Clinical trial NCT06126471: Prevalence and Pathological Features of C3 Dominant Glomerulonephritis Among Egyptian Population
Official title: Prevalence and Pathological Features of C3 Dominant Glomerulonephritis Among Egyptian Population
Study type: OBSERVATIONAL
Overall status: RECRUITING
Conditions: C3 Nephropathy
Lead sponsor: Sohag University
Sponsor class: OTHER
First posted: 2023-11-13
Enrollment: 100
Sex: ALL
Standard ages: CHILD
ADULT
OLDER_ADULT
Observational model: OTHER
Time perspective: RETROSPECTIVE
Sampling method: PROBABILITY_SAMPLE
Study population: Formalin-fixed and paraffin embedded renal tissue blocks from 100 patients.

Brief summary: A classification has introduced C3 glomerulopathy (C3 glomerulopathy consensus report) that should be used to designate a disease process due to abnormal control of complement activation, deposition, or degradation and characterized by predominant glomerular C3 fragment deposits with EM dense deposits. Also, the consensus suggested that the term glomerulonephritis with dominant C3 should be used in practice as a morphological term for those cases with dominant C3 (C3c satining) which is defined as C3 intensity ≥ 2 orders of magnitude more than any other immune reactant on a scale of 0 to 3.

C3 glomerulonephritis with 3 dominant C3 deposits include C3 glomerulopathy, post-infectious glomerulonephritis (PIGN) and others such as para-protein associated glomerulonephritis.

In C3 glomerulopathy; the alternative pathway plays a major role in pathogenesis of this group of diseases. It occurs because of dysregulation of alternative complement pathway. Dysregulation can be due to mutations of complement proteins or to autoantibodies that promote complement activation.

Classical/lectin complement pathway has shown potential in evaluation of C3 glomerulopathy. It's suggested that presence of glomerular C4d which is a product of early classical/lectin pathway, should not exclude a C3 glomerulopathy.

Another disease group with prominent C3 deposits is postinfectious glomerulonephritis (PIGN) and although PIGN has traditionally been thought of as a disease triggered by glomerular immune complex deposition but C3 deposition in absence of immune complex deposits can be seen in patients with PIGN but with the emergence of C3 glomerulonephritis (C3GN), the distinction is difficult as the clinical and pathological presentation may be similar. However, their treatment and clinical course vary significantly.

In addition there is overlap between PIGN and C3 glomerulopathy as they may both show prominent sub-epithelial humps on electron microscopy. This overlap means that it may be very difficult to decide on morphology alone whether a biopsy is a typical PIGN that will resolve, or whether it represents a C3 glomerulopathy due to an underlying complement abnormality that will lead to persistent glomerulonephritis.


Eligibility criteria: Inclusion Criteria:

1. Adequate sample with at least 10 glomeruli
2. Enough residual tissues in the paraffin blocks
3. Available clinical data

Exclusion Criteria:

Other glomerular diseases such as lupus nephritis, IgA nephropathy, membranous glomerulonephritis and immune complex-mediated membranoproliferative GN. Cases of minimal change were also excluded.

Primary outcomes:
measure: To estimate the prevalence of C3 dominant glomerulonephritis
timeFrame: One or two days after staining sections with the markers
Secondary outcomes:
Other outcomes:
Locations:
city: Sohag
country: Egypt
facility: Sohag university , faculty of medicine
Study officials:
affiliation: Sohag university, faculty of medicine, Egypt
name: Alaa Taha
role: PRINCIPAL_INVESTIGATOR
References: