Mayo Clinic Consensus Report on Membranous Nephropathy: Proposal for a Novel Classification.

Area of Science:

• Nephrology
• Immunology
• Pathology

Background:

• Membranous nephropathy (MN) is characterized by immune complex deposition in the glomeruli.
• Advances in identifying target antigens and autoantibodies have reshaped MN understanding.
• Over 14 target antigens identified, explaining 80-90% of MN cases.

Purpose of the Study:

• To propose a new, antigen-based classification for membranous nephropathy.
• To highlight the clinical and pathological significance of novel MN target antigens.
• To emphasize the need for accurate diagnosis for improved patient management.

Main Methods:

• Utilizing a combination of serology, immunofluorescence, immunohistochemistry, and mass spectrometry.
• Implementing a two-step classification algorithm: antigen identification followed by underlying disease search.
• Leveraging knowledge of target antigens to guide the search for associated conditions.

Main Results:

• Identification of at least 14 target antigens, accounting for the majority of MN cases.
• Recognition of distinct clinical and pathological phenotypes associated with novel antigens.
• Development of a proposed two-step classification system for MN.

Conclusions:

• An antigen-based classification offers accurate and specific diagnosis for membranous nephropathy.
• This approach has significant implications for guiding patient management and targeted therapies.
• Adoption of an antigen-based classification is recommended despite potential resource limitations.