TY - JOUR
T1 - Kidney biopsy chronicity grading in antineutrophil cytoplasmic antibody-associated vasculitis
AU - Moura, Marta Casal
AU - Fervenza, Fernando C.
AU - Specks, Ulrich
AU - Sethi, Sanjeev
N1 - Publisher Copyright:
© The Author(s) 2021.
PY - 2022/9/1
Y1 - 2022/9/1
N2 - Background. Kidney biopsy is valuable for prognostic assessment of renal outcomes in antineutrophil cytoplasmic antibody (ANCA)-associated vasculitis (AAV) with glomerulonephritis (AAV-GN) but the impact of chronic changes is not determined. Methods. We conducted a retrospective cohort study of myeloperoxidase (MPO)- or proteinase 3 (PR3)-ANCA-positive patients with AAV and active renal disease. We applied the Mayo Clinic Chronicity Score (MCCS) and validated and evaluated its implications on outcome prediction in AAV-GN. Results. We analyzed 329 patients with kidney biopsies available to score. The extent of chronicity was graded by MCCS as minimal [102 (31.0%)], mild [106 (32.2%)], moderate [86 (26.1%)] and severe [35 (10.6%)]. The MCCS grades correlated with the degree of renal function impairment at presentation [mean estimated glomerular filtration rate (eGFR) 48.3 versus 29.2 versus 23.7 versus 18.5 mL/min/1.73 m2, respectively; P < 0.0001]. Higher degrees of the individual components of the MCCS (glomerulosclerosis, interstitial fibrosis, tubular atrophy and arteriosclerosis) were associated with lower median eGFR (P < 0.0001) and decreased event-free [kidney failure (KF) and death] survival (P ¼ 0.002, P < 0.0001, P < 0.0001 and P ¼ 0.017, respectively). Patients with lower MCCS grades recovered renal function more frequently (P < 0.0001). Increasing MCCS grades were associated with decreased renal recovery (P ¼ 0.001), more frequent events and shorter time to KF (P < 0.0001), KF and death (P < 0.0001) and death (P ¼ 0.042), independent of the remission induction treatment used (cyclophosphamide or rituximab). The MCCS stratified renal outcomes for each MCCS grade and can be used in clinical practice as a cutoff for KF prediction (MCCS ≥4). Conclusions. Chronic changes on kidney histology independently predict renal function, outcomes and response to treatment in AAV-GN.
AB - Background. Kidney biopsy is valuable for prognostic assessment of renal outcomes in antineutrophil cytoplasmic antibody (ANCA)-associated vasculitis (AAV) with glomerulonephritis (AAV-GN) but the impact of chronic changes is not determined. Methods. We conducted a retrospective cohort study of myeloperoxidase (MPO)- or proteinase 3 (PR3)-ANCA-positive patients with AAV and active renal disease. We applied the Mayo Clinic Chronicity Score (MCCS) and validated and evaluated its implications on outcome prediction in AAV-GN. Results. We analyzed 329 patients with kidney biopsies available to score. The extent of chronicity was graded by MCCS as minimal [102 (31.0%)], mild [106 (32.2%)], moderate [86 (26.1%)] and severe [35 (10.6%)]. The MCCS grades correlated with the degree of renal function impairment at presentation [mean estimated glomerular filtration rate (eGFR) 48.3 versus 29.2 versus 23.7 versus 18.5 mL/min/1.73 m2, respectively; P < 0.0001]. Higher degrees of the individual components of the MCCS (glomerulosclerosis, interstitial fibrosis, tubular atrophy and arteriosclerosis) were associated with lower median eGFR (P < 0.0001) and decreased event-free [kidney failure (KF) and death] survival (P ¼ 0.002, P < 0.0001, P < 0.0001 and P ¼ 0.017, respectively). Patients with lower MCCS grades recovered renal function more frequently (P < 0.0001). Increasing MCCS grades were associated with decreased renal recovery (P ¼ 0.001), more frequent events and shorter time to KF (P < 0.0001), KF and death (P < 0.0001) and death (P ¼ 0.042), independent of the remission induction treatment used (cyclophosphamide or rituximab). The MCCS stratified renal outcomes for each MCCS grade and can be used in clinical practice as a cutoff for KF prediction (MCCS ≥4). Conclusions. Chronic changes on kidney histology independently predict renal function, outcomes and response to treatment in AAV-GN.
KW - ANCA
KW - Mayo Clinic Chronicity Score
KW - glomerulonephritis
KW - kidney biopsy
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U2 - 10.1093/ndt/gfab250
DO - 10.1093/ndt/gfab250
M3 - Article
C2 - 34436585
AN - SCOPUS:85118717424
SN - 0931-0509
VL - 37
SP - 1710
EP - 1721
JO - Nephrology Dialysis Transplantation
JF - Nephrology Dialysis Transplantation
IS - 9
ER -