1
|
Bos S, Pradère P, Beeckmans H, Zajacova A, Vanaudenaerde BM, Fisher AJ, Vos R. Lymphocyte Depleting and Modulating Therapies for Chronic Lung Allograft Dysfunction. Pharmacol Rev 2023; 75:1200-1217. [PMID: 37295951 PMCID: PMC10595020 DOI: 10.1124/pharmrev.123.000834] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2023] [Revised: 04/27/2023] [Accepted: 06/05/2023] [Indexed: 06/12/2023] Open
Abstract
Chronic lung rejection, also called chronic lung allograft dysfunction (CLAD), remains the major hurdle limiting long-term survival after lung transplantation, and limited therapeutic options are available to slow the progressive decline in lung function. Most interventions are only temporarily effective in stabilizing the loss of or modestly improving lung function, with disease progression resuming over time in the majority of patients. Therefore, identification of effective treatments that prevent the onset or halt progression of CLAD is urgently needed. As a key effector cell in its pathophysiology, lymphocytes have been considered a therapeutic target in CLAD. The aim of this review is to evaluate the use and efficacy of lymphocyte depleting and immunomodulating therapies in progressive CLAD beyond usual maintenance immunosuppressive strategies. Modalities used include anti-thymocyte globulin, alemtuzumab, methotrexate, cyclophosphamide, total lymphoid irradiation, and extracorporeal photopheresis, and to explore possible future strategies. When considering both efficacy and risk of side effects, extracorporeal photopheresis, anti-thymocyte globulin and total lymphoid irradiation appear to offer the best treatment options currently available for progressive CLAD patients. SIGNIFICANCE STATEMENT: Effective treatments to prevent the onset and progression of chronic lung rejection after lung transplantation are still a major shortcoming. Based on existing data to date, considering both efficacy and risk of side effects, extracorporeal photopheresis, anti-thymocyte globulin, and total lymphoid irradiation are currently the most viable second-line treatment options. However, it is important to note that interpretation of most results is hampered by the lack of randomized controlled trials.
Collapse
Affiliation(s)
- Saskia Bos
- Newcastle University Translational and Clinical Research Institute, Newcastle upon Tyne, United Kingdom (S.B., P.P., A.J.F.); Institute of Transplantation, Newcastle Upon Tyne Hospitals NHS Trust, Newcastle Upon Tyne, United Kingdom (S.B., A.J.F.); Hôpital Marie Lannelongue, Groupe Hospitalier Paris Saint Joseph and Paris Saclay University, Department of Respiratory Diseases, Paris, France (P.P.); Department of CHROMETA, Laboratory of Respiratory Diseases and Thoracic Surgery (BREATHE), KU Leuven, Leuven, Belgium (H.B., B.M.V., R.V.); Prague Lung Transplant Program, University Hospital Motol, Department of Pneumology, Prague, Czech Republic (A.Z.); and University Hospitals Leuven, Department of Respiratory Diseases, Leuven, Belgium (R.V.)
| | - Pauline Pradère
- Newcastle University Translational and Clinical Research Institute, Newcastle upon Tyne, United Kingdom (S.B., P.P., A.J.F.); Institute of Transplantation, Newcastle Upon Tyne Hospitals NHS Trust, Newcastle Upon Tyne, United Kingdom (S.B., A.J.F.); Hôpital Marie Lannelongue, Groupe Hospitalier Paris Saint Joseph and Paris Saclay University, Department of Respiratory Diseases, Paris, France (P.P.); Department of CHROMETA, Laboratory of Respiratory Diseases and Thoracic Surgery (BREATHE), KU Leuven, Leuven, Belgium (H.B., B.M.V., R.V.); Prague Lung Transplant Program, University Hospital Motol, Department of Pneumology, Prague, Czech Republic (A.Z.); and University Hospitals Leuven, Department of Respiratory Diseases, Leuven, Belgium (R.V.)
| | - Hanne Beeckmans
- Newcastle University Translational and Clinical Research Institute, Newcastle upon Tyne, United Kingdom (S.B., P.P., A.J.F.); Institute of Transplantation, Newcastle Upon Tyne Hospitals NHS Trust, Newcastle Upon Tyne, United Kingdom (S.B., A.J.F.); Hôpital Marie Lannelongue, Groupe Hospitalier Paris Saint Joseph and Paris Saclay University, Department of Respiratory Diseases, Paris, France (P.P.); Department of CHROMETA, Laboratory of Respiratory Diseases and Thoracic Surgery (BREATHE), KU Leuven, Leuven, Belgium (H.B., B.M.V., R.V.); Prague Lung Transplant Program, University Hospital Motol, Department of Pneumology, Prague, Czech Republic (A.Z.); and University Hospitals Leuven, Department of Respiratory Diseases, Leuven, Belgium (R.V.)
| | - Andrea Zajacova
- Newcastle University Translational and Clinical Research Institute, Newcastle upon Tyne, United Kingdom (S.B., P.P., A.J.F.); Institute of Transplantation, Newcastle Upon Tyne Hospitals NHS Trust, Newcastle Upon Tyne, United Kingdom (S.B., A.J.F.); Hôpital Marie Lannelongue, Groupe Hospitalier Paris Saint Joseph and Paris Saclay University, Department of Respiratory Diseases, Paris, France (P.P.); Department of CHROMETA, Laboratory of Respiratory Diseases and Thoracic Surgery (BREATHE), KU Leuven, Leuven, Belgium (H.B., B.M.V., R.V.); Prague Lung Transplant Program, University Hospital Motol, Department of Pneumology, Prague, Czech Republic (A.Z.); and University Hospitals Leuven, Department of Respiratory Diseases, Leuven, Belgium (R.V.)
| | - Bart M Vanaudenaerde
- Newcastle University Translational and Clinical Research Institute, Newcastle upon Tyne, United Kingdom (S.B., P.P., A.J.F.); Institute of Transplantation, Newcastle Upon Tyne Hospitals NHS Trust, Newcastle Upon Tyne, United Kingdom (S.B., A.J.F.); Hôpital Marie Lannelongue, Groupe Hospitalier Paris Saint Joseph and Paris Saclay University, Department of Respiratory Diseases, Paris, France (P.P.); Department of CHROMETA, Laboratory of Respiratory Diseases and Thoracic Surgery (BREATHE), KU Leuven, Leuven, Belgium (H.B., B.M.V., R.V.); Prague Lung Transplant Program, University Hospital Motol, Department of Pneumology, Prague, Czech Republic (A.Z.); and University Hospitals Leuven, Department of Respiratory Diseases, Leuven, Belgium (R.V.)
| | - Andrew J Fisher
- Newcastle University Translational and Clinical Research Institute, Newcastle upon Tyne, United Kingdom (S.B., P.P., A.J.F.); Institute of Transplantation, Newcastle Upon Tyne Hospitals NHS Trust, Newcastle Upon Tyne, United Kingdom (S.B., A.J.F.); Hôpital Marie Lannelongue, Groupe Hospitalier Paris Saint Joseph and Paris Saclay University, Department of Respiratory Diseases, Paris, France (P.P.); Department of CHROMETA, Laboratory of Respiratory Diseases and Thoracic Surgery (BREATHE), KU Leuven, Leuven, Belgium (H.B., B.M.V., R.V.); Prague Lung Transplant Program, University Hospital Motol, Department of Pneumology, Prague, Czech Republic (A.Z.); and University Hospitals Leuven, Department of Respiratory Diseases, Leuven, Belgium (R.V.)
| | - Robin Vos
- Newcastle University Translational and Clinical Research Institute, Newcastle upon Tyne, United Kingdom (S.B., P.P., A.J.F.); Institute of Transplantation, Newcastle Upon Tyne Hospitals NHS Trust, Newcastle Upon Tyne, United Kingdom (S.B., A.J.F.); Hôpital Marie Lannelongue, Groupe Hospitalier Paris Saint Joseph and Paris Saclay University, Department of Respiratory Diseases, Paris, France (P.P.); Department of CHROMETA, Laboratory of Respiratory Diseases and Thoracic Surgery (BREATHE), KU Leuven, Leuven, Belgium (H.B., B.M.V., R.V.); Prague Lung Transplant Program, University Hospital Motol, Department of Pneumology, Prague, Czech Republic (A.Z.); and University Hospitals Leuven, Department of Respiratory Diseases, Leuven, Belgium (R.V.)
| |
Collapse
|
2
|
Patterson CM, Jolly EC, Burrows F, Ronan NJ, Lyster H. Conventional and Novel Approaches to Immunosuppression in Lung Transplantation. Clin Chest Med 2023; 44:121-136. [PMID: 36774159 DOI: 10.1016/j.ccm.2022.10.009] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/11/2023]
Abstract
Most therapeutic advances in immunosuppression have occurred over the past few decades. Although modern strategies have been effective in reducing acute cellular rejection, excess immunosuppression comes at the price of toxicity, opportunistic infection, and malignancy. As our understanding of the immune system and allograft rejection becomes more nuanced, there is an opportunity to evolve immunosuppression protocols to optimize longer term outcomes while mitigating the deleterious effects of traditional protocols.
Collapse
Affiliation(s)
- Caroline M Patterson
- Transplant Continuing Care Unit, Royal Papworth Hospital NHS Foundation Trust, Cambridge, United Kingdom
| | - Elaine C Jolly
- Division of Renal Medicine, Department of Medicine, University of Cambridge, Cambridge, United Kingdom
| | - Fay Burrows
- Department of Pharmacy, St Vincent's Hospital, Sydney, New South Wales, Australia
| | - Nicola J Ronan
- Transplant Continuing Care Unit, Royal Papworth Hospital NHS Foundation Trust, Cambridge, United Kingdom
| | - Haifa Lyster
- Cardiothoracic Transplant Unit, Royal Brompton and Harefield Hospitals, Part of Guy's & St Thomas' NHS Foundation Trust, London, United Kingdom; Kings College, London, United Kingdom; Pharmacy Department, Royal Brompton and Harefield Hospitals, Part of Guy's & St Thomas' NHS Foundation Trust, London, United Kingdom.
| |
Collapse
|
3
|
Geng-Cahuayme AAA, Sáez-Giménez B, Altabas-González M, Vázquez-Varela M, Berastegui-Garcia C, Giralt-López de Sagredo J, Zapata-Ortega M, Recalde-Vizcay E, López-Meseguer M. Efficacy and safety of total lymphoid irradiation in different chronic lung allograft dysfunction phenotypes. Clin Transplant 2023; 37:e14891. [PMID: 36583252 DOI: 10.1111/ctr.14891] [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: 09/13/2022] [Revised: 12/16/2022] [Accepted: 12/20/2022] [Indexed: 12/31/2022]
Abstract
Total lymphoid irradiation (TLI) is an alternative treatment for chronic lung allograft dysfunction (CLAD). However, data regarding its efficacy and tolerance are scarce. This study included patients with CLAD treated with TLI at our center between 2011 and 2018. Clinical characteristics before and after TLI and related complications were analyzed. Forty patients with CLAD (twenty-nine bronchiolitis obliterans syndrome [BOS], nine restrictive allograft syndrome [RAS], and two mixed) were included. Significant attenuation of the forced expiratory volume in 1-sec (FEV1 ) decline slope was observed in all phenotypes, in both the BOS and RAS. The median FEV1 12, 6, and 3 months pre-TLI were as follows: 1980 (IQR 1720-2560), 1665 (IQR 1300-2340) and 1300 (IQR 1040-1740) ml (p < .001), while the median FEV1 at 3, 6, and 12 months post-TLI was 1110 (IQR 810-1440), 1130 (IQR 860-1470), and 1115 (IQR 865-1490) ml (p = .769). No dropouts due to radiation toxicity were observed. The mean survival according to the Karnofsky Performance Status Scale (KPS) >70 or ≤70 at baseline was 1837 (IQR 259-2522) versus 298 (IQR 128-554) days (p < .0001), respectively. In conclusion, TLI may stop FEV1 decline in both BOS and RAS. Moreover, a good KPS score may be an important prognostic factor.
Collapse
Affiliation(s)
| | - Berta Sáez-Giménez
- Lung Transplant Unit, Department of Respiratory Medicine, Vall d'Hebron University Hospital, Barcelona, Spain.,Department of Cell Biology, Physiology and Immunology, Universitat Autònoma de Barcelona, Barcelona, Spain
| | | | - Miriam Vázquez-Varela
- Department of Radiation Oncology, Vall d'Hebron University Hospital, Barcelona, Spain
| | - Cristina Berastegui-Garcia
- Lung Transplant Unit, Department of Respiratory Medicine, Vall d'Hebron University Hospital, Barcelona, Spain.,Department of Medicine, Universitat Autònoma de Barcelona, Barcelona, Spain
| | | | - Marta Zapata-Ortega
- Lung Transplant Unit, Department of Respiratory Medicine, Vall d'Hebron University Hospital, Barcelona, Spain
| | - Enar Recalde-Vizcay
- Department of Radiation Oncology, Vall d'Hebron University Hospital, Barcelona, Spain
| | - Manuel López-Meseguer
- Lung Transplant Unit, Department of Respiratory Medicine, Vall d'Hebron University Hospital, Barcelona, Spain
| |
Collapse
|
4
|
COVID-Related Chronic Allograft Dysfunction in Lung Transplant Recipients: Long-Term Follow-up Results from Infections Occurring in the Pre-vaccination Era. TRANSPLANTOLOGY 2022. [DOI: 10.3390/transplantology3040028] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
Introduction: We report on characteristics and lung function outcomes among lung transplant recipients (LTRs) after COVID-19 with infections occurring in the first year of the coronavirus pandemic prior to introduction of the vaccines. Methods: This was a retrospective study of 18 LTRs who tested positive for SARS-CoV-2 between 1 February 2020 and 1 March 2021. The mean age was 49.9 (22–68) years; 12 patients (67%) were male. Two patients died due to severe COVID-19. Results: During the study period, there were 18 lung transplant recipients with a community-acquired SARS-CoV-2 infection. In this cohort, seven had mild, nine had moderate, and two had severe COVID-19. All patients with mild and moderate COVID-19 survived, but the two patients with severe COVID-19 died in the intensive care unit while intubated and on mechanical ventilation. Most patients with moderate COVID-19 showed a permanent lung function decrease that did not improve after 12 months. Conclusion: A majority of LTRs in the current cohort did not experience an alteration in the trajectory of FEV1 evolution after developing SARS-CoV-2 infection. However, in the patients with moderate COVID-19, most patients had a decline in the FEV1 that was present after 1 month after recovery and did not improve or even deteriorated further after 12 months. In LTRs, COVID-19 can have long-lasting effects on pulmonary function. Treatment strategies that influence this trajectory are needed.
Collapse
|
5
|
Hao X, Peng C, Lian W, Liu H, Fu G. Effect of azithromycin on bronchiolitis obliterans syndrome in posttransplant recipients: A systematic review and meta-analysis. Medicine (Baltimore) 2022; 101:e29160. [PMID: 35839027 PMCID: PMC11132355 DOI: 10.1097/md.0000000000029160] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/01/2021] [Accepted: 03/07/2022] [Indexed: 12/29/2022] Open
Abstract
BACKGROUND Bronchiolitis obliterans syndrome (BOS) is a devastating complication that occurs after transplantation. Although azithromycin is currently used for the treatment of BOS, the evidence is sparse and controversial. The aim of this meta-analysis is to evaluate the effects of azithromycin on forced expiratory volume in 1 second (FEV1) and patient's survival. METHODS PubMed, Embase, Cochrane library, Web of Science databases, and the ClinicalTrials.gov registry were systematically searched from inception until December 2020 for relevant original research articles. Random-effects models were used to calculate pooled-effect estimates. RESULTS Searches identified 15 eligible studies involving 694 participants. For FEV1 (L), there was a significant increase after short-term (≤12 weeks; P = .00) and mid-term (12-24 weeks; P = .01) administration of azithromycin. For FEV1 (%) compared to baseline, there was a significant increase after short-term (≤12 weeks) administration of azithromycin (P = .02), while there were no statistically significant differences in the medium and long term. When pooled FEV1% was predicted, it exhibited a similar trend to FEV1 (%) compared to baseline. In addition, we discovered that azithromycin reduced the risk of death (hazard ratio = 0.26; 95% confidence interval = 0.17 to 0.40; P = .00) in patients with BOS post-lung transplantation. CONCLUSIONS Azithromycin therapy is both effective and safe for lung function improvement in patients with posttransplant BOS after the short- and medium-term administration. Additionally, it has been demonstrated a significant survival benefit among patients with BOS post-lung transplant. Higher quality randomized controlled trials and more extensive prospective cohort studies are needed to confirm the effect of azithromycin on patients with posttransplant BOS.
Collapse
Affiliation(s)
- Xiaohui Hao
- Department of Pharmacy, Medical Supplies Center of the Chinese PLA General Hospital, Beijing, People’s Republic of China
| | - Cheng Peng
- Department of Pharmacy, Medical Supplies Center of the Chinese PLA General Hospital, Beijing, People’s Republic of China
| | - Wenwen Lian
- Department of Pharmacy, China-Japan Friendship Hospital, Beijing, People’s Republic of China
| | - Han Liu
- Department of Pharmacy, Medical Supplies Center of the Chinese PLA General Hospital, Beijing, People’s Republic of China
| | - Guiying Fu
- Department of Pharmacy, Medical Supplies Center of the Chinese PLA General Hospital, Beijing, People’s Republic of China
| |
Collapse
|
6
|
Venado A, Kukreja J, Greenland JR. Chronic Lung Allograft Dysfunction. Thorac Surg Clin 2022; 32:231-242. [PMID: 35512941 DOI: 10.1016/j.thorsurg.2021.11.004] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
Chronic lung allograft dysfunction (CLAD) is a syndrome of progressive lung function decline, subcategorized into obstructive, restrictive, and mixed phenotypes. The trajectory of CLAD is variable depending on the phenotype, with restrictive and mixed phenotypes having more rapid progression and lower survival. The mechanisms driving CLAD development remain unclear, though allograft injury during primary graft dysfunction, acute cellular rejection, antibody-mediated rejection, and infections trigger immune responses with long-lasting effects that can lead to CLAD months or years later. Currently, retransplantation is the only effective treatment.
Collapse
Affiliation(s)
- Aida Venado
- Division of Pulmonary, Critical Care, Allergy, and Sleep Medicine, University of California, San Francisco, 505 Parnassus Ave, M1093A, San Francisco, CA 94143-2204, USA.
| | - Jasleen Kukreja
- Division of Cardiothoracic Surgery, Univeristy of California, San Francisco, 500 Parnassus Ave, MU 405W Suite 305, San Francisco, CA 94143, USA
| | - John R Greenland
- Division of Pulmonary, Critical Care, Allergy, and Sleep Medicine, University of California, San Francisco, SF VAHCS Building 2, Room 453 (Mail stop 111D), 4150 Clement St, San Francisco CA 94121, USA
| |
Collapse
|
7
|
Pulmonary graft-versus-host disease and chronic lung allograft dysfunction: two sides of the same coin? THE LANCET RESPIRATORY MEDICINE 2022; 10:796-810. [DOI: 10.1016/s2213-2600(22)00001-7] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/27/2021] [Revised: 12/17/2021] [Accepted: 01/04/2022] [Indexed: 11/23/2022]
|
8
|
Bedair B, Hachem RR. Management of chronic rejection after lung transplantation. J Thorac Dis 2022; 13:6645-6653. [PMID: 34992842 PMCID: PMC8662511 DOI: 10.21037/jtd-2021-19] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2020] [Accepted: 05/20/2021] [Indexed: 12/17/2022]
Abstract
Outcomes after lung transplantation are limited by chronic lung allograft dysfunction (CLAD). The incidence of CLAD is high, and its clinical course tends to be progressive over time, culminating in graft failure and death. Indeed, CLAD is the leading cause of death beyond the first year after lung transplantation. Therapy for CLAD has been limited by a lack of high-quality studies to guide management. In this review, we will discuss the diagnosis of CLAD in light of the recent changes to definitions and will discuss the current clinical evidence available for treatment. Recently, the diagnosis of CLAD has been subdivided into bronchiolitis obliterans syndrome (BOS) and restrictive allograft syndrome (RAS). The current evidence for treatment of CLAD mainly revolves around treatment of BOS with more limited data existing for RAS. The best supported treatment to date for CLAD is the macrolide antibiotic azithromycin which has been associated with a small improvement in lung function in a minority of patients. Other therapies that have more limited data include switching immunosuppression from cyclosporine to tacrolimus, fundoplication for gastroesophageal reflux, montelukast, extracorporeal photopheresis (ECP), aerosolized cyclosporine, cytolytic anti-lymphocyte therapies, total lymphoid irradiation (TLI) and the antifibrotic agent pirfenidone. Most of these treatments are supported by case series and observational studies. Finally, we will discuss the role of retransplantation for CLAD.
Collapse
Affiliation(s)
- Bahaa Bedair
- Division of Pulmonary & Critical Care Medicine, Washington University School of Medicine, MO 63110, USA
| | - Ramsey R Hachem
- Division of Pulmonary & Critical Care Medicine, Washington University School of Medicine, MO 63110, USA
| |
Collapse
|
9
|
Immunosuppression in Lung Transplantation. Handb Exp Pharmacol 2021; 272:139-164. [PMID: 34796380 DOI: 10.1007/164_2021_548] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
Abstract
Immunosuppression in lung transplantation is an area devoid of robust clinical data. This chapter will review the history of immunosuppression in lung transplantation. Additionally, it will evaluate the three classes of induction, maintenance, and rescue immunosuppression in detail. Induction immunosuppression in lung transplantation aims to decrease incidence of lung allograft rejection, however infectious risk must be considered when determining if induction is appropriate and which agent is most favorable. Similar to other solid organ transplant patient populations, a multi-drug approach is commonly prescribed for maintenance immunosuppression to minimize single agent drug toxicities. Emphasis of this review is placed on key medication considerations including dosing, adverse effects, and drug interactions. Clinical considerations will be reviewed per drug class given available literature. Finally, acute cellular, antibody mediated, and chronic rejection are reviewed.
Collapse
|
10
|
Kim S, Hosoya K, Fukayama N, Deguchi T, Okumura M. Safety and efficacy of a nonmyeloablative pretransplant conditioning regimen using total lymphoid irradiation with volumetric modulated arc therapy in healthy dogs: A pilot study. Vet Med Sci 2021; 7:1120-1130. [PMID: 33713574 PMCID: PMC8294366 DOI: 10.1002/vms3.470] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/07/2020] [Revised: 01/15/2021] [Accepted: 02/22/2021] [Indexed: 12/22/2022] Open
Abstract
Allogeneic hematopoietic cell transplantation (HCT) has been an effective treatment for human patients with haematological malignancies (Baron & Storb, 2006; Bair et al., 2020; Copelan et al., 2019). However, the optimal pretransplant conditioning treatment is unclear in canine allogeneic HCT. This pilot study aimed to evaluate the safety and efficacy of total lymphoid irradiation (TLI) with volumetric modulated arc therapy (VMAT) for a nonmyeloablative HCT conditioning. Six healthy dogs were treated with 8 or 12 Gy TLI using VMAT. Haematological and physical changes were recorded over 8 weeks. To assess the effect of peripheral lymphocyte condition, lymphocyte subset and proliferative ability were examined. At the end of the experiment, necropsy was performed. All dogs showed mild‐to‐moderate neutropenia and thrombocytopenia, and these haematological changes resolved spontaneously. One dog treated with 8 Gy TLI developed transient cutaneous infection. No major complication was seen in the other seven dogs. Myelocytes and erythroblast cytopenia of bone marrow were detected in two dogs treated with 12 Gy TLI. This study is the first report of TLI using VMAT in dogs, and results suggest that this regimen is a feasible nonmyeloablative treatment.
Collapse
Affiliation(s)
- Sangho Kim
- Laboratory of Veterinary Surgery, Graduate School of Veterinary Medicine, Hokkaido University, Sapporo, Japan
| | - Kenji Hosoya
- Laboratory of Advanced Veterinary Medicine, Graduate School of Veterinary Medicine, Hokkaido University, Sapporo, Japan
| | - Natsuki Fukayama
- Laboratory of Advanced Veterinary Medicine, Graduate School of Veterinary Medicine, Hokkaido University, Sapporo, Japan
| | - Tatsuya Deguchi
- Graduate School of Veterinary Medicine, Veterinary Teaching Hospital, Hokkaido University, Sapporo, Japan
| | - Masahiro Okumura
- Laboratory of Veterinary Surgery, Graduate School of Veterinary Medicine, Hokkaido University, Sapporo, Japan
| |
Collapse
|
11
|
Arjuna A, Olson MT, Walia R, Bremner RM, Smith MA, Mohanakumar T. An update on current treatment strategies for managing bronchiolitis obliterans syndrome after lung transplantation. Expert Rev Respir Med 2020; 15:339-350. [PMID: 33054424 DOI: 10.1080/17476348.2021.1835475] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
INTRODUCTION Bronchiolitis obliterans syndrome (BOS), a subtype of chronic lung allograft dysfunction, is quite common, with up to half of all lung recipients developing BOS within 5 years of transplantation. Preventive efforts are aimed at alleviating known risk factors of BOS development, while the primary goal of treatment is to delay the irreversible, fibrotic airway changes, and progressive loss of lung function. AREAS COVERED This narrative review will briefly discuss the updated definition, clinical presentation, pathogenesis, risk factors, and survival after BOS while paying particular attention to the salient evidence for optimal preventive strategies and treatments based on investigations in the modern era. EXPERT OPINION Future translational research focused on further characterizing the complex interplay between immune and nonimmune mechanisms mediating chronic lung rejection is the first step toward mitigating risk of allograft injury, improving early disease detection with noninvasive biomarkers, and ultimately, developing an effective, targeted therapy that can extend the life of the lung allograft.
Collapse
Affiliation(s)
- Ashwini Arjuna
- St. Joseph's Hospital and Medical Center, Norton Thoracic Institute, Phoenix, AZ, USA
| | - Michael T Olson
- St. Joseph's Hospital and Medical Center, Norton Thoracic Institute, Phoenix, AZ, USA.,Phoenix Campus, University of Arizona College of Medicine, Phoenix, AZ, USA
| | - Rajat Walia
- St. Joseph's Hospital and Medical Center, Norton Thoracic Institute, Phoenix, AZ, USA
| | - Ross M Bremner
- St. Joseph's Hospital and Medical Center, Norton Thoracic Institute, Phoenix, AZ, USA
| | - Michael A Smith
- St. Joseph's Hospital and Medical Center, Norton Thoracic Institute, Phoenix, AZ, USA
| | | |
Collapse
|
12
|
|