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Journal of Nephrology

, Volume 31, Issue 4, pp 543–550 | Cite as

Routine immunohistochemical staining in membranous nephropathy: in situ detection of phospholipase A2 receptor and thrombospondin type 1 containing 7A domain

  • Vincenzo L’Imperio
  • Federico Pieruzzi
  • Renato Alberto Sinico
  • Manuela Nebuloni
  • Antonio Granata
  • Andrew Smith
  • Antonella Radice
  • Fabio Pagni
Original Article
First Online:

Abstract

Background

Membranous nephropathy (MN) can be idiopathic (iMN) or manifest as a result of systemic underlying conditions as a secondary epiphenomenon. For the prognostic and predictive consequences of this discrimination, the routine use of reliable markers is crucial. This large MN series aimed to evaluate the routine and standardized immunohistochemical (IHC) employment of a panel of 3 biomarkers—phospholipase A2 receptor (PLA2R), thrombospondin type-1 domain-containing 7A (THSD7A), and immunoglobulin (Ig)G4—in the differential diagnosis of MN forms, contributing to the validation of the technique and the correct interpretation of reproducible patterns of reactivity.

Methods

We classified 95 patients with a biopsy proven diagnosis of MN as primary (n = 72) or secondary (n = 23) cases based on clinical data. After performing an IHC assay directed against PLA2R, THSD7A and IgG4 antigens, samples were interpreted by three different nephropathologists to assess the positivity/negativity of the staining according to new interpretation criteria.

Results

Useful interpretation criteria were introduced to exclude false positive patterns of reactivity and to identify only true granular membranous or mesangial deposits in MN. The IHC directed against PLA2R resulted positive in 51 iMN cases and negative in 21, while 4/23 secondary forms were considered positive. Based on these data the technique showed a sensitivity of 71% and specificity of 83%. On the other hand, the IHC analysis for IgG4 resulted positive in 44 cases of iMN and negative in 28 cases, while only 4/23 secondary forms were positive (same cases positive to PLA2R). Finally, THSD7A was found to be positive only in 1 case, which was negative to PLA2R and IgG4. The combination of the results allowed a classification of the series into two major groups: “double-positive” (PLA2R+/IgG4+/THSD7A−) and “triple-negative” (PLA2R−/IgG4−/THSD7A−) cases.

Conclusions

Based on these data, the diagnostic performance of the three biomarkers used in a “tandem fashion” can reach 79% sensitivity and 83% specificity, significantly reducing the risk of a false-positive or false-negative result and improving the routine characterization of this frequent glomerulonephritis.

Keywords

PLA2R Membranous nephropathy THSD7A 
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Notes

Acknowledgements

Our special thanks go to Carla Scalia, Loredana Tusa and Lorella Riva for their technical support and to nephrological team of the San Gerardo Hospital for the routine execution of the renal biopsies.

Funding

No support was used for this study.

Compliance with ethical standards

Conflict of interest

The authors declare that they have no conflict of interest.

Ethical approval

All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards.

Informed consent

For this type of study formal consent is not required.

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Copyright information

© Italian Society of Nephrology 2018

Authors and Affiliations

  • Vincenzo L’Imperio
    • 1
  • Federico Pieruzzi
    • 2
  • Renato Alberto Sinico
    • 2
  • Manuela Nebuloni
    • 3
    • 4
  • Antonio Granata
    • 5
  • Andrew Smith
    • 6
  • Antonella Radice
    • 7
  • Fabio Pagni
    • 1
    • 4
  1. 1.Department of Medicine and Surgery, PathologyUniversity of Milano-Bicocca, San Gerardo HospitalMonzaItaly
  2. 2.Nephrology Unit, Department of Medicine and SurgeryUniversity of Milano-BicoccaMonzaItaly
  3. 3.Department of Biomedical and Clinical Sciences L. SaccoUniversity of MilanMilanItaly
  4. 4.Research Center for Renal ImmunopathologyUniversity of MilanMilanItaly
  5. 5.Department of NephrologySan Giovanni Di Dio HospitalAgrigentoItaly
  6. 6.Proteomics and Metabolomics Unit, Department of Medicine and SurgeryUniversity of Milano-BicoccaMonzaItaly
  7. 7.Microbiology and Virology DepartmentSan Carlo Borromeo HospitalMilanItaly

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