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Zeng L, Yang K, Yu G, Chen J, Long Z, Xiang W, Liu S, Zheng Y, Yan Y, Hao M, Sun L. Efficacy and safety of culture-expanded mesenchymal stromal cell therapy in the treatment of 4 types of inflammatory arthritis: A systematic review and meta-analysis of 36 randomized controlled trials. Semin Arthritis Rheum 2024; 68:152498. [PMID: 38970896 DOI: 10.1016/j.semarthrit.2024.152498] [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: 03/22/2024] [Revised: 05/09/2024] [Accepted: 05/29/2024] [Indexed: 07/08/2024]
Abstract
OBJECTIVE This study aims to assess the effectiveness and safety of mesenchymal stem cell (MSC) transplantation in the treatment of inflammatory arthritis. METHODS Two researchers conducted a comprehensive search of Chinese and English databases from their inception until July 2023. The literature screening and data extraction were then performed. Statistical analysis was carried out using RevMan 5.4 software. RESULTS A total of 36 relevant RCTs, involving 2,076 participants, were ultimately included in this study. These RCTs encompassed four types of inflammatory arthritis, namely rheumatoid arthritis (RA), osteoarthritis (OA), ankylosing spondylitis (AS), and systemic sclerosis (SSc). The results demonstrated that MSC therapy exhibited improvements in the Visual Analog Scale (VAS) for pain in OA patients (bone marrow: SMD=-0.95, 95 % CI: -1.55 to -0.36, P = 0.002; umbilical cord: SMD=-2.03, 95 % CI: -2.99 to -1.07, P < 0.0001; adipose tissue: SMD=-1.26, 95 % CI: -1.99 to -0.52, P = 0.0009). Specifically, MSCs sourced from adipose tissue showed enhancements in Western Ontario and McMaster Universities Arthritis Index (WOMAC) pain (P = 0.0001), WOMAC physical function (P = 0.001), and total WOMAC scores (P = 0.0003). As for MSC therapy in RA, AS, and SSc, the current systematic review suggests a potential therapeutic effect of MSCs on these inflammatory arthritic conditions. Safety assessments indicated that MSC therapy did not increase the incidence of adverse events. CONCLUSION MSCs have the potential to alleviate joint pain and improve joint function in patients with inflammatory arthritis. Moreover, MSC therapy appears to be relatively safe and could be considered as a viable alternative treatment option for inflammatory arthritis.
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Affiliation(s)
- Liuting Zeng
- Department of Rheumatology and Immunology, Nanjing Drum Tower Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, Graduate School of Peking Union Medical College, Nanjing, China.
| | - Kailin Yang
- Key Laboratory of Hunan Province for Integrated Traditional Chinese and Western Medicine on Prevention and Treatment of Cardio-Cerebral Diseases, School of Integrated Chinese and Western Medicine, Hunan University of Chinese Medicine, Changsha, China; Psychosomatic laboratory, Department of Psychiatry, Daqing Hospital of Traditional Chinese Medicine, Daqing, China.
| | - Ganpeng Yu
- People's Hospital of Ningxiang City, Ningxiang, China
| | - Junpeng Chen
- Psychosomatic laboratory, Department of Psychiatry, Daqing Hospital of Traditional Chinese Medicine, Daqing, China; Department of Physiology, School of Medicine, University of Louisville, Kentucky, USA; Tong Jiecheng Studio, Hunan University of Science and Technology, Xiangtan, China.
| | - Zhiyong Long
- Department of Physical Medicine and Rehabilitation, The Affiliated Panyu Central Hospital of Guangzhou Medical University, Guangzhou, China
| | - Wang Xiang
- The First People's Hospital of Changde City, Changde, China
| | - Shuman Liu
- Department of Rheumatology and Immunology, Nanjing Drum Tower Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, Graduate School of Peking Union Medical College, Nanjing, China
| | - Yaru Zheng
- Department of Rheumatology and Immunology, Nanjing Drum Tower Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, Graduate School of Peking Union Medical College, Nanjing, China
| | - Yexing Yan
- Psychosomatic laboratory, Department of Psychiatry, Daqing Hospital of Traditional Chinese Medicine, Daqing, China
| | - Moujia Hao
- Psychosomatic laboratory, Department of Psychiatry, Daqing Hospital of Traditional Chinese Medicine, Daqing, China
| | - Lingyun Sun
- Department of Rheumatology and Immunology, Nanjing Drum Tower Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, Graduate School of Peking Union Medical College, Nanjing, China; Department of Rheumatology and Immunology, The First Affiliated Hospital of Anhui Medical University, Hefei, China.
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Ladouceur A, Ezdoglian A, Sparks JA, Hudson M, Jamal S, Clifford A, Roberts J, Ye C. The Utility of Laboratory Investigations for the Assessment and Management of Rheumatic Immune Related Adverse Events. Rheum Dis Clin North Am 2024; 50:181-199. [PMID: 38670720 DOI: 10.1016/j.rdc.2024.01.003] [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] [Indexed: 04/28/2024]
Abstract
Immune checkpoint inhibitors (ICIs) have greatly improved survival of several cancers with historically very poor prognosis. ICIs act by stimulating the patient's own immune system to fight cancer. Simultaneously, this immune activation can lead to immune-related adverse events (irAEs), including rheumatic manifestations (Rh-irAEs). Rh-irAEs mimic primary rheumatic diseases including arthritis, polymyalgia rheumatica, myositis, vasculitis, sarcoidosis, and sicca. This article summarizes the latest evidence regarding the utility of laboratory investigations in Rh-irAEs.
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Affiliation(s)
- Alexandra Ladouceur
- Division of Rheumatology, Department of Medicine, Jewish General Hospital and McGill University, 3755 Côte Ste-Catherine Road, Montreal, Quebec H3T 1E2, Canada
| | - Aiarpi Ezdoglian
- Department of Rheumatology and Clinical Immunology, Amsterdam University Medical Center, VU University Medical Center (VUmc), De Boelelaan 1118, Amsterdam 1081 HZ, the Netherlands
| | - Jeffrey A Sparks
- Division of Rheumatology, Inflammation, and Immunity, Department of Medicine, Brigham and Women's Hospital, 60 Fenwood Road, Suite 6016U, Boston, MA 02115, USA
| | - Marie Hudson
- Division of Rheumatology, Department of Medicine, Jewish General Hospital and McGill University, Lady Davis Institute for Medical Research, 3755 Côte Ste-Catherine Road, Montreal, Quebec H3T 1E2, Canada
| | - Shahin Jamal
- Arthritis Research Canada, Department of Medicine, University of British Columbia, Gordon & Leslie Diamond Health Care Centre, 2775 Laurel Street, Ste 8205B, Vancouver, British Columbia V5Z 1M9, Canada
| | - Alison Clifford
- Faculty of Medicine & Dentistry, Department of Medicine, University of Alberta, 8-130 Clinical Sciences Building, 11350 83 Avenue NW, Edmonton, Alberta T6G 2G3, Canada
| | - Janet Roberts
- Division of Rheumatology, Department of Medicine, Queen Elizabeth II Health Sciences Center and Dalhousie University, Nova Scotia rehabilitation and Arthritis Centre, Arthritis Research Canada; Lady Davis Institute for Medical Research, 1341 Summer Street, Halifax, Nova Scotia B3H 4K4, Canada
| | - Carrie Ye
- Department of Medicine, University of Alberta, 8-130 Clinical Sciences Building, 11350 83 Avenue NW, Edmonton, Alberta T6G 2G3, Canada.
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Singh N, Shahane A, Sparks JA, Bitoun S, Cappelli LC. Immune Checkpoint Inhibitor-induced Inflammatory Arthritis: Current Approaches to Management. Rheum Dis Clin North Am 2024; 50:269-279. [PMID: 38670725 PMCID: PMC11139458 DOI: 10.1016/j.rdc.2024.02.002] [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] [Indexed: 04/28/2024]
Abstract
The introduction of immune checkpoint inhibitors (ICIs) has changed the landscape of the treatment of cancer. Several immune-related adverse events (irAEs) have now been described such as ICI-inflammatory arthritis (IA), sicca syndrome, polymyalgia rheumatica, myositis, and vasculitis as a consequence of immune activation. The onset of the ICI-IA can vary from after the first infusion of ICIs to a delayed presentation a year or more after ICI initiation. Ultimately, baseline patient and tumor characteristics, the types of immunotherapies used, pre-existing autoimmune diseases, and/or other irAEs, as well as patient preferences will all shape the discussions around ICI-IA management.
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Affiliation(s)
- Namrata Singh
- Division of Rheumatology, Department of Medicine, University of Washington, 4245 Roosevelt Way Northeast, Seattle, WA 98105, USA
| | - Anupama Shahane
- Division of Rheumatology, Department of Medicine, University of Pennsylvania, 220 South 40th Street, Philadelphia, PA 19104, USA
| | - Jeffrey A Sparks
- Division of Rheumatology, Inflammation, and Immunity, Brigham and Women's Hospital and Harvard Medical School, 12 Braddock Park, Unit 2, Boston, MA 02116, USA
| | - Samuel Bitoun
- Department of Rheumatology, Université Paris-Saclay, Hôpital Bicêtre, Assistance Publique - Hôpitaux de Paris, FHU CARE, INSERM UMR1184, 78, Avenue du General Leclerc, Le Kremlin Bicêtre 94270, France
| | - Laura C Cappelli
- Division of Rheumatology, Department of Medicine, Johns Hopkins University School of Medicine, 5501 Hopkins Bayview Circle, Suite 1B1, Baltimore, MD 21224, USA.
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Zhao J, Feng Y, Liu GW. Knowledge domains and emerging trends in immune-related adverse events from immune checkpoint inhibitors: A bibliometrics and visualized analysis. Heliyon 2024; 10:e27832. [PMID: 38515725 PMCID: PMC10955301 DOI: 10.1016/j.heliyon.2024.e27832] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/18/2023] [Revised: 03/05/2024] [Accepted: 03/07/2024] [Indexed: 03/23/2024] Open
Abstract
Objective The primary objective of this paper is to investigate the research hotspots and future trends of immune-related adverse events induced by immune checkpoint inhibitors, offering valuable insights for researchers in this field. Methodology Using the visual analysis software, this study conducted quantitative statistics and visualization research on the relevant literature concerning immune-related adverse events caused by immune checkpoint inhibitors in the Web of Science Core Collection Database. By evaluating the publication trends, countries, institutions, keywords, research status, cited documents, and document co-citations, among several others, the discussion revolved around the hot spots and future development trends in this field and provided references for future research. Findings and conclusions A total of 514 English articles were included, and the top three countries in the research field at the time of this study were the United States, Japan, and China. More specifically, the University of Texas MD Anderson Cancer Center, Dana-Farber Cancer Institute, and Massachusetts General Hospital have been the top three research institutes with more than 10 publications. The frequency of keyword use linked to immune-related adverse events caused by immune checkpoint inhibitors in literature research has been steadily growing over the years. Additionally, the research with respect to the disease focuses on melanoma, cell lung cancer, hepatocellular carcinoma, and breast cancer. In the context of drugs, cancer-related research has mainly focused on the combined use of nivolumab, pembrolizumab, ipilimumab, and immune checkpoint inhibitors. Meanwhile, research on adverse events has delved into the immune checkpoint inhibitors causing vitiligo, thyroid dysfunction, pancreatitis, cholangitis, and rheumatism. Related studies cover acute arthritis, myositis, acute kidney injury, as well as the combination therapy of immune checkpoint inhibitors and docetaxel, management of irAEs in cancer immunotherapy, and biomarkers of immune adverse reactions of immune checkpoint inhibitors. Finally, case report studies of immune adverse reactions caused by immune checkpoint inhibitors could serve as research hotspots in the future.
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Affiliation(s)
- Jun Zhao
- Department of Pharmacy, The Affiliated Hospital of Qingdao University, Qingdao, Shandong, 266003, China
| | - Yujie Feng
- Department of Hepatobiliary and Pancreatic Surgery, The Affiliated Hospital of Qingdao University, Qingdao, shandong, 266003, China
| | - Guang-wei Liu
- Department of Gastrointestinal Surgery, The Affiliated Hospital of Qingdao University, Qingdao, shandong, 266003, China
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Abstract
PURPOSE OF REVIEW Immune check point inhibitors (ICIs) are a unique class of cancer treatments that harness the body's innate antitumor response. Although these medications have transformed oncology care, they also lead to generalized immune activation that can result in toxicities across a spectrum of organ systems called immune-related adverse events. This article reviews the most common rheumatologic immune-related adverse events and their management. RECENT FINDINGS Inflammatory arthritis, polymyalgia rheumatic, sicca symptoms, systemic sclerosis, myositis, and vasculitis have all been reported as ICI adverse events. Treatment includes nonsteroidal anti-inflammatory drugs, glucocorticoids, traditional DMARDs, and biologics. SUMMARY Rheumatologists have an important role in the management of patients with rheumatologic immune-related adverse events. Working with our oncology colleagues, we can help manage rheumatologic immune-related adverse events while optimally preserving ICI's antitumor effects.
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Affiliation(s)
- Melissa Defoe
- Division of Rheumatic Diseases, University of Texas Southwestern Medical Center, Dallas, Texas, USA
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Denaro N, Garrone O, Morelli A, Pellegrino B, Merlano MC, Vacca D, Pearce J, Farci D, Musolino A, Scartozzi M, Tommasi C, Solinas C. A narrative review of the principal glucocorticoids employed in cancer. Semin Oncol 2022; 49:429-438. [PMID: 36737303 DOI: 10.1053/j.seminoncol.2023.01.004] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/12/2022] [Revised: 01/15/2023] [Accepted: 01/16/2023] [Indexed: 01/29/2023]
Abstract
Glucocorticoids (GCs) are a pharmacological class of drugs widely used in oncology in both supportive and palliative settings. GCs differentially impact organs with immediate and long-term effects; with suppressive effect on the immune system anchoring their use to manage the toxicities of immune checkpoint inhibitors (ICIs). In addition, GCs are often used in the management of symptoms related to cancer or chemotherapy and as adjuvants in the treatment of pain in the management of other. In the palliative setting, GCs, especially administered subcutaneously can be to assist in the control of nausea, dyspnea, asthenia, and anorexia-cachexia syndrome. In this narrative review, we aim to summarize the role of GCs in the different settings (curative, supportive, and palliative) to help clinicians use these important drugs in their daily clinical practice with cancer patients.
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Affiliation(s)
- Nerina Denaro
- Medical Oncology, Fondazione IRCCS Ca' Granda Ospedale Maggiore Policlinico, Milano, Italy
| | - Ornella Garrone
- Medical Oncology, Fondazione IRCCS Ca' Granda Ospedale Maggiore Policlinico, Milano, Italy
| | | | - Benedetta Pellegrino
- Medical Oncology and Breast Unit, University Hospital of Parma, Italy; Department of Medicine and Surgery, University of Parma, Italy
| | | | - Denise Vacca
- Palliative Care Unit, Ospedale Sirai, Carbonia, ASSL Carbonia, Italy
| | - Josie Pearce
- Harvard Premedical Program, Harvard University, Cambridge, MA, USA
| | - Daniele Farci
- Medical Oncology, Nuova Casa di Cura, Decimomannu, Cagliari, Italy
| | - Antonino Musolino
- Medical Oncology and Breast Unit, University Hospital of Parma, Italy; Department of Medicine and Surgery, University of Parma, Italy
| | - Mario Scartozzi
- Medical Oncology, AOU Cagliari, Policlinico di Monserrato, Cagliari, Italy
| | - Chiara Tommasi
- Medical Oncology and Breast Unit, University Hospital of Parma, Italy; Department of Medicine and Surgery, University of Parma, Italy.
| | - Cinzia Solinas
- Medical Oncology, AOU Cagliari, Policlinico di Monserrato, Cagliari, Italy
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Azuma T, Kano M, Iwata S, Honda S, Miyoshi Y, Nishiguchi J. Utility of periodic medical questionnaires and examinations for immune-related adverse event screening: A prospective observational study. PLoS One 2022; 17:e0274451. [PMID: 36173947 PMCID: PMC9521803 DOI: 10.1371/journal.pone.0274451] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2022] [Accepted: 08/27/2022] [Indexed: 12/18/2022] Open
Abstract
Background Immune checkpoint inhibitors (ICIs) are associated with immune-related adverse events (irAEs) specific to the immunity-boosting activity of the drugs and may necessitate discontinuation of treatment depending on their severity. IrAEs may be difficult to diagnose in their early stages as they can occur in any organ. The present, prospective, observational study is the first to attempt to assess the utility of periodic medical questionnaires and laboratory, radiological, and physiological examinations in diagnosing irAEs. Methods We analyzed 51 patients who received immunotherapy for metastatic renal or urothelial carcinoma at Tokyo Metropolitan Tama Medical Center between 2016 and 2020. A medical questionnaire consisting of 41 questions and laboratory tests were administered to the patients on the day of each ICI administration and 1 week afterwards. A significant complaint was defined as a complaint not addressed in the questionnaire immediately prior to the first ICI administration. Results Fifty-one patients with metastatic renal or urothelial carcinoma were enrolled. The mean age was 72.1 years (range: 54–88 years). The male: female ratio was 32: 19. Of the total cohort, 26 (51%) patients had renal carcinoma, and 25 (49%) had urothelial carcinoma. The median follow-up time was 2.6 (range: 0.4–40.7) months. Thirty-three patients (65%) experienced irAEs. Conclusions In our cohort, periodic medical questionnaires and examinations were effective for early diagnosis and prompt treatment of irAEs. Although periodic examinations led to a high irAE diagnosis rate, the attendant medical cost was high. Further study is needed to find ways of addressing this issue.
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Affiliation(s)
- Takeshi Azuma
- Division of Urology, Tokyo Metropolitan Tama Medical Center, Fuchu, Tokyo, Japan
- * E-mail:
| | - Masato Kano
- Division of Urology, Tokyo Metropolitan Tama Medical Center, Fuchu, Tokyo, Japan
| | - Shohei Iwata
- Division of Urology, Tokyo Metropolitan Tama Medical Center, Fuchu, Tokyo, Japan
| | - Sachi Honda
- Division of Urology, Tokyo Metropolitan Tama Medical Center, Fuchu, Tokyo, Japan
| | - Yuji Miyoshi
- Department of Rheumatic Diseases, Tokyo Metropolitan Tama Medical Center, Fuchu, Tokyo, Japan
| | - Junko Nishiguchi
- Division of Nursing, Tokyo Metropolitan Tama Medical Center, Fuchu, Tokyo, Japan
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Aboo C, Krastrup TW, Tenstad HB, Ren J, Just SA, Ladekarl M, Stensballe A. Prediction and early diagnosis of immune-checkpoint inhibitor-induced inflammatory arthritis from molecular biomarkers – Where are we now? EXPERT REVIEW OF PRECISION MEDICINE AND DRUG DEVELOPMENT 2022. [DOI: 10.1080/23808993.2022.2156785] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Affiliation(s)
- Christopher Aboo
- Department of Health Science and Technology, Aalborg University, Aalborg, Denmark
- Sino-Danish Center for Education and Research, University of Chinese Academy of Sciences, Beijing, China
- CAS Key Laboratory of Genomic and Precision Medicine, Beijing Institute of Genomics, Beijing, China
| | - Tue Wenzel Krastrup
- Department of Biomedicine, Aarhus University, Aarhus, Denmark
- Department of Rheumatology, Aarhus University Hospital, Aarhus, Denmark
| | | | - Jie Ren
- CAS Key Laboratory of Genomic and Precision Medicine, Beijing Institute of Genomics, Beijing, China
| | | | - Morten Ladekarl
- Department of Oncology and Clinical Cancer Research Center, Aalborg University Hospital, Aalborg, Denmark
| | - Allan Stensballe
- Department of Health Science and Technology, Aalborg University, Aalborg, Denmark
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Cho Y, Anderson EW, Guevara SJ, Miyara SJ, Maria N, Metz CN, Zafeiropoulos S, Giannis D, Wang J, Abidoye O, Mumford JM, Aronsohn J, Molmenti E, Sohail H. Diagnostic Dilemma of Paraneoplastic Rheumatic Disorders: Case Series and Narrative Review. Cureus 2021; 13:e19993. [PMID: 34984145 PMCID: PMC8715838 DOI: 10.7759/cureus.19993] [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] [Accepted: 11/29/2021] [Indexed: 11/27/2022] Open
Abstract
Paraneoplastic rheumatic disorder (RD) is a disorder that may present before, concurrent with, or after the diagnosis of malignancy. Paraneoplastic RDs are a clinical expression of occult cancer that is not directly related to a tumor or metastasis and manifests as rheumatoid symptoms. The RD is determined by the organ system affected by articular, muscular, cutaneous, vascular, or miscellaneous symptoms. Each case is challenging to diagnose because cancer may present with similar symptoms as a common rheumatic disorder. Of note, the majority of cases have minimal responsiveness or no responsiveness to standard rheumatoid treatment. Therefore, it is imperative to recognize and treat the underlying cancer accordingly. Herein, we present four different diagnostic dilemma cases of RD: case #1 - leukocytoclastic vasculitis and C3 glomerulopathy, case #2 - scleroderma, case #3 - Raynaud’s syndrome and possible lupus-like syndrome, and case #4 - inflammatory myositis. Institutional IRB approval was obtained for this case series. We will discuss and review the literature on each topic. In addition, we will mention a review of paraneoplastic rheumatoid arthritis. As rheumatic disease is associated with the use of immune checkpoint inhibitors (ICIs) for cancer treatment, we will briefly discuss some of the most common rheumatic presentations in the setting of these drugs. This case review aims to inform clinicians about the atypical presentation of paraneoplastic RD and to highlight the need for interdisciplinary management between rheumatologists, oncologists, and primary care practitioners.
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Zhou K, Guo S, Li F, Sun Q, Liang G. Exosomal PD-L1: New Insights Into Tumor Immune Escape Mechanisms and Therapeutic Strategies. Front Cell Dev Biol 2020; 8:569219. [PMID: 33178688 PMCID: PMC7593554 DOI: 10.3389/fcell.2020.569219] [Citation(s) in RCA: 32] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/03/2020] [Accepted: 08/27/2020] [Indexed: 12/15/2022] Open
Abstract
As a classical immune checkpoint molecule, PD-L1 on the surface of tumor cells plays a pivotal role in tumor immunosuppression, primarily by inhibiting the antitumor activities of T cells by binding to its receptor PD-1. PD-1/PD-L1 inhibitors have demonstrated unprecedented promise in treating various human cancers with impressive efficacy. However, a significant portion of cancer patients remains less responsive. Therefore, a better understanding of PD-L1-mediated immune escape is imperative. PD-L1 can be expressed on the surface of tumor cells, but it is also found to exist in extracellular forms, such as on exosomes. Recent studies have revealed the importance of exosomal PD-L1 (ExoPD-L1). As an alternative to membrane-bound PD-L1, ExoPD-L1 produced by tumor cells also plays an important regulatory role in the antitumor immune response. We review the recent remarkable findings on the biological functions of ExoPD-L1, including the inhibition of lymphocyte activities, migration to PD-L1-negative tumor cells and immune cells, induction of both local and systemic immunosuppression, and promotion of tumor growth. We also discuss the potential implications of ExoPD-L1 as a predictor for disease progression and treatment response, sensitive methods for detection of circulating ExoPD-L1, and the novel therapeutic strategies combining the inhibition of exosome biogenesis with PD-L1 blockade in the clinic.
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Affiliation(s)
- Kaijian Zhou
- Department of Plastic Surgery, The First Affiliated Hospital of China Medical University, Shenyang, China
| | - Shu Guo
- Department of Plastic Surgery, The First Affiliated Hospital of China Medical University, Shenyang, China
- *Correspondence: Shu Guo,
| | - Fei Li
- Department of Pharmaceutical Science, The First Affiliated Hospital of China Medical University, Shenyang, China
| | - Qiang Sun
- Department of Plastic Surgery, The First Affiliated Hospital of China Medical University, Shenyang, China
| | - Guoxin Liang
- Cancer Therapy Research Institute, The First Affiliated Hospital of China Medical University, Shenyang, China
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