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Background: Autosomal dominant polycystic kidney disease (ADPKD) has phenotypic variability only partially explained by established biomarkers that do not readily assess pathologically important factors of inflammation and kidney fibrosis. We evaluated asymptomatic pyuria (AP), a surrogate marker of inflammation, as a biomarker for disease progression.
Methods: We performed a retrospective cohort study of adult patients with ADPKD. Patients were divided into AP and no pyuria (NP) groups. We evaluated the effect of pyuria on kidney function and kidney volume. Longitudinal models evaluating kidney function and kidney volume rate of change with respect to incidences of AP were created.
Results: There were 687 included patients (347 AP, 340 NP). The AP group had more women (65% versus 49%). Median ages at kidney failure were 86 and 80 years in the NP and AP groups (log rank, =0.49), respectively, for patients in Mayo Imaging Class (MIC) 1A-1B as compared with 59 and 55 years for patients in MIC 1C-1D-1E (log rank, =0.02), respectively. Compared with the NP group, the rate of kidney function (ml/min per 1.73 m per year) decline shifted significantly after detection of AP in the models, including all patients (-1.48; <0.001), patients in MIC 1A-1B (-1.79; <0.001), patients in MIC 1C-1D-1E (-1.18; <0.001), and patients with (-1.04; <0.001). Models evaluating kidney volume rate of growth showed no change after incidence of AP as compared with the NP group.
Conclusions: AP is associated with kidney failure and faster kidney function decline irrespective of the ADPKD gene, cystic burden, and cystic growth. These results support AP as an enriching prognostic biomarker for the rate of disease progression.
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| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC9034817 | PMC |
| http://dx.doi.org/10.34067/KID.0004292021 | DOI Listing |
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