An update on predicting renal progression in IgA nephropathy.

Area of Science:

• Nephrology
• Immunology
• Renal Pathology

Background:

• Immunoglobulin A (IgA) nephropathy (IgAN) presents significant challenges in predicting individual patient renal progression due to its heterogeneous nature.
• Recent advancements offer new insights into clinical, histologic, and biomarker predictors for renal outcomes in IgAN.

Purpose of the Study:

• To review current evidence on predictors of renal outcome in IgA nephropathy.
• To highlight the utility of proteinuria as a surrogate outcome measure.
• To discuss the role of histologic features and clinical parameters in risk stratification.

Main Methods:

• Meta-analysis of clinical trials on proteinuria as a surrogate outcome.
• Validation of the MEST histologic classification in a large cohort.
• Observational study on crescents as independent predictors.
• Combination of clinical data (proteinuria, eGFR, blood pressure) with MEST-C score for prognosis.

Main Results:

• Early changes in proteinuria effectively predict long-term renal function decline.
• The MEST-C score, incorporating crescents, enhances prognostic accuracy.
• Clinical factors (proteinuria, eGFR, blood pressure) combined with MEST-C score predict prognosis without lengthy follow-up.
• No biomarkers have yet demonstrated external validation to improve prediction beyond established factors.

Conclusions:

• Proteinuria, eGFR, blood pressure, and MEST-C score are key predictors for renal prognosis in IgAN.
• Further research is needed to integrate these factors for precise patient risk stratification.
• Developing and validating biomarkers to enhance IgAN risk prediction remains an important goal.