Focal segmental glomerulosclerosis with rapid decline in renal function ("malignant FSGS")

Area of Science:

• Nephrology
• Pathology
• Internal Medicine

Background:

• Focal segmental glomerulosclerosis (FSGS) is a significant cause of kidney disease.
• Minimal change disease histology can sometimes present with FSGS.
• Understanding distinct clinical presentations of FSGS is crucial for prognosis.

Purpose of the Study:

• To characterize a specific subgroup of patients with FSGS exhibiting rapid renal decline.
• To investigate the clinical and pathological features of this distinct FSGS presentation.
• To evaluate treatment responses and outcomes in this patient cohort.

Main Methods:

• Retrospective analysis of 11 patients with renal biopsies showing minimal changes and FSGS.
• Detailed clinical data collection including onset, symptoms, and laboratory values.
• Review of treatment modalities (corticosteroids, cytotoxic drugs) and outcomes, including renal transplantation and dialysis.

Main Results:

• All 11 patients developed end-stage renal disease within 2.5 years.
• Patients presented with severe nephrotic syndrome, hypertension, hematuria, non-selective proteinuria, and hypercholesterolemia.
• Standard treatments were ineffective; proteinuria persisted even after dialysis initiation.
• Kidney allografts showed mixed outcomes, with some failing due to vascular issues but surviving grafts maintained function despite persistent proteinuria.

Conclusions:

• This cohort represents a distinct clinical subgroup of FSGS with a poor prognosis.
• The rapid progression and resistance to therapy suggest a potentially different, possibly vascular, pathogenesis.
• Further research into the etiology of this FSGS variant is warranted.