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Multiple biomarkers show potential associations with kidney function decline in patients with type 2 diabetesSpecific Biomarkers May Signal Kidney Decline in Type 2 Diabetes

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Key Takeaway
Note that several biomarkers show exploratory associations with kidney function decline in type 2 diabetes.

This systematic review and meta-analysis evaluated the prognostic value of multiple biomarkers, including circulating TNFR1, TNFR2, KIM-1, Klotho, FGF-23, and urinary NGAL and KIM-1, in patients with type 2 diabetes and relatively preserved kidney function. The study aimed to identify potential indicators for early detection of kidney function decline.

The analysis identified potential positive associations between kidney function decline and circulating TNFR1, TNFR2, and KIM-1. Conversely, circulating Klotho showed an inverse association with kidney function decline. Results for circulating FGF-23 showed no significant associations, while results for urinary NGAL and urinary KIM-1 were inconsistent across the included studies.

Several limitations impact the certainty of these findings. Heterogeneity in effect measures, exposure scales, and outcome definitions prevented quantitative pooling for several biomarkers. Additionally, the small number of studies available for pooled analysis may lead to unstable effect estimates. The authors characterize these findings as exploratory, requiring validation in larger prospective studies using standardized assays and outcome definitions.

How this fits prior evidence

This meta-analysis addresses a gap in identifying early biomarkers for kidney function decline in patients with type 2 diabetes. While it does not directly relate to the previously covered findings regarding HIF-prolyl hydroxylase inhibitors, exercise interventions, GLP-1 RAs, or mineralocorticoid receptor antagonists, it provides preliminary data on potential biomarkers for monitoring diabetic kidney disease.

Researchers analyzed data from 4,569 patients with type 2 diabetes and relatively preserved kidney function. The study looked at several biomarkers, including TNFR1, TNFR2, and KIM-1, to see if they could predict a decline in kidney health.

The analysis found that higher levels of circulating TNFR1, TNFR2, and KIM-1 were linked to a decline in kidney function. In contrast, circulating Klotho showed an inverse relationship with kidney decline. Other markers, such as FGF-23, did not show significant links, while urinary NGAL and KIM-1 showed inconsistent results across different studies.

Because these findings are exploratory and based on a small number of studies, the results are not yet definitive. There is a lot of variation in how these tests were performed across the studies included. These markers may eventually help doctors detect kidney issues earlier, but more large-scale studies are needed to confirm these links before they can be used in routine care.

What this means for you:
Certain biomarkers may show a link to kidney decline in type 2 diabetes, but more research is needed.

Common questions

What biomarkers showed a link to kidney decline?

The study found that circulating TNFR1, TNFR2, and KIM-1 showed a potential positive association with kidney function decline. These markers may help identify changes in kidney health for people with type 2 diabetes. However, these results are exploratory and require more testing to be certain.

Are these tests reliable for diagnosis right now?

Not yet. The findings are currently considered exploratory because the data came from a small number of studies with different testing methods. Because of this uncertainty, these markers are not yet used as standard tools for diagnosis, and you should talk to your doctor about your specific care.

What did the study find about Klotho and FGF-23?

The study found an inverse association for circulating Klotho regarding kidney function decline. For circulating FGF-23, the researchers found no significant associations. These results are preliminary and were part of a larger look at many different markers.

Study Details

Study typeMeta analysis
EvidenceLevel 1
PublishedOct 2026
View Original Abstract ↓
BackgroundDiabetic kidney disease (DKD) is a dominant driver of chronic kidney disease (CKD) and end-stage renal disease (ESRD). Current risk assessment tools, however, lack adequate sensitivity for early disease detection. This study evaluated the prognostic value of multiple biomarkers for kidney function decline in patients with type 2 diabetes and relatively preserved kidney function.MethodsThis systematic review and meta-analysis followed the Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) guidelines. PubMed, EMBASE, Web of Science, and the Cochrane Library were searched from inception to December 31, 2025. Articles were independently screened by two reviewers against pre-specified criteria. Prospective cohort studies reporting associations between baseline biomarkers and kidney function decline were included. Methodological quality was assessed using the Quality In Prognosis Studies (QUIPS) tool. Quantitative pooling was performed only when studies were homogeneous in effect measure and outcome definition. When these criteria were not met, results were presented descriptively.ResultsNine prospective cohort studies comprising 4,569 participants were included. Circulating TNFR1, TNFR2, and KIM-1 showed potential positive associations with kidney function decline. One study reported an inverse association for circulating Klotho. No significant associations were found for circulating FGF-23. Findings for urinary NGAL and urinary KIM-1 were inconsistent across studies. Due to heterogeneity in effect measures, exposure scales, and outcome definitions, several biomarkers could not be quantitatively pooled. For pooled analyses, each analysis included only two studies; therefore, effect estimates, heterogeneity, and prediction intervals may be unstable, and the results should be considered exploratory.ConclusionsCurrent evidence suggests potential associations of circulating TNFR1, TNFR2, and KIM-1 with kidney function decline in type 2 diabetes with relatively preserved kidney function. Given the limited number of studies, these findings are exploratory and require validation in larger prospective studies with standardized assays and outcome definitions.Systematic review registrationhttps://www.crd.york.ac.uk/PROSPERO/, identifier CRD420261401816.
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