79104 Freiburg, Germany
- Faculty of Biology, University of Freiburg, Freiburg, Germany
- German Cancer Consortium (DKTK), partner site Freiburg and German Cancer Research Center (DKFZ), 69120 Heidelberg, Germany
| | - Rhena F U Klar
- Institute of Molecular Medicine, ZBMZ, Faculty of Medicine, University of Freiburg, 79104 Freiburg, Germany
- Faculty of Biology, University of Freiburg, Freiburg, Germany
- German Cancer Consortium (DKTK), partner site Freiburg and German Cancer Research Center (DKFZ), 69120 Heidelberg, Germany
- Freeze-O Organoid Bank, University Medical Center, Faculty of Medicine, University of Freiburg, Freiburg, Germany
- Department of Internal Medicine I (Hematology, Oncology, and Stem Cell Transplantation), University Hospital of Freiburg, Freiburg, Germany
- Institute of Medical Bioinformatics and Systems Medicine (IBSM), Freiburg University Medical Center, Faculty of Medicine, University of Freiburg, Freiburg, Germany
| | - Carole Roubaty
- Department of Biology, University of Fribourg, 1700 Fribourg, Switzerland
| | - Christoph E Heilig
- Division of Translational Medical Oncology, National Center for Tumor Diseases (NCT) Heidelberg and German Cancer Research Center (DKFZ), 69120 Heidelberg, Germany
- German Cancer Consortium (DKTK), Heidelberg, Germany
| | - Michael Stumpe
- Department of Biology, University of Fribourg, 1700 Fribourg, Switzerland
| | - Jennifer J Knox
- PanCuRx Translational Research Initiative, Ontario Institute for Cancer Research, Toronto, Ontario, Canada
- Princess Margaret Cancer Centre, University Health Network, Toronto, Ontario, Canada
| | - Nikolina Radulovich
- Princess Margaret Cancer Centre, University Health Network, Toronto, Ontario, Canada
| | - Laura Tamblyn
- Princess Margaret Cancer Centre, University Health Network, Toronto, Ontario, Canada
| | - Irene Y Xie
- Princess Margaret Cancer Centre, University Health Network, Toronto, Ontario, Canada
| | - Peter Horak
- Division of Translational Medical Oncology, National Center for Tumor Diseases (NCT) Heidelberg and German Cancer Research Center (DKFZ), 69120 Heidelberg, Germany
- German Cancer Consortium (DKTK), Heidelberg, Germany
| | - Andrea Forschner
- Department of Dermatology, University Hospital of Tübingen, Tübingen, Germany
- German Cancer Consortium (DKTK), DKFZ partner site Tübingen, Eberhard Karls University, Tübingen, Germany
| | - Michael Bitzer
- German Cancer Consortium (DKTK), DKFZ partner site Tübingen, Eberhard Karls University, Tübingen, Germany
- Center for Personalized Medicine Tübingen, Eberhard Karls University, Tübingen, Germany
- Department of Internal Medicine I, Eberhard-Karls University, Tübingen, Germany
| | - Uwe A Wittel
- Department of General and Visceral Surgery, University of Freiburg Medical Center, Faculty of Medicine, 79106 Freiburg, Germany
| | - Melanie Boerries
- German Cancer Consortium (DKTK), partner site Freiburg and German Cancer Research Center (DKFZ), 69120 Heidelberg, Germany
- Institute of Medical Bioinformatics and Systems Medicine (IBSM), Freiburg University Medical Center, Faculty of Medicine, University of Freiburg, Freiburg, Germany
- Comprehensive Cancer Center Freiburg (CCCF), Medical Center, Faculty of Medicine, University of Freiburg, 79106 Freiburg, Germany
| | - Claudia R Ball
- Department for Translational Medical Oncology, National Center for Tumor Diseases (NCT/UCC), Dresden, Germany
- German Cancer Research Center (DKFZ), Heidelberg, Germany
- Faculty of Medicine and University Hospital Carl Gustav Carus, Technische Universität Dresden, Dresden, Germany
- Helmholtz-Zentrum Dresden-Rossendorf (HZDR), Dresden, Germany
- Translational Medical Oncology, Faculty of Medicine and University Hospital Carl Gustav Carus, Technische Universität Dresden, Dresden, Germany
- German Cancer Consortium (DKTK), Dresden, Germany
- Technische Universität Dresden, Faculty of Biology, Technische Universität Dresden, Dresden, Germany
| | - Christoph Heining
- Department for Translational Medical Oncology, National Center for Tumor Diseases (NCT/UCC), Dresden, Germany
- German Cancer Research Center (DKFZ), Heidelberg, Germany
- Faculty of Medicine and University Hospital Carl Gustav Carus, Technische Universität Dresden, Dresden, Germany
- Helmholtz-Zentrum Dresden-Rossendorf (HZDR), Dresden, Germany
- Translational Medical Oncology, Faculty of Medicine and University Hospital Carl Gustav Carus, Technische Universität Dresden, Dresden, Germany
- German Cancer Consortium (DKTK), Dresden, Germany
| | - Hanno Glimm
- Department for Translational Medical Oncology, National Center for Tumor Diseases (NCT/UCC), Dresden, Germany
- German Cancer Research Center (DKFZ), Heidelberg, Germany
- Faculty of Medicine and University Hospital Carl Gustav Carus, Technische Universität Dresden, Dresden, Germany
- Helmholtz-Zentrum Dresden-Rossendorf (HZDR), Dresden, Germany
- Translational Medical Oncology, Faculty of Medicine and University Hospital Carl Gustav Carus, Technische Universität Dresden, Dresden, Germany
- German Cancer Consortium (DKTK), Dresden, Germany
- Translational Functional Cancer Genomics, National Center for Tumor Diseases (NCT) and German Cancer Research Center (DKFZ), Heidelberg, Germany
| | - Martina Fröhlich
- Computational Oncology Group, Molecular Precision Oncology Program, National Center for Tumor Diseases (NCT) Heidelberg and German Cancer Research Center (DKFZ), Heidelberg, Germany
| | - Daniel Hübschmann
- German Cancer Consortium (DKTK), Heidelberg, Germany
- Computational Oncology Group, Molecular Precision Oncology Program, National Center for Tumor Diseases (NCT) Heidelberg and German Cancer Research Center (DKFZ), Heidelberg, Germany
- Pattern Recognition and Digital Medicine Group, Heidelberg Institute for Stem Cell Technology and Experimental Medicine (HI-STEM), Heidelberg, Germany
| | - Steven Gallinger
- PanCuRx Translational Research Initiative, Ontario Institute for Cancer Research, Toronto, Ontario, Canada
- Princess Margaret Cancer Centre, University Health Network, Toronto, Ontario, Canada
| | - Ralph Fritsch
- Department of Internal Medicine I (Hematology, Oncology, and Stem Cell Transplantation), University Hospital of Freiburg, Freiburg, Germany
- Department of Medical Oncology and Haematology, University Hospital of Zurich, Zurich, Switzerland
| | - Stefan Fröhling
- Division of Translational Medical Oncology, National Center for Tumor Diseases (NCT) Heidelberg and German Cancer Research Center (DKFZ), 69120 Heidelberg, Germany
- German Cancer Consortium (DKTK), Heidelberg, Germany
| | - Grainne M O'Kane
- PanCuRx Translational Research Initiative, Ontario Institute for Cancer Research, Toronto, Ontario, Canada
- Princess Margaret Cancer Centre, University Health Network, Toronto, Ontario, Canada
| | - Jörn Dengjel
- Department of Biology, University of Fribourg, 1700 Fribourg, Switzerland
| | - Tilman Brummer
- Institute of Molecular Medicine, ZBMZ, Faculty of Medicine, University of Freiburg, 79104 Freiburg, Germany
- German Cancer Consortium (DKTK), partner site Freiburg and German Cancer Research Center (DKFZ), 69120 Heidelberg, Germany
- Freeze-O Organoid Bank, University Medical Center, Faculty of Medicine, University of Freiburg, Freiburg, Germany
- Comprehensive Cancer Center Freiburg (CCCF), Medical Center, Faculty of Medicine, University of Freiburg, 79106 Freiburg, Germany
- Center for Biological Signalling Studies BIOSS, University of Freiburg, 79104 Freiburg, Germany
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Molecular Heterogeneity in BRAF-Mutant Gliomas: Diagnostic, Prognostic, and Therapeutic Implications. Cancers (Basel) 2023; 15:cancers15041268. [PMID: 36831610 PMCID: PMC9954401 DOI: 10.3390/cancers15041268] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/24/2022] [Revised: 01/25/2023] [Accepted: 02/04/2023] [Indexed: 02/19/2023] Open
Abstract
Over the last few decades, deciphering the alteration of molecular pathways in brain tumors has led to impressive changes in diagnostic refinement. Among the molecular abnormalities triggering and/or driving gliomas, alterations in the MAPK pathway reign supreme in the pediatric population, as it is encountered in almost all low-grade pediatric gliomas. Activating abnormalities in the MAPK pathway are also present in both pediatric and adult high-grade gliomas. Across those alterations, BRAF p.V600E mutations seem to define homogeneous groups of tumors in terms of prognosis. The recent development of small molecules inhibiting this pathway retains the attention of neurooncologists on BRAF-altered tumors, as conventional therapies showed no significant effect, nor prolonged efficiency on the high-grade or low-grade unresectable forms. Nevertheless, tumoral heterogeneity and especially molecular alteration(s) associated with MAPK-pathway abnormalities are not fully understood with respect to how they might lead to the specific dismal prognosis of those gliomas and/or affect their response to targeted therapies. This review is an attempt to provide comprehensive information regarding molecular alterations related to the aggressiveness modulation in BRAF-mutated gliomas and the current knowledge on how to use those targeted therapies in such situations.
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Di Nunno V, Gatto L, Tosoni A, Bartolini S, Franceschi E. Implications of BRAF V600E mutation in gliomas: Molecular considerations, prognostic value and treatment evolution. Front Oncol 2023; 12:1067252. [PMID: 36686797 PMCID: PMC9846085 DOI: 10.3389/fonc.2022.1067252] [Citation(s) in RCA: 10] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/11/2022] [Accepted: 12/12/2022] [Indexed: 01/06/2023] Open
Abstract
Gliomas are molecularly heterogeneous brain tumors responsible for the most years of life lost by any cancer. High-grade gliomas have a poor prognosis and despite multimodal treatment including surgery, radiotherapy, and chemotherapy, exhibit a high recurrence rate. There is a need for new therapeutic approaches based on precision medicine informed by biomarker assessment and BRAF, a key regulator of MAPK signaling pathway, influencing cell differentiation, proliferation, migration and pro-tumorigenic activity, is emerging as a promising molecular target. V600E, is the most frequent BRAF alteration in gliomas, especially in pediatric low-grade astrocytomas, pleomorphic xanthoastrocytoma, papillary craniopharyngioma, epithelioid glioblastoma and ganglioglioma. The possible application of BRAF-targeted therapy in gliomas is continuously growing and there is preliminary evidence of prolonged disease control obtained by BRAF inhibitors in tumors harboring BRAF V600E mutation. The possibility of introducing targeted therapies into the treatment algorithm represents a paradigm shift for patients with BRAF V600E mutant recurrent high-grade and low-grade glioma and BRAF routine testing should be considered in clinical practice. The focus of this review is to summarize the molecular landscape of BRAF across glioma subtypes and the novel therapeutic strategies for BRAF V600E mutated tumors.
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Affiliation(s)
| | - Lidia Gatto
- Department of Oncology, AUSL Bologna, Bologna, Italy,*Correspondence: Lidia Gatto,
| | - Alicia Tosoni
- Nervous System Medical Oncology Department, IRCCS Istituto delle Scienze Neurologiche di Bologna, Bologna, Italy
| | - Stefania Bartolini
- Nervous System Medical Oncology Department, IRCCS Istituto delle Scienze Neurologiche di Bologna, Bologna, Italy
| | - Enrico Franceschi
- Nervous System Medical Oncology Department, IRCCS Istituto delle Scienze Neurologiche di Bologna, Bologna, Italy
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Pan R, Wang X, Fang R, Xia Q, Wu N, Rao Q. Epithelioid glioblastoma exhibits a heterogeneous molecular feature: A targeted next-generation sequencing study. Front Oncol 2022; 12:980059. [PMID: 36505786 PMCID: PMC9730819 DOI: 10.3389/fonc.2022.980059] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/28/2022] [Accepted: 11/04/2022] [Indexed: 11/27/2022] Open
Abstract
Introduction Epithelioid glioblastoma (eGBM) is one of the rare glioblastoma (GBM) variants in the current World Health Organization (WHO) categorization of central nervous system (CNS) tumours. However, the diagnostic basis and molecular features of eGBM have not been clearly defined to date. In this study, we aimed to molecularly characterize these tumours. Methods The clinicopathological, molecular, and immunohistochemical characteristics of 12 cases of eGBM were investigated. Results The tumours were found to be made up of epithelioid and rhabdoid cells when examined under a microscope. Six cases (50%) harboured the BRAF V600E mutation, and NF1 mutation was detected in 2 eGBM cases (16.7%). CDKN2A/B homozygous deletion was seen in 5 cases (41.7%). TP53 mutation was recognized in 2 instances (16.7%), and TERT promoter mutation was recognized in 5 cases (41.7%). Discussion eGBM is characterized by high molecular heterogeneity and has molecular overlaps between low-grade gliomas. Moreover, rather than being a variant or entity, the biological significance of the "epithelioid" appearance may be reduced to a simply morphological pattern. In order to target the proper treatment to suitable patients, molecular stratification via genome-wide molecular profiling will be crucial.
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Affiliation(s)
| | | | | | | | - Nan Wu
- *Correspondence: Qiu Rao, ; Nan Wu,
| | - Qiu Rao
- *Correspondence: Qiu Rao, ; Nan Wu,
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5
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The evolution of pleomorphic xanthoastrocytoma: from genesis to molecular alterations and mimics. J Transl Med 2022; 102:670-681. [PMID: 35031693 DOI: 10.1038/s41374-021-00708-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2021] [Revised: 11/15/2021] [Accepted: 11/18/2021] [Indexed: 11/08/2022] Open
Abstract
Pleomorphic xanthoastrocytomas (PXAs) are rare tumors accounting for less than 1% of astrocytomas. They commonly occur in young patients and have relatively favorable prognosis. However, they are well known to have heterogenous morphology and biological behavior with the potential to recur and disseminate throughout the central nervous system, especially their anaplastic counterparts. Recent advances in the molecular characterization have discovered BRAFp.V600E mutations in conjunction with CDKN2A/B deletions and TERTp mutations to be the most frequent alterations in PXAs. These tumors can present a diagnostic challenge as they share overlapping histopathological, genomic as well as methylation profile with various other tumor types, particularly epithelioid glioblastomas (eGBs). This review provides the spectrum of evolution of PXAs from their genesis to recent molecular insights and attempts to review pathogenesis and relationship to other tumors that they mimic especially eGB. It is postulated based on evidence from literature that PXA and eGB are possibly related and not distinct entities, being two ends of a continuous spectrum of malignant progression (grade 2-grade 4) with anaplastic PXA (grade 3) lying in between. Future WHO classifications will have to possibly redefine these tumors using more confirmatory data from larger studies.
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6
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Kumar A, Mohamed E, Tong S, Chen K, Mukherjee J, Lim Y, Wong CM, Boosalis Z, Shai A, Pieper RO, Gupta N, Perry A, Bollen AW, Molinaro AM, Solomon DA, Shieh JTC, Phillips JJ. CXCL14 Promotes a Robust Brain Tumor-Associated Immune Response in Glioma. Clin Cancer Res 2022; 28:2898-2910. [PMID: 35511927 PMCID: PMC9250623 DOI: 10.1158/1078-0432.ccr-21-2830] [Citation(s) in RCA: 17] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2021] [Revised: 03/31/2022] [Accepted: 05/03/2022] [Indexed: 01/03/2023]
Abstract
PURPOSE The immunosuppressive tumor microenvironment present in the majority of diffuse glioma limits therapeutic response to immunotherapy. As the determinants of the glioma-associated immune response are relatively poorly understood, the study of glioma with more robust tumor-associated immune responses may be particularly useful to identify novel immunomodulatory factors that can promote T-cell effector function in glioma. EXPERIMENTAL DESIGN We used multiplex immune-profiling, proteomic profiling, and gene expression analysis to define the tumor-associated immune response in two molecular subtypes of glioma and identify factors that may modulate this response. We then used patient-derived glioma cultures and an immunocompetent murine model for malignant glioma to analyze the ability of tumor-intrinsic factors to promote a CD8+ T-cell response. RESULTS As compared with isocitrate dehydrogenase (IDH)-mutant astrocytoma, MAPK-activated pleomorphic xanthoastrocytoma (PXA) harbored increased numbers of activated cytotoxic CD8+ T cells and Iba1+ microglia/macrophages, increased MHC class I expression, enrichment of genes associated with antigen presentation and processing, and increased tumor cell secretion of the chemokine CXCL14. CXCL14 promoted activated CD8+ T-cell chemotaxis in vitro, recruited tumor-infiltrating CD8+ T cells in vivo, and prolonged overall survival in a cytotoxic T-cell-dependent manner. The immunomodulatory molecule B7-H3 was also highly expressed in PXA. CONCLUSIONS We identify the MAPK-activated lower grade astrocytoma PXA as having an immune-rich tumor microenvironment and suggest this tumor may be particularly vulnerable to immunotherapeutic modulation. We also identify CXCL14 as an important determinant of the glioma-associated immune microenvironment, sufficient to promote an antitumor CD8+ T-cell response.
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Affiliation(s)
- Anupam Kumar
- Brain Tumor Center, Department of Neurological Surgery, Weill Institute for Neurosciences, University of California San Francisco, San Francisco, California
| | - Esraa Mohamed
- Brain Tumor Center, Department of Neurological Surgery, Weill Institute for Neurosciences, University of California San Francisco, San Francisco, California
| | - Schuyler Tong
- Department of Hematology Oncology, UCSF Benioff Children's Hospital - Oakland, University of California San Francisco, Oakland, California
| | - Katharine Chen
- Brain Tumor Center, Department of Neurological Surgery, Weill Institute for Neurosciences, University of California San Francisco, San Francisco, California
| | - Joydeep Mukherjee
- Brain Tumor Center, Department of Neurological Surgery, Weill Institute for Neurosciences, University of California San Francisco, San Francisco, California
| | - Yunita Lim
- Brain Tumor Center, Department of Neurological Surgery, Weill Institute for Neurosciences, University of California San Francisco, San Francisco, California
| | - Cynthia M Wong
- Brain Tumor Center, Department of Neurological Surgery, Weill Institute for Neurosciences, University of California San Francisco, San Francisco, California
| | - Zoe Boosalis
- Brain Tumor Center, Department of Neurological Surgery, Weill Institute for Neurosciences, University of California San Francisco, San Francisco, California
| | - Anny Shai
- Brain Tumor Center, Department of Neurological Surgery, Weill Institute for Neurosciences, University of California San Francisco, San Francisco, California
| | - Russell O Pieper
- Brain Tumor Center, Department of Neurological Surgery, Weill Institute for Neurosciences, University of California San Francisco, San Francisco, California
| | - Nalin Gupta
- Brain Tumor Center, Department of Neurological Surgery, Weill Institute for Neurosciences, University of California San Francisco, San Francisco, California
| | - Arie Perry
- Brain Tumor Center, Department of Neurological Surgery, Weill Institute for Neurosciences, University of California San Francisco, San Francisco, California
- Division of Neuropathology, Departments of Pathology and Laboratory Medicine, University of California San Francisco, San Francisco, California
| | - Andrew W Bollen
- Division of Neuropathology, Departments of Pathology and Laboratory Medicine, University of California San Francisco, San Francisco, California
| | - Annette M Molinaro
- Brain Tumor Center, Department of Neurological Surgery, Weill Institute for Neurosciences, University of California San Francisco, San Francisco, California
| | - David A Solomon
- Division of Neuropathology, Departments of Pathology and Laboratory Medicine, University of California San Francisco, San Francisco, California
| | - Joseph T C Shieh
- Division of Medical Genetics, Department of Pediatrics, UCSF Benioff Children's Hospital, University of California San Francisco, San Francisco, California
- Institute for Human Genetics, University of California San Francisco, San Francisco, California
| | - Joanna J Phillips
- Brain Tumor Center, Department of Neurological Surgery, Weill Institute for Neurosciences, University of California San Francisco, San Francisco, California
- Division of Neuropathology, Departments of Pathology and Laboratory Medicine, University of California San Francisco, San Francisco, California
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Rayi A, Alnahhas I, Ong S, Giglio P, Puduvalli VK. Targeted Therapy for BRAF Mutant Brain Tumors. Curr Treat Options Oncol 2021; 22:105. [PMID: 34613491 DOI: 10.1007/s11864-021-00901-9] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 07/16/2021] [Indexed: 12/23/2022]
Abstract
OPINION STATEMENT Molecular heterogeneity has confounded attempts to target individual pathways in brain tumors. However, gliomas with BRAF mutations have been identified as being uniquely vulnerable to targeted therapies. Such mutations are predominantly seen in brain tumors of the adolescent and young adult population. Given that accurate and timely identification of such mutations is essential for offering appropriate treatment, treatment centers should offer both immunohistochemical and sequencing methods for detection of these mutations to guide treatment. Additional studies of these tumors at recurrence would also allow identification of breakthrough resistance mechanisms that may also be targetable for treatment. Due to the relative rarity of these tumors, multicenter collaborative studies will be essential in achieving long term control of these tumors.
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Affiliation(s)
- Appaji Rayi
- Department of Neurology, Charleston Area Medical Center, Charleston, WV, USA
| | - Iyad Alnahhas
- Division of Neuro-Oncology, Department of Neurology, Thomas Jefferson University, Philadelphia, PA, USA
| | - Shirley Ong
- Division of Neuro-Oncology, Department of Neurology, The Ohio State University Wexner Medical Center, Columbus, OH, USA
| | - Pierre Giglio
- Division of Neuro-Oncology, Department of Neurology, The Ohio State University Wexner Medical Center, Columbus, OH, USA
| | - Vinay K Puduvalli
- Department of Neuro-Oncology, MD Anderson Cancer Center, 1515 Holcombe Blvd, Unit 431, Houston, TX, 77030, USA.
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Lin CC, Lefferts JA, Chan AM, Zanazzi G. Rare Activating BRAF Alteration Involving the β3-αC Kinase Domain in Ganglioglioma. J Neuropathol Exp Neurol 2021; 80:887-889. [PMID: 33611593 PMCID: PMC8786492 DOI: 10.1093/jnen/nlab013] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- Chun-Chieh Lin
- Department of Pathology and Laboratory Medicine, Dartmouth-Hitchcock Medical Center, Lebanon, New Hampshire, USA
| | - Joel A Lefferts
- Department of Pathology and Laboratory Medicine, Dartmouth-Hitchcock Medical Center, Lebanon, New Hampshire, USA
| | - Amy M Chan
- Department of Medicine, Section of Hematology-Oncology, Dartmouth-Hitchcock Medical Center, Lebanon, New Hampshire, USA
| | - George Zanazzi
- Department of Pathology and Laboratory Medicine, Dartmouth-Hitchcock Medical Center, Lebanon, New Hampshire, USA
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Zhang B, Chen Y, Dai P, Yu H, Ma J, Chen C, Zhang Y, Guan Y, Chen R, Liu T, Wang J, Yang L, Yi X, Xia X, Ma H. Oncogenic mutations within the β3-αC loop of EGFR/ERBB2/BRAF/MAP2K1 predict response to therapies. Mol Genet Genomic Med 2020; 8:e1395. [PMID: 32757330 PMCID: PMC7549570 DOI: 10.1002/mgg3.1395] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/21/2020] [Revised: 05/31/2020] [Accepted: 06/08/2020] [Indexed: 12/13/2022] Open
Abstract
Background β3‐αC loop is a highly conserved structural domain across oncogene families, which is a switch for kinase activity. There have been numerous researches on mutations within β3‐αC loop in EGFR, but relatively less in ERBB2, BRAF, and MAP2K1. In addition, previous studies mainly focus on β3‐αC deletion in EGFR, which is the most common type affecting kinase activity and driving lung cancer. Other mutation types are not well studied. Methods Here we analyzed the profile of β3‐αC loop mutations in a total of 10,000 tumor biopsy and/or ctDNA patient samples using hybridization capture‐based next‐generation sequencing. Results We identified 1616 mutations within β3‐αC loop in this cohort. Most mutations were located in EGFR, with less percentage in ERBB2, BRAF, and MAP2K1. EGFR β3‐αC deletions occurred at a high percentage of 96.7% and were all drug‐relevant. We also detected rare EGFR β3‐αC insertions and point mutations, most of which were related to EGFR TKIs resistance. ERBB2 β3‐αC deletions were only found in breast cancers and sensitive to EGFR/ERBB2 inhibitor. Moreover, BRAF and MAP2K1 mutations within β3‐αC loop also demonstrated drugs relevance. Conclusion Our study showed that oncogenic mutations within the β3‐αC loop of ERBB2, MAP2K1, and BRAF are analogous to that of EGFR, which have profound effect on drug response. Understanding the mutation profile within the β3‐αC loop is critical for targeted therapies.
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Affiliation(s)
- Biao Zhang
- Department of Thoracic Surgery, The First Affiliated Hospital of Soochow University, Suzhou, China
| | - Yongsheng Chen
- Geneplus-Beijing, Beijing, China.,Department of Computer Science and Technology, School of Electronic and Information Engineering, Xi'an Jiaotong University, Xi'an, China
| | - Pingping Dai
- Geneplus-Beijing, Beijing, China.,Department of Computer Science and Technology, School of Electronic and Information Engineering, Xi'an Jiaotong University, Xi'an, China
| | - Haoda Yu
- Department of Respiratory Medicine, Wuxi People's Hospital, Wuxi, China
| | | | - Chen Chen
- Geneplus-Beijing, Beijing, China.,Department of Computer Science and Technology, School of Electronic and Information Engineering, Xi'an Jiaotong University, Xi'an, China
| | - Yan Zhang
- Geneplus-Beijing, Beijing, China.,Department of Computer Science and Technology, School of Electronic and Information Engineering, Xi'an Jiaotong University, Xi'an, China
| | - Yanfang Guan
- Geneplus-Beijing, Beijing, China.,Department of Computer Science and Technology, School of Electronic and Information Engineering, Xi'an Jiaotong University, Xi'an, China
| | | | - Tao Liu
- Geneplus-Beijing, Beijing, China.,Department of Computer Science and Technology, School of Electronic and Information Engineering, Xi'an Jiaotong University, Xi'an, China
| | - Jiayin Wang
- Department of Computer Science and Technology, School of Electronic and Information Engineering, Xi'an Jiaotong University, Xi'an, China
| | | | - Xin Yi
- Geneplus-Beijing, Beijing, China
| | | | - Haitao Ma
- Department of Thoracic Surgery, The First Affiliated Hospital of Soochow University, Suzhou, China
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Vaubel R, Zschernack V, Tran QT, Jenkins S, Caron A, Milosevic D, Smadbeck J, Vasmatzis G, Kandels D, Gnekow A, Kramm C, Jenkins R, Kipp BR, Rodriguez FJ, Orr BA, Pietsch T, Giannini C. Biology and grading of pleomorphic xanthoastrocytoma-what have we learned about it? Brain Pathol 2020; 31:20-32. [PMID: 32619305 PMCID: PMC8018001 DOI: 10.1111/bpa.12874] [Citation(s) in RCA: 26] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/07/2020] [Revised: 06/09/2020] [Accepted: 06/16/2020] [Indexed: 02/06/2023] Open
Abstract
Pleomorphic xanthoastrocytoma (PXA) is a rare astrocytoma predominantly affecting children and young adults. We performed comprehensive genomic characterization on a cohort of 67 patients with histologically defined PXA (n = 53, 79%) or anaplastic PXA (A-PXA, n = 14, 21%), including copy number analysis (ThermoFisher Oncoscan, n = 67), methylation profiling (Illumina EPIC array, n = 43) and targeted next generation sequencing (n = 32). The most frequent alterations were CDKN2A/B deletion (n = 63; 94%) and BRAF p.V600E (n = 51, 76.1%). In 7 BRAF p.V600 wild-type cases, alternative driver alterations were identified involving BRAF, RAF1 and NF1. Downstream phosphorylation of ERK kinase was uniformly present. Additional pathogenic alterations were rare, with TERT, ATRX and TP53 mutations identified in a small number of tumors, predominantly A-PXA. Methylation-based classification of 46 cases utilizing a comprehensive reference tumor allowed assignment to the PXA methylation class in 40 cases. A minority grouped with the methylation classes of ganglioglioma or pilocytic astrocytoma (n = 2), anaplastic pilocytic astrocytoma (n = 2) or control tissues (n = 2). In 9 cases, tissue was available from matched primary and recurrent tumors, including 8 with anaplastic transformation. At recurrence, two tumors acquired TERT promoter mutations and the majority demonstrated additional non-recurrent copy number alterations. Methylation class was preserved at recurrence. For 62 patients (92.5%), clinical follow-up data were available (median follow-up, 5.4 years). Overall survival was significantly different between PXA and A-PXA (5-year OS 80.8% vs. 47.6%; P = 0.0009) but not progression-free survival (5-year PFS 59.9% vs. 39.8%; P = 0.05). WHO grade remained a strong predictor of overall survival when limited to 38 cases defined as PXA by methylation-based classification. Our data confirm the importance of WHO grading in histologically and epigenetically defined PXA. Methylation-based classification may be helpful in cases with ambiguous morphology, but is largely confirmatory in PXA with well-defined morphology.
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Affiliation(s)
- Rachael Vaubel
- Department of Laboratory Medicine and Pathology, Mayo Clinic, Rochester, MN, USA
| | - Valentina Zschernack
- Institute of Neuropathology, DGNN Brain Tumor Reference Center, University of Bonn, Bonn, Germany
| | - Quynh T Tran
- Department of Pathology, St. Jude Children's Research Hospital, Memphis, TN, USA
| | - Sarah Jenkins
- Division of Biomedical Statistics and Informatics, Mayo Clinic, Rochester, MN, USA
| | - Alissa Caron
- Department of Laboratory Medicine and Pathology, Mayo Clinic, Rochester, MN, USA
| | - Dragana Milosevic
- Department of Laboratory Medicine and Pathology, Mayo Clinic, Rochester, MN, USA
| | - James Smadbeck
- Center for Individualized Medicine, Mayo Clinic, Rochester, MN, USA
| | - George Vasmatzis
- Center for Individualized Medicine, Mayo Clinic, Rochester, MN, USA
| | - Daniela Kandels
- Swabian Children's Cancer Center, University Hospital Augsburg, Augsburg, Germany
| | - Astrid Gnekow
- Swabian Children's Cancer Center, University Hospital Augsburg, Augsburg, Germany
| | - Christof Kramm
- Division of Pediatric Hematology and Oncology, University of Goettingen, Goettingen, Germany
| | - Robert Jenkins
- Department of Laboratory Medicine and Pathology, Mayo Clinic, Rochester, MN, USA
| | - Benjamin R Kipp
- Department of Laboratory Medicine and Pathology, Mayo Clinic, Rochester, MN, USA
| | - Fausto J Rodriguez
- Division of Neuropathology, Department of Pathology, Johns Hopkins Hospital, Baltimore, MD, USA
| | - Brent A Orr
- Department of Pathology, St. Jude Children's Research Hospital, Memphis, TN, USA
| | - Torsten Pietsch
- Institute of Neuropathology, DGNN Brain Tumor Reference Center, University of Bonn, Bonn, Germany
| | - Caterina Giannini
- Department of Laboratory Medicine and Pathology, Mayo Clinic, Rochester, MN, USA.,Anatomic Pathology, Dipartimento di Scienze Biomediche e NeuroMotorie - DIBINEM, Alma Mater Studiorum - Università di Bologna, Bologna, Italy
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Schreck KC, Patel MP, Wemmer J, Grossman SA, Peters KB. RAF and MEK inhibitor therapy in adult patients with brain tumors: a case-based overview and practical management of adverse events. Neurooncol Pract 2020; 7:369-375. [PMID: 32765888 DOI: 10.1093/nop/npaa006] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022] Open
Abstract
Targeted therapy has gained mainstream attention with notable successes against specific genetic mutations in many cancers. One particular mutation, the BRAF V600E mutation, is present in a small subset of gliomas in adults. Although clinical experience and trial data of RAF-targeted therapy in adults with glioma are lacking at this time, the poor prognosis of adult high-grade glioma has led neuro-oncology practitioners to consider the use of targeted therapy in these patients. In this manuscript, we describe the use of RAF and MEK inhibitors in adults with recurrent glioma. We discuss the utility of these agents, describe their toxicities, and give examples of management strategies. Given the significant toxicities of RAF and MEK inhibitors, along with the long potential duration of treatment, neuro-oncology providers should counsel patients carefully before initiating therapy and monitor them closely while undergoing treatment with RAF-targeted therapy.
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Affiliation(s)
- Karisa C Schreck
- Department of Neurology, Johns Hopkins University School of Medicine, Baltimore, Maryland, USA.,Sidney Kimmel Comprehensive Cancer Center, Baltimore, Maryland, USA
| | - Mallika P Patel
- The Preston Robert Tisch Brain Tumor Center, Duke University Medical Center, Durham, North Carolina, USA
| | - Jan Wemmer
- Sidney Kimmel Comprehensive Cancer Center, Baltimore, Maryland, USA
| | | | - Katherine B Peters
- The Preston Robert Tisch Brain Tumor Center, Duke University Medical Center, Durham, North Carolina, USA
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Schreck KC, Grossman SA, Pratilas CA. BRAF Mutations and the Utility of RAF and MEK Inhibitors in Primary Brain Tumors. Cancers (Basel) 2019; 11:E1262. [PMID: 31466300 PMCID: PMC6769482 DOI: 10.3390/cancers11091262] [Citation(s) in RCA: 92] [Impact Index Per Article: 18.4] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2019] [Revised: 08/22/2019] [Accepted: 08/24/2019] [Indexed: 12/19/2022] Open
Abstract
BRAF mutations have been identified as targetable, oncogenic mutations in many cancers. Given the paucity of treatments for primary brain tumors and the poor prognosis associated with high-grade gliomas, BRAF mutations in glioma are of considerable interest. In this review, we present the spectrum of BRAF mutations and fusion alterations present in each class of primary brain tumor based on publicly available databases and publications. We also summarize clinical experience with RAF and MEK inhibitors in patients with primary brain tumors and describe ongoing clinical trials of RAF inhibitors in glioma. Sensitivity to RAF and MEK inhibitors varies among BRAF mutations and between tumor types as only class I BRAF V600 mutations are sensitive to clinically available RAF inhibitors. While class II and III BRAF mutations are found in primary brain tumors, further research is necessary to determine their sensitivity to third-generation RAF inhibitors and/or MEK inhibitors. We recommend that the neuro-oncologist consider using these drugs primarily in the setting of a clinical trial for patients with BRAF-altered glioma in order to advance our knowledge of their efficacy in this patient population.
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Affiliation(s)
- Karisa C Schreck
- Department of Neurology, Johns Hopkins University School of Medicine, Baltimore, MD 21287, USA.
- Department of Oncology, Sidney Kimmel Comprehensive Cancer Center, Baltimore, MD 21287, USA.
| | - Stuart A Grossman
- Department of Oncology, Sidney Kimmel Comprehensive Cancer Center, Baltimore, MD 21287, USA
| | - Christine A Pratilas
- Department of Oncology, Sidney Kimmel Comprehensive Cancer Center, Baltimore, MD 21287, USA
- Department of Pediatrics, Johns Hopkins University School of Medicine, Baltimore, MD 21287, USA
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13
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Anaplastic Pleomorphic Xanthoastrocytoma Presenting with Musical Hallucination. Case Rep Neurol Med 2018; 2018:6428492. [PMID: 30534452 PMCID: PMC6252228 DOI: 10.1155/2018/6428492] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2018] [Revised: 10/15/2018] [Accepted: 10/30/2018] [Indexed: 02/05/2023] Open
Abstract
Musical hallucinations are a relatively rare form of auditory hallucination characterized by hearing of music in the absence of any external stimuli. This phenomenon has been linked to both psychiatric and structural lesions. We present the case of a previously healthy young male whose presentation with musical hallucinations led to the diagnosis of a rare tumour, anaplastic pleomorphic xanthoastrocytoma.
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