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Huang Y, Qin Y, He Y, Qiu D, Zheng Y, Wei J, Zhang L, Yang DH, Li Y. Advances in molecular targeted drugs in combination with CAR-T cell therapy for hematologic malignancies. Drug Resist Updat 2024; 74:101082. [PMID: 38569225 DOI: 10.1016/j.drup.2024.101082] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/04/2023] [Revised: 03/03/2024] [Accepted: 03/22/2024] [Indexed: 04/05/2024]
Abstract
Molecular targeted drugs and chimeric antigen receptor (CAR) T cell therapy represent specific biological treatments that have significantly improved the efficacy of treating hematologic malignancies. However, they face challenges such as drug resistance and recurrence after treatment. Combining molecular targeted drugs and CAR-T cells could regulate immunity, improve tumor microenvironment (TME), promote cell apoptosis, and enhance sensitivity to tumor cell killing. This approach might provide a dual coordinated attack on cancer cells, effectively eliminating minimal residual disease and overcoming therapy resistance. Moreover, molecular targeted drugs can directly or indirectly enhance the anti-tumor effect of CAR-T cells by inducing tumor target antigen expression, reversing CAR-T cell exhaustion, and reducing CAR-T cell associated toxic side effects. Therefore, combining molecular targeted drugs with CAR-T cells is a promising and novel tactic for treating hematologic malignancies. In this review article, we focus on analyzing the mechanism of therapy resistance and its reversal of CAR-T cell therapy resistance, as well as the synergistic mechanism, safety, and future challenges in CAR-T cell therapy in combination with molecular targeted drugs. We aim to explore the benefits of this combination therapy for patients with hematologic malignancies and provide a rationale for subsequent clinical studies.
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Affiliation(s)
- Yuxian Huang
- Department of Hematology, Zhujiang Hospital, Southern Medical University, Guangzhou 510282, Guangdong, China.
| | - Yinjie Qin
- Department of Hematology, Zhujiang Hospital, Southern Medical University, Guangzhou 510282, Guangdong, China
| | - Yingzhi He
- Department of Hematology, Zhujiang Hospital, Southern Medical University, Guangzhou 510282, Guangdong, China
| | - Dezhi Qiu
- Department of Hematology, Zhujiang Hospital, Southern Medical University, Guangzhou 510282, Guangdong, China
| | - Yeqin Zheng
- Department of Hematology, Zhujiang Hospital, Southern Medical University, Guangzhou 510282, Guangdong, China
| | - Jiayue Wei
- Department of Hematology, Zhujiang Hospital, Southern Medical University, Guangzhou 510282, Guangdong, China
| | - Lenghe Zhang
- Department of Hematology, Zhujiang Hospital, Southern Medical University, Guangzhou 510282, Guangdong, China
| | - Dong-Hua Yang
- New York College of Traditional Chinese Medicine, Mineola, NY, USA.
| | - Yuhua Li
- Department of Hematology, Zhujiang Hospital, Southern Medical University, Guangzhou 510282, Guangdong, China.
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2
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Maymí VI, Zhu H, Jager M, Johnson S, Getchell R, Casey JW, Grenier JK, Wherry EJ, Smith NL, Grimson A, Rudd BD. Neonatal CD8+ T Cells Resist Exhaustion during Chronic Infection. JOURNAL OF IMMUNOLOGY (BALTIMORE, MD. : 1950) 2024; 212:834-843. [PMID: 38231127 DOI: 10.4049/jimmunol.2300396] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/12/2023] [Accepted: 01/01/2024] [Indexed: 01/18/2024]
Abstract
Chronic viral infections, such as HIV and hepatitis C virus, represent a major public health problem. Although it is well understood that neonates and adults respond differently to chronic viral infections, the underlying mechanisms remain unknown. In this study, we transferred neonatal and adult CD8+ T cells into a mouse model of chronic infection (lymphocytic choriomeningitis virus clone 13) and dissected out the key cell-intrinsic differences that alter their ability to protect the host. Interestingly, we found that neonatal CD8+ T cells preferentially became effector cells early in chronic infection compared with adult CD8+ T cells and expressed higher levels of genes associated with cell migration and effector cell differentiation. During the chronic phase of infection, the neonatal cells retained more immune functionality and expressed lower levels of surface markers and genes related to exhaustion. Because the neonatal cells protect from viral replication early in chronic infection, the altered differentiation trajectories of neonatal and adult CD8+ T cells is functionally significant. Together, our work demonstrates how cell-intrinsic differences between neonatal and adult CD8+ T cells influence key cell fate decisions during chronic infection.
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Affiliation(s)
- Viviana I Maymí
- Department of Microbiology and Immunology, Cornell University, Ithaca, NY
| | - Hongya Zhu
- Department of Molecular Biology and Genetics, Cornell University, Ithaca, NY
| | - Mason Jager
- Department of Population Medicine and Diagnostic Sciences, Cornell University, Ithaca, NY
| | - Shawn Johnson
- Department of Microbiology and Immunology, Cornell University, Ithaca, NY
| | - Rodman Getchell
- Department of Microbiology and Immunology, Cornell University, Ithaca, NY
| | - James W Casey
- Department of Microbiology and Immunology, Cornell University, Ithaca, NY
| | - Jennifer K Grenier
- Transcriptional Regulation and Expression Facility, Department of Biomedical Sciences, Cornell University, Ithaca, NY
| | - E John Wherry
- Institute for Immunology and Immune Health and Department of Systems Pharmacology and Translational Therapeutics, University of Pennsylvania Perelman School of Medicine, Philadelphia, PA
| | - Norah L Smith
- Department of Microbiology and Immunology, Cornell University, Ithaca, NY
| | - Andrew Grimson
- Department of Molecular Biology and Genetics, Cornell University, Ithaca, NY
| | - Brian D Rudd
- Department of Microbiology and Immunology, Cornell University, Ithaca, NY
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3
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Costa PMDS, Sales SLA, Pinheiro DP, Pontes LQ, Maranhão SS, Pessoa CDÓ, Furtado GP, Furtado CLM. Epigenetic reprogramming in cancer: From diagnosis to treatment. Front Cell Dev Biol 2023; 11:1116805. [PMID: 36866275 PMCID: PMC9974167 DOI: 10.3389/fcell.2023.1116805] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2022] [Accepted: 02/01/2023] [Indexed: 02/16/2023] Open
Abstract
Disruption of the epigenetic program of gene expression is a hallmark of cancer that initiates and propagates tumorigenesis. Altered DNA methylation, histone modifications and ncRNAs expression are a feature of cancer cells. The dynamic epigenetic changes during oncogenic transformation are related to tumor heterogeneity, unlimited self-renewal and multi-lineage differentiation. This stem cell-like state or the aberrant reprogramming of cancer stem cells is the major challenge in treatment and drug resistance. Given the reversible nature of epigenetic modifications, the ability to restore the cancer epigenome through the inhibition of the epigenetic modifiers is a promising therapy for cancer treatment, either as a monotherapy or in combination with other anticancer therapies, including immunotherapies. Herein, we highlighted the main epigenetic alterations, their potential as a biomarker for early diagnosis and the epigenetic therapies approved for cancer treatment.
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Affiliation(s)
- Pedro Mikael da Silva Costa
- Department of Physiology and Pharmacology, Drug Research and Development Center, Federal University of Ceará, Fortaleza, Ceará, Brazil,Postgraduation Program in Biotechnology Northeastern Network of Biotechnology, Federal University of Ceará, Fortaleza, Ceará, Brazil
| | - Sarah Leyenne Alves Sales
- Department of Physiology and Pharmacology, Drug Research and Development Center, Federal University of Ceará, Fortaleza, Ceará, Brazil,Postgraduation Program in Pharmacology, Federal University of Ceará, Fortaleza, Ceará, Brazil
| | | | - Larissa Queiroz Pontes
- Oswaldo Cruz Foundation, FIOCRUZ-Ceará, Sector of Biotechnology, Eusebio, Ceará, Brazil,Postgraduation Program in Biotechnology and Natural Resources, Federal University of Ceará, Fortaleza, Ceará, Brazil
| | - Sarah Sant’Anna Maranhão
- Department of Physiology and Pharmacology, Drug Research and Development Center, Federal University of Ceará, Fortaleza, Ceará, Brazil
| | - Claudia do Ó. Pessoa
- Department of Physiology and Pharmacology, Drug Research and Development Center, Federal University of Ceará, Fortaleza, Ceará, Brazil,Postgraduation Program in Biotechnology Northeastern Network of Biotechnology, Federal University of Ceará, Fortaleza, Ceará, Brazil,Postgraduation Program in Pharmacology, Federal University of Ceará, Fortaleza, Ceará, Brazil
| | - Gilvan Pessoa Furtado
- Oswaldo Cruz Foundation, FIOCRUZ-Ceará, Sector of Biotechnology, Eusebio, Ceará, Brazil,Postgraduation Program in Biotechnology and Natural Resources, Federal University of Ceará, Fortaleza, Ceará, Brazil
| | - Cristiana Libardi Miranda Furtado
- Drug Research and Development Center, Postgraduate Program in Translational Medicine, Federal University of Ceará, Fortaleza, Ceará, Brazil,Experimental Biology Center, University of Fortaleza, Fortaleza, Ceará, Brazil,*Correspondence: Cristiana Libardi Miranda Furtado,
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4
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Weiss DJ, Rolandsson Enes S. MSCs interaction with the host lung microenvironment: An overlooked aspect? Front Immunol 2022; 13:1072257. [DOI: 10.3389/fimmu.2022.1072257] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/17/2022] [Accepted: 10/31/2022] [Indexed: 11/17/2022] Open
Abstract
Mesenchymal stromal cells (MSCs) were identified more than 50 years ago, and research advances have promoted the translation of pre-clinical studies into clinical settings in several diseases. However, we are only starting to uncover the local factors that regulate cell phenotype, cell function, and cell viability across tissues following administration in different diseases. Advances in pre-clinical and translational studies suggest that the host environment, especially inflammatory active environments, plays a significant role in directing the infused MSCs towards different phenotypes with different functions. This can significantly effect their therapeutic efficacy. One way to study this interaction between the host environment and the infused cells is to expose MSCs ex vivo to patient samples such as serum or bronchoalveolar lavage fluid. Using this approach, it has been demonstrated that MSCs are very sensitive to different host factors such as pathogens, inflammatory cytokines, and extra cellular matrix properties. By understanding how different local host factors effect MSC function it will open possibilities to select specific patient sub-groups that are more likely to respond to this type of treatment and will also open possibilities to prime the local host environment to increase viability and to enrich for a specific MSC phenotype. Here, we aim to review the current understanding of the interaction of MSCs with the host microenvironment. To narrow the scope of this mini review, the focus will be on the pulmonary microenvironment, with a specific focus on the diseases acute respiratory distress syndrome (ARDS) and cystic fibrosis (CF).
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Tang TCY, Xu N, Nordon R, Haber M, Micklethwaite K, Dolnikov A. Donor T cells for CAR T cell therapy. Biomark Res 2022; 10:14. [PMID: 35365224 PMCID: PMC8973942 DOI: 10.1186/s40364-022-00359-3] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2021] [Accepted: 02/26/2022] [Indexed: 01/01/2023] Open
Abstract
Adoptive cell therapy using patient-derived chimeric receptor antigen (CAR) T cells redirected against tumor cells has shown remarkable success in treating hematologic cancers. However, wider accessibility of cellular therapies for all patients is needed. Manufacture of patient-derived CAR T cells is limited by prolonged lymphopenia in heavily pre-treated patients and risk of contamination with tumor cells when isolating T cells from patient blood rich in malignant blasts. Donor T cells provide a good source of immune cells for adoptive immunotherapy and can be used to generate universal off-the-shelf CAR T cells that are readily available for administration into patients as required. Genome editing tools such as TALENs and CRISPR-Cas9 and non-gene editing methods such as short hairpin RNA and blockade of protein expression are currently used to enhance CAR T cell safety and efficacy by abrogating non-specific toxicity in the form of graft versus host disease (GVHD) and preventing CAR T cell rejection by the host.
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Affiliation(s)
- Tiffany C Y Tang
- Graduate School of Biomedical Engineering, Faculty of Engineering, UNSW Sydney, Sydney, NSW, Australia. .,Children's Cancer Institute, Lowy Cancer Research Center, UNSW Sydney, Sydney, NSW, Australia.
| | - Ning Xu
- Children's Cancer Institute, Lowy Cancer Research Center, UNSW Sydney, Sydney, NSW, Australia.,School of Women's and Children's Health, Faculty of Medicine, UNSW Sydney, Sydney, NSW, Australia
| | - Robert Nordon
- Graduate School of Biomedical Engineering, Faculty of Engineering, UNSW Sydney, Sydney, NSW, Australia
| | - Michelle Haber
- Children's Cancer Institute, Lowy Cancer Research Center, UNSW Sydney, Sydney, NSW, Australia.,School of Women's and Children's Health, Faculty of Medicine, UNSW Sydney, Sydney, NSW, Australia.,Kids Cancer Center, Sydney Children's Hospital, Sydney, NSW, Australia
| | - Kenneth Micklethwaite
- Blood Transplant and Cell Therapies Program, Department of Hematology, Westmead Hospital, Sydney, NSW, Australia.,Blood Transplant and Cell Therapies Laboratory, NSW Health Pathology, ICPMR Westmead, Sydney, NSW, Australia.,Westmead Institute for Medical Research, Sydney, NSW, Australia.,Sydney Medical School, The University of Sydney, Sydney, NSW, Australia
| | - Alla Dolnikov
- Children's Cancer Institute, Lowy Cancer Research Center, UNSW Sydney, Sydney, NSW, Australia.,School of Women's and Children's Health, Faculty of Medicine, UNSW Sydney, Sydney, NSW, Australia.,Kids Cancer Center, Sydney Children's Hospital, Sydney, NSW, Australia
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Current Limitations and Perspectives of Chimeric Antigen Receptor-T-Cells in Acute Myeloid Leukemia. Cancers (Basel) 2021; 13:cancers13246157. [PMID: 34944782 PMCID: PMC8699597 DOI: 10.3390/cancers13246157] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2021] [Revised: 11/22/2021] [Accepted: 11/25/2021] [Indexed: 12/11/2022] Open
Abstract
Simple Summary Acute myeloid leukemia (AML) is the most frequent type of acute leukemia in adults. Allogeneic hematopoietic cell transplantation (allo-HCT) has been the only potentially curative treatment for the majority of patients. The ability of chimeric antigen receptor (CAR)-modified T-cell therapy directed against the CD19 antigen to induce durable remissions in patients with acute lymphoblastic leukemia (ALL) has provided optimism that this novel treatment paradigm can be extrapolated to AML. In this review, we provide an overview of candidate target antigens for CAR-T-cells in AML, an update on recent progress in preclinical and clinical development of investigational CAR-T-cell products, and discuss challenges for the clinical implementation of CAR-T-cell therapy in AML. Abstract Adoptive transfer of gene-engineered chimeric antigen receptor (CAR)-T-cells has emerged as a powerful immunotherapy for combating hematologic cancers. Several target antigens that are prevalently expressed on AML cells have undergone evaluation in preclinical CAR-T-cell testing. Attributes of an ‘ideal’ target antigen for CAR-T-cell therapy in AML include high-level expression on leukemic blasts and leukemic stem cells (LSCs), and absence on healthy tissues, normal hematopoietic stem and progenitor cells (HSPCs). In contrast to other blood cancer types, where CAR-T therapies are being similarly studied, only a rather small number of AML patients has received CAR-T-cell treatment in clinical trials, resulting in limited clinical experience for this therapeutic approach in AML. For curative AML treatment, abrogation of bulk blasts and LSCs is mandatory with the need for hematopoietic recovery after CAR-T administration. Herein, we provide a critical review of the current pipeline of candidate target antigens and corresponding CAR-T-cell products in AML, assess challenges for clinical translation and implementation in routine clinical practice, as well as perspectives for overcoming them.
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El Khawanky N, Hughes A, Yu W, Myburgh R, Matschulla T, Taromi S, Aumann K, Clarson J, Vinnakota JM, Shoumariyeh K, Miething C, Lopez AF, Brown MP, Duyster J, Hein L, Manz MG, Hughes TP, White DL, Yong ASM, Zeiser R. Demethylating therapy increases anti-CD123 CAR T cell cytotoxicity against acute myeloid leukemia. Nat Commun 2021; 12:6436. [PMID: 34750374 PMCID: PMC8575966 DOI: 10.1038/s41467-021-26683-0] [Citation(s) in RCA: 45] [Impact Index Per Article: 15.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/27/2020] [Accepted: 10/19/2021] [Indexed: 12/18/2022] Open
Abstract
Successful treatment of acute myeloid leukemia (AML) with chimeric antigen receptor (CAR) T cells is hampered by toxicity on normal hematopoietic progenitor cells and low CAR T cell persistence. Here, we develop third-generation anti-CD123 CAR T cells with a humanized CSL362-based ScFv and a CD28-OX40-CD3ζ intracellular signaling domain. This CAR demonstrates anti-AML activity without affecting the healthy hematopoietic system, or causing epithelial tissue damage in a xenograft model. CD123 expression on leukemia cells increases upon 5'-Azacitidine (AZA) treatment. AZA treatment of leukemia-bearing mice causes an increase in CTLA-4negative anti-CD123 CAR T cell numbers following infusion. Functionally, the CTLA-4negative anti-CD123 CAR T cells exhibit superior cytotoxicity against AML cells, accompanied by higher TNFα production and enhanced downstream phosphorylation of key T cell activation molecules. Our findings indicate that AZA increases the immunogenicity of AML cells, enhancing recognition and elimination of malignant cells by highly efficient CTLA-4negative anti-CD123 CAR T cells.
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MESH Headings
- Acute Disease
- Animals
- Azacitidine/administration & dosage
- Cell Line, Tumor
- Cells, Cultured
- Cytotoxicity, Immunologic
- DNA Methylation/drug effects
- Enzyme Inhibitors/administration & dosage
- HEK293 Cells
- HL-60 Cells
- Humans
- Immunotherapy, Adoptive/methods
- Interleukin-3 Receptor alpha Subunit/immunology
- Interleukin-3 Receptor alpha Subunit/metabolism
- Kaplan-Meier Estimate
- Leukemia, Myeloid/immunology
- Leukemia, Myeloid/pathology
- Leukemia, Myeloid/therapy
- Mice, Knockout
- Receptors, Antigen, T-Cell/immunology
- Receptors, Antigen, T-Cell/metabolism
- Receptors, Chimeric Antigen/immunology
- Receptors, Chimeric Antigen/metabolism
- Single-Chain Antibodies/immunology
- Xenograft Model Antitumor Assays/methods
- Mice
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Affiliation(s)
- Nadia El Khawanky
- Precision Medicine Theme, South Australian Health and Medical Research Institute (SAHMRI), Adelaide, SA, Australia
- School of Medicine, Faculty of Health and Medical Sciences, University of Adelaide, Adelaide, SA, Australia
- Department of Medicine I, Medical Center - University of Freiburg, Faculty of Medicine, University of Freiburg, Freiburg, Germany
- Faculty of Biology, University of Freiburg, Freiburg, Germany
| | - Amy Hughes
- School of Medicine, Faculty of Health and Medical Sciences, University of Adelaide, Adelaide, SA, Australia
| | - Wenbo Yu
- Centre for Cancer Biology, SA Pathology and University of South Australia, Adelaide, SA, Australia
| | - Renier Myburgh
- Department of Medical Oncology and Hematology, University Hospital Zurich and University of Zurich, Comprehensive Cancer Center Zurich (CCCZ), Zurich, Switzerland
| | - Tony Matschulla
- Institute of Experimental and Clinical Pharmacology and Toxicology, Division II, Faculty of Medicine, University of Freiburg, Freiburg, Germany
| | - Sanaz Taromi
- Department of Medicine I, Medical Center - University of Freiburg, Faculty of Medicine, University of Freiburg, Freiburg, Germany
- Faculty of Medical and Life Sciences, University Furtwangen, Villingen-Schwenningen, Germany
| | - Konrad Aumann
- Department of Pathology, Institute for Clinical Pathology, University Medical Center Freiburg, Freiburg, Germany
| | - Jade Clarson
- Precision Medicine Theme, South Australian Health and Medical Research Institute (SAHMRI), Adelaide, SA, Australia
- Department of Haematology, Royal Adelaide Hospital, Adelaide, SA, Australia
| | - Janaki Manoja Vinnakota
- Department of Medicine I, Medical Center - University of Freiburg, Faculty of Medicine, University of Freiburg, Freiburg, Germany
| | - Khalid Shoumariyeh
- Department of Medicine I, Medical Center - University of Freiburg, Faculty of Medicine, University of Freiburg, Freiburg, Germany
| | - Cornelius Miething
- Department of Medicine I, Medical Center - University of Freiburg, Faculty of Medicine, University of Freiburg, Freiburg, Germany
| | - Angel F Lopez
- School of Medicine, Faculty of Health and Medical Sciences, University of Adelaide, Adelaide, SA, Australia
- Centre for Cancer Biology, SA Pathology and University of South Australia, Adelaide, SA, Australia
| | - Michael P Brown
- School of Medicine, Faculty of Health and Medical Sciences, University of Adelaide, Adelaide, SA, Australia
- Centre for Cancer Biology, SA Pathology and University of South Australia, Adelaide, SA, Australia
- Cancer Clinical Trials Unit, Department of Medical Oncology, Royal Adelaide Hospital, Adelaide, SA, Australia
| | - Justus Duyster
- Department of Medicine I, Medical Center - University of Freiburg, Faculty of Medicine, University of Freiburg, Freiburg, Germany
| | - Lutz Hein
- Institute of Experimental and Clinical Pharmacology and Toxicology, Division II, Faculty of Medicine, University of Freiburg, Freiburg, Germany
| | - Markus G Manz
- Department of Medical Oncology and Hematology, University Hospital Zurich and University of Zurich, Comprehensive Cancer Center Zurich (CCCZ), Zurich, Switzerland
| | - Timothy P Hughes
- Precision Medicine Theme, South Australian Health and Medical Research Institute (SAHMRI), Adelaide, SA, Australia
- School of Medicine, Faculty of Health and Medical Sciences, University of Adelaide, Adelaide, SA, Australia
- Department of Haematology, Royal Adelaide Hospital, Adelaide, SA, Australia
| | - Deborah L White
- Precision Medicine Theme, South Australian Health and Medical Research Institute (SAHMRI), Adelaide, SA, Australia
- School of Medicine, Faculty of Health and Medical Sciences, University of Adelaide, Adelaide, SA, Australia
- School of Biological Sciences, Faculty of Science, University of Adelaide, Adelaide, SA, Australia
| | - Agnes S M Yong
- Precision Medicine Theme, South Australian Health and Medical Research Institute (SAHMRI), Adelaide, SA, Australia.
- School of Medicine, Faculty of Health and Medical Sciences, University of Adelaide, Adelaide, SA, Australia.
- Department of Haematology, Royal Perth Hospital, Perth, WA, Australia.
- School of Medicine, The University of Western Australia, Perth, WA, Australia.
| | - Robert Zeiser
- Department of Medicine I, Medical Center - University of Freiburg, Faculty of Medicine, University of Freiburg, Freiburg, Germany.
- Signaling Research Centres BIOSS and CIBSS-Centre for Integrative Biological Signalling Studies, University of Freiburg, Freiburg, Germany.
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