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Clazakizumab for the Treatment of Chronic Active Antibody Mediated Rejection in Kidney Transplant Recipients (IMAGINE)

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: NCT03744910
Recruitment Status : Recruiting
First Posted : November 19, 2018
Last Update Posted : March 3, 2022
ICON Clinical Research
Information provided by (Responsible Party):
CSL Behring

Brief Summary:
This trial investigates the efficacy and safety of clazakizumab [an anti-interleukin (IL)-6 monoclonal antibody (mAb)] for the treatment of CABMR in recipients of a kidney transplant.

Condition or disease Intervention/treatment Phase
Antibody-mediated Rejection Biological: Clazakizumab Drug: Physiologic saline solution Phase 3

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Study Type : Interventional  (Clinical Trial)
Estimated Enrollment : 350 participants
Allocation: Randomized
Intervention Model: Parallel Assignment
Masking: Quadruple (Participant, Care Provider, Investigator, Outcomes Assessor)
Primary Purpose: Treatment
Official Title: A Pivotal Phase 3 Trial to Evaluate the Safety and Efficacy of Clazakizumab for the Treatment of Chronic Active Antibody-mediated Rejection in Kidney Transplant Recipients
Actual Study Start Date : October 14, 2019
Estimated Primary Completion Date : June 2028
Estimated Study Completion Date : November 2028

Resource links provided by the National Library of Medicine

Arm Intervention/treatment
Active Comparator: Clazakizumab
Clazakizumab is a genetically engineered humanized immunoglobulin G1 (IgG1) mAb that binds to human IL-6 that is administered subcutaneously.
Biological: Clazakizumab
Clazakizumab is a genetically engineered humanized immunoglobulin G1 (IgG1) mAb that binds to human IL-6

Placebo Comparator: Placebo
Physiologic saline solution that is administered subcutaneously.
Drug: Physiologic saline solution
Normal saline

Primary Outcome Measures :
  1. Time to all-cause composite allograft loss [ Time Frame: Up to 5.5 years ]
    Defined as return to dialysis, allograft nephrectomy, re-transplantation, eGFR < 15 mL/min/1.73 m2 or death from any cause [including death with functioning allograft]). An eGFR < 15 mL/min/1.73 m2 must be confirmed by a repeat measurement taken between 14 to 30 days later. Temporary return to dialysis due to AKI and temporary eGFR decline to < 15 mL/min/1.73 m2 due to AKI are both excluded.

Secondary Outcome Measures :
  1. Incidence and time to death-censored allograft loss [ Time Frame: Up to 5.5 years ]
  2. Change in mean estimated glomerular filtration rate (eGFR) from Baseline to End of Treatment (EOT) [ Time Frame: Baseline and Up to 5 years ]
  3. Change in spot urine albumin creatinine ratio (UACR) from Baseline to EOT [ Time Frame: Baseline and Up to 5 years ]
  4. Change in (Donor-specific antibodies) DSA titers and Mean fluorescence intensity (MFI) scores from Baseline to EOT [ Time Frame: Baseline and Up to 5 years ]
  5. Incidence of acute rejection episodes of T cell-mediated rejection(TCMR) and Antibody-mediated rejection (ABMR) from Baseline to EOT [ Time Frame: Baseline and Up to 5 years ]
  6. Change in Banff lesion grading score (2015 criteria) of pre-treatment to post-treatment (Week 52) kidney biopsies [ Time Frame: Up to 52 weeks ]
  7. Overall patient survival [ Time Frame: Up to 5.5 years ]
  8. Maximum serum concentration (Cmax, Cmax ss) of CSL300 [ Time Frame: Up to 21 days ]
  9. Trough serum concentrations (Ctrough, Ctrough ss) of CSL300 [ Time Frame: Up to 21 days ]
  10. Area under the concentration-time curve (AUC0-tau) at steady state of CSL300 [ Time Frame: Up to 21 days ]
  11. Time of maximum serum concentration (Tmax, Tmax ss) of CSL300 [ Time Frame: Up to 21 days ]

Information from the National Library of Medicine

Choosing to participate in a study is an important personal decision. Talk with your doctor and family members or friends about deciding to join a study. To learn more about this study, you or your doctor may contact the study research staff using the contacts provided below. For general information, Learn About Clinical Studies.

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Ages Eligible for Study:   18 Years to 70 Years   (Adult, Older Adult)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   No
  • Inclusion criteria:

    1. Age 18-70 years.
    2. Living donor/deceased donor kidney transplant recipients ≥6 months from time of transplant.
    3. Diagnosis of CABMR determined by kidney biopsy and the presence of HLA DSA using single-antigen bead-based assays.

      NOTE: If conducted within 6 months (+3 weeks) of the start of the screening period, the biopsy and DSA analysis do not need to be repeated at screening. To be considered for determination of study eligibility, the biopsy and DSA analysis must be performed at least 2 months ± 2 weeks after the end of any prior treatment for ABMR (including CABMR) or TCMR, in order to show continuing CABMR and presence of HLA DSA. In addition, treatments for ABMR or TCMR are not allowed within 3 months of the start of screening.

      The following histopathologic and serologic diagnostic criteria (based on Banff 2015 criteria [Loupy et al, 2017]) must be met for inclusion:

      • Morphologic evidence of chronic tissue injury, as demonstrated by TG (cg>0). Biopsies without evidence of chronic tissue injury on light microscopy, but with glomerular basement membrane double contours on electron microscopy (cg1a) are eligible.
      • Evidence of current/recent antibody interaction with vascular endothelium, including 1 or more of the following.
      • Linear C4d staining in peritubular capillaries or medullary vasa recta (C4d2 or C4d3 by immunofluorescence on frozen sections, or C4d > 0 by immunohistochemistry on paraffin sections).
      • At least moderate microvascular inflammation ([g + ptc] ≥ 2) in the absence of recurrent or de novo glomerulonephritis, although in the presence of acute TCMR, borderline infiltrate, or infection, ptc ≥ 2 alone is not sufficient and g must be ≥ 1.

      NOTE: The local pathologist's diagnosis must be reviewed by a central pathologist to confirm eligibility for entry into the study. Biopsies with other histopathologic changes (eg, BKV nephropathy or recurrent glomerulonephritis) may be eligible if concurrent CABMR changes (as detailed above) are present and determined to be the predominant cause of renal dysfunction.

    4. Serologic evidence of circulating DSA to HLA. NOTE: The local laboratory DSA results must be reviewed and confirmed by the central HLA reviewer during the screening period.
  • Exclusion criteria:

    1. Multi-organ transplant recipient (except for simultaneous kidney-pancreas or previous multiple kidney transplants) or cell transplant (islet, bone marrow, stem cell) recipient.
    2. Treatment for ABMR (including CABMR) or TCMR within 3 months of the start of screening.
    3. Received T cell depleting agents (e.g., alemtuzumab, anti-thymocyte globulin) within 3 months of the start of screening.
    4. Pregnant, breastfeeding, or unwillingness to practice adequate contraception.
    5. History of active tuberculosis (TB).
    6. History of human immunodeficiency virus (HIV) infection or positive for HIV.
    7. Seropositive for hepatitis B surface antigen (HBsAg)
    8. Hepatitis C virus (HCV) RNA positive.

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): NCT03744910

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Contact: Trial Registration Coordinator 610-878-4000

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Sponsors and Collaborators
CSL Behring
ICON Clinical Research
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Study Director: Study Director CSL Behring
Publications automatically indexed to this study by Identifier (NCT Number):
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Responsible Party: CSL Behring Identifier: NCT03744910    
Other Study ID Numbers: CSL300_3001
2018-003682-34 ( EudraCT Number )
VKTX01 ( Other Identifier: Vitaeris )
First Posted: November 19, 2018    Key Record Dates
Last Update Posted: March 3, 2022
Last Verified: March 2022

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Studies a U.S. FDA-regulated Drug Product: Yes
Studies a U.S. FDA-regulated Device Product: No
Keywords provided by CSL Behring:
Chronic Active
Antibody-mediated Rejection (AMR)