Evaluation of CAF22 After Renal Transplantation

The safety and scientific validity of this study is the responsibility of the study sponsor and investigators. Listing a study does not mean it has been evaluated by the U.S. Federal Government. Know the risks and potential benefits of clinical studies and talk to your health care provider before participating. Read our disclaimer for details. Identifier: NCT02346968
Recruitment Status : Recruiting
First Posted : January 27, 2015
Last Update Posted : October 25, 2017
Information provided by (Responsible Party):
University Hospital Inselspital, Berne

Brief Summary:

Established markers of kidney function, such as creatinine, have considerable limitations in the diagnosis of delayed graft function (DGF) after kidney transplantation (KT). Indeed, creatinine does not accurately reflect minor changes of renal function as its levels change only upon significant fluctuations of the latter. CAF22 is a molecule which arises from the degradation of a larger protein and it is proposed to be a reliable and more sensitive marker of renal function. This study aims to further clarify this issue by measuring blood and urine concentrations of CAF22 and comparing them with creatinine levels before and after KT.

The main assumption is that blood CAF22 levels could serve as a more sensitive kidney function biomarker than creatinine post-KT to detect DGF.

Condition or disease Intervention/treatment
Kidney Transplantation Delayed Graft Function Other: Blood and urine sampling

Detailed Description:


Kidney transplantation (KT) is the most appropriate therapy of end stage renal disease (ESRD). While the number of kidney donors remained stable during the last decade the number of patients waiting for a kidney transplantation are rapidly increasing resulting in utilization of an increasing numbers of marginal renal transplants. These kidneys show a relatively high percentage of delayed graft function (DGF), which complicates post-transplant management and increases both the duration of initial hospitalization and the cost of transplantation.

Exact measurement of glomerular filtration rate (GFR) is complex in the clinical setting and thus GFR is usually estimated from serum creatinine levels through creatinine-based equations such as the MDRD or the CKD-EPI equations. Particularly, this is the case in kidney recipients with DGF, in whom creatinine levels remain high and they have to undergo dialysis. Creatinine is dialyzable, so that it cannot reflect the actual renal function in this setting due to fluctuations of its levels. Thus there is emergent need for a more accurate renal biomarker.

CAF22 is the C-terminal 22 kDa domain of agrin. Agrin is cleaved by its specific protease neurotrypsin at two distinct sites, whereas cleavage at the beta site generates a 22 kDa C-terminal fragment (CAF22). In the kidney agrin is part of the basal lamina, where it is the major contributor of the anionic potential of the glomerular basement membrane (GBM). There are indices for a proteolytic activity selectively shedding the C-terminal part of agrin of the GBM. Recently, a 19-fold increase of CAF22 levels in ESDR was observed, which was reduced in patients receiving KT, qualifying CAF22 as effective renal function marker. Additionally, current data support that CAF22 levels are not influenced by inflammatory processes, steroids or by hemodialysis with a standard dialysis membrane.



- to compare CAF22 versus creatinine as biomarkers for DGF prediction in patients undergoing kidney transplantation


  • to evaluate the kinetics of CAF levels related with the graft function outcomes "immediate graft function (IGF)" and "delayed graft function (DGF)"
  • to elucidate whether CAF can make estimations on the required hemodialysis days of patients with delayed graft function


Research project with humans associated with the collection of biologic material and health-related data. Prospective, observational trial.

All patients will be screened consecutively before undergoing kidney transplantation (KT).

All participants will undergo blood and urine sampling for estimation of CAF22 levels once before KT, once daily during the first 7 days after KT as well as at 2, 4 and 12 weeks after KT. Blood and urine sampling for CAF22 will be performed during routine follow-up sampling.

Study Type : Observational
Estimated Enrollment : 60 participants
Observational Model: Cohort
Time Perspective: Prospective
Official Title: Evaluation of Serum and Urinary C-terminal Agrin Fragment-22 (CAF22) as Novel Renal Function Marker in Kidney Transplant Recipients - A Prospective Observational Study
Actual Study Start Date : October 8, 2014
Estimated Primary Completion Date : December 2018
Estimated Study Completion Date : December 2018

Resource links provided by the National Library of Medicine

Group/Cohort Intervention/treatment
All study participants
Patients with end stage renal disease (ESRD) planned to undergo kidney transplantation.
Other: Blood and urine sampling
Blood and urine sampling (in the context of routine sampling)

Primary Outcome Measures :
  1. Delayed graft function (DGF) defined as the requirement of dialysis within 7 days after transplantation [ Time Frame: 7 days ]

Secondary Outcome Measures :
  1. Immediate graft function (IGF) [ Time Frame: 7 days ]
  2. Need for hemodialysis [ Time Frame: 7 days ]
  3. Hemodialysis duration (in days) [ Time Frame: 7 days ]

Biospecimen Retention:   Samples Without DNA
Serum, urine

Information from the National Library of Medicine

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Ages Eligible for Study:   18 Years to 80 Years   (Adult, Older Adult)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   No
Sampling Method:   Non-Probability Sample
Study Population
Patients with end stage renal disease (ESRD) planned to undergo kindey transplantation in Bern University Hospital will be screened consecutively, informed and asked for written inform consent.

Inclusion Criteria:

  • Age ≥ 18 years old
  • Written informed consent
  • All patients planned to undergo kidney transplantation

Exclusion Criteria

  • Age <18 years old
  • Pregnancy
  • Other individuals especially in need of protection (according to the Swiss Academy of Medical Sciences)

Information from the National Library of Medicine

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 identifier (NCT number): NCT02346968

Department of Nephrology, University Hospital of Essen Recruiting
Essen, Germany, 45147
Contact: Ute Eisenberger, PD. Dr. med.    +49 201 72384781   
Principal Investigator: Ute Eisenberger, PD. Dr. med.         
Dep. of Nephrology, Bern University Hospital Recruiting
Bern, Switzerland, 3010 Bern
Contact: Spyridon Arampatzis, MD    +41 (0)31 632 31 44   
Sponsors and Collaborators
University Hospital Inselspital, Berne
Principal Investigator: Spyridon Arampatzis, MD Dep. of Nephrology, Hypertension and Clinical Pharmacology, Bern University Hospital, Bern, Switzerland

Responsible Party: University Hospital Inselspital, Berne Identifier: NCT02346968     History of Changes
Other Study ID Numbers: 98/14
First Posted: January 27, 2015    Key Record Dates
Last Update Posted: October 25, 2017
Last Verified: October 2017

Keywords provided by University Hospital Inselspital, Berne:
Kidney Transplantation
Delayed Graft Function
C-terminal fragment of agrin

Additional relevant MeSH terms:
Delayed Graft Function
Pathologic Processes