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Diagostic Accuracy of C4d-IHC in Diagnosis of MGN
Peyman Mohammadi Torbati, Haleh Tavakolian1
1Infertility and reproductive health Reaserch Center shahid beheshti university of medical science,Tehran,Iran. haleh_tvn67@yahoo.com.
Introduction:
Membranous glomerulonephritis (MGN) is the most common cause of nephrotic syndrome in adults. The gold standard techniques for diagnosis of MGN are based on a constellation of findings given by light microscope, electron microscope (EM), and immunofluorescence (IF). Occasionally, only formalin-fixed tissues are available for the analysis by light microscopy, which have limitations in differentiating minimal change diseases from MGN. Recently, the usage of C4d immunohistochemistry (IHC) has been proposed for the diagnosis of MGN. The aim of this study was to evaluate the accuracy of C4d-IHC in diagnosis of MGN.
Methods:
The present investigation conducted on patients with nephrotic syndrome who underwent renal biopsy in Labbafinejad hospital, from 2016 to 2017. The entire specimens were examined by light microscope, immunofluorescence, and electron microscope as a gold standard method for diagnosis of MGN. The samples were then stained for C4d immunohistochemical analysis. Eventually, the sensitivity, specificity, positive, and negative predictive value for C4d-IHC was determined.
Results:
The sensitivity and specificity of the C4d-IHC in order to differentiate MGN from other glomerulopathies were 95% and 87.5%, respectively. In addition, the negative and positive predictive values were 97.2% and 79.16%, respectively.
Conclusion:
It was ultimately attained that C4d-IHC has more accuracy in identification and diagnosis of MGN, in contrary to EM and IF, this method is more usable and cost effective, which requires a lower level of skill and advanced equipment. Indeed, this technique does not require fresh specimen.
Insights
C4d immunohistochemistry (IHC) accurately diagnoses membranous glomerulonephritis (MGN), the leading cause of nephrotic syndrome. This cost-effective method offers high sensitivity and specificity, proving more practical than traditional techniques.
Area of Science:
- Nephrology
- Pathology
- Immunohistochemistry
Background:
- Membranous glomerulonephritis (MGN) is a primary cause of nephrotic syndrome in adults.
- Diagnosis typically relies on light microscopy, electron microscopy (EM), and immunofluorescence (IF).
- Limitations exist with formalin-fixed tissues, hindering differentiation from other glomerular diseases.
Purpose of the Study:
- To evaluate the diagnostic accuracy of C4d immunohistochemistry (IHC) for membranous glomerulonephritis (MGN).
- To compare the efficacy of C4d-IHC with established diagnostic methods.
Main Methods:
- Retrospective analysis of renal biopsy specimens from patients with nephrotic syndrome (2016-2017).
- Specimens were evaluated using light microscopy, immunofluorescence, and electron microscopy as the gold standard.
- C4d immunohistochemistry (IHC) staining was performed on the same specimens.
Main Results:
- C4d-IHC demonstrated a sensitivity of 95% and specificity of 87.5% in differentiating MGN.
- Positive and negative predictive values for C4d-IHC were 79.16% and 97.2%, respectively.
- The method showed high accuracy in identifying MGN.
Conclusions:
- C4d-IHC is a highly accurate, cost-effective, and user-friendly diagnostic tool for MGN.
- It offers advantages over EM and IF, requiring less specialized equipment and skill.
- This technique is suitable for formalin-fixed tissues, expanding diagnostic capabilities.
