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      NGAL distinguishes steroid sensitivity in idiopathic nephrotic syndrome.

      Pediatric Nephrology (Berlin, Germany)

      Acute-Phase Proteins, urine, Adolescent, Area Under Curve, Child, Child, Preschool, Creatinine, Cross-Sectional Studies, Diagnosis, Differential, Drug Resistance, Enzyme-Linked Immunosorbent Assay, Female, Glomerular Filtration Rate, Humans, Immunosuppressive Agents, therapeutic use, Kidney Function Tests, Lipocalins, Male, Nephrotic Syndrome, Young Adult, drug therapy, Proto-Oncogene Proteins, Socioeconomic Factors, Steroids

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          Abstract

          Idiopathic nephrotic syndrome (NS) is the most common glomerular disorder of childhood. Invasive biopsy remains the diagnostic method of choice for NS. Prognosis correlates with steroid responsiveness, from sensitive (SSNS) to resistant (SRNS). Neutrophil gelatinase-associated lipocalin (NGAL) has been demonstrated to be a powerful risk marker of chronic kidney disease progression. We set out to determine if urine NGAL can distinguish between patients with SRNS, SSNS, and healthy controls. Urine and clinical data were collected from patients at Cincinnati Children's Hospital who were recently diagnosed with active nephrotic syndrome as well as healthy controls. Participants included SRNS (n = 15), SSNS (n = 14), and healthy controls (n = 10). Urinary NGAL was measured by ELISA and normalized to creatinine. Median NGAL was significantly (p < 0.001) higher in SRNS (172.3 ng/ml, IQR 18.8-789) than both SSNS (6.3 ng/ml, IQR 4.9-9.9) and healthy controls (6.5 ng/ml, IQR 4.2-9.1). The area under the curve (AUC) for NGAL to distinguish SRNS from SSNS was 0.91 (p < 0.0001). NGAL levels demonstrated a significant negative correlation with glomerular filtration rate (r = -0.5, p < 0.001). Results did not change with NGAL corrected for urine creatinine and were independent of the degree of proteinuria. NGAL levels differentiate SSNS from SRNS and correlate with disease severity in SRNS.

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          Author and article information

          Journal
          22200895
          4302414
          10.1007/s00467-011-2075-7

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