A Cohort Study of Operationally Tolerant Allograft Recipients (ALLTOL)
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|ClinicalTrials.gov Identifier: NCT02743793|
Recruitment Status : Terminated (COVID-19 pandemic and potential risks to study participants and study staff.)
First Posted : April 19, 2016
Results First Posted : September 21, 2021
Last Update Posted : September 21, 2021
Antirejection medicines, also known as immunosuppressive drugs, are prescribed to organ transplant recipients to prevent their bodies from rejecting the new organ. Some organ transplant recipients can stop taking anti-rejection medicines without rejecting their transplanted organ (this is called 'tolerance'). The purpose of this study will collect samples and data from 'tolerant' liver or kidney transplant recipients in order to find out:
The purpose of this study is to collect samples and data in order to find out:
- How long liver or kidney transplant recipients can remain tolerant;
- What happens in the tolerant recipient's body over time; and
- If there are patterns in the body that are linked to tolerance.
|Condition or disease||Intervention/treatment|
|Kidney Transplant Liver Transplant||Procedure: Blood Draw|
This is a multi-center, prospective, observational study in which operationally tolerant recipients of liver or kidney allografts will be followed longitudinally, with annual collections of clinical data and biological samples. All participants will be followed for the duration of the study, regardless of changes in their tolerance status.
Participants will be recruited by three main pathways:
- Tolerant participants from current and past Immune Tolerance Network (ITN) trials, including those who have already completed trial participation and those who are anticipated to complete trial participation,
- Tolerant participants referred by ITN affiliated investigators, academic and community transplant physicians and directly through outreach to transplant affinity groups such as the National Kidney Foundation (NKF), and
- Tolerant participants from the general transplant community who are reachable through general contact channels such as the ITN website, word-of-mouth referrals from existing participants, and social media.
|Study Type :||Observational|
|Actual Enrollment :||41 participants|
|Official Title:||A Prospective Cohort Study of Operationally Tolerant Allograft Recipients (ITN063ST)|
|Actual Study Start Date :||June 30, 2016|
|Actual Primary Completion Date :||March 24, 2020|
|Actual Study Completion Date :||March 24, 2020|
Operationally Tolerant Kidney or Liver Allograft Recipients
Operational tolerance at baseline is defined as:
Procedure: Blood Draw
- Time to Loss of Operational Tolerance [ Time Frame: From operational tolerance to ITN063ST study completion, assessed up to 60 months ]A participant is considered to have operational tolerance if they are off all immunosuppression medication while continuing to have stable allograft function and no rejection. For these participants, the date of operational tolerance is considered as 52 weeks from the participant's last documented dose of immunosuppression. A participant will be considered to have lost operational tolerance if they experience rejection, have loss of stable allograft function (in the absence of confounding factors), or restart immunosuppression. The endpoint was analyzed using Kaplan-Meier survival estimate and associated two-sided 95% confidence interval, using a delayed-entry model with left-truncation of survival times by censoring the time from achieving operational tolerance at the time of study enrollment. The survival estimate is at the time of the last of event.
- Time to Development of Anti-Human Leukocyte Antigen (HLA) Antibody or Donor Specific Antibodies (DSA) [ Time Frame: Day 0 (Study Enrollment) to Study Completion (Up to 3.7 years) ]
Time to development of either:
- de novo HLA antibodies (anti-HLA Ab) post-transplant. Alloantibody is defined as an antibody produced following the introduction of an alloantigen into the system of an individual lacking that particular antigen; OR
- Donor Specific Antibodies (DSA), a newly developed alloantibody that is against the donor organ.
Alloantibodies are important mediators of acute and chronic rejection.
**These data are not yet available.**
- Number of Participants With Biopsy-Proven or Clinical Acute Rejection, Steroid Resistant Rejection and/or Chronic Rejection [ Time Frame: Day 0 (Study Enrollment) to Study Completion (Up to 3.7 years) ]
Number of participants with acute rejection, steroid resistant rejection and/or chronic rejection.
Criteria employed for acute and chronic rejection: Banff guidelines.
- Number of Participants With Graft Loss, Not Including Death With a Functioning Graft [ Time Frame: Day 0 (Study Enrollment) to Study Completion (Up to 3.7 years) ]A participant is considered to have graft loss when the participant is retransplanted with another donor kidney, relisted for transplantation, or dies with a non-functioning graft.
Biospecimen Retention: Samples With DNA
To learn more about this study, you or your doctor may contact the study research staff using the contact information provided by the sponsor.
Please refer to this study by its ClinicalTrials.gov identifier (NCT number): NCT02743793
|United States, California|
|University of California, San Francisco|
|San Francisco, California, United States, 94143|
|United States, Georgia|
|Emory University School of Medicine|
|Atlanta, Georgia, United States, 30324|
|United States, Illinois|
|Ann & Robert H. Lurie Children's Memorial Hospital of Chicago|
|Chicago, Illinois, United States, 60611|
|United States, Pennsylvania|
|University of Pennsylvania Medical Center|
|Philadelphia, Pennsylvania, United States, 19104|
|Children's Hospital of Pittsburg of UPMC|
|Pittsburgh, Pennsylvania, United States, 15224|
|Study Chair:||Sindhu Chandran, M.D.||Immune Tolerance Network (ITN)|