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Clinical Epidemiology
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Death after Kidney Transplantation: An Analysis by Era and Time Post-Transplant

Tracey Ying, Bree Shi, Patrick J. Kelly, Helen Pilmore, Philip A. Clayton and Steven J. Chadban
JASN December 2020, 31 (12) 2887-2899; DOI: https://doi.org/10.1681/ASN.2020050566
Tracey Ying
1Renal Medicine, Kidney Centre, Royal Prince Alfred Hospital, Camperdown, Australia
2Kidney Node, Charles Perkins Centre, The University of Sydney, Sydney, Australia
3Australia and New Zealand Dialysis and Transplant (ANZDATA) Registry, South Australian Health and Medical Research Institute, Adelaide, Australia
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Bree Shi
1Renal Medicine, Kidney Centre, Royal Prince Alfred Hospital, Camperdown, Australia
2Kidney Node, Charles Perkins Centre, The University of Sydney, Sydney, Australia
3Australia and New Zealand Dialysis and Transplant (ANZDATA) Registry, South Australian Health and Medical Research Institute, Adelaide, Australia
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Patrick J. Kelly
4School of Public Health, The University of Sydney, Sydney, Australia
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Helen Pilmore
5Renal Department, Auckland City Hospital, Auckland, New Zealand
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Philip A. Clayton
1Renal Medicine, Kidney Centre, Royal Prince Alfred Hospital, Camperdown, Australia
2Kidney Node, Charles Perkins Centre, The University of Sydney, Sydney, Australia
3Australia and New Zealand Dialysis and Transplant (ANZDATA) Registry, South Australian Health and Medical Research Institute, Adelaide, Australia
6Central Northern Adelaide Renal and Transplantation Service, Royal Adelaide Hospital, Adelaide, Australia
7Adelaide Medical School, University of Adelaide, Adelaide, Australia
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Steven J. Chadban
1Renal Medicine, Kidney Centre, Royal Prince Alfred Hospital, Camperdown, Australia
2Kidney Node, Charles Perkins Centre, The University of Sydney, Sydney, Australia
3Australia and New Zealand Dialysis and Transplant (ANZDATA) Registry, South Australian Health and Medical Research Institute, Adelaide, Australia
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Significance Statement

Given that the annual number of kidney transplants and the number of recipients living with a kidney transplant continue to rise, a contemporary assessment of trends in post-transplant mortality is urgently required. The authors’ analyses show that, despite changes in recipient profiles that confer increased risks of mortality, risks of death progressively declined over the past 40 years at all time points after transplantation, including after graft failure. Incidences of death from cardiovascular disease, cancer, and infection have all declined. Relatively greater reductions in cardiovascular death mean that cancer deaths now match cardiovascular deaths beyond the first post-transplant year in those with a functioning graft. This indicates that clinicians should focus on preventing death from cardiovascular disease and infections early post-transplant, and cancer and cardiovascular disease at later time points.

Abstract

Background Mortality risk after kidney transplantation can vary significantly during the post-transplant course. A contemporary assessment of trends in all-cause and cause-specific mortality at different periods post-transplant is required to better inform patients, clinicians, researchers, and policy makers.

Methods We included all first kidney-only transplant recipients from 1980 through 2018 from the Australia and New Zealand Dialysis and Transplant Registry. We compared adjusted death rates per 5-year intervals, using a piecewise exponential survival model, stratified by time post-transplant or time post–graft failure.

Results Of 23,210 recipients, 4765 died with a functioning graft. Risk of death declined over successive eras, at all periods post-transplant. Reductions in early deaths were most marked; however, recipients ≥10 years post-transplant were 20% less likely to die in the current era compared with preceding eras (2015–2018 versus 2005–2009, adjusted hazard ratio, 0.80; 95% confidence interval, 0.69 to 0.90). In 2015–2018, cardiovascular disease was the most common cause of death, particularly in months 0–3 post-transplant (1.18 per 100 patient-years). Cancer deaths were rare early post-transplant, but frequent at later time points (0.93 per 100 patient-years ≥10 years post-transplant). Among 3657 patients with first graft loss, 2472 died and were not retransplanted. Death was common in the first year after graft failure, and the cause was most commonly cardiovascular (50%).

Conclusions Reductions in death early and late post-transplant over the past 40 years represent a major achievement. Reductions in cause-specific mortality at all time points post-transplant are also apparent. However, relatively greater reductions in cardiovascular death have increased the prominence of late cancer deaths.

  • mortality
  • kidney transplantation
  • cardiovascular disease
  • cancer
  • epidemiology and outcomes
  • Copyright © 2020 by the American Society of Nephrology
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Journal of the American Society of Nephrology: 31 (12)
Journal of the American Society of Nephrology
Vol. 31, Issue 12
December 2020
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Death after Kidney Transplantation: An Analysis by Era and Time Post-Transplant
Tracey Ying, Bree Shi, Patrick J. Kelly, Helen Pilmore, Philip A. Clayton, Steven J. Chadban
JASN Dec 2020, 31 (12) 2887-2899; DOI: 10.1681/ASN.2020050566

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Death after Kidney Transplantation: An Analysis by Era and Time Post-Transplant
Tracey Ying, Bree Shi, Patrick J. Kelly, Helen Pilmore, Philip A. Clayton, Steven J. Chadban
JASN Dec 2020, 31 (12) 2887-2899; DOI: 10.1681/ASN.2020050566
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