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Niu X, Wang C, Jiang H, Gao R, Lu Y, Guo X, Zhou H, Cui X, Sun J, Qiu Q, Sun D, Lu H. A pan-allelic human SIRPα-blocking antibody, ES004-B5, promotes tumor killing by enhancing macrophage phagocytosis and subsequently inducing an effective T-cell response. Antib Ther 2024; 7:266-280. [PMID: 39257438 PMCID: PMC11384143 DOI: 10.1093/abt/tbae022] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2024] [Revised: 07/14/2024] [Accepted: 08/27/2024] [Indexed: 09/12/2024] Open
Abstract
As a major immune cell type in the tumor microenvironment, tumor-associated macrophages secrete suppressive factors that can inhibit antitumor immunity and promote tumor progression. One approach trying to utilize macrophages for immunotherapy has been to block the CD47-SIRPα axis, which mediates inhibitory signaling, to promote phagocytosis of tumor cells. Many CD47-targeted agents, namely, anti-CD47 antibodies and SIRPα fusion proteins, were associated with a diverse spectrum of toxicities that limit their use in clinical settings. Universal expression of CD47 also leads to a severe "antigen sink" effect of CD47-targeted agents. Given that the CD47 receptor, SIRPα, has a more restricted expression profile and may have CD47-independent functions, targeting SIRPα is considered to have distinct advantages in improving clinical efficacy with a better safety profile. We have developed ES004-B5, a potentially best-in-class pan-allelic human SIRPα-blocking antibody using hybridoma technology. ES004-B5 binds to major human SIRPα variants through a unique epitope with high affinity. By blocking CD47-induced inhibitory "don't-eat-me" signaling, ES004-B5 exerts superior antitumor activity in combination with anti-tumor-associated antigen antibodies in vitro and in vivo. Unlike CD47-targeted agents, ES004-B5 exhibits an excellent safety profile in nonhuman primates. ES004-B5 has potential to be an important backbone for SIRPα-based combination therapy and/or bispecific antibodies, which will likely overcome the limitations of CD47-targeted agents encountered in clinical settings.
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Affiliation(s)
- Xiaofeng Niu
- Elpiscience Biopharma, BLDG. 3, 998 Halei RD, Pudong, Shanghai 201203, P.R. China
| | - Chunnian Wang
- Elpiscience Biopharma, BLDG. 3, 998 Halei RD, Pudong, Shanghai 201203, P.R. China
| | - Haixia Jiang
- Elpiscience Biopharma, BLDG. 3, 998 Halei RD, Pudong, Shanghai 201203, P.R. China
| | - Rui Gao
- Elpiscience Biopharma, BLDG. 3, 998 Halei RD, Pudong, Shanghai 201203, P.R. China
| | - Yefeng Lu
- Elpiscience Biopharma, BLDG. 3, 998 Halei RD, Pudong, Shanghai 201203, P.R. China
| | - Xiaoli Guo
- Elpiscience Biopharma, BLDG. 3, 998 Halei RD, Pudong, Shanghai 201203, P.R. China
| | - Hongping Zhou
- Elpiscience Biopharma, BLDG. 3, 998 Halei RD, Pudong, Shanghai 201203, P.R. China
| | - Xue Cui
- Elpiscience Biopharma, BLDG. 3, 998 Halei RD, Pudong, Shanghai 201203, P.R. China
| | - Jun Sun
- Elpiscience Biopharma, BLDG. 3, 998 Halei RD, Pudong, Shanghai 201203, P.R. China
| | - Quan Qiu
- Elpiscience Biopharma, BLDG. 3, 998 Halei RD, Pudong, Shanghai 201203, P.R. China
| | - Dawei Sun
- Elpiscience Biopharma, BLDG. 3, 998 Halei RD, Pudong, Shanghai 201203, P.R. China
| | - Hongtao Lu
- Elpiscience Biopharma, BLDG. 3, 998 Halei RD, Pudong, Shanghai 201203, P.R. China
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Yin N, Li X, Zhang X, Xue S, Cao Y, Niedermann G, Lu Y, Xue J. Development of pharmacological immunoregulatory anti-cancer therapeutics: current mechanistic studies and clinical opportunities. Signal Transduct Target Ther 2024; 9:126. [PMID: 38773064 PMCID: PMC11109181 DOI: 10.1038/s41392-024-01826-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/11/2023] [Revised: 03/25/2024] [Accepted: 03/28/2024] [Indexed: 05/23/2024] Open
Abstract
Immunotherapy represented by anti-PD-(L)1 and anti-CTLA-4 inhibitors has revolutionized cancer treatment, but challenges related to resistance and toxicity still remain. Due to the advancement of immuno-oncology, an increasing number of novel immunoregulatory targets and mechanisms are being revealed, with relevant therapies promising to improve clinical immunotherapy in the foreseeable future. Therefore, comprehending the larger picture is important. In this review, we analyze and summarize the current landscape of preclinical and translational mechanistic research, drug development, and clinical trials that brought about next-generation pharmacological immunoregulatory anti-cancer agents and drug candidates beyond classical immune checkpoint inhibitors. Along with further clarification of cancer immunobiology and advances in antibody engineering, agents targeting additional inhibitory immune checkpoints, including LAG-3, TIM-3, TIGIT, CD47, and B7 family members are becoming an important part of cancer immunotherapy research and discovery, as are structurally and functionally optimized novel anti-PD-(L)1 and anti-CTLA-4 agents and agonists of co-stimulatory molecules of T cells. Exemplified by bispecific T cell engagers, newly emerging bi-specific and multi-specific antibodies targeting immunoregulatory molecules can provide considerable clinical benefits. Next-generation agents also include immune epigenetic drugs and cytokine-based therapeutics. Cell therapies, cancer vaccines, and oncolytic viruses are not covered in this review. This comprehensive review might aid in further development and the fastest possible clinical adoption of effective immuno-oncology modalities for the benefit of patients.
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Affiliation(s)
- Nanhao Yin
- Division of Thoracic Tumor Multimodality Treatment, Cancer Center & State Key Laboratory of Biotherapy, and The National Clinical Research Center for Geriatrics, West China Hospital, Sichuan University, No. 37, Guoxue Lane, Chengdu, 610041, Sichuan, PR China
| | - Xintong Li
- Division of Thoracic Tumor Multimodality Treatment, Cancer Center & State Key Laboratory of Biotherapy, and The National Clinical Research Center for Geriatrics, West China Hospital, Sichuan University, No. 37, Guoxue Lane, Chengdu, 610041, Sichuan, PR China
| | - Xuanwei Zhang
- Division of Thoracic Tumor Multimodality Treatment, Cancer Center & State Key Laboratory of Biotherapy, and The National Clinical Research Center for Geriatrics, West China Hospital, Sichuan University, No. 37, Guoxue Lane, Chengdu, 610041, Sichuan, PR China
| | - Shaolong Xue
- Department of Gynecology and Obstetrics, West China Second University Hospital, Sichuan University, No. 20, Section 3, South Renmin Road, Chengdu, 610041, Sichuan, PR China
| | - Yu Cao
- Department of Emergency Medicine, Laboratory of Emergency Medicine, West China Hospital, Sichuan University, No. 37, Guoxue Lane, Chengdu, 610041, Sichuan, PR China
- Institute of Disaster Medicine & Institute of Emergency Medicine, Sichuan University, No. 17, Gaopeng Avenue, Chengdu, 610041, Sichuan, PR China
| | - Gabriele Niedermann
- Department of Radiation Oncology, Medical Center-University of Freiburg, Faculty of Medicine, University of Freiburg, German Cancer Consortium (DKTK) Partner Site DKTK-Freiburg, Robert-Koch-Strasse 3, 79106, Freiburg, Germany.
| | - You Lu
- Division of Thoracic Tumor Multimodality Treatment, Cancer Center & State Key Laboratory of Biotherapy, and The National Clinical Research Center for Geriatrics, West China Hospital, Sichuan University, No. 37, Guoxue Lane, Chengdu, 610041, Sichuan, PR China.
- Laboratory of Clinical Cell Therapy, West China Hospital, Sichuan University, No. 2222, Xinchuan Road, Chengdu, 610041, Sichuan, PR China.
| | - Jianxin Xue
- Division of Thoracic Tumor Multimodality Treatment, Cancer Center & State Key Laboratory of Biotherapy, and The National Clinical Research Center for Geriatrics, West China Hospital, Sichuan University, No. 37, Guoxue Lane, Chengdu, 610041, Sichuan, PR China.
- Laboratory of Clinical Cell Therapy, West China Hospital, Sichuan University, No. 2222, Xinchuan Road, Chengdu, 610041, Sichuan, PR China.
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Zhang W, Liu M, Li W, Song Y. Immune cells in the B-cell lymphoma microenvironment: From basic research to clinical applications. Chin Med J (Engl) 2024; 137:776-790. [PMID: 38269619 PMCID: PMC10997228 DOI: 10.1097/cm9.0000000000002919] [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: 08/29/2023] [Indexed: 01/26/2024] Open
Abstract
ABSTRACT B-cell lymphoma is a group of hematological malignancies characterized by variable genetic and biological features and clinical behaviors. The tumor microenvironment (TME) is a complex network in tumors, which consists of surrounding blood vessels, extracellular matrix, immune and non-immune cells, and signaling molecules. Increasing evidence has shown that the TME, especially immune cells within, is a double-edged sword, acting either as a tumor killer or as a promoter of tumor progression. These pro-tumor activities are driven by subpopulations of immune cells that express typical markers but have unique transcriptional characteristics, making tumor-associated immune cells good targets for human anti-cancer therapy by ablating immunosuppressive cells or enhancing immune-activated cells. Thus, exploring the role of immune cells in the TME provides distinct insights for immunotherapy in B-cell lymphoma. In this review, we elucidated the interaction between immune cells and tumor cells and their function in the initiation, progression, and prognosis of B-cell lymphoma, from preclinical experiments to clinical trials. Furthermore, we outlined potential therapeutic approaches and discussed the potential clinical value and future perspectives of targeting immune cells in patients with B-cell lymphoma.
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Affiliation(s)
- Wenli Zhang
- Department of Hematology, The First Affiliated Hospital of Zhengzhou University, Zhengzhou, Henan 450052, China
- Department of Hematology, Henan Provincial Hematology Hospital, Zhengzhou, Henan 450000, China
- Academy of Medical Sciences, Zhengzhou University, Zhengzhou, Henan 450052, China
| | - Mengmeng Liu
- Academy of Medical Sciences, Zhengzhou University, Zhengzhou, Henan 450052, China
- Department of Research and Foreign Affairs, The Affiliated Cancer Hospital of Zhengzhou University and Henan Cancer Hospital, Zhengzhou, Henan 450008, China
| | - Wei Li
- Department of Hematology, The First Affiliated Hospital of Zhengzhou University, Zhengzhou, Henan 450052, China
- Department of Hematology, Henan Provincial Hematology Hospital, Zhengzhou, Henan 450000, China
| | - Yongping Song
- Department of Hematology, The First Affiliated Hospital of Zhengzhou University, Zhengzhou, Henan 450052, China
- Department of Hematology, Henan Provincial Hematology Hospital, Zhengzhou, Henan 450000, China
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Luo X, Shen Y, Huang W, Bao Y, Mo J, Yao L, Yuan L. Blocking CD47-SIRPα Signal Axis as Promising Immunotherapy in Ovarian Cancer. Cancer Control 2023; 30:10732748231159706. [PMID: 36826231 PMCID: PMC9969460 DOI: 10.1177/10732748231159706] [Citation(s) in RCA: 8] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/25/2023] Open
Abstract
Among the three primary gynecological malignancies, ovarian cancer has the lowest incidence but the worst prognosis. Because of the poor prognosis of ovarian cancer patients treated with existing treatments, immunotherapy is emerging as a potentially ideal alternative to surgery, chemotherapy, and targeted therapy. Among immunotherapies, immune checkpoint inhibitors have been the most thoroughly studied, and many drugs have been successfully used in the clinic. CD47, a novel immune checkpoint, provides insights into ovarian cancer immunotherapy. This review highlights the mechanisms of tumor immune evasion via CD47-mediated inhibition of phagocytosis and provides a comprehensive insight into the progress of the relevant targeted agents in ovarian cancer.
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Affiliation(s)
- Xukai Luo
- Department of Gynecologic Oncology, Obstetrics and Gynecology Hospital of
Fudan University, Shanghai, China
| | - Yini Shen
- Department of Gynecologic Oncology, Obstetrics and Gynecology Hospital of
Fudan University, Shanghai, China
| | - Wu Huang
- Department of Gynecologic Oncology, Obstetrics and Gynecology Hospital of
Fudan University, Shanghai, China
| | - Yiting Bao
- Department of Gynecologic Oncology, Obstetrics and Gynecology Hospital of
Fudan University, Shanghai, China
| | - Jiahang Mo
- Department of Gynecologic Oncology, Obstetrics and Gynecology Hospital of
Fudan University, Shanghai, China
| | - Liangqing Yao
- Department of Gynecologic Oncology, Obstetrics and Gynecology Hospital of
Fudan University, Shanghai, China
| | - Lei Yuan
- Department of Gynecologic Oncology, Obstetrics and Gynecology Hospital of
Fudan University, Shanghai, China,Lei Yuan, MD, Obstetrics and Gynecology
Hospital, Fudan University, 419 Fangxie Road, Huangpu District, Shanghai 200011,
China.
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Yang J, Deresa I, Ho WH, Long H, Maslyar D, Rosenthal A, Liang SC, Pincetic A. AL008 Enhances Myeloid Antitumor Function by Inhibiting SIRPα Signaling and Activating Fc Receptors. JOURNAL OF IMMUNOLOGY (BALTIMORE, MD. : 1950) 2023; 210:204-215. [PMID: 36480261 PMCID: PMC9772397 DOI: 10.4049/jimmunol.2200157] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/23/2022] [Accepted: 11/02/2022] [Indexed: 01/03/2023]
Abstract
Antagonizing the CD47-signal regulatory protein (SIRP)α pathway, a critical myeloid checkpoint, promotes antitumor immunity. In this study, we describe the development of AL008, a pan-allelic, SIRPα-specific Ab that triggers the degradation of SIRPα and, concurrently, stimulates FcγR activation of myeloid cells through an engineered Fc domain. AL008 showed superior enhancement of phagocytosis of tumor cells opsonized with antitumor Ag Abs compared with another SIRPα Ab tested. Unlike ligand-blocking SIRPα Abs, AL008 demonstrated single-agent activity by increasing tumor cell engulfment by human monocyte-derived macrophages even in the absence of opsonizing agents. This effect was due to enhanced Fc function, as blocking FcγR2A abrogated AL008-mediated phagocytic activity. AL008 also promoted human monocyte-derived dendritic cell-mediated T cell proliferation. In humanized mouse models, AL008 induced internalization of SIRPα and increased expression of CD86 and HLA-DR on human tumor-associated macrophages, confirming that the mechanism of action is retained in vivo. Monotherapy treatment with AL008 significantly reduced tumor growth in humanized mice implanted with human MDA-MB-231 tumor cells. AL008 also significantly potentiated the effects of T cell checkpoint blockade with anti-programmed death ligand-1 in syngeneic tumor models. This dual and specific mechanism of AL008, to our knowledge, provides a novel therapeutic strategy for targeting myeloid cells for immune activation.
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Affiliation(s)
| | | | | | - Hua Long
- Alector, Inc., South San Francisco, CA
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Vanmeerbeek I, Govaerts J, Laureano RS, Sprooten J, Naulaerts S, Borras DM, Laoui D, Mazzone M, Van Ginderachter JA, Garg AD. The Interface of Tumour-Associated Macrophages with Dying Cancer Cells in Immuno-Oncology. Cells 2022; 11:3890. [PMID: 36497148 PMCID: PMC9741298 DOI: 10.3390/cells11233890] [Citation(s) in RCA: 12] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/29/2022] [Revised: 11/25/2022] [Accepted: 11/28/2022] [Indexed: 12/03/2022] Open
Abstract
Tumour-associated macrophages (TAMs) are essential players in the tumour microenvironment (TME) and modulate various pro-tumorigenic functions such as immunosuppression, angiogenesis, cancer cell proliferation, invasion and metastasis, along with resistance to anti-cancer therapies. TAMs also mediate important anti-tumour functions and can clear dying cancer cells via efferocytosis. Thus, not surprisingly, TAMs exhibit heterogeneous activities and functional plasticity depending on the type and context of cancer cell death that they are faced with. This ultimately governs both the pro-tumorigenic and anti-tumorigenic activity of TAMs, making the interface between TAMs and dying cancer cells very important for modulating cancer growth and the efficacy of chemo-radiotherapy or immunotherapy. In this review, we discuss the interface of TAMs with cancer cell death from the perspectives of cell death pathways, TME-driven variations, TAM heterogeneity and cell-death-inducing anti-cancer therapies. We believe that a better understanding of how dying cancer cells influence TAMs can lead to improved combinatorial anti-cancer therapies, especially in combination with TAM-targeting immunotherapies.
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Affiliation(s)
- Isaure Vanmeerbeek
- Cell Stress & Immunity (CSI) Lab, Department of Cellular and Molecular Medicine, KU Leuven, 3000 Leuven, Belgium
| | - Jannes Govaerts
- Cell Stress & Immunity (CSI) Lab, Department of Cellular and Molecular Medicine, KU Leuven, 3000 Leuven, Belgium
| | - Raquel S. Laureano
- Cell Stress & Immunity (CSI) Lab, Department of Cellular and Molecular Medicine, KU Leuven, 3000 Leuven, Belgium
| | - Jenny Sprooten
- Cell Stress & Immunity (CSI) Lab, Department of Cellular and Molecular Medicine, KU Leuven, 3000 Leuven, Belgium
| | - Stefan Naulaerts
- Cell Stress & Immunity (CSI) Lab, Department of Cellular and Molecular Medicine, KU Leuven, 3000 Leuven, Belgium
| | - Daniel M. Borras
- Cell Stress & Immunity (CSI) Lab, Department of Cellular and Molecular Medicine, KU Leuven, 3000 Leuven, Belgium
| | - Damya Laoui
- Laboratory of Dendritic Cell Biology and Cancer Immunotherapy, VIB Center for Inflammation Research, 1050 Brussels, Belgium
- Laboratory of Cellular and Molecular Immunology, Vrije Universiteit Brussel, 1050 Brussels, Belgium
| | - Massimiliano Mazzone
- Laboratory of Tumour Inflammation and Angiogenesis, VIB Center for Cancer Biology, 3000 Leuven, Belgium
- Laboratory of Tumour Inflammation and Angiogenesis, Department of Oncology, KU Leuven, 3000 Leuven, Belgium
| | - Jo A. Van Ginderachter
- Laboratory of Cellular and Molecular Immunology, Vrije Universiteit Brussel, 1050 Brussels, Belgium
- Laboratory of Myeloid Cell Immunology, VIB Center for Inflammation Research, 1050 Brussels, Belgium
| | - Abhishek D. Garg
- Cell Stress & Immunity (CSI) Lab, Department of Cellular and Molecular Medicine, KU Leuven, 3000 Leuven, Belgium
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Son J, Hsieh RCE, Lin HY, Krause KJ, Yuan Y, Biter AB, Welsh J, Curran MA, Hong DS. Inhibition of the CD47-SIRPα axis for cancer therapy: A systematic review and meta-analysis of emerging clinical data. Front Immunol 2022; 13:1027235. [PMID: 36439116 PMCID: PMC9691650 DOI: 10.3389/fimmu.2022.1027235] [Citation(s) in RCA: 18] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2022] [Accepted: 09/30/2022] [Indexed: 08/11/2023] Open
Abstract
CD47-SIRPα interaction acts as a "don't eat me" signal and is exploited by cancer to downregulate innate and adaptive immune surveillance. There has been intense interest to develop a mechanism of blockade, and we aimed to analyze the emerging data from early clinical trials. We performed a systematic review and meta-analysis of relevant databases and conference abstracts including clinical trials using CD47 and/or SIRPα inhibitors in cancer treatment. Nonlinear mixed models were applied for comparison of response and toxicity. We retrieved 317 articles, 24 of which were eligible. These included 771 response-evaluable patients with hematologic (47.1%) and solid tumors (52.9%). Of these, 6.4% experienced complete response, 10.4% partial response, and 26.1% stable disease for a 16.7% objective response rate (ORR), 42.8% disease control rate, and 4.8-month median duration of response. ORR was significantly higher for hematologic cancers (25.3%) than solid cancers (9.1%, p=0.042). Comparing by mechanism, seven CD47 monoclonal antibodies (mAbs) and six selective SIRPα blockers were given alone or combined with checkpoint inhibitors, targeted therapy, and/or chemotherapy. In solid cancers, selective SIRPα blockade showed a higher ORR (16.2%) than anti-CD47 mAbs (2.8%, p=0.079), which was significant for combination therapies (ORR 28.3% vs 3.0%, respectively, p=0.010). Responses were seen in head and neck, colorectal, endometrial, ovarian, hepatocellular, non-small cell lung, and HER2+gastroesophageal cancers. Dose-limiting toxicity (DLT) was seen in 3.3% of patients (5.4% anti-CD47 mAbs, 1.4% selective SIRPα blockers; p=0.01). The frequency of treatment-related adverse events (TRAEs) ≥grade 3 was 18.0%, similar between the two groups (p=0.082), and mostly laboratory abnormalities. For anti-CD47 mAbs, the most common toxicities included grade 1-2 fatigue (27.2%), headache (21.0%), and anemia (20.5%). For selective SIRPα blockers, these included grade 1-2 infusion reaction (23.1%) and fatigue (15.8%). Anti-CD47 mAbs were significantly more likely than selective SIRPα blockers to cause grade 1-2 fever, chills, nausea/vomiting, headache, and anemia. In conclusion, combination therapies using selective SIRPα blockade had higher response rates in solid tumors than anti-CD47 mAb combinations. Hematologic changes were the main TRAEs, and selective SIRPα blockers seemed to have a better grade 1-2 toxicity profile. Treatment was well-tolerated with minimal DLTs.
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Affiliation(s)
- Ji Son
- Departments of Gynecologic Oncology and Reproductive Medicine, The University of Texas MD Anderson Cancer Center, Houston, TX, United States
| | - Rodney Cheng-En Hsieh
- Departments of Immunology, The University of Texas MD Anderson Cancer Center, Houston, TX, United States
- Department of Radiation Oncology, Chang Gung Memorial Hospital at Linkou and Chang Gung University, Taoyuan, Taiwan
| | - Heather Y. Lin
- Departments of Biostatistics, The University of Texas MD Anderson Cancer Center, Houston, TX, United States
| | - Kate J. Krause
- Departments of Research Medical Library, The University of Texas MD Anderson Cancer Center, Houston, TX, United States
| | - Ying Yuan
- Departments of Biostatistics, The University of Texas MD Anderson Cancer Center, Houston, TX, United States
| | - Amadeo B. Biter
- Departments of Investigational Cancer Therapeutics, The University of Texas MD Anderson Cancer Center, Houston, TX, United States
| | - James Welsh
- Departments of Radiation Oncology, The University of Texas MD Anderson Cancer Center, Houston, TX, United States
| | - Michael A. Curran
- Departments of Immunology, The University of Texas MD Anderson Cancer Center, Houston, TX, United States
| | - David S. Hong
- Departments of Investigational Cancer Therapeutics, The University of Texas MD Anderson Cancer Center, Houston, TX, United States
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Targeting CXCR4 and CD47 Receptors: An Overview of New and Old Molecules for a Biological Personalized Anticancer Therapy. Int J Mol Sci 2022; 23:ijms232012499. [PMID: 36293358 PMCID: PMC9604048 DOI: 10.3390/ijms232012499] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/02/2022] [Revised: 10/14/2022] [Accepted: 10/14/2022] [Indexed: 11/26/2022] Open
Abstract
Biological therapy, with its multifaceted applications, has revolutionized the treatment of tumors, mainly due to its ability to exclusively target cancer cells and reduce the adverse effects on normal tissues. This review focuses on the therapies targeting the CXCR4 and CD47 receptors. We surveyed the results of early clinical trials testing compounds classified as nonpeptides, small peptides, CXCR4 antagonists or specific antibodies whose activity reduces or completely blocks the intracellular signaling pathways and cell proliferation. We then examined antibodies and fusion proteins against CD47, the receptor that acts as a “do not eat me” signal to phagocytes escaping immune surveillance. Despite these molecules being tested in early clinical trials, some drawbacks are emerging that impair their use in practice. Finally, we examined the ImmunoGenic Surrender mechanism that involves crosstalk and co-internalization of CXCR4 and CD47 upon engagement of CXCR4 by ligands or other molecules. The favorable effect of such compounds is dual as CD47 surface reduction impact on the immune response adds to the block of CXCR4 proliferative potential. These results suggest that a combination of different therapeutic approaches has more beneficial effects on patients’ survival and may pave the way for new accomplishments in personalized anticancer therapy.
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Bouwstra R, van Meerten T, Bremer E. CD47‐SIRPα blocking‐based immunotherapy: Current and prospective therapeutic strategies. Clin Transl Med 2022; 12:e943. [PMID: 35908284 PMCID: PMC9339239 DOI: 10.1002/ctm2.943] [Citation(s) in RCA: 29] [Impact Index Per Article: 14.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2022] [Revised: 05/31/2022] [Accepted: 06/07/2022] [Indexed: 01/22/2023] Open
Abstract
Background The CD47‐signal regulatory protein alpha (SIRPα) ‘don't eat me’ signalling axis is perhaps the most prominent innate immune checkpoint to date. However, from initial clinical trials, it is evident that monotherapy with CD47‐SIRPα blocking has a limited therapeutic effect at the maximum tolerated dose. Furthermore, treatment is associated with severe side effects, most notably anaemia, that are attributable to the ubiquitous expression of CD47. Nevertheless, promising clinical responses have been reported upon combination with the tumour‐targeting antibody rituximab or azacytidine, although toxicity issues still hamper clinical application. Main body Here, we discuss the current state of CD47‐SIRPα blocking therapy with a focus on limitations of current strategies, such as depletion of red blood cells. Subsequently, we focus on innovations designed to overcome these limitations. These include novel antibody formats designed to selectively target CD47 on tumour cells as well as tumour‐targeted bispecific antibodies with improved selectivity. In addition, the rationale and outcome of combinatorial approaches to improve the therapeutic effect of CD47 blockade are discussed. Such combinations include those with tumour‐targeted opsonizing antibodies, systemic therapy, epigenetic drugs, other immunomodulatory T‐cell‐targeted therapeutics or dual immunomodulatory CD47 bispecific antibodies. Conclusion With these advances in the design of CD47‐SIRPα‐targeting therapeutic strategies and increasing insight into the mechanism of action of this innate checkpoint, including the role of adaptive immunity, further advances in the clinical application of this checkpoint can be anticipated.
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Affiliation(s)
- Renée Bouwstra
- Department of Hematology University Medical Center Groningen University of Groningen Groningen The Netherlands
| | - Tom van Meerten
- Department of Hematology University Medical Center Groningen University of Groningen Groningen The Netherlands
| | - Edwin Bremer
- Department of Hematology University Medical Center Groningen University of Groningen Groningen The Netherlands
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10
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Behrens LM, van den Berg TK, van Egmond M. Targeting the CD47-SIRPα Innate Immune Checkpoint to Potentiate Antibody Therapy in Cancer by Neutrophils. Cancers (Basel) 2022; 14:cancers14143366. [PMID: 35884427 PMCID: PMC9319280 DOI: 10.3390/cancers14143366] [Citation(s) in RCA: 13] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2022] [Revised: 07/06/2022] [Accepted: 07/07/2022] [Indexed: 12/19/2022] Open
Abstract
Simple Summary Immunotherapy aims to engage various immune cells in the elimination of cancer cells. Neutrophils are the most abundant leukocytes in the circulation and have unique mechanisms by which they can kill cancer cells opsonized by antibodies. However, neutrophil effector functions are limited by the inhibitory receptor SIRPα, when it interacts with CD47. The CD47 protein is expressed on all cells in the body and acts as a ‘don’t eat me’ signal to prevent tissue damage. Cancer cells can express high levels of CD47 to circumvent tumor elimination. Thus, blocking the interaction between CD47 and SIRPα may enhance anti-tumor effects by neutrophils in the presence of tumor-targeting monoclonal antibodies. In this review, we discuss CD47-SIRPα as an innate immune checkpoint on neutrophils and explore the preliminary results of clinical trials using CD47-SIRPα blocking agents. Abstract In the past 25 years, a considerable number of therapeutic monoclonal antibodies (mAb) against a variety of tumor-associated antigens (TAA) have become available for the targeted treatment of hematologic and solid cancers. Such antibodies opsonize cancer cells and can trigger cytotoxic responses mediated by Fc-receptor expressing immune cells in the tumor microenvironment (TME). Although frequently ignored, neutrophils, which are abundantly present in the circulation and many cancers, have demonstrated to constitute bona fide effector cells for antibody-mediated tumor elimination in vivo. It has now also been established that neutrophils exert a unique mechanism of cytotoxicity towards antibody-opsonized tumor cells, known as trogoptosis, which involves Fc-receptor (FcR)-mediated trogocytosis of cancer cell plasma membrane leading to a lytic/necrotic type of cell death. However, neutrophils prominently express the myeloid inhibitory receptor SIRPα, which upon interaction with the ‘don’t eat me’ signal CD47 on cancer cells, limits cytotoxicity, forming a mechanism of resistance towards anti-cancer antibody therapeutics. In fact, tumor cells often overexpress CD47, thereby even more strongly restricting neutrophil-mediated tumor killing. Blocking the CD47-SIRPα interaction may therefore potentiate neutrophil-mediated antibody-dependent cellular cytotoxicity (ADCC) towards cancer cells, and various inhibitors of the CD47-SIRPα axis are now in clinical studies. Here, we review the role of neutrophils in antibody therapy in cancer and their regulation by the CD47-SIRPα innate immune checkpoint. Moreover, initial results of CD47-SIRPα blockade in clinical trials are discussed.
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Affiliation(s)
- Leonie M. Behrens
- Department of Molecular Cell Biology and Immunology, Amsterdam UMC, Vrije Universiteit Amsterdam, 1081 HV Amsterdam, The Netherlands; (T.K.v.d.B.); (M.v.E.)
- Cancer Center Amsterdam, Cancer Biology and Immunology Program, 1081 HV Amsterdam, The Netherlands
- Amsterdam Institute for Infection and Immunity, Cancer Immunology Program, 1081 HV Amsterdam, The Netherlands
- Correspondence:
| | - Timo K. van den Berg
- Department of Molecular Cell Biology and Immunology, Amsterdam UMC, Vrije Universiteit Amsterdam, 1081 HV Amsterdam, The Netherlands; (T.K.v.d.B.); (M.v.E.)
- Byondis B.V., 6545 CM Nijmegen, The Netherlands
| | - Marjolein van Egmond
- Department of Molecular Cell Biology and Immunology, Amsterdam UMC, Vrije Universiteit Amsterdam, 1081 HV Amsterdam, The Netherlands; (T.K.v.d.B.); (M.v.E.)
- Cancer Center Amsterdam, Cancer Biology and Immunology Program, 1081 HV Amsterdam, The Netherlands
- Amsterdam Institute for Infection and Immunity, Cancer Immunology Program, 1081 HV Amsterdam, The Netherlands
- Department of Surgery, Amsterdam UMC, Vrije Universiteit Amsterdam, 1081 HV Amsterdam, The Netherlands
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11
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Ohmine K, Uchibori R. Novel immunotherapies in multiple myeloma. Int J Hematol 2022; 115:799-810. [PMID: 35583724 DOI: 10.1007/s12185-022-03365-1] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2022] [Revised: 04/18/2022] [Accepted: 04/19/2022] [Indexed: 11/24/2022]
Abstract
For a substantial period, options for the treatment of multiple myeloma (MM) were limited; however, the advent of novel therapies into clinical practice in the 1990s resulted in dramatic changes in the prognosis of the disease. Subsequently, new proteasome inhibitors and immunomodulators with innovations in efficacy and toxicity were introduced; yet there remains a spectrum of patients with poor outcomes with current treatment strategies. One of the causes of disease progression in MM is the loss of the ability of the dysfunctional immune environment to control virulent cell clones. In recent years, therapies to overcome the immunosuppressive tumor microenvironment and activate the host immune system have shown promise in MM, especially in relapsed and refractory disease. Clinical use of this approach has been approved for several immunotherapies, and a number of studies are currently underway in clinical trials. This review outlines three of the newest and most promising approaches being investigated to enhance the immune system against MM: (1) overcoming immunosuppression with checkpoint inhibitors, (2) boosting immunity against tumors with vaccines, and (3) enhancing immune effectors with adoptive cell therapy. Information on the latest clinical trials in each class will be provided, and further developments will be discussed.
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Affiliation(s)
- Ken Ohmine
- Division of Hematology, Department of Medicine, Jichi Medical University, 3311-1 Yakushiji, Shimotsuke, Tochigi, 329-0498, Japan.
- Division of Immuno-Gene and Cell Therapy (Takara Bio), Jichi Medical University, Shimotsuke, Tochigi, Japan.
| | - Ryosuke Uchibori
- Division of Immuno-Gene and Cell Therapy (Takara Bio), Jichi Medical University, Shimotsuke, Tochigi, Japan
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12
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Abstract
CD47 is a "don't eat me" signal to phagocytes that is overexpressed on many tumor cells as a potential mechanism for immune surveillance evasion. CD47 and its interaction with signal-regulating protein alpha (SIRPα) on phagocytes is therefore a promising cancer target. Therapeutic antibodies and fusion proteins that block CD47 or SIRPα have been developed and have shown activity in preclinical models of hematologic and solid tumors. Anemia is a common adverse event associated with anti-CD47 treatment, but mitigation strategies-including use of a low 'priming' dose-have substantially reduced this risk in clinical studies. While efficacy in single-agent clinical studies is lacking, findings from studies of CD47-SIRPα blockade in combination with agents that increase 'eat me' signals or with antitumor antibodies are promising. Magrolimab, an anti-CD47 antibody, is the furthest along in clinical development among agents in this class. Magrolimab combination therapy in phase Ib/II studies has been well tolerated with encouraging response rates in hematologic and solid malignancies. Similar combination therapy studies with other anti-CD47-SIRPα agents are beginning to report. Based on these early clinical successes, many trials have been initiated in hematologic and solid tumors testing combinations of CD47-SIRPα blockade with standard therapies. The results of these studies will help determine the role of this novel approach in clinical practice and are eagerly awaited.
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Affiliation(s)
- R. Maute
- Gilead Sciences, Inc., Foster City, USA
| | - J. Xu
- Gilead Sciences, Inc., Foster City, USA
| | - I.L. Weissman
- Institute for Stem Cell Biology and Regenerative Medicine, Stanford University School of Medicine, Stanford, USA
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13
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Hourani T, Holden JA, Li W, Lenzo JC, Hadjigol S, O’Brien-Simpson NM. Tumor Associated Macrophages: Origin, Recruitment, Phenotypic Diversity, and Targeting. Front Oncol 2021; 11:788365. [PMID: 34988021 PMCID: PMC8722774 DOI: 10.3389/fonc.2021.788365] [Citation(s) in RCA: 67] [Impact Index Per Article: 22.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/02/2021] [Accepted: 11/30/2021] [Indexed: 12/20/2022] Open
Abstract
The tumor microenvironment (TME) is known to have a strong influence on tumorigenesis, with various components being involved in tumor suppression and tumor growth. A protumorigenic TME is characterized by an increased infiltration of tumor associated macrophages (TAMs), where their presence is strongly associated with tumor progression, therapy resistance, and poor survival rates. This association between the increased TAMs and poor therapeutic outcomes are stemming an increasing interest in investigating TAMs as a potential therapeutic target in cancer treatment. Prominent mechanisms in targeting TAMs include: blocking recruitment, stimulating repolarization, and depletion methods. For enhancing targeting specificity multiple nanomaterials are currently being explored for the precise delivery of chemotherapeutic cargo, including the conjugation with TAM-targeting peptides. In this paper, we provide a focused literature review of macrophage biology in relation to their role in tumorigenesis. First, we discuss the origin, recruitment mechanisms, and phenotypic diversity of TAMs based on recent investigations in the literature. Then the paper provides a detailed review on the current methods of targeting TAMs, including the use of nanomaterials as novel cancer therapeutics.
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Affiliation(s)
| | | | | | | | | | - Neil M. O’Brien-Simpson
- Antimicrobial, Cancer Therapeutics and Vaccines (ACTV) Research Group, Melbourne Dental School, Centre for Oral Health Research, Royal Dental Hospital, The University of Melbourne, Melbourne, VIC, Australia
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14
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Lakhani NJ, Chow LQM, Gainor JF, LoRusso P, Lee KW, Chung HC, Lee J, Bang YJ, Hodi FS, Kim WS, Santana-Davila R, Fanning P, Squifflet P, Jin F, Kuo TC, Wan HI, Pons J, Randolph SS, Messersmith WA. Evorpacept alone and in combination with pembrolizumab or trastuzumab in patients with advanced solid tumours (ASPEN-01): a first-in-human, open-label, multicentre, phase 1 dose-escalation and dose-expansion study. Lancet Oncol 2021; 22:1740-1751. [PMID: 34793719 DOI: 10.1016/s1470-2045(21)00584-2] [Citation(s) in RCA: 54] [Impact Index Per Article: 18.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2021] [Revised: 09/23/2021] [Accepted: 09/24/2021] [Indexed: 11/18/2022]
Abstract
BACKGROUND Both innate and adaptive immune responses are important components of anticancer immunity. The CD47-SIRPα interaction could represent an important pathway used by tumour cells to evade immune surveillance. We aimed to evaluate the safety, pharmacokinetics, pharmacodynamics, and anticancer activity of evorpacept (also known as ALX148), a high-affinity CD47-blocking protein with an inactive IgG Fc region in patients with solid tumours. METHODS We did a first-in-human, open-label, multicentre, phase 1 dose-escalation and dose-expansion study at nine hospitals and one clinic in the USA and Korea. Eligible patients for the dose-escalation and safety lead-in phases were aged 18 years or older with histological or cytological diagnosis of advanced or metastatic solid tumours with no available standard therapy, measurable or unmeasurable disease according to the Response Evaluation Criteria in Solid Tumors version 1.1, and an Eastern Cooperative Oncology Group performance status score of 0 or 1. In the dose-escalation phase, which used a 3 + 3 design, patients received intravenous evorpacept at either 0·3, 1, 3, or 10 mg/kg once per week in 21-day cycles, or 30 mg/kg once every other week in 28-day cycles. In the safety lead-in phase, patients were given the maximum tolerable dose of evorpacept from the dose-escalation phase plus either intravenous pembrolizumab (200 mg administered once every 3 weeks) or intravenous trastuzumab (8 mg/kg loading dose followed by 6 mg/kg once every 3 weeks). In the dose-expansion phase, additional patients aged 18 years or older with second-line or later-line advanced malignancies were enrolled into three parallel cohorts: those with head and neck squamous cell carcinoma (HNSCC) and those with non-small-cell lung cancer (NSCLC) were given the maximum tolerated dose of evorpacept plus intravenous pembrolizumab (200 mg administered once every 3 weeks), and patients with HER2-positive gastric or gastroesophageal junction cancer were given the maximum tolerated dose of evorpacept plus intravenous trastuzumab (8 mg/kg loading dose followed by 6 mg/kg once every 3 weeks) until disease progression, voluntary withdrawal from the study, or unacceptable toxicity. The primary endpoint was the maximum tolerated dose of evorpacept administered as a single agent and in combination with pembrolizumab or trastuzumab, measured by the occurrence of dose-limiting toxicities during the first cycle, and was assessed in all patients who had received at least one dose of evorpacept. Secondary outcomes included the safety, tolerability, and antitumour activity of evorpacept, alone or in combination with pembrolizumab or trastuzumab. The primary outcome, safety, and tolerability were assessed in all patients who had received at least one dose of evorpacept, and antitumour activity was assessed in those who recieved at least one dose of study treatment and underwent at least one post-baseline tumor assessment. This trial is registered with ClinicalTrials.gov, NCT03013218. FINDINGS Between March 6, 2017, and Feb 21, 2019, 110 patients received single-agent evorpacept (n=28), evorpacept plus pembrolizumab (n=52), or evorpacept plus trastuzumab (n=30), and were included in the safety analysis. Median follow-up was 29·1 months (95% CI not calculable [NC]-NC) in the single-agent cohort, 27·0 months (25·1-28·8) in the evorpacept plus pembrolizumab cohort, and 32·7 months (27·0-32·7) in the evorpacept plus trastuzumab cohort. Two (7%) dose-limiting toxicities in the first cycle were reported in patients who received single-agent evorpacept; neutropenia with an associated infection in one patient with gastroesophageal junction cancer who received 3 mg/kg once per week, and thrombocytopenia with associated bleeding in one patient with pancreatic cancer who received 30 mg/kg once every other week. No maximum tolerated dose was reached; the maximum administered doses were 10 mg/kg once per week or 30 mg/kg once every other week. The 10 mg/kg once per week dose was used in the expansion cohorts in combination with pembrolizumab or trastuzumab. The most common grade 3 or worse treatment-related adverse events were thrombocytopenia with single-agent evorpacept (two [7%] patients) and evorpacept plus pembrolizumab (two [4%]), and thrombocytopenia (two [7%]) and neutropenia (two [7%]) with evorpacept plus trastuzumab. In patients who received single-agent evorpacept, four treatment-related serious adverse events were reported. Five serious treatment-related adverse events related to evorpacept plus pembrolizumab were reported, and one serious adverse event related to evorpacept plus trastuzumab was reported. In response-evaluable patients in the dose-escalation phase (n=15) receiving single-agent evorpacept once per week, four (27%) had a best overall response of stable disease (two received 0·3 mg/kg, one received 3 mg/kg, and one received 10 mg/kg); in the 11 patients who received single-agent evorpacept at the highest dose of 30 mg/kg once every other week, two (18%) had stable disease. In the dose-expansion cohort, overall responses were recorded in four (20·0%; 95% CI 5·7-43·7) of 20 patients with HNSCC who received evorpacept plus pembrolizumab, in one (5·0%; 0·1-24·9) of 20 patients with NSCLC who received evorpacept plus pembrolizumab, and in four (21·1%; 6·1-45·6) of 19 patients with gastric or gastroesophageal junction cancer who received evorpacept plus trastuzumab. INTERPRETATION The safety findings support the use of evorpacept in combination with pembrolizumab or trastuzumab for patients with advanced solid tumours. Preliminary antitumour activity results support future investigation of evorpacept combined with pembrolizumab or trastuzumab in patients with HNSCC, gastric or gastroesophageal junction cancer, and NSCLC. FUNDING ALX Oncology.
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Affiliation(s)
| | - Laura Q M Chow
- Department of Oncology, University of Washington, Seattle, WA, USA; Department of Oncology University of Texas, Austin, TX, USA
| | - Justin F Gainor
- Massachusetts General Hospital Cancer Center, Boston, MA, USA
| | | | - Keun-Wook Lee
- Seoul National University Bundang Hospital, Seoul National University College of Medicine, Seongnam, Korea
| | - Hyun Cheol Chung
- Yonsei Cancer Center, Yonsei University College of Medicine, Seoul, Korea
| | - Jeeyun Lee
- Sungkyunkwan University School of Medicine, Samsung Medical Center, Seoul, Korea
| | - Yung-Jue Bang
- Seoul National University College of Medicine, Seoul, Korea
| | | | - Won Seog Kim
- Sungkyunkwan University School of Medicine, Samsung Medical Center, Seoul, Korea
| | | | | | | | - Feng Jin
- ALX Oncology, South San Francisco, CA, USA
| | | | - Hong I Wan
- ALX Oncology, South San Francisco, CA, USA
| | - Jaume Pons
- ALX Oncology, South San Francisco, CA, USA
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15
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Sun J, Chen Y, Lubben B, Adebayo O, Muz B, Azab AK. CD47-targeting antibodies as a novel therapeutic strategy in hematologic malignancies. Leuk Res Rep 2021; 16:100268. [PMID: 34584838 PMCID: PMC8455363 DOI: 10.1016/j.lrr.2021.100268] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2021] [Accepted: 09/13/2021] [Indexed: 01/08/2023] Open
Abstract
CD47 is a surface glycoprotein expressed by host cells to impede phagocytosis upon binding to macrophage SIRPα, thereby represents an immune checkpoint known as the "don't-eat-me" signal. However, accumulating evidence shows that solid and hematologic tumor cells overexpress CD47 to escape immune surveillance. Thus, targeting the CD47-SIRPa axis by limiting the activity of this checkpoint has emerged as a key area of research. In this review, we will provide an update on the landscape of CD47-targeting antibodies for hematological malignancies, including monoclonal and bi-specific antibodies, with a special emphasis on agents in clinical trials and novel approaches to overcome toxicity.
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Affiliation(s)
- Jennifer Sun
- Department of Radiation Oncology, Cancer Biology Division, Washington University in St. Louis School of Medicine, 4511 Forest Park Ave, St. Louis, MO 63108, USA
- Department of Biomedical Engineering, Washington University in St. Louis McKelvy School of Engineering, St. Louis, MO, USA
| | - Yixuan Chen
- Department of Radiation Oncology, Cancer Biology Division, Washington University in St. Louis School of Medicine, 4511 Forest Park Ave, St. Louis, MO 63108, USA
| | - Berit Lubben
- Department of Radiation Oncology, Cancer Biology Division, Washington University in St. Louis School of Medicine, 4511 Forest Park Ave, St. Louis, MO 63108, USA
| | - Ola Adebayo
- Department of Radiation Oncology, Cancer Biology Division, Washington University in St. Louis School of Medicine, 4511 Forest Park Ave, St. Louis, MO 63108, USA
| | - Barbara Muz
- Department of Radiation Oncology, Cancer Biology Division, Washington University in St. Louis School of Medicine, 4511 Forest Park Ave, St. Louis, MO 63108, USA
| | - Abdel Kareem Azab
- Department of Radiation Oncology, Cancer Biology Division, Washington University in St. Louis School of Medicine, 4511 Forest Park Ave, St. Louis, MO 63108, USA
- Department of Biomedical Engineering, Washington University in St. Louis McKelvy School of Engineering, St. Louis, MO, USA
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16
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Lentz RW, Colton MD, Mitra SS, Messersmith WA. Innate Immune Checkpoint Inhibitors: The Next Breakthrough in Medical Oncology? Mol Cancer Ther 2021; 20:961-974. [PMID: 33850005 PMCID: PMC9028741 DOI: 10.1158/1535-7163.mct-21-0041] [Citation(s) in RCA: 68] [Impact Index Per Article: 22.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2021] [Revised: 03/01/2021] [Accepted: 03/29/2021] [Indexed: 11/16/2022]
Abstract
While immunotherapy has revolutionized the treatment of many types of advanced cancer, most patients still do not derive benefit. The currently available immune checkpoint inhibitors target the adaptive immune system, generating a T-cell antitumor response. However, an antitumor immune response depends on a complex interplay of both innate and adaptive immune cells. The innate immune system is a promising new target, and innate immune checkpoint inhibitors can disrupt inhibitory interactions ("don't eat me" signals) between tumor and both phagocytes and natural killer cells. The checkpoint inhibitor may also provide a stimulatory interaction ("eat me" signal), or this can be achieved through use of combination therapy. This generates antitumor effector functions including phagocytosis, natural cytotoxicity, antibody-dependent effects, and synergistic activation of the adaptive immune system via antigen presentation. This is a rapidly expanding area of drug development, either alone or in combination (with anticancer antibodies or adaptive immune checkpoint inhibitors). Here, we comprehensively review the mechanism of action and up-to-date solid tumor clinical trial data of the drugs targeting phagocytosis checkpoints (SIRPα/CD47, LILRB1/MHC-I, and LILRB2/MHC-I) and natural killer-cell checkpoints (TIGIT/CD112 + CD155, PVRIG/CD112, KIRs/MHC-I, and NKG2A-CD94/HLA-E). Innate immune checkpoint inhibitors could once again revolutionize immune-based cancer therapies.
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Affiliation(s)
- Robert W Lentz
- Division of Medical Oncology, Department of Medicine, University of Colorado School of Medicine, Aurora, Colorado
| | - Meryl D Colton
- Department of Medicine, University of Colorado School of Medicine, Aurora, Colorado
| | - Siddhartha S Mitra
- Division of Hematology, Oncology, and Bone Marrow Transplant, Department of Pediatrics, University of Colorado School of Medicine, Aurora, Colorado
| | - Wells A Messersmith
- Division of Medical Oncology, Department of Medicine, University of Colorado School of Medicine, Aurora, Colorado.
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