Background and Aims
The SUSTAIN 6 cardiovascular outcomes trial (CVOT) indicated that once-weekly (OW) subcutaneous (s.c.) semaglutide may have beneficial effects on kidney function. SUSTAIN 6 and the more recent PIONEER 6 CVOT (oral semaglutide) had similar designs and subject populations; both evaluated the effects of semaglutide compared with placebo on important macro- and microvascular outcomes. This post hoc analysis of pooled data from the two trials evaluated the effects of semaglutide vs placebo on kidney function, assessed by estimated glomerular filtration rate (eGFR) slope. Method
Data for 6,480 subjects from SUSTAIN 6 (OW s.c. semaglutide 0.5 and 1.0 mg or placebo, n=3,297; median follow-up 2.1 years) and PIONEER 6 (oral semaglutide once-daily 14 mg or placebo, n=3,183; median follow-up 1.3 years) were pooled into two groups: semaglutide and placebo. Annual change in eGFR was compared between semaglutide and placebo in patients with eGFR data at baseline, both overall and by baseline eGFR subgroup (≥30–<60 or ≥60 mL/min/1.73 m2). Data were analysed using a linear random regression model with individual intercept and time slope. Estimated treatment difference (ETD) between annual rates of eGFR slope (from baseline to timepoint of interest) was calculated at Year 1 and Year 2 (Year 2 data predominantly from SUSTAIN 6); interaction p-values indicated differences between subgroups. Results
In the overall treatment population, the annual rate of eGFR change was 0.60 mL/min/1.73 m2 (95% confidence interval [CI]: 0.31;0.90; p<0.0001) lower with semaglutide vs placebo in Year 1. In the subgroup with an eGFR ≥60 mL/min/1.73 m2 at baseline, the ETD for semaglutide vs placebo at Year 1 was 0.48 mL/min/1.73 m2/year (95% CI: 0.13;0.82). Whereas, at Year 1, the subgroup with eGFR ≥30–<60 mL/min/1.73 m2 had an ETD of 1.07 mL/min/1.73 m2/year (95% CI: 0.46;1.68) (Table). Accordingly, a numerically larger difference in ETD was observed in the eGFR ≥30–<60 mL/min/1.73 m2 vs the eGFR ≥60 mL/min/1.73 m2 subgroup (not statistically significant; pinteraction=0.21). Conclusion
Semaglutide was associated with a significantly smaller decline in renal function compared with placebo in subjects across stages of impaired kidney function at baseline. Although benefits were observed in the overall population, the findings indicate that the primary benefit may be observed in those with established chronic kidney disease.
Available at: http://works.bepress.com/katherine-tuttle/369/