Clinical trial NCT05985122: New Analytic Tools for aHUS and C3G Diagnosis
Official title: Towards the Most Accurate Diagnosis and Monitoring of Complement-mediated Rare Kidney Diseases
Study type: INTERVENTIONAL
Overall status: RECRUITING
Phase: NA
Conditions: Hemolytic-Uremic Syndrome
Membranoproliferative Glomerulonephritis
Healthy
Keywords: Complement-mediated kidney diseases
Blood and tissue biomarkers
Assay standardization
Glycocalyx
Characterization of variants of unknown significance
Lead sponsor: Mario Negri Institute for Pharmacological Research
Sponsor class: OTHER
First posted: 2023-08-14
Enrollment: 180
Sex: ALL
Standard ages: CHILD
ADULT
OLDER_ADULT
Accepts healthy volunteers: yes
Allocation: NON_RANDOMIZED
Intervention model: PARALLEL
Intervention model description: The samples (healthy volunteers and HUS or MPGN patients) for the study will be identified between those of patients and healthy controls who provided consent to store their samples in the certified biobank of "Centro Daccò" (Centro di Risorse Biologiche Mario Negri - Biobanca Malattie Rare e Renali) for two previousely approved studies.
Primary purpose: DIAGNOSTIC

Brief summary: This protocol is part of a larger project, COMPRare (COMPlement-mediated Rare kidney diseases), which has been financed on behalf of the EJP RD (European Joint Programme on Rare Diseases) program of EU and is leaded by a scientific consortium from 7 European countries.

The partners (P) of the consortium are:

P1. Radboudumc Amalia Children's Hospital (The Netherlands) P2. Semmelweis University (Hungary) P3. Cordeliers Research Center (France) P4. Max Delbruck Center for Molecular Medicine (Germany) P5. Istituto di Ricerche Farmacologiche Mario Negri (Italy) P6. Lund University (Sweden) P7. Lille University (France)

The general aim of the project is to define new diagnostic tools for complement activation in order to improve patients stratification and follow-up, thereby affecting time and choice of treatment in patients with aHUS and C3G.

Particularly, the specific objectives of the COMPRare are:

* To develop new standardized analytic assays thereby identifying specific complement prognostic biomarkers for early diagnosis, classification, improved monitoring and treatment of patients with aHUS and C3G;
* To in-depth characterize patients' complement abnormalities in blood, in patient-derived cells and in kidney biopsies;
* To identify strategies to classify VUS/LPV
* To find new pathophysiological pathways involved in aHUS and C3G for further improving disease diagnosis, monitoring and treatment.

The results of these studies will form the basis of personalized treatment with existing and upcoming complement inhibitory drugs for these rare complement-mediated kidney diseases.

Detailed description: Atypical Hemolytic Uremic Syndrome (aHUS) and C3 Glomerulopathies (C3G) are ultra-rare conditions in which an uncontrolled complement activation results in renal inflammation with thrombotic microangiopathy (TMA) in aHUS and extensive deposition of complement fragments in the kidneys in C3G. In both conditions, these alterations lead to acute and chronic kidney damage and, ultimately, end-stage renal failure. The prevalence of genetic and acquired complement abnormalities varies between the two diseases, but covers mostly the same complement proteins. Blocking the complement system is the treatment of choice in aHUS and may have considerable potential in C3G, as evident from the increasing number of phase 3 trials with complement inhibitory drugs. Timely and accurate diagnosis is still challenging for clinicians, both for aHUS, to differentiate it from other forms of TMA, and for C3G, to distinguish it from other forms of glomerulonephritis (GN). In C3G, kidney biopsy is the diagnostic gold standard but it is not sufficient. Therefore, for both aHUS and C3G, there is an unmet need for accurate testing of genetic and acquired complement abnormalities. Moreover, interlaboratory complement-assays, in particular the tests for the C3 Nephritic Factors (C3NeFs; heterogeneous autoantibodies that stabilize the C3 convertase), vary considerably and, consequently, their standardization is a great necessity. Furthermore, the interpretation of genetic results in aHUS and C3G is not always conclusive.

Variants of Unknown Significance (VUS)/Likely Pathogenic Variant (LPV) in complement genes are often found in aHUS and C3G and require further characterization. A rapid and functional VUS/LPV determination and interpretation could help to better understand the disease pathophysiology and might influence diagnosis and treatment options.

Currently, aHUS patients are effectively treated with the complement C5 inhibiting monoclonal antibodies Eculizumab and Ravulizumab. However, the duration and optimal dose of treatment are debated, particularly in view of the high costs of the drug. Even if recent studies showed that restrictive use of eculizumab is feasible, there is a clear need for biomarkers identification and protocols for monitoring and predicting disease activity in aHUS and C3G patients.

In summary, new analytic tools for further defining the disease profile in blood, (patients) cells and kidney biopsies are needed.

Eligibility criteria: Aim 1

Inclusion Criteria:

* Male and female patients (children and adults) with C3G diagnosis
* Biobank written informed consent

Aim 2 Inclusion criteria

* Male and female patients (children and adults) with aHUS diagnosis in acute phase (before any treatment), or in remission either untreated or undergoing anti-C5 treatment at standard dosing
* Written informed consent Exclusion criteria
* Stx-associated HUS
* TTP (ADAMTS13\<10%)
* Plasma therapy within 2 weeks from blood sampling

Primary outcomes:
measure: Determination of assay sensitivity and specificity
timeFrame: At day 0
Secondary outcomes:
Other outcomes:
Locations:
city: Ranica
country: Italy
facility: Centro di Ricerche Cliniche per le Malattie Rare "Aldo e Cele Daccò"
state: BG
Study officials:
affiliation: Istituto Di Ricerche Farmacologiche Mario Negri
name: Marina Noris, PhD
role: PRINCIPAL_INVESTIGATOR
References:
citation: Noris M, Galbusera M, Gastoldi S, Macor P, Banterla F, Bresin E, Tripodo C, Bettoni S, Donadelli R, Valoti E, Tedesco F, Amore A, Coppo R, Ruggenenti P, Gotti E, Remuzzi G. Dynamics of complement activation in aHUS and how to monitor eculizumab therapy. Blood. 2014 Sep 11;124(11):1715-26. doi: 10.1182/blood-2014-02-558296. Epub 2014 Jul 18.
citation: Iatropoulos P, Daina E, Curreri M, Piras R, Valoti E, Mele C, Bresin E, Gamba S, Alberti M, Breno M, Perna A, Bettoni S, Sabadini E, Murer L, Vivarelli M, Noris M, Remuzzi G; Registry of Membranoproliferative Glomerulonephritis/C3 Glomerulopathy; Nastasi. Cluster Analysis Identifies Distinct Pathogenetic Patterns in C3 Glomerulopathies/Immune Complex-Mediated Membranoproliferative GN. J Am Soc Nephrol. 2018 Jan;29(1):283-294. doi: 10.1681/ASN.2017030258. Epub 2017 Oct 13.
citation: Donadelli R, Pulieri P, Piras R, Iatropoulos P, Valoti E, Benigni A, Remuzzi G, Noris M. Unraveling the Molecular Mechanisms Underlying Complement Dysregulation by Nephritic Factors in C3G and IC-MPGN. Front Immunol. 2018 Oct 15;9:2329. doi: 10.3389/fimmu.2018.02329. eCollection 2018.
citation: Galbusera M, Noris M, Gastoldi S, Bresin E, Mele C, Breno M, Cuccarolo P, Alberti M, Valoti E, Piras R, Donadelli R, Vivarelli M, Murer L, Pecoraro C, Ferrari E, Perna A, Benigni A, Portalupi V, Remuzzi G. An Ex Vivo Test of Complement Activation on Endothelium for Individualized Eculizumab Therapy in Hemolytic Uremic Syndrome. Am J Kidney Dis. 2019 Jul;74(1):56-72. doi: 10.1053/j.ajkd.2018.11.012. Epub 2019 Mar 7.
citation: Piras R, Breno M, Valoti E, Alberti M, Iatropoulos P, Mele C, Bresin E, Donadelli R, Cuccarolo P, Smith RJH, Benigni A, Remuzzi G, Noris M. CFH and CFHR Copy Number Variations in C3 Glomerulopathy and Immune Complex-Mediated Membranoproliferative Glomerulonephritis. Front Genet. 2021 Jun 11;12:670727. doi: 10.3389/fgene.2021.670727. eCollection 2021.
citation: Aiello S, Gastoldi S, Galbusera M, Ruggenenti P, Portalupi V, Rota S, Rubis N, Liguori L, Conti S, Tironi M, Gamba S, Santarsiero D, Benigni A, Remuzzi G, Noris M. C5a and C5aR1 are key drivers of microvascular platelet aggregation in clinical entities spanning from aHUS to COVID-19. Blood Adv. 2022 Jan 8;6(3):866-881. doi: 10.1182/bloodadvances.2021005246.
citation: Piras R, Valoti E, Alberti M, Bresin E, Mele C, Breno M, Liguori L, Donadelli R, Rigoldi M, Benigni A, Remuzzi G, Noris M. CFH and CFHR structural variants in atypical Hemolytic Uremic Syndrome: Prevalence, genomic characterization and impact on outcome. Front Immunol. 2023 Jan 30;13:1011580. doi: 10.3389/fimmu.2022.1011580. eCollection 2022.
citation: Gastoldi S, Aiello S, Galbusera M, Breno M, Alberti M, Bresin E, Mele C, Piras R, Liguori L, Santarsiero D, Benigni A, Remuzzi G, Noris M. An ex vivo test to investigate genetic factors conferring susceptibility to atypical haemolytic uremic syndrome. Front Immunol. 2023 Feb 9;14:1112257. doi: 10.3389/fimmu.2023.1112257. eCollection 2023.