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2017 ; 28
(3
): 995-1003
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Membranous Nephropathy: Quantifying Remission Duration on Outcome
#MMPMID27756808
Cattran DC
; Kim ED
; Reich H
; Hladunewich M
; Kim SJ
J Am Soc Nephrol
2017[Mar]; 28
(3
): 995-1003
PMID27756808
show ga
Although change in proteinuria has been proposed as a surrogate for long-term
prognosis in membranous nephropathy (MGN), variability in proteinuria levels and
lag between these changes and acceptable end points, such as ESRD, has limited
its utility. This cohort study examined the prognostic significance of remission
duration in 376 patients with biopsy-proven idiopathic/primary MGN who achieved a
remission after a period of nephrotic-range proteinuria. We defined complete
remission (CR), partial remission (PR), and relapse as proteinuria ?0.3, 0.4-3.4,
and ?3.5 g/d after CR or PR, respectively. The exposure variable was the
remission status of patients at fixed landmarks (3, 6, 12, 24, and 36 months)
after the date of first remission. The primary outcome was ESRD or 50% reduction
in eGFR. We fitted Cox proportional hazards models to examine the association of
remission status at each landmark and the primary end point. Persistent remission
associated with unadjusted hazard ratios for the primary outcome that ranged by
landmark from 0.35 (95% confidence interval, 0.20 to 0.61) to 0.56 (95%
confidence interval, 0.31 to 1.04). Separate analyses for PR and CR yielded
similar results. After adjustment, maintaining remission associated with
significantly reduced risk of the primary outcome at all landmarks. Durable
remissions associated with improved renal survival. Although the longer the
remission, the greater the improvement, patients with remission durations as
short as 3 months had improved renal prognosis compared with patients who
relapsed. This study validates and quantifies PR and CR as surrogates for
long-term outcome in MGN.