No Differences in Kidney Function Decline Between People With Type 2 Diabetes Starting a Sodium-Glucose Cotransporter 2 Inhibitor or a Glucagon-like Peptide-1 Receptor Agonist: A Real-world Retrospective Comparative Observational Study.
Purpose: Diabetic nephropathy represents the leading cause of end-stage kidney disease in developed countries. Cardiovascular outcome trials have found that in participants who received a glucagon-like peptide-1 receptor agonist (GLP1RA) and a sodium-glucose cotransporter 2 inhibitor (SGLT2i), the risk of incidence and progression of diabetic nephropathy in type 2 diabetes mellitus was reduced. The aim of this study was to compare the decline in estimated glomerular filtration rate (eGFR) among people taking a GLP1RA with that among people taking an SGLT2i in a real-world setting.
Methods: Data for 478 patients with type 2 diabetes mellitus who initiated therapy with a GLP1RA (n = 254) or an SGLT2i (n = 224) between January 1, 2018 and December 31, 2021 were extracted. The primary outcome was any reduction ≥30% in eGFR after the start of therapy. Weight loss and drug discontinuation were also assessed.
Findings: Over a median follow-up of 24 months, an eGFR reduction ≥30% occurred in 34 of 254 patients (13.4%) starting a GLP1RA and in 26 of 223 patients (11.6%) starting an SGLT2i (hazard ratio = 0.89; 95% CI, 0.54-1.49; P = 0.67). Median eGFR change over the whole follow-up was similar between groups (SGLT2i: median, -2 mL/min/1.73 m2; 25th, 75th percentile, -13, 8 mL/min/1.73 m2; GLP1RA: median, 0 mL/min/1.73 m2; 25th, 75th percentile, -10, 7 mL/min/1.73 m2; P = 0.54). No worsening of kidney function was observed, even when considering the ratio eGFR mean. The value of eGFR at baseline indicated a statistically significant indirect correlation with the observed absolute value of eGFR change over the follow-up (ρ = -0.36; P < 0.001). The difference in eGFR changes over time observed by eGFR categories was statistically significant (P = 0.0001) in both treatment groups. No significant differences in weight loss and drug discontinuations were observed between groups.
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