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Alvarez A, Montgomery A, Galván NTN, Brewer ED, Rana A. Predicting wait time for pediatric kidney transplant: a novel index. Pediatr Nephrol 2024; 39:2483-2493. [PMID: 38216782 PMCID: PMC11199301 DOI: 10.1007/s00467-023-06232-1] [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: 05/28/2023] [Revised: 11/06/2023] [Accepted: 11/07/2023] [Indexed: 01/14/2024]
Abstract
BACKGROUND Over one thousand pediatric kidney transplant candidates are added to the waitlist annually, yet the prospective time spent waiting is unknown for many. Our study fills this gap by identifying variables that impact waitlist time and by creating an index to predict the likelihood of a pediatric candidate receiving a transplant within 1 year of listing. This index could be used to guide patient management by giving clinicians a potential timeline for each candidate's listing based on a unique combination of risk factors. METHODS A retrospective analysis of 3757 pediatric kidney transplant candidates from the 2014 to 2020 OPTN/UNOS database was performed. The data was randomly divided into a training set, comprising two-thirds of the data, and a testing set, comprising one-third of the data. From the training set, univariable and multivariable logistic regressions were used to identify significant predictive factors affecting wait times. A predictive index was created using variables significant in the multivariable analysis. The index's ability to predict likelihood of transplantation within 1 year of listing was validated using ROC analysis on the training set. Validation of the index using ROC analysis was repeated on the testing set. RESULTS A total of 10 variables were found to be significant. The five most significant variables include the following: blood group, B (OR 0.65); dialysis status (OR 3.67); kidney disease etiology, SLE (OR 0.38); and OPTN region, 5 (OR 0.54) and 6 (OR 0.46). ROC analysis of the index on the training set yielded a c-statistic of 0.71. ROC analysis of the index on the testing set yielded a c-statistic of 0.68. CONCLUSIONS This index is a modest prognostic model to assess time to pediatric kidney transplantation. It is intended as a supplementary tool to guide patient management by providing clinicians with an individualized prospective timeline for each candidate. Early identification of candidates with potential for prolonged waiting times may help encourage more living donation including paired donation chains.
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Affiliation(s)
- Alexandra Alvarez
- Office of Student Affairs, Baylor College of Medicine, 1 Baylor Plaza, Houston, TX, 77030, USA.
| | - Ashley Montgomery
- Office of Student Affairs, Baylor College of Medicine, 1 Baylor Plaza, Houston, TX, 77030, USA
| | - Nhu Thao Nguyen Galván
- Division of Abdominal Transplantation, Michael E. DeBakey Department of Surgery, Baylor College of Medicine, Houston, TX, USA
| | - Eileen D Brewer
- Division of Pediatric Nephrology, Department of Pediatrics, Baylor College of Medicine, Houston, TX, USA
| | - Abbas Rana
- Division of Abdominal Transplantation, Michael E. DeBakey Department of Surgery, Baylor College of Medicine, Houston, TX, USA
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2
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Verbesey J, Thomas AG, Waterman AD, Karhadkar S, Cassell VR, Segev DL, Hogan J, Cooper M. Unrecognized opportunities: The landscape of pediatric kidney-paired donation in the United States. Pediatr Transplant 2024; 28:e14657. [PMID: 38317337 PMCID: PMC10857737 DOI: 10.1111/petr.14657] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/07/2023] [Revised: 10/31/2023] [Accepted: 11/13/2023] [Indexed: 02/07/2024]
Abstract
BACKGROUND Pediatric (age < 18 years) kidney transplant (KT) candidates face increasingly complex choices. The 2014 kidney allocation system nearly doubled wait times for pediatric recipients. Given longer wait times and new ways to optimize compatibility, more pediatric candidates may consider kidney-paired donation (KPD). Motivated by this shift and the potential impact of innovations in KPD practice, we studied pediatric KPD procedures in the US from 2008 to 2021. METHODS We describe the characteristics and outcomes of pediatric KPD recipients with comparison to pediatric non-KPD living donor kidney transplants (LDKT), pediatric LDKT recipients, and pediatric deceased donor (DDKT) recipients. RESULTS Our study cohort includes 4987 pediatric DDKTs, 3447 pediatric non-KPD LDKTs, and 258 pediatric KPD transplants. Fewer centers conducted at least one pediatric KPD procedure compared to those that conducted at least one pediatric LDKT or DDKT procedure (67, 136, and 155 centers, respectively). Five centers performed 31% of the pediatric KPD transplants. After adjustment, there were no differences in graft failure or mortality comparing KPD recipients to non-KPD LDKT, LDKT, or DDKT recipients. DISCUSSION We did not observe differences in transplant outcomes comparing pediatric KPD recipients to controls. Considering these results, KPD may be underutilized for pediatric recipients. Pediatric KT centers should consider including KPD in KT candidate education. Further research will be necessary to develop tools that could aid clinicians and families considering the time horizon for future KT procedures, candidate disease and histocompatibility characteristics, and other factors including logistics and donor protections.
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Affiliation(s)
| | - Alvin G Thomas
- Department of Epidemiology, University of North Carolina, Chapel Hill, North Carolina, USA
- Department of Surgery, New York University Langone Health, New York, New York, USA
| | - Amy D Waterman
- Department of Surgery, Houston Methodist, Houston, Texas, USA
| | - Sunil Karhadkar
- Department of Surgery, Temple University Hospital, Philadelphia, Pennsylvania, USA
| | | | - Dorry L Segev
- Department of Surgery, New York University Langone Health, New York, New York, USA
- Scientific Registry of Transplant Recipients, Minneapolis, Minnesota, USA
| | - Julien Hogan
- Université Paris Cité, INSERM, UMR-S970, PARCC, Paris Translational Research Center for Organ Transplantation, Paris, France
- Pediatric Nephrology Department, Robert Debré Hospital, APHP, Paris, France
| | - Matt Cooper
- Department of Surgery, Medical College of Wisconsin, Milwaukee, Wisconsin, USA
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3
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Zhang Q, Su X, Liu L, Huang M, Wu W, Zhang H, Wu C, Fu Q, Gao P, Ling L, Chen W, Xu B, Liao Y, Li J, Wang C. The Outcome of Transplanting Kidneys From Very Small Pediatric Deceased Donors. Transplantation 2023; 107:1564-1572. [PMID: 36788440 DOI: 10.1097/tp.0000000000004534] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/16/2023]
Abstract
BACKGROUND Kidneys from very small pediatric donors (VSPDs, aged <2 y) are underutilized. Concerns regarding potentially inferior outcomes hinder the use in pediatric recipients. METHODS All pediatric kidney-only transplants from <18-year-old donors between January 2012 and May 2021 in our center were included in this study. Outcomes were compared between VSPD and normal pediatric donor (NPD, aged 2-18 y) groups, and 3-y death-censored graft survival was assessed by the multivariable Cox proportional hazard model. RESULTS Of all 252 enrolled patients, 149 (59.1%) received kidneys from NPDs and 103 (40.9%) from VSPDs. The 3-y graft survival rates of the NPD and VSPD groups were 91.2% and 88.6%, respectively ( P = 0.385). The adjusted hazard ratio of 3-y graft loss was 1.2 (95% confidence interval, 0.6-2.5; P = 0.659) for the VSPD group compared with the NPD group. There was no significant difference in estimated glomerular filtration rate at 3 y posttransplant observed between NPD and VSPD groups (86.9 ± 26.8 versus 87 ± 27.9 mL/min/1.73 m 2 ; P = 0.991). Patients (n = 12, 4.8%) who received kidneys from donors <5 kg contributed 5 (5/39, 12.8%) with delayed graft function and the sole primary nonfunction in our cohort. CONCLUSIONS Although attention to preventing complications is necessary, especially for kidneys from donors <5 kg, kidneys from VSPDs did not appear to impart added risk for 3-y graft loss and renal function.
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Affiliation(s)
- Qiang Zhang
- Organ Transplant Center, The First Affiliated Hospital, Sun Yat-sen University, Guangzhou, China
| | - Xiaojun Su
- Organ Transplant Center, The First Affiliated Hospital, Sun Yat-sen University, Guangzhou, China
| | - Longshan Liu
- Organ Transplant Center, The First Affiliated Hospital, Sun Yat-sen University, Guangzhou, China
| | - Mingchuan Huang
- Organ Transplant Center, The First Affiliated Hospital, Sun Yat-sen University, Guangzhou, China
| | - Wenrui Wu
- Organ Transplant Center, The First Affiliated Hospital, Sun Yat-sen University, Guangzhou, China
| | - Huanxi Zhang
- Organ Transplant Center, The First Affiliated Hospital, Sun Yat-sen University, Guangzhou, China
| | - Chenglin Wu
- Organ Transplant Center, The First Affiliated Hospital, Sun Yat-sen University, Guangzhou, China
| | - Qian Fu
- Organ Transplant Center, The First Affiliated Hospital, Sun Yat-sen University, Guangzhou, China
| | - Pengfei Gao
- Organ Transplant Center, The First Affiliated Hospital, Sun Yat-sen University, Guangzhou, China
| | - Liuting Ling
- Organ Transplant Center, The First Affiliated Hospital, Sun Yat-sen University, Guangzhou, China
| | - Wenting Chen
- Organ Transplant Center, The First Affiliated Hospital, Sun Yat-sen University, Guangzhou, China
| | - Bowen Xu
- Organ Transplant Center, The First Affiliated Hospital, Sun Yat-sen University, Guangzhou, China
| | - Yuan Liao
- Organ Transplant Center, The First Affiliated Hospital, Sun Yat-sen University, Guangzhou, China
| | - Jun Li
- Organ Transplant Center, The First Affiliated Hospital, Sun Yat-sen University, Guangzhou, China
| | - Changxi Wang
- Organ Transplant Center, The First Affiliated Hospital, Sun Yat-sen University, Guangzhou, China
- Guangdong Provincial Key Laboratory of Organ Donation and Transplant Immunology, Guangzhou, China
- Guangdong Provincial Key Laboratory Guangdong Provincial International Cooperation Base of Science and Technology (Organ Transplantation), Guangzhou, China
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Kim JJ, Curtis RMK, Reynolds B, Marks S, Drage M, Kosmoliaptsis V, Dudley J, Williams A. The UK kidney donor risk index poorly predicts long-term transplant survival in paediatric kidney transplant recipients. Front Immunol 2023; 14:1207145. [PMID: 37334377 PMCID: PMC10275486 DOI: 10.3389/fimmu.2023.1207145] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/17/2023] [Accepted: 05/16/2023] [Indexed: 06/20/2023] Open
Abstract
Background The UK kidney offering scheme introduced a kidney donor risk index (UK-KDRI) to improve the utility of deceased-donor kidney allocations. The UK-KDRI was derived using adult donor and recipient data. We assessed this in a paediatric cohort from the UK transplant registry. Methods We performed Cox survival analysis on first kidney-only deceased brain-dead transplants in paediatric (<18 years) recipients from 2000-2014. The primary outcome was death-censored allograft survival >30 days post-transplant. The main study variable was UK-KDRI derived from seven donor risk-factors, categorised into four groups (D1-low risk, D2, D3 and D4-highest risk). Follow-up ended on 31-December-2021. Results 319/908 patients experienced transplant loss with rejection as the main cause (55%). The majority of paediatric patients received donors from D1 donors (64%). There was an increase in D2-4 donors during the study period, whilst the level of HLA mismatching improved. The KDRI was not associated with allograft failure. In multi-variate analysis, increasing recipient age [adjusted HR and 95%CI: 1.05(1.03-1.08) per-year, p<0.001], recipient minority ethnic group [1.28(1.01-1.63), p<0.05), dialysis before transplant [1.38(1.04-1.81), p<0.005], donor height [0.99 (0.98-1.00) per centimetre, p<0.05] and level of HLA mismatch [Level 3: 1.92(1.19-3.11); Level 4: 2.40(1.26-4.58) versus Level 1, p<0.01] were associated with worse outcomes. Patients with Level 1 and 2 HLA mismatches (0 DR +0/1 B mismatch) had median graft survival >17 years regardless of UK-KDRI groups. Increasing donor age was marginally associated with worse allograft survival [1.01 (1.00-1.01) per year, p=0.05]. Summary Adult donor risk scores were not associated with long-term allograft survival in paediatric patients. The level of HLA mismatch had the most profound effect on survival. Risk models based on adult data alone may not have the same validity for paediatric patients and therefore all age-groups should be included in future risk prediction models.
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Affiliation(s)
- Jon Jin Kim
- Department of Surgery, University of Cambridge, Cambridge, United Kingdom
- Department of Paediatric Nephrology, Nottingham University Hospitals, Nottingham, United Kingdom
| | - Rebecca M. K. Curtis
- Statistics and Clinical Research, NHS Blood and Transplant, Bristol, United Kingdom
| | - Ben Reynolds
- Department of Paediatric Nephrology, Royal Hospital for Children, Glasgow, United Kingdom
| | - Stephen D. Marks
- Department of Paediatric Nephrology, Great Ormond Street Hospital for Children NHS Foundation Trust, London, United Kingdom
- NIHR Great Ormond Street Hospital Biomedical Research Centre, University College London Great Ormond Street Institute of Child Health, London, United Kingdom
| | - Martin Drage
- Department of Paediatric Nephrology, Great Ormond Street Hospital for Children NHS Foundation Trust, London, United Kingdom
| | - Vasilis Kosmoliaptsis
- Department of Surgery, University of Cambridge, Cambridge, United Kingdom
- NIHR Blood and Transplant Research Unit in Organ Donation and Transplantation, University of Cambridge, Cambridge, United Kingdom
| | - Jan Dudley
- Department of Paediatric Nephrology, Bristol Children’s Hospital, Bristol, United Kingdom
| | - Alun Williams
- Department of Paediatric Nephrology, Nottingham University Hospitals, Nottingham, United Kingdom
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Charnaya O, Zeiser L, Yisar D, Goldberg A, Segev DL, Massie A, Garonzik-Wang J, Verghese P. The unfinished journey toward transplant equity: an analysis of racial/ethnic disparities for children after the implementation of the Kidney Allocation System in 2014. Pediatr Nephrol 2023; 38:1275-1289. [PMID: 35816202 PMCID: PMC10848995 DOI: 10.1007/s00467-022-05676-1] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/02/2022] [Revised: 06/24/2022] [Accepted: 06/27/2022] [Indexed: 11/29/2022]
Abstract
BACKGROUND Disparities in pediatric kidney transplantation (KT) result in reduced access and worse outcomes for minority children. We assessed the impact of recent systems changes on these disparities. METHODS This is a retrospective cohort study of pediatric patients utilizing data from the US Renal Data System (n = 7547) and Scientific Registry of Transplant Recipients (n = 6567 waitlisted and n = 6848 transplanted patients). We compared access to transplantation, time to deceased donor kidney transplant (DDKT), and allograft failure (ACGF) in the 5 years preceding implementation of the Kidney Allocation System (KAS) to the 5 years post-KAS implementation 2010-2014 vs. 2015-2019, respectively. RESULTS Compared to the pre-KAS era, post-KAS candidates were more likely to be pre-emptively listed (26.8% vs. 38.1%, p < 0.001), pre-emptively transplanted (23.8% vs. 28.0%, p < 0.001), and less likely to have private insurance (35.6% vs. 32.3%, p = 0.01), but these were not uniform across racial groups. Compared to white children, Black and Hispanic children had a lower likelihood of transplant listing within 2 years of first dialysis service (aHR 0.590.670.76 and 0.730.820.92, respectively) in the post-KAS era. Time to DDKT was comparable across all racial groups in the post-KAS era. Compared to white children, Black DDKT recipients have more 5-year ACGF (aHR 1.001.432.06 p = 0.05) while there was no difference in 3- or 5-year ACGF among LDKT recipients. CONCLUSIONS After KAS implementation, there is equity in time to DDKT. Pre-KAS increased hazard of ACGF among Black children has decreased in the post-KAS era; however, persistent disparities exist in time to transplant listing among Black and Hispanic children when compared to white children. A higher resolution version of the Graphical abstract is available as Supplementary information.
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Affiliation(s)
- Olga Charnaya
- Department of Pediatrics, Johns Hopkins University School of Medicine, Baltimore, MD, USA.
| | - Laura Zeiser
- Department of Surgery, School of Medicine and Public Health, University of Wisconsin, Madison, WI, USA
| | - Dolev Yisar
- Medical School for International Health, Ben-Gurion University of the Negev, Be-er Sheva, Israel
| | - Aviva Goldberg
- Department of Pediatric Nephrology, University of Manitoba, Winnipeg, Canada
| | - Dorry L Segev
- Department of Surgery, School of Medicine and Public Health, University of Wisconsin, Madison, WI, USA
- Department of Epidemiology, Johns Hopkins School of Public Health, Baltimore, MD, USA
- Scientific Registry of Transplant Recipients, Minneapolis, MN, USA
| | - Allan Massie
- Department of Surgery, School of Medicine and Public Health, University of Wisconsin, Madison, WI, USA
| | - Jacqueline Garonzik-Wang
- Department of Surgery, School of Medicine and Public Health, University of Wisconsin, Madison, WI, USA
| | - Priya Verghese
- Department of Pediatrics, Ann & Robert H. Lurie Children's Hospital, Northwestern University, Chicago, IL, USA
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6
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Transplant access for children: there is more to be done. Pediatr Nephrol 2023; 38:941-944. [PMID: 36369300 DOI: 10.1007/s00467-022-05787-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/08/2022] [Revised: 10/13/2022] [Accepted: 10/13/2022] [Indexed: 11/13/2022]
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7
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Montgomery A, Goff C, Adeyeri B, Ferreira LD, Kamepalli S, Lynn J, Galvan NTN, Srivaths PR, Brewer ED, Rana A. A modified Kidney Donor Risk Index for pediatric kidney transplant recipients. Pediatr Nephrol 2023; 38:1309-1317. [PMID: 36066770 DOI: 10.1007/s00467-022-05722-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/17/2022] [Revised: 08/08/2022] [Accepted: 08/08/2022] [Indexed: 11/29/2022]
Abstract
BACKGROUND The Kidney Donor Risk Index (KDRI) by Rao et al. was developed to measure the quality of kidney allografts. While Rao's KDRI has been found to be a robust measure of kidney allograft survival for adult kidney transplant recipients, many studies have indicated the need to create a distinct pediatric KDRI. METHODS Our retrospective study utilized data from the United Network for Organ Sharing database. We examined 9295 deceased donor recipients' data for age < 18 years from 1990 to 2020. We performed a multivariate Cox regression to determine the significant recipient and transplant factors impacting pediatric kidney allograft survival. RESULTS Multivariate analysis found 5 donor factors to be independently associated with graft failure or recipient death: age, female sex, anoxia as the cause of death, history of cigarette use, and cold ischemia time. Using receiver operator characteristic (ROC) curve analysis and analyzing the predictive value of each KDRI at 1, 5, and 10 years, the proposed pediatric KDRI had a statistically significant and higher predictive value for pediatric recipients at 5 (0.60 versus 0.57) and 10 years (0.61 versus 0.57) than the Rao KDRI. CONCLUSIONS The proposed pediatric KDRI may provide a more accurate and simpler index to assess the quality of kidney allografts for pediatric recipients. However, due to the mild increase in predictive capabilities over the Rao index, the study serves as a proof of concept to develop a pediatric KDRI. Further studies should focus on increasing the index's predictive capabilities. A higher resolution version of the Graphical abstract is available as Supplementary information.
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Affiliation(s)
- Ashley Montgomery
- Department of Student Affairs, Baylor College of Medicine, Houston, TX, USA.
| | - Cameron Goff
- Department of Student Affairs, Baylor College of Medicine, Houston, TX, USA
| | - Bolatito Adeyeri
- Department of Student Affairs, Baylor College of Medicine, Houston, TX, USA
| | - Liam D Ferreira
- Department of Student Affairs, Baylor College of Medicine, Houston, TX, USA
| | - Spoorthi Kamepalli
- Department of Student Affairs, Baylor College of Medicine, Houston, TX, USA
| | - Jake Lynn
- Department of Student Affairs, Baylor College of Medicine, Houston, TX, USA
| | - Nhu Thao Nguyen Galvan
- Division of Abdominal Transplant, Michael E DeBakey Department of Surgery, Baylor College of Medicine, Houston, TX, USA
| | | | - Eileen D Brewer
- Renal Section, Department of Pediatrics, Baylor College of Medicine, Houston, TX, USA
| | - Abbas Rana
- Division of Abdominal Transplant, Michael E DeBakey Department of Surgery, Baylor College of Medicine, Houston, TX, USA
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8
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Engen RM, Smith JM, Bartosh SM. The kidney allocation system and pediatric transplantation at 5 years. Pediatr Transplant 2022; 26:e14369. [PMID: 35919967 DOI: 10.1111/petr.14369] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/01/2022] [Revised: 07/07/2022] [Accepted: 07/17/2022] [Indexed: 11/26/2022]
Abstract
BACKGROUND A new Kidney Allocation System (KAS) was implemented in the United States in 2014 with the goal of improving equity and utility. METHODS In this study, we compare outcomes for kidney-alone candidates less than 18 years of age, at the time of listing, in the 5 years prior to and following policy implementation using Organ Procurement and Transplantation Network data. RESULTS While the pediatric deceased donor transplant rate increased under KAS, this increase was due solely to improved access for children aged 11-17 years; there was an 18.9% decrease in the deceased donor transplant rate among children 0-5 years old, from 117.94 to 95.8 transplants per 100 person-years (p = .001). The cumulative incidence of deceased donor transplantation by 1 year after listing decreased from 39.3% in the pre-KAS era to 35.5% in the post-KAS era (p = .004), a decline that was driven entirely by longer wait times for children 0-5 years old (p = .017). Candidates with a calculated panel reactive antibody of 98%-100% experienced a significant increase in transplant rate, but there was no change in transplant rate for Black or Hispanic candidates. CONCLUSION Overall, KAS increased transplantation access for teenaged and highly sensitized candidates but resulted in decreased access for the youngest children with no improvement in racial/ethnic equality.
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Affiliation(s)
- Rachel M Engen
- Department of Pediatrics, University of Wisconsin Madison, Madison, Wisconsin, USA
| | - Jodi M Smith
- Department of Pediatrics, University of Washington, Seattle, Washington, USA
| | - Sharon M Bartosh
- Department of Pediatrics, University of Wisconsin Madison, Madison, Wisconsin, USA
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Husain SA, King KL, Owen-Simon NL, Fernandez HE, Ratner LE, Mohan S. Access to kidney transplantation among pediatric candidates with prior solid organ transplants in the United States. Pediatr Transplant 2022; 26:e14303. [PMID: 35615911 PMCID: PMC9378581 DOI: 10.1111/petr.14303] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/19/2021] [Revised: 03/30/2022] [Accepted: 04/24/2022] [Indexed: 11/26/2022]
Abstract
BACKGROUND Pediatric kidney transplant candidates require timely access to transplant to optimize growth and neurodevelopmental outcomes. We studied access to transplant for pediatric candidates with prior organ transplants. METHODS We used US registry data to identify pediatric kidney transplant candidates added to the waiting list 2015-2019 and used competing risk regression to study the association between prior transplant status and probability of receiving a kidney transplant, treating wait-list removal and death as competing events. RESULTS Of 4962 pediatric kidney transplant candidates included, 89% had no prior transplant and 11% had received a prior organ transplant (kidney 87%, liver 5%, heart 5%). Prior transplant recipients were older at listing (median 15 vs. 12 years) and more likely to have PRA≥98% (22% vs. 0.3%) (both p < .001). There was no significant difference in the proportion of candidates from each group who were preemptively wait-listed. Unadjusted competing risk regression showed a lower risk of kidney transplant after wait-listing among candidates with prior organ transplant (HR 0.52, 95%CI 0.47-0.59, p < .001). This association remained significant after adjusting for candidate characteristics (HR 0.73, 95%CI 0.63-0.83, p < .001). Among deceased donor kidney recipients, median KDPI was similar between groups, but recipients with prior transplants were more likely to receive kidneys from donors with hypertension (4% vs. 1%, p = .01) and donors after cardiac death (11% vs. 4%, p < .001). CONCLUSIONS Pediatric kidney transplant candidates with prior organ transplants have reduced access to transplant after wait-listing. Allocation system changes are needed to improve timely access to transplant for this vulnerable group.
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Affiliation(s)
- S. Ali Husain
- Department of Medicine, Division of Nephrology, Columbia University College of Physicians & Surgeons, New York, NY
- The Columbia University Renal Epidemiology (CURE) Group, New York, NY
| | - Kristen L. King
- Department of Medicine, Division of Nephrology, Columbia University College of Physicians & Surgeons, New York, NY
- The Columbia University Renal Epidemiology (CURE) Group, New York, NY
| | - Nina L. Owen-Simon
- Department of Surgery, Columbia University College of Physicians & Surgeons, New York, New York
| | - Hilda E. Fernandez
- Department of Medicine, Division of Nephrology, Columbia University College of Physicians & Surgeons, New York, NY
- Department of Pediatrics, Division of Nephrology, Columbia University College of Physicians & Surgeons, New York, NY
| | - Lloyd E. Ratner
- Department of Surgery, Columbia University College of Physicians & Surgeons, New York, New York
| | - Sumit Mohan
- Department of Medicine, Division of Nephrology, Columbia University College of Physicians & Surgeons, New York, NY
- The Columbia University Renal Epidemiology (CURE) Group, New York, NY
- Department of Epidemiology, Mailman School of Public Health, Columbia University, New York, NY
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10
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Nie W, Su X, Liu L, Li J, Fu Q, Li X, Wu C, Wang J, Deng R, Chen E, Yang S, Li S, Zhang H, Wang C. Dynamics of Donor-Derived Cell-Free DNA at the Early Phase After Pediatric Kidney Transplantation: A Prospective Cohort Study. Front Med (Lausanne) 2022; 8:814517. [PMID: 35071284 PMCID: PMC8777035 DOI: 10.3389/fmed.2021.814517] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/13/2021] [Accepted: 12/07/2021] [Indexed: 11/13/2022] Open
Abstract
Background: Donor-derived cell-free DNA (ddcfDNA) has been suggested as an indicator of allograft injury in adult and pediatric kidney transplantation (KTx). However, the dynamics of ddcfDNA in pediatric KTx have not been investigated. In addition, it has not been demonstrated whether donor-recipient (D/R) size mismatch affect ddcfDNA level. Methods: Pediatric KTx recipients with a single donor kidney were enrolled and followed up for 1 year. ddcfDNA, calculated as a fraction (%) in the recipient plasma, was examined longitudinally within 3 months post-transplant. D/R size mismatch degree was described as D/R height ratio. The 33rd percentile of D/R height ratio (0.70) was used as the cut-off to divide the patients into low donor-recipient height ratio group (<0.70) and high donor-recipient height ratio group (≥0.70). The dynamics of ddcfDNA were analyzed and the impact factors were explored. Stable ddcfDNA was defined as the first lowest ddcfDNA. ddcfDNA flare-up was defined as a remarkable elevation by a proportion of >30% from stable value with a peak value >1% during elevation. Results: Twenty-one clinically stable recipients were enrolled. The median D/R height ratio was 0.83 (0.62–0.88). It took a median of 8 days for ddcfDNA to drop from day 1 and reach a stable value of 0.67% (0.46–0.73%). Nevertheless, 61.5% patients presented ddcfDNA>1% at day 30. Besides, 81.0% (17/21) of patients experienced elevated ddcfDNA and 47.6% (10/21) met the standard of ddcfDNA flare-up. Donor-recipient height ratio was an independent risk factor for ddcfDNA flare-up (odds ratio = 0.469 per 0.1, 95% CI 0.237–0.925, p = 0.029) and low donor-recipient height ratio (<0.70) was found to increase the risk of flare-up occurrence (odds ratio = 15.00, 95% CI 1.342–167.638, p = 0.028). Conclusions: ddcfDNA rebounds in many stable pediatric KTx recipients without rejection. This may be induced by significant D/R size mismatch and may affect its diagnostic performance at the early phase after pediatric KTx in children.
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Affiliation(s)
- Weijian Nie
- Organ Transplant Center, The First Affiliated Hospital, Sun Yat-sen University, Guangzhou, China
| | - Xiaojun Su
- Organ Transplant Center, The First Affiliated Hospital, Sun Yat-sen University, Guangzhou, China
| | - Longshan Liu
- Organ Transplant Center, The First Affiliated Hospital, Sun Yat-sen University, Guangzhou, China.,Guangdong Provincial Key Laboratory on Organ Donation and Transplant Immunology, Guangzhou, China.,Guangdong Provincial International Cooperation Base of Science and Technology (Organ Transplantation), Guangzhou, China
| | - Jun Li
- Organ Transplant Center, The First Affiliated Hospital, Sun Yat-sen University, Guangzhou, China
| | - Qian Fu
- Organ Transplant Center, The First Affiliated Hospital, Sun Yat-sen University, Guangzhou, China
| | - Xirui Li
- Organ Transplant Center, The First Affiliated Hospital, Sun Yat-sen University, Guangzhou, China
| | - Chenglin Wu
- Organ Transplant Center, The First Affiliated Hospital, Sun Yat-sen University, Guangzhou, China
| | - Jiali Wang
- Department of Nephrology, The First Affiliated Hospital, Sun Yat-sen University, Guangzhou, China
| | - Ronghai Deng
- Organ Transplant Center, The First Affiliated Hospital, Sun Yat-sen University, Guangzhou, China
| | - E Chen
- Organ Transplant Center, The First Affiliated Hospital, Sun Yat-sen University, Guangzhou, China
| | - Shicong Yang
- Department of Pathology, The First Affiliated Hospital, Sun Yat-sen University, Guangzhou, China
| | - Shujuan Li
- Department of Cardiovascular Pediatrics, The First Affiliated Hospital, Sun Yat-sen University, Guangzhou, China
| | - Huanxi Zhang
- Organ Transplant Center, The First Affiliated Hospital, Sun Yat-sen University, Guangzhou, China
| | - Changxi Wang
- Organ Transplant Center, The First Affiliated Hospital, Sun Yat-sen University, Guangzhou, China.,Guangdong Provincial Key Laboratory on Organ Donation and Transplant Immunology, Guangzhou, China.,Guangdong Provincial International Cooperation Base of Science and Technology (Organ Transplantation), Guangzhou, China
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11
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Fruh K, Duman EK. Offering more without offering compensation: non-compensating benefits for living kidney donors. MEDICINE, HEALTH CARE, AND PHILOSOPHY 2021; 24:711-719. [PMID: 34165674 DOI: 10.1007/s11019-021-10034-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Accepted: 06/19/2021] [Indexed: 06/13/2023]
Abstract
While different positions on the permissibility of organ markets enjoy support, there is widespread agreement that some benefits to living organ donors are acceptable and do not raise the same moral concerns associated with organ markets, such as exploitation and commodification. We argue on the basis of two distinctions that some benefit packages offered to donors can defensibly surpass conventional reimbursement while stopping short of controversial cash payouts. The first distinction is between benefits that defray the costs of donating an organ and benefits that incentivize donation by offering something in excess of defraying. The second distinction is between benefits that compensate donors and benefits that are non-compensating. We argue that non-compensating benefits are innocent of moral concerns typically associated with controversial cash payouts, and thus may be a morally promising avenue for increasing rates of kidney donation to address the tragic results of undersupply.
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Affiliation(s)
- Kyle Fruh
- Duke Kunshan University, Kunshan, China.
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12
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Krissberg JR, Kaufmann MB, Gupta A, Bendavid E, Stedman M, Cheng XS, Tan JC, Grimm PC, Chaudhuri A. Racial Disparities in Pediatric Kidney Transplantation under the New Kidney Allocation System in the United States. Clin J Am Soc Nephrol 2021; 16:1862-1871. [PMID: 34670797 PMCID: PMC8729489 DOI: 10.2215/cjn.06740521] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2021] [Revised: 09/14/2021] [Accepted: 09/27/2021] [Indexed: 01/14/2023]
Abstract
BACKGROUND AND OBJECTIVES In December 2014, the Kidney Allocation System (KAS) was implemented to improve equity in access to transplantation, but preliminary studies in children show mixed results. Thus, we aimed to assess how the 2014 KAS policy change affected racial and ethnic disparities in pediatric kidney transplantation access and related outcomes. DESIGN, SETTING, PARTICIPANTS, & MEASUREMENTS We performed a retrospective cohort study of children <18 years of age active on the kidney transplant list from 2008 to 2019 using the Scientific Registry of Transplant Recipients. Log-logistic accelerated failure time models were used to determine the time from first activation on the transplant list and the time on dialysis to deceased donor transplant, each with KAS era or race and ethnicity as the exposure of interest. We used logistic regression to assess odds of delayed graft function. Log-rank tests assessed time to graft loss within racial and ethnic groups across KAS eras. RESULTS All children experienced longer wait times from activation to transplantation post-KAS. In univariable analysis, Black and Hispanic children and other children of color experienced longer times from activation to transplant compared with White children in both eras; this finding was largely attenuated after multivariable analysis (time ratio, 1.16; 95% confidence interval, 1.01 to 1.32; time ratio, 1.13; 95% confidence interval, 1.00 to 1.28; and time ratio, 1.17; 95% confidence interval, 0.96 to 1.41 post-KAS, respectively). Multivariable analysis also showed that racial and ethnic disparities in time from dialysis initiation to transplantation in the pre-KAS era were mitigated in the post-KAS era. There were no disparities in odds of delayed graft function. Black and Hispanic children experienced longer times with a functioning graft in the post-KAS era. CONCLUSIONS No racial and ethnic disparities from activation to deceased donor transplantation were seen before or after implementation of the KAS in multivariable analysis, whereas time on dialysis to transplantation and odds of short-term graft loss improved in equity after the implementation of the KAS, without compromising disparities in delayed graft function. PODCAST This article contains a podcast at https://www.asn-online.org/media/podcast/CJASN/2021_12_07_CJN06740521.mp3.
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Affiliation(s)
- Jill R. Krissberg
- Department of Pediatrics, Division of Nephrology, Northwestern University Feinberg School of Medicine, Chicago, Illinois,Department of Nephrology, Ann & Robert H. Lurie Children’s Hospital, Chicago, Illinois
| | - Matthew B. Kaufmann
- Stanford Health Policy, Centers for Health Policy and Primary Care and Outcomes Research, Department of Medicine, Stanford University School of Medicine, Stanford, California
| | - Anshal Gupta
- Department of Medicine, Stanford University School of Medicine, Stanford, California
| | - Eran Bendavid
- Stanford Health Policy, Centers for Health Policy and Primary Care and Outcomes Research, Department of Medicine, Stanford University School of Medicine, Stanford, California
| | - Margaret Stedman
- Department of Medicine, Stanford University School of Medicine, Stanford, California
| | - Xingxing S. Cheng
- Department of Medicine, Stanford University School of Medicine, Stanford, California
| | - Jane C. Tan
- Department of Medicine, Stanford University School of Medicine, Stanford, California
| | - Paul C. Grimm
- Department of Pediatrics, Division of Nephrology, Stanford University School of Medicine, Stanford, California
| | - Abanti Chaudhuri
- Department of Pediatrics, Division of Nephrology, Stanford University School of Medicine, Stanford, California
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13
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Glorioso JM. Kidney Allocation Policy: Past, Present, and Future. Adv Chronic Kidney Dis 2021; 28:511-516. [PMID: 35367019 DOI: 10.1053/j.ackd.2022.01.006] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2021] [Revised: 01/17/2022] [Accepted: 01/20/2022] [Indexed: 12/13/2022]
Abstract
Despite an increase in the number of kidney transplants performed annually, there remain more than 90,000 individuals awaiting transplantation in the United States. As kidney transplantation has evolved, so has kidney allocation policies. The Kidney Allocation System, which was introduced in 2014, made significant strides to improve utility and equity, but regional and geographic disparities remain. Further modifications eliminating donor service areas have been introduced. Moving forward, systems involving continuous distribution and artificial intelligence may provide further advancement toward an ideal allocation system.
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14
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Sypek MP, Davies CE, Le Page AK, Clayton P, Hughes PD, Larkins N, Wong G, Kausman JY, Mackie F. Paediatric deceased donor kidney transplant in Australia: A 30-year review-What have paediatric bonuses achieved and where to from here? Pediatr Transplant 2021; 25:e14019. [PMID: 33942949 DOI: 10.1111/petr.14019] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/11/2020] [Revised: 11/21/2020] [Accepted: 12/14/2020] [Indexed: 02/01/2023]
Abstract
BACKGROUND In this 30-year national review, we describe trends in DD transplantation for paediatric recipients, assess the impact of paediatric allocation bonuses and identify outstanding areas of need for this population. METHODS A retrospective review of all DD kidney only transplants to paediatric recipients (<18 years old) in Australia between 1989 and 2018 was conducted using deidentified extracts from the ANZDATA. RESULTS Of the 1011 kidney only transplants performed in paediatric recipients during the study period, 426 (42%) were from deceased donors. Paediatric candidates on the DD waiting list had consistently higher rates of transplantation and shorter time from dialysis initiation to transplantation compared with adult candidates (median 372 vs 832 days in 2018, for example). Donor characteristics remained more favourable for paediatric recipients, despite a decline in the overall quality of the donor pool. The mean number of HLA antigen mismatches for paediatric recipients of DD transplants increased each decade (2.86 [1989-1998], 3.85 [1999-2008], 4.01 [2009-2018]). Both patient and graft survival have improved for paediatric DD transplant recipients in the most recent era (5-year graft and patient survival 85% vs 65% and 99% vs 94%, respectively, for 2009-2018 vs 1999-2008). CONCLUSIONS The current DD kidney allocation system in Australia provides rapid access to high-quality organs for paediatric recipients, and early graft loss has decreased significantly in recent years; however, additional targeted interventions to address HLA matching may improve long-term outcomes in this population.
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Affiliation(s)
- Matthew P Sypek
- Faculty of Medicine, Dentistry and Health Science, University of Melbourne, Melbourne, Vic, Australia.,Department of Nephrology, Royal Melbourne Hospital, Melbourne, Vic, Australia.,Department of Nephrology, Royal Children's Hospital, Melbourne, Vic, Australia.,Australia and New Zealand Dialysis and Transplant (ANZDATA) Registry, South Australian Health and Medical Research Institute, Adelaide, SA, Australia
| | - Christopher E Davies
- Australia and New Zealand Dialysis and Transplant (ANZDATA) Registry, South Australian Health and Medical Research Institute, Adelaide, SA, Australia.,Adelaide Medical School, University of Adelaide, Adelaide, SA, Australia
| | - Amelia K Le Page
- Department of Nephrology, Monash Children's Hospital, Clayton, Vic, Australia
| | - Philip Clayton
- Australia and New Zealand Dialysis and Transplant (ANZDATA) Registry, South Australian Health and Medical Research Institute, Adelaide, SA, Australia.,Adelaide Medical School, University of Adelaide, Adelaide, SA, Australia.,Central and Northern Adelaide Transplant Service, Royal Adelaide Hospital, Adelaide, SA, Australia
| | - Peter D Hughes
- Faculty of Medicine, Dentistry and Health Science, University of Melbourne, Melbourne, Vic, Australia.,Department of Nephrology, Royal Melbourne Hospital, Melbourne, Vic, Australia
| | - Nicholas Larkins
- Faculty of Health and Medical Sciences, Paediatrics, The University of Western Australia, Perth, WA, Australia
| | - Germaine Wong
- School of Public Health, The University of Sydney, Sydney, NSW, Australia.,Centre for Kidney Research, The Children's Hospital at Westmead, Westmead, NSW, Australia
| | - Joshua Y Kausman
- Faculty of Medicine, Dentistry and Health Science, University of Melbourne, Melbourne, Vic, Australia.,Department of Nephrology, Royal Children's Hospital, Melbourne, Vic, Australia
| | - Fiona Mackie
- Department of Nephrology, Sydney Children's Hospital, Randwick, NSW, Australia.,School of Women's and Child Health, U.N.S.W., Sydney, NSW, Australia
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15
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Jackson KR, Bowring MG, Kernodle A, Boyarsky B, Desai N, Charnaya O, Garonzik-Wang J, Massie AB, Segev DL. Changes in offer and acceptance patterns for pediatric kidney transplant candidates under the new Kidney Allocation System. Am J Transplant 2020; 20:2234-2242. [PMID: 32012451 PMCID: PMC8555691 DOI: 10.1111/ajt.15799] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/04/2019] [Revised: 01/26/2020] [Accepted: 01/28/2020] [Indexed: 01/25/2023]
Abstract
Stakeholders have expressed concerns regarding decreased deceased donor kidney transplant (DDKT) rates for pediatric candidates under the Kidney Allocation System (KAS). To better understand what might be driving this, we studied Scientific Registry of Transplant Recipients kidney offer data for 3642 pediatric (age <18 years) kidney-only transplant candidates between December 31, 2012 to December 3, 2014 (pre-KAS) and December 4, 2014 to January 6, 2017 (post-KAS). We used negative binomial regression and multilevel logistic regression to compare offer and acceptance rates pre- and post-KAS. We stratified by donor age (<18, 18-34, and 35+ years) and KDPI (<35% and ≥35%) to reflect differing allocation prioritization pre-KAS and post-KAS. As might be expected from prioritization changes, post-KAS candidates were less likely to receive offers for donors 18-34 years old with KDPI ≥ 35% (adjusted incidence rate ratio [aIRR]: 0.18 0.210.25 , P < .001), and more likely to receive offers for donors 18-34 years old and KDPI < 35% (aIRR: 1.12 1.201.29 , P < .001). However, offer acceptance practices also changed post-KAS: kidneys from donors 18-34 years old and KDPI < 35% were 23% less likely to be accepted post-KAS (adjusted odds ratio: 0.61 0.770.98 , P = .03). Using kidneys from donors 18-34 years old with KDPI < 35% post-KAS to the same extent they were used pre-KAS might be an effective strategy to mitigate any decrease in DDKT rates for pediatric candidates.
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Affiliation(s)
- Kyle R. Jackson
- Department of Surgery, Johns Hopkins University School of Medicine, Baltimore, Maryland
| | - Mary G. Bowring
- Department of Surgery, Johns Hopkins University School of Medicine, Baltimore, Maryland
| | - Amber Kernodle
- Department of Surgery, Johns Hopkins University School of Medicine, Baltimore, Maryland
| | - Brian Boyarsky
- Department of Surgery, Johns Hopkins University School of Medicine, Baltimore, Maryland
| | - Niraj Desai
- Department of Surgery, Johns Hopkins University School of Medicine, Baltimore, Maryland
| | - Olga Charnaya
- Department of Pediatrics, Johns Hopkins University School of Medicine, Baltimore, Maryland
| | | | - Allan B. Massie
- Department of Surgery, Johns Hopkins University School of Medicine, Baltimore, Maryland
| | - Dorry L. Segev
- Department of Surgery, Johns Hopkins University School of Medicine, Baltimore, Maryland
- Department of Epidemiology, Johns Hopkins School of Public Health, Baltimore, Maryland
- Scientific Registry of Transplant Recipients, Minneapolis, Minnesota
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16
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Utilisation of kidneys from deceased donors at increased risk of infectious disease transmission: a step in the right direction. Pediatr Nephrol 2020; 35:177-179. [PMID: 31667621 DOI: 10.1007/s00467-019-04380-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/24/2019] [Accepted: 07/24/2019] [Indexed: 10/25/2022]
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