SGLT2 inhibitors slow kidney disease progression
SGLT2 inhibitors lowered kidney failure and slowed kidney decline across a wide range of baseline kidney function and urine albumin levels.
*Meta-analysis of randomized, double-blind, placebo-controlled trials; Level 1a (OCEBM).
Citation
Neuen BL, Fletcher RA, Anker SD, et al; SMART-C. SGLT2 Inhibitors and Kidney Outcomes by Glomerular Filtration Rate and Albuminuria: A Meta-Analysis. JAMA. 2026;335(3):233-244. Published online November 7, 2025. doi:10.1001/jama.2025.20834
Background
These diabetes medicines (SGLT2 inhibitors) are known to protect kidneys, but benefits in advanced kidney disease or with little to no urine albumin have been uncertain. This study tested whether baseline kidney filtering rate or urine albumin level changes the kidney benefit.
Patients
70,361 adults in 10 randomized trials (35% female; mean age 64.8 years) with type 2 diabetes, chronic kidney disease, or heart failure. Exclusions: trials with fewer than 500 participants per group, follow-up under 6 months, or kidney outcomes not systematically collected; excluded drugs without an approved kidney indication.
Intervention
Canagliflozin, dapagliflozin, or empagliflozin.
Control
Placebo.
Outcome
Primary: chronic kidney disease progression (kidney failure, ≥50% drop in kidney filtering rate, or death due to kidney failure). Secondary: kidney failure alone; serious sudden kidney injury; yearly rate of kidney filtering decline.
Follow-up Period
At least 6 months (varied by trial).
Results
| Outcome |
Effect (SGLT2 inhibitor vs placebo) |
Absolute effect |
| Chronic kidney disease progression (primary) |
Hazard ratio 0.62 (95% CI, 0.57-0.68) |
25.4 vs 40.3 events per 1000 patient-years; NNT ≈ 67 per year |
| Kidney failure alone |
Hazard ratio 0.66 (95% CI, 0.58-0.75) |
— |
| Serious sudden kidney injury |
Hazard ratio 0.74 (95% CI, 0.66-0.82) |
— |
| Yearly kidney filtering decline (slope) |
51% slower decline (95% CI, 49%-54%) |
1.26 mL/min/1.73 m2/year less decline |
Effects on chronic kidney disease progression were consistent across baseline kidney filtering rate and urine albumin subgroups, including stage 4 chronic kidney disease and minimal albumin in the urine. Analyses used an intention-to-treat approach.
Limitations
Not a full systematic review; trials were limited to a consortium. Very limited data for starting treatment when kidney filtering rate was under 20. Few primary-outcome events in participants without diabetes and with normal urine albumin reduced certainty for that subgroup.
Funding
No industry funding for meta-analysis; included trials were industry funded.
Clinical Application
Use SGLT2 inhibitors for kidney protection across chronic kidney disease stages and urine albumin levels when eligible; do not withhold solely due to stage 4 disease.