An open-label, controlled, randomized Phase 3 trial evaluating 12-month kidney function in highly sensitized (cPRA ≥99.9%) kidney transplant patients with positive crossmatch against a deceased donor, comparing desensitization using imlifidase with standard of care



Eligible Ages
Between 18 Years and 70 Years
Eligible Genders
Accepts Healthy Volunteers

Inclusion Criteria

  • Signed Informed Consent obtained before any trial-related procedures - Male or female age 18-70 years at the time of screening - Chronic kidney disease (CKD) stage 5, highly sensitized as evaluated by standard selection criteria, and active on the OPTN waiting list for a DD kidney transplant - Original calculated panel reactive antibody (cPRA) ≥99.9% - Virtual crossmatch (vXM), predictive of a positive crossmatch to an available deceased donor (DD) - Willingness and ability to comply with the protocol - Willingness to participate in the planned 4-year extension trial

Exclusion Criteria

  • High dose IVIg (2 g/kg) treatment within 28 days prior to imlifidase treatment - Previous treatment with imlifidase - Breast feeding or pregnancy - Women of child-bearing potential not willing or able to practice FDA-approved forms of contraception, or abstinence. Two medically acceptable methods of highly effective contraception must be used for the duration of the study (e.g. oral, transdermal, intravaginal, injectable or implantable contraceptive; intrauterine device; intrauterine hormone-releasing system; vasectomized partner; bilateral tubal occlusion; or double barrier method). For a woman to be considered postmenopausal this ascertainment must be made according to medical records and clinical history and may be aided by measurement of elevated postmenopausal serum gonadotropin levels (FSH). - ABO blood group incompatible transplantations (A2 or A2B kidneys will not be accepted for B recipients) - Positive serology for human immunodeficiency virus (HIV) - Clinical signs of hepatitis B virus (HBV) or hepatitis C virus (HCV) infections - Clinical signs of cytomegalovirus (CMV) or Epstein-Barr virus (EBV) infections - Positive test for severe acute respiratory syndrome coronavirus-2 (SARS-CoV-2) (according to local hospital routines) - Active tuberculosis - Severe other conditions requiring treatment and close monitoring, e.g. cardiac failure ≥grade 4 (New York Heart Association), unstable coronary disease or oxygen dependent chronic obstructive pulmonary disease (COPD) - Any condition that in the view of the Investigator precludes transplantation - History of a proven hypercoagulable condition - Present or history of thrombotic thrombocytopenic purpura (TTP), or known familial history of TTP - Intake of investigational drugs within 5 half-lives of the drug or 3 months, whichever is the longest - Contemporaneous participation in a medical device study - Known mental incapacity or language barriers precluding adequate understanding of the Informed Consent information and the trial activities - Inability by the judgement of the investigator to participate in the trial for any other reason

Study Design

Phase 3
Study Type
Intervention Model
Parallel Assignment
Intervention Model Description
Open-label, controlled and randomized
Primary Purpose
None (Open Label)

Arm Groups

ArmDescriptionAssigned Intervention
Imlifidase, is provided as a freeze-dried powder for concentrate for solution for infusion, 11 mg per vial. After reconstitution with sterile water for injection, the concentrate contains 10 mg/mL imlifidase. Imlifidase is administered intravenously as one infusion of 0.25 mg/kg over 15 minutes generally 24 hours prior to transplantation. A second dose of 0.25 mg/kg may be given if the first imlifidase dose is considered not to have had sufficient effect.
  • Drug: Imlifidase
    Imlifidase is an immunoglobulin G (IgG)-degrading enzyme of Streptococcus pyogenes that is highly selective towards IgG. The cleavage of IgG generates one F(ab')2- and one homodimeric Fc-fragment and efficiently neutralizes Fc-mediated activities of IgG.
    Other names:
    • IdeS, HMED-IdeS
Best available treatment
Institution-specific desensitization protocol (i.e. any combination of plasma exchange (PLEX), intravenous IVIg, anti-CD20 antibody, and eculizumab) where appropriate OR remain on wait list for a more compatible organ offer
  • Procedure: PLEX
    PLEX is performed according to the respective site's standard procedure for desensitization.
    Other names:
    • Plasma exchange, PE
  • Drug: IVIg
    IVIg prepared from a pool of immunoglobulins from the plasma of thousands of healthy donors is administered in accordance with respective site's standard procedure for desensitization.
    Other names:
    • Intravenous immunoglobulin
  • Drug: Anti-CD20 antibodies
    Rituximab and other anti-CD20 according to the respective site's standard procedure for desensitization.
    Other names:
    • Rituximab
  • Drug: Eculizumab
    Eculizumab according to the respective site's standard procedure for desensitization.
    Other names:
    • Soliris
  • Other: Remain on wait list
    Remain on wait list for a more compatible organ offer if desentization with institutional protocol is not appropriate

Recruiting Locations

Georgetown Transplant Institute
Washington, District of Columbia 20007
Mathew Cooper, MD

More Details

Hansa Biopharma AB

Study Contact

Central Contact
+46 46 16 56 70

Detailed Description

After being informed about the study and potential risks, all patients giving written informed consent will undergo pre-screening to determine eligibility for study entry. Once an organ offer is received, a virtual crossmatch (vXM) is performed. If the crossmatch is considered predictive of a positive flow cytometry crossmatch (FCXM), the patient will be evaluated if eligible to receive the desensitization currently in use at the study site. Subsequently the patient will be randomized in a 1:1 ratio to the imlifidase or the control arm. If the patient is randomized to the imlifidase arm, the organ will be accepted and shipped, and the patient will proceed to imlifidase treatment (generally within 24 h prior to transplantation) followed by transplantation. If the patient is randomized to the control arm, transplantation made possible by the local desensitization regimen will occur. If the institution-specific desensitization protocol is deemed not to be successful, the organ offer will be turned down, and the patient will remain active on the waiting list and remain in the trial, while the kidney will be allocated to another recipient through the kidney allocation system (KAS). All transplanted patients will receive induction therapy and maintenance immunosuppression. All patients will be followed for 12 months. Estimated glomerular filtration rate (eGFR) will be assessed 12 months after randomization as the primary endpoint reasonably likely to predict a clinical benefit in patient survival. All patients with donor specific antibodies (DSA) are at risk of developing antibody-mediated rejection (AMR). Imlifidase removes DSA quickly and efficiently at the time of transplantation but, as with other desensitization methods, the antibodies are expected to re-occur after transplantation. In the imlifidase treatment arm, and for desensitized control arm patients, protocol kidney biopsies will be performed at the time of transplantation and at 1 year after transplantation.


Study information shown on this site is derived from ClinicalTrials.gov (a public registry operated by the National Institutes of Health). The listing of studies provided is not certain to be all studies for which you might be eligible. Furthermore, study eligibility requirements can be difficult to understand and may change over time, so it is wise to speak with your medical care provider and individual research study teams when making decisions related to participation.