Effects of weight loss from oral semaglutide administration on cardiometabolic risk factors in Japanese patients with type 2 diabetes: a retrospective analysis using propensity score matching

Background: Obesity is increasingly being recognized as a chronic disease that exacerbates type 2 diabetes and its related complications. Oral semaglutide, a novel glucagon-like peptide-1 (GLP-1) receptor agonist, has demonstrated efficacy in weight loss and diabetes control in Western populations. However, in real-world clinical practice, its effectiveness in Japanese patients, who typically exhibit a leaner phenotype and unique genetic susceptibilities affecting insulin secretion, remains unclear. Methods: We retrospectively evaluated the electronic medical records of 313 patients treated with oral semaglutide and 11,239 untreated controls at the Keio University School of Medicine. We performed propensity score matching to adjust for covariates, including age, sex, height, weight, blood pressure, blood test data, medications, and compared the cardiometabolic risk factors, including HbA1c, blood pressure, lipids, and liver function 180 days post-treatment, of both patient groups. We conducted a subgroup analysis for patients who achieved ≥ 3% weight loss. Results: After propensity score matching, the semaglutide group demonstrated significantly better outcomes for HbA1c reduction and weight loss and improvements in systolic blood pressure (SBP), low-density lipoprotein cholesterol (LDL-C), and liver function than the control group. Subgroup analysis of patients with ≥ 3% weight loss revealed superior HbA1c improvements in the semaglutide group; however, no significant differences in other metabolic parameters, such as SBP, LDL-C, and liver function, were observed. Conclusion: Oral semaglutide effectively improved metabolic markers in Japanese patients with type 2 diabetes, similar to that in Western populations. Weight loss itself was suggested to significantly contribute to blood pressure, lipid levels, and liver function changes.