Morphological Indexes: Can They Predict Lupus Nephritis Outcomes? A Retrospective Study

Area of Science:

• Nephrology
• Rheumatology
• Pathology

Background:

• Lupus nephritis is a severe complication of systemic lupus erythematosus.
• Current therapy relies on International Society of Nephrology / Renal Pathology Society classification, but histomorphological indexes are underutilized.
• This study evaluates the predictive value of histomorphological indexes for treatment response and prognosis in lupus nephritis.

Purpose of the Study:

• To analyze the importance and applicability of histomorphological indexes in lupus nephritis.
• To determine if Austin and Hill's indexes predict treatment response and patient prognosis.
• To compare the predictive power of these indexes against the standard classification.

Main Methods:

• Retrospective analysis of 46 lupus nephritis cases with renal biopsies from 2010-2016.
• Evaluation of demographic data, comorbidities, clinical presentation, and laboratory results.
• Histologic analysis using ISN/RPS classification and Austin (Activity, Chronicity) and Hill indexes; outcomes assessed included remission, renal function, and proteinuria.

Main Results:

• Class IV lupus nephritis patients presented with lower eGFR and higher proteinuria.
• No correlation found between ISN/RPS classification and end-of-follow-up outcomes.
• Hill and Austin's Chronicity indexes correlated with renal function and proteinuria; Austin's Activity index correlated with immunological markers.

Conclusions:

• Histological findings are fundamental in lupus nephritis assessment due to poor clinical-histologic correlation.
• Histomorphological indexes (Austin, Hill) are easily obtainable and predict renal outcomes.
• These indexes support current guidelines and aid in managing lupus nephritis patients.