Nephrotic Syndrome Study Network

  • STATUS
    Recruiting
  • End date
    Jun 30, 2024
  • participants needed
    1200
  • sponsor
    University of Michigan
Updated on 26 January 2021
edema
nephropathy
immunosuppression
total protein
proteinuria
end stage renal disease
end-stage renal disease
rare diseases
kidney biopsy
nephrotic syndrome
minimal change disease

Summary

Minimal change disease (MCD), focal segmental glomerulosclerosis (FSGS), and Membranous nephropathy (MN), generate an enormous individual and societal financial burden, accounting for approximately 12% of prevalent end stage renal disease (ESRD) cases (2005) at an annual cost in the US of more than $3 billion. However, the clinical classification of these diseases is widely believed to be inadequate by the scientific community. Given the poor understanding of MCD/FSGS and MN biology, it is not surprising that the available therapies are imperfect. The therapies lack a clear biological basis, and as many families have experienced, they are often not beneficial, and in fact may be significantly toxic. Given these observations, it is essential that research be conducted that address these serious obstacles to effectively caring for patients.

In response to a request for applications by the National Institutes of Health, Office of Rare Diseases (NIH, ORD) for the creation of Rare Disease Clinical Research Consortia, a number of affiliated universities joined together with The NephCure Foundation the NIDDK, the ORDR, and the University of Michigan in collaboration towards the establishment of a Nephrotic Syndrome (NS) Rare Diseases Clinical Research Consortium.

Through this consortium the investigators hope to understand the fundamental biology of these rare diseases and aim to bank long-term observational data and corresponding biological specimens for researchers to access and further enrich.

Description

Idiopathic Nephrotic Syndrome (NS) is a rare disease syndrome responsible for approximately 12% of all causes of end-stage kidney disease (ESRD) and up to 20% of ESRD in children. Treatment strategies for Focal and Segmental Glomerulosclerosis (FSGS), Minimal Change Disease (MCD) and Membranous Nephropathy (MN), the major causes of NS, include high dose prolonged steroid therapy, cyclophosphamide, cyclosporine A, tacrolimus, mycophenolate mofetil and other immunosuppressive agents, which all carry significant side effects. Failure to obtain remission using the current treatment approaches frequently results in progression to ESRD with its associated costs, morbidities, and mortality. In the North American Pediatric Renal Trials and Collaborative Studies (NAPRTCS) registry, half of the pediatric patients with Steroid Resistant Nephrotic Syndrome required renal replacement therapy within two years of being enrolled in the disease registry. FSGS also has a high recurrence rate following kidney transplantation (30-40%) and is the most common recurrent disease leading to allograft loss.

The prevailing classification of Nephrotic Syndrome categorizes patients into FSGS, MCD, and MN, if in the absence of other underlying causes, glomerular histology shows a specific histological pattern. This classification does not adequately predict the heterogeneous natural history of patients with FSGS, MCD, and MN. Major advances in understanding the pathogenesis of FSGS and MCD have come over the last ten years from the identification of several mutated genes responsible for causing Steroid Resistant Nephrotic Syndrome (SRNS) presenting with FSGS or MCD histopathology in humans and model organisms. These functionally distinct genetic disorders can present with indistinguishable FSGS lesions on histology confirming the presence of heterogeneous pathogenic mechanisms under the current histological diagnoses.

The limited understanding of FSGS, MCD, and MN biology in humans has necessitated a descriptive classification system in which heterogeneous disorders are grouped together. This invariably consigns these heterogeneous patients to the same therapeutic approaches, which use blunt immunosuppressive drugs that lack a clear biological basis, are often not beneficial, and are complicated by significant toxicity. The foregoing shortcomings make a strong case that concerted and innovative investigational strategies combining basic science, translational, and clinical methods should be employed to study FSGS, MCD, and MN. It is for these reasons that the Nephrotic Syndrome Study Network is established to conduct clinical and translational research in patients with FSGS/MCD and MN.

Details
Condition Membranous glomerulonephritis, Focal glomerulosclerosis, Glomerulonephritis, Autoimmune disease, Lipoid nephrosis, Idiopathic Membranous Nephropathy, Focal Segmental Glomerulosclerosis, minimal change disease, membranous nephropathy
Treatment Kidney Biopsy
Clinical Study IdentifierNCT01209000
SponsorUniversity of Michigan
Last Modified on26 January 2021

Eligibility

Yes No Not Sure

Inclusion Criteria

Patients presenting with an incipient clinical diagnosis for FSGS/MCD or MN or
pediatric participants not previously biopsied, with a clinical diagnosis for
FSGS/MCD or MN meeting the following inclusion criteria
Documented urinary protein excretion 1500 mg/24 hours or spot protein: creatinine ratio equivalent at the time of diagnosis or within 3 months of the screening/eligibility visit
Scheduled renal biopsy
Cohort B (non-biopsy, cNEPTUNE) Inclusion Criteria
Age <19 years of age
Initial presentation with <30 days immunosuppression therapy
Proteinuria/nephrotic
UA>2+ and edema OR
UA>2+ and serum albumin <3 OR
UPC > 2g/g and serum albumin <3

Exclusion Criteria

Prior solid organ transplant
A clinical diagnosis of glomerulopathy without diagnostic renal biopsy
Clinical, serological or histological evidence of systemic lupus erythematosus (SLE) as defined by the ARA criteria. Patients with membranous in combination with SLE will be excluded because this entity is well defined within the International Society of Nephrology/Renal Pathology Society categories of lupus nephritis, and frequently overlaps with other classification categories of SLE nephritis (68)
Clinical or histological evidence of other renal diseases (Alport, Nail Patella, Diabetic Nephropathy, IgA-nephritis, monoclonal gammopathy (multiple myelomas), genito-urinary malformations with vesico-urethral reflux or renal dysplasia)
Known systemic disease diagnosis at time of enrollment with a life expectancy less than 6 months
Unwillingness or inability to give a comprehensive informed consent
Unwillingness to comply with study procedures and visit schedule
Institutionalized individuals (e.g., prisoners)
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