Rina Mina1, Khalid Abulaban1, Marisa S Klein-Gitelman2, Barbara A Eberhard3, Stacy P Ardoin4, Nora Singer5, Karen Onel6, Lori Tucker7, Kathleen O'neil8, Tracey Wright9, Elizabeth Brooks10, Kelly Rouster-Stevens11, Lawrence Jung12, Lisa Imundo13, Brad Rovin14, David Witte1, Jun Ying15, Hermine I Brunner1. 1. Cincinnati Children's Hospital Medical Center, Cincinnati, Ohio. 2. Ann & Lurie Children's Hospital, Chicago, Illinois. 3. Steven and Alexandra Cohen Children's Medical Center of New York, New York. 4. Nationwide Children's Hospital and Ohio State University, Columbus. 5. MetroHealth Medical Center and Case Western Reserve University, Cleveland, Ohio. 6. University of Chicago Comer Children's Hospital, Chicago, Illinois. 7. British Columbia Children's Hospital, Vancouver, British Columbia, Canada. 8. Riley Hospital for Children, Indianapolis, Indiana. 9. Texas Scottish Rite Hospital, Dallas. 10. University Hospitals Rainbow Babies & Children's Hospital, Cleveland, Ohio. 11. Children's Healthcare of Atlanta, Atlanta, Georgia. 12. Children's National Health System, Washington, DC. 13. Columbia University Medical Center, New York, New York. 14. Ohio State University Wexner Medical Center, Columbus. 15. University of Cincinnati, Cincinnati, Ohio.
Abstract
OBJECTIVE: To validate clinical indices of lupus nephritis activity and damage when used in children against the criterion standard of kidney biopsy findings. METHODS: In 83 children requiring kidney biopsy, the Systemic Lupus Erythematosus Disease Activity Index renal domain (SLEDAI-R), British Isles Lupus Assessment Group index renal domain (BILAG-R), Systemic Lupus International Collaborating Clinics (SLICC) renal activity score (SLICC-RAS), and SLICC Damage Index renal domain (SDI-R) were measured. Fixed effects and logistic models were calculated to predict International Society of Nephrology/Renal Pathology Society (ISN/RPS) class; low-to-moderate versus high lupus nephritis activity (National Institutes of Health [NIH] activity index [AI]) score: ≤10 versus >10; tubulointerstitial activity index (TIAI) score: ≤5 versus >5; or the absence versus presence of lupus nephritis chronicity (NIH chronicity index) score: 0 versus ≥1. RESULTS: There were 10, 50, and 23 patients with ISN/RPS class I/II, III/IV, and V, respectively. Scores of the clinical indices did not differentiate among patients by ISN/RPS class. The SLEDAI-R and SLICC-RAS but not the BILAG-R differed with lupus nephritis activity status defined by NIH-AI scores, while only the SLEDAI-R scores differed between lupus nephritis activity status based on TIAI scores. The sensitivity and specificity of the SDI-R to capture lupus nephritis chronicity was 23.5% and 91.7%, respectively. Despite being designed to measure lupus nephritis activity, SLICC-RAS and SLEDAI-R scores significantly differed with lupus nephritis chronicity status. CONCLUSION: Current clinical indices of lupus nephritis fail to discriminate ISN/RPS class in children. Despite its shortcomings, the SLEDAI-R appears best for measuring lupus nephritis activity in a clinical setting. The SDI-R is a poor correlate of lupus nephritis chronicity.
OBJECTIVE: To validate clinical indices of lupus nephritis activity and damage when used in children against the criterion standard of kidney biopsy findings. METHODS: In 83 children requiring kidney biopsy, the Systemic Lupus Erythematosus Disease Activity Index renal domain (SLEDAI-R), British Isles Lupus Assessment Group index renal domain (BILAG-R), Systemic Lupus International Collaborating Clinics (SLICC) renal activity score (SLICC-RAS), and SLICC Damage Index renal domain (SDI-R) were measured. Fixed effects and logistic models were calculated to predict International Society of Nephrology/Renal Pathology Society (ISN/RPS) class; low-to-moderate versus high lupus nephritis activity (National Institutes of Health [NIH] activity index [AI]) score: ≤10 versus >10; tubulointerstitial activity index (TIAI) score: ≤5 versus >5; or the absence versus presence of lupus nephritis chronicity (NIH chronicity index) score: 0 versus ≥1. RESULTS: There were 10, 50, and 23 patients with ISN/RPS class I/II, III/IV, and V, respectively. Scores of the clinical indices did not differentiate among patients by ISN/RPS class. The SLEDAI-R and SLICC-RAS but not the BILAG-R differed with lupus nephritis activity status defined by NIH-AI scores, while only the SLEDAI-R scores differed between lupus nephritis activity status based on TIAI scores. The sensitivity and specificity of the SDI-R to capture lupus nephritis chronicity was 23.5% and 91.7%, respectively. Despite being designed to measure lupus nephritis activity, SLICC-RAS and SLEDAI-R scores significantly differed with lupus nephritis chronicity status. CONCLUSION: Current clinical indices of lupus nephritis fail to discriminate ISN/RPS class in children. Despite its shortcomings, the SLEDAI-R appears best for measuring lupus nephritis activity in a clinical setting. The SDI-R is a poor correlate of lupus nephritis chronicity.
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