Journal of Nephrology

, Volume 29, Issue 2, pp 269–276 | Cite as

Tacrolimus trough-level variability predicts long-term allograft survival following kidney transplantation

  • John A. O’Regan
  • Mark Canney
  • Dervla M. Connaughton
  • Patrick O’Kelly
  • Yvonne Williams
  • Geraldine Collier
  • Declan G. deFreitas
  • Conall M. O’Seaghdha
  • Peter J. Conlon
Original Article

Abstract

Aims

The purpose of this study is to investigate tacrolimus trough-level variability from 3 to 12 months following transplantation and its association with allograft survival in renal transplant recipients.

Materials and methods

In this observational cohort study, tacrolimus trough-level variability was used as the predictor of all-cause allograft failure (defined as return to dialysis) and patient survival (all-cause mortality).

Results

In total, 394 transplants were included in the analysis. Sixty-two transplants failed during the study. Tacrolimus trough-level variability across quartile groups were: Q1 median variability 12.5 %, range 4.76–15.71 % (n = 99), Q2 median variability 18.17 %, range 15.74–21.29 % (n = 96), Q3 median variability 24.63 % range 21.42–28.88 % (n = 100), Q4 median variability 36.91 %, range 28.91–81.9 % (n = 99). Higher tacrolimus trough-level variability was associated with inferior allograft survival in univariate models [hazard ratio per quartile increase (HR), 1.46, 95 % CI 1.16–1.83, p value = 0.001] and multivariate models (HR 1.36, 95 % CI 1.05–1.78, p value = 0.019). Higher tacrolimus trough-level variability was not associated with patient survival; univariate model (HR 1.25, 95 % CI 0.90–1.74, p value = 0.17), multivariate model (HR 1.25, 95 % CI 0.86–1.83, p value = 0.23).

Conclusions

Inferior renal allograft survival was observed in recipients with higher variability in tacrolimus trough-levels.

Keywords

Transplantation Tacrolimus Variability Kidney 

Notes

Compliance with ethical standards

Conflict of interest

The authors declare no conflict of interest.

Ethical approval

This study was a retrospective observational study using data from a prospectively gathered National Registry of Renal Transplant Recipients.

Informed consent

Particularly, patients or their personal medical record charts were not contacted as all data was retrieved from the transplant database as is, so informed consent was not sought.

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Copyright information

© Italian Society of Nephrology 2015

Authors and Affiliations

  • John A. O’Regan
    • 1
  • Mark Canney
    • 1
  • Dervla M. Connaughton
    • 1
  • Patrick O’Kelly
    • 1
  • Yvonne Williams
    • 1
  • Geraldine Collier
    • 2
  • Declan G. deFreitas
    • 1
  • Conall M. O’Seaghdha
    • 1
  • Peter J. Conlon
    • 1
  1. 1.Department of Nephrology and TransplantationBeaumont HospitalDublin 9Ireland
  2. 2.Renal Laboratory, Department of BiochemistryBeaumont HospitalDublin 9Ireland

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