Diffuse segmental and pure diffuse global proliferative glomerulonephritis: different patterns of class IV lupus...

Area of Science:

• Nephrology
• Immunology
• Pathology

Background:

• Lupus nephritis (LN) classification lacks consensus on differences between class IV-S and IV-G, particularly concerning renal outcomes.
• This study focuses on comparing the clinical-pathological features and prognosis of diffuse segmental (IV-S) and pure diffuse global proliferative (IV-G) LN.

Purpose of the Study:

• To investigate and compare the clinical-pathological characteristics of lupus nephritis class IV-S and pure class IV-G.
• To evaluate and contrast the renal outcomes and prognosis between these two distinct classes of lupus nephritis.

Main Methods:

• A retrospective analysis of 120 patients with biopsy-proven diffuse lupus nephritis.
• Classification into class IV-S (segmental lesion ≥ 50% glomeruli) and pure class IV-G (global lesion ≥ 50% glomeruli) based on specific criteria.
• Comparison of clinical, pathological, and prognostic features between the two groups.

Main Results:

• No significant differences in urine protein or serum creatinine levels were observed between IV-S and pure IV-G groups.
• Pure IV-G LN demonstrated higher serological activity (lower C3/C4) and increased immune deposits, including wire loops and hyaline thrombi.
• Class IV-S LN had a lower complete remission rate with IV cyclophosphamide (IVCY) induction and significantly worse 10-year renal survival rates compared to pure IV-G LN.

Conclusions:

• Lupus nephritis class IV-S and pure class IV-G exhibit distinct clinical-histological features and prognoses.
• The findings suggest potentially different underlying pathogenic mechanisms for IV-S and pure IV-G lupus nephritis.
• Class IV-S lupus nephritis is associated with a poorer renal outcome, highlighting the importance of precise classification for patient management.