Factors Associated With Rapid Progression to Endstage Kidney Disease in Lupus Nephritis.

Objective: Lupus nephritis (LN) may lead to endstage kidney disease (ESKD) in 22% of patients over a period of 15 years, with the risk being particularly higher in diffuse proliferative forms. The rate of kidney function decline varies. However, a catastrophic course leading to ESKD within a few years from onset is uncommon. The aim of the present study was to assess the factors associated with rapid progression to ESKD in patients with LN.

Methods: Patients from the Toronto Lupus Clinic with biopsy-proven LN at presentation and estimated glomerular filtration rate (eGFR) 60 mL/min/1.73 m2, who developed ESKD within 3 years were retrieved. Pathology reports were reviewed with particular emphasis on distinct histopathologic features. Demographic, clinical, laboratory, and therapeutic variables were also analyzed.

Results: Ten patients (1.8% of the total LN population) developed ESKD within 3 years of diagnosis. Their mean age was 34.2 ± 7.3 years, mean time to ESKD 19.2 ± 12.4 months, initial eGFR 90.2 ± 24.9 mL/min/1.73 m2, proteinuria 2.7 ± 1.04 g/24 h. The median rate of kidney function decline was > 43 mL/min/1.73 m2/year. One patient had LN class III, 5 had LN class IV, 2 had membranous LN (class V), and another 2 had mixed IV/V. Moreover, 2 patients had extensive thrombotic microangiopathy, 1 collapsing glomerulonephritis, and 1 concomitant antiglomerular basement membrane (anti-GBM) nephropathy. Four patients showed no unusual kidney pathology; all of them had severe noncompliance (discontinued all medications to follow alternative treatment).

Conclusion: Catastrophic progression to ESKD is uncommon in LN. The major associated factors are poor compliance and distinct histopathologic features such as thrombotic microangiopathy, collapsing glomerulopathy, and concomitant anti-GBM nephropathy.