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2018 ; 11
(2
): 207-218
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Interstitial inflammation and interstitial fibrosis and tubular atrophy predict
renal survival in lupus nephritis
#MMPMID29644061
Wilson PC
; Kashgarian M
; Moeckel G
Clin Kidney J
2018[Apr]; 11
(2
): 207-218
PMID29644061
show ga
BACKGROUND: This study examines the effect of interstitial inflammation and
interstitial fibrosis and tubular atrophy on renal survival in lupus nephritis.
METHODS: Baseline characteristics, initial (n = 301) and repeat biopsies (n = 94)
and clinical outcomes for patients with biopsy-proven lupus nephritis from 1998
to 2014 were retrospectively collected from the medical record. Clinical and
morphologic variables were evaluated using a Cox proportional hazards model and
multiple imputation to address missing data. Renal survival was defined as the
time from initial biopsy to end-stage renal disease [estimated glomerular
filtration rate (eGFR) <15?mL/min/1.73 m(2)], dialysis or transplant. RESULTS: A
total of 218 patients had follow-up and Class IV had worse renal survival,
especially in patients with active and chronic glomerular lesions {relative to
non-IV; Class IV-A: hazard ratio [HR] 0.92 [95% confidence interval (CI)
0.41-2.04], Class IV-AC: HR 5.02 [95% CI 2.70-9.36]}. Interstitial inflammation
grade [relative to interstitial inflammation <5%; interstitial inflammation
5-25%: HR 2.36 (95% CI 1.13-4.91), interstitial inflammation 25-50%: HR 3.84 (95%
CI 1.53-9.62), interstitial inflammation >50%: HR 7.67 (95% CI 3.75-15.67)] and
increased interstitial fibrosis and tubular atrophy (IFTA) category [relative to
IFTA <5%; IFTA 5-25%: HR 3.93 (95% CI 1.58-9.75), IFTA 25-50%: HR 4.01 (95% CI
1.37-11.70), IFTA >50%: HR 13.99 (95% CI 4.91-39.83)] predicted worse renal
survival among all patients and those with Class IV on initial and repeat biopsy
(n = 94) in a dose-dependent manner. Interstitial inflammation grade and IFTA
category were significant predictors of renal survival in a multivariable model
adjusted for age, gender, race, ethnicity and serum creatinine. CONCLUSIONS:
Interstitial inflammation and IFTA independently affect renal survival and
grading these lesions stratifies risk within the International Society of
Nephrology and Renal Pathology Society classification of lupus nephritis.