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Comparing once-weekly semaglutide to incretin-based therapies in patients with type 2 diabetes: a systematic review
B M Mishriky1, D M Cummings2, J R Powell3
1Department of Internal Medicine, East Carolina University, Greenville, NC, USA.
Aims:
Our aim was to compare once-weekly semaglutide to incretin-based therapies - defined as either dipeptidyl peptidase-4 inhibitors (DPP-4i) or other glucagon-like peptide-1 receptor agonist (GLP-1RA) - in patients with type 2 diabetes.
Methods:
We searched for randomized trials comparing once-weekly semaglutide to other incretin-based therapies in patients with type 2 diabetes. We pooled trials that compared semaglutide to other GLP-1RA together, and those comparing semaglutide to DPP-4i together. The primary outcome was the change in haemoglobin A1c over time.
Results:
Five trials met our inclusion criteria. There was a significantly greater reduction in haemoglobin A1c favouring semaglutide when compared to other GLP-1RA or DPP-4i [MD (95% CI) = -0.38% (-0.62, -0.15) and -1.14% (-1.53, -0.75) respectively]. There was a significantly greater weight loss favouring semaglutide when compared to other GLP-1RA or DPP-4i [MD (95% CI) = -2.50 kg (-3.91, -1.09) and -3.19 kg (-3.66, -2.72) respectively]. The proportion of patients achieving glycaemic goals and goal weight loss was greater in semaglutide-treated patients when compared to either other GLP-1RA or DPP-4i. However, semaglutide-treated patients had a significantly higher incidence of gastrointestinal side effects.
Conclusions:
While both once-weekly semaglutide and other incretin-based therapies can reduce haemoglobin A1c, semaglutide causes a more potent haemoglobin A1c reduction and greater weight loss when compared to other incretin-based therapies. However, this potent effect of semaglutide was associated with a higher incidence of gastrointestinal side effects. Additional studies are needed to determine whether this marked reduction in both haemoglobin A1c and body weight may translate into improved cardiovascular outcomes.
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