Obesity is an independent poor prognostic factor in lupus nephritis

Francy Cuervo1,2, Antoine Enfrein1, Hans-Joachim Anders3

  • 1Department of Rheumatology, Cliniques Universitaires Saint-Luc, Pôle de Pathologies Rhumatismales Inflammatoires et Systémiques, UCLouvain, Brussels, Belgium.

Lupus
|September 17, 2025
PubMed

Insights

Obesity (body mass index ≥30 kg/m²) is a significant risk factor for chronic kidney disease G3 (CKD G3) in lupus nephritis (LN). Weight management is crucial for improving long-term kidney outcomes in LN patients.

Area of Science:

  • Nephrology
  • Rheumatology
  • Internal Medicine

Background:

  • Lupus nephritis (LN) is a severe complication of systemic lupus erythematosus.
  • Chronic kidney disease (CKD) progression is a major concern in LN patients.
  • The role of obesity as a risk factor for CKD in LN requires further investigation.

Purpose of the Study:

  • To determine if obesity is a risk factor for developing chronic kidney disease G3 (CKD G3) in patients with lupus nephritis (LN).
  • To compare the rates of complete renal remission, renal flare, and CKD G3 between obese and non-obese LN patients.

Main Methods:

  • Retrospective review of 132 biopsy-proven incident LN cases with quarterly data.
  • Comparison of outcomes between obese (BMI ≥30 kg/m²) and non-obese patients.
  • Analysis of time to CKD G3, time to renal flare, and long-term CKD progression risk.

Main Results:

  • Obesity was associated with a statistically shorter time to CKD G3 and renal flare.
  • Obesity significantly increased the long-term risk of CKD progression (HR = 2.72).
  • Multivariate analysis confirmed obesity as an independent risk factor for CKD G3 (p = .029).

Conclusions:

  • A body mass index (BMI) of 30 kg/m² or higher is an independent poor prognostic factor for CKD progression in LN.
  • Weight control should be emphasized in the management of LN patients to mitigate CKD risk.
  • Obesity independently contributes to worse kidney outcomes in lupus nephritis.

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