A histopathological scoring and grading system to predict outcome for patients with AA amyloidosis.

International Urology and Nephrology
Aygul CeltikHuseyin Toz

Abstract

Renal involvement is associated with significant morbidity and mortality in AA amyloidosis. Extend of amyloid deposition in kidney biopsies may be predictive for clinical manifestations and outcomes. The aim of our study is to assess clinical features of patients with biopsy-proven renal AA amyloidosis and to evaluate the relationship between histopathological scoring and grading of renal amyloid deposition with clinical findings and outcomes. The study included 86 patients who were diagnosed with renal AA amyloidosis. The demographic and clinical features at the time of biopsy and follow-up data were retrospectively collected. Amyloid deposition in glomeruli, interstitium, vessels and tubulointerstitial findings were scored and renal amyloid prognostic score (RAPS) was assigned by adding all scores. RAPS was further divided into three grades (RAPS grade I, II, III). Median age was 50 (36-59) years. Familial Mediterranean fever was the leading cause. RAPS grade and interstitial inflammatory infiltration were associated with baseline eGFR and glomerular amyloid deposition was associated with proteinuria. During the follow-up period (median 50 months), 39 patients developed ESRD. Extensive (involving > 50%) glomerular amyloid dep...Continue Reading

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