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Nephrol Dial Transplant. 2008 Apr;23(4):1298-306. Epub 2007 Nov 28.

The prognosis and pathogenesis of severe lupus glomerulonephritis.

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1
Department of Pathology, Rush University Medical College, 1753 W. Congress Parkway, Chicago, IL 60612, USA. Melvin_Schwartz@rush.edu

Abstract

BACKGROUND:

The International Society of Nephrology/ Renal Pathology Society classification (ISN/RPS) of lupus glomerulonephritis (GN) divides diffuse GN (>/=50% involvement) into diffuse segmental (IV-S) and diffuse global GN (IV-G). This division tests whether the pathogenesis and clinical outcomes are the same as when similar patients are classified using the World Health Organization (WHO) classification into severe segmental (WHO III >/=50%) and diffuse global (WHO-IV) GN.

METHODS:

Thirty-nine renal biopsies with WHO class IV and 44 with WHO III >/= 50% were reclassified using the ISN/RPS and were correlated with pathogenesis and outcome.

RESULTS:

There were 22 biopsies with ISN/RPS class IV-S. ISN/RPS class IV-G comprises two morphologically discrete classes of renal biopsies: 39 biopsies originally classified as WHO class IV (WHO-IV) and 22 that switched from WHO III >/=50% to ISN/RPS class IV-G (IV-Q). We will analyze IV-S, IV-Q and WHO-IV separately. WHO-IV had significantly more immune aggregate deposition than IV-S and IV-Q. WHO-IV had lower serum complements C3 (P = 0.05) and C4 (P = 0.05) than patients with IV-Q. Patients with WHO-IV had more remissions (56%) than IV-Q (23%) (P = 0.01), and stable renal function at the last follow-up was less frequent in patients with IV-Q (18%) than IV-S (50%, P = 0.05) and WHO-IV (62%, P = 0.001). Renal survival and renal survival without end-stage renal disease were different when the patients were diagnosed as WHO classes III >/=50% and IV, but the outcomes for ISN/RPS class IV-S and IV-G (WHO-IV plus IV-Q) were not different.

CONCLUSIONS:

WHO III >/=50% and WHO-IV lupus GN are not congruent with ISN/RPS IV-S and IV-G. The ISN/RPS minimizes pathological and outcome differences between classes IV-S and IV-G which results in the loss of informational content from the renal biopsies. ISN/RPS does not detect pathogenetic or clinical differences among patients with severe lupus GN.

PMID:
18045825
DOI:
10.1093/ndt/gfm775
[Indexed for MEDLINE]
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