Efficacy and safety of semaglutide 2.4 mg for weight loss in overweight or obese adults without diabetes: An updated systematic review and meta-analysis including the 2-year STEP 5 trial

The blood pressure-lowering property of subcutaneous semaglutide: a systematic review, meta-analysis, and meta-regression

PURPOSE

Semaglutide is a glucagon-like peptide (GLP1) receptor agonist with unprecedented weight-lowering and anti-hyperglycemic properties. Recent clinical trials reported that subcutaneous semaglutide can modulate blood pressure; however, its effect on blood pressure widely varied in different studies and different subgroups of patients.

METHODS

PubMed, Web of Science, Scopus, and the Cochrane Library were systematically searched from the inception to July 18, 2024. Due to high heterogeneity, a random-effects model was adopted to pool data.

RESULTS

Twenty clinical trials with 15,312 participants in the placebo group and 18,231 participants in the semaglutide group were included in this study. Subcutaneous semaglutide significantly decreased both systolic (WMD - 3.71 mmHg, 95% CI (-4.29, -3.13), I2: 50.2%) and diastolic (WMD - 1.10 mmHg, 95% CI (-1.58, -0.63), I2: 69.7%) blood pressure. Subgroup analyses indicated that the blood pressure-lowering property of subcutaneous semaglutide was greater among patients without diabetes, with lower baseline hemoglobin A1c (HbA1c), baseline body mass index (BMI) greater than 35 kg/m2, dose of semaglutide more than 1 mg/week, baseline systolic blood pressure equal or less than 130 mmHg, weight loss greater than 10 kg, and BMI reduction greater than 3 kg/m2. In addition, a treatment length of 50 to 100 weeks was associated with greater blood pressure-lowering effects in subgroup analysis. After adjusting for other factors, meta-regression revealed that placebo-adjusted weight change was independently correlated with the effect of semaglutide on systolic and diastolic blood pressure.

CONCLUSION

Subcutaneous semaglutide can significantly decrease systolic and diastolic blood pressure, particularly in selected groups of patients.

Efficacy and safety of tirzepatide versus placebo in overweight or obese adults without diabetes: a systematic review and meta-analysis of randomized controlled trials

BACKGROUND

Tirzepatide was approved to treat type 2 diabetes and obesity, but its efficacy and safety in patients without diabetes has not been investigated.

AIM

This meta-analysis aimed to evaluate the efficacy and safety of tirzepatide compared to placebo in overweight or obese patients without diabetes.

METHOD

PubMed, Embase and Cochrane were searched on January 18, 2024. Randomized controlled trials (RCTs) that used tirzepatide in overweight or obese adults without diabetes were included. Efficacy outcomes included the proportion of participants achieving weight loss targets, changes in body weight (%), body mass index (BMI), waist circumference (WC), and blood pressure (BP). Safety outcomes were commonly reported adverse events. Standardized mean differences (SMD) or odds ratios (OR) with 95% confidence intervals (CIs) were used for continuous and dichotomous outcomes, respectively.

RESULTS

Three RCTs with 3901 participants were included. Tirzepatide was associated with increased proportion of participants achieving weight loss targets, reduced body weight (SMD - 1.61, 95% CI - 2.20 to - 1.02), BMI (SMD - 2.13, 95% CI - 3.08 to - 1.18), WC (SMD - 0.91, 95% CI - 1.14 to - 0.69), and BP versus placebo. However, the risk of adverse events such as nausea (OR 4.26, 95% CI 2.60 to 3.81), vomiting (OR 8.35, 95% CI 5.19 to 13.45), and diarrhea (OR 3.57, 95% CI 2.80 to 4.57) was significantly higher for tirzepatide versus placebo.

CONCLUSION

Tirzepatide significantly reduced weight and improved metabolic markers among overweight or obese without diabetes. However, increased adverse events highlights the need for benefits versus risks assessment before initiation and continuous monitoring.

Why does GLP-1 agonist combined with GIP and/or GCG agonist have greater weight loss effect than GLP-1 agonist alone in obese adults without type 2 diabetes?

Obesity is a chronic condition demanding effective treatment strategies, among which pharmacotherapy plays a critical role. As glucagon-like peptide-1 (GLP-1) agonist approved by the Food and Drug Administration (FDA) for long-term weight management in adults with obesity, liraglutide and semaglutide have great weight loss effect through reducing food intake and delaying gastric emptying. The emergence of unimolecular polypharmacology, which utilizes single molecules to simultaneously target multiple receptors or pathways, marked a revolutionary improvement in GLP-1-based obesity pharmacotherapy. The dual agonist tirzepatide activates both GLP-1 and glucose-dependent insulinotropic polypeptide (GIP) receptors and has shown enhanced potency for weight loss compared to conventional GLP-1 mono agonist. Furthermore, emerging data suggests that unimolecular GLP-1/glucagon (GCG) dual agonist, as well as GLP-1/GIP/GCG triple agonist, may offer superior weight loss efficacy over GLP-1 agonist. This review summarizes the comprehensive mechanisms underlying the pronounced advantages of GLP-1/GIP dual agonist, GLP-1/GCG dual agonist and GLP-1/GIP/GCG triple agonist over GLP-1 mono agonist in weight reduction in obese adults without type 2 diabetes. A deeper understanding of these unimolecular multitargeting GLP-1-based agonists will provide insights for their clinical application and guide the development of new drugs for obesity treatment.

Obesity and cardiovascular disease: an ESC clinical consensus statement

The global prevalence of obesity has more than doubled over the past four decades, currently affecting more than a billion individuals. Beyond its recognition as a high-risk condition that is causally linked to many chronic illnesses, obesity has been declared a disease per se that results in impaired quality of life and reduced life expectancy. Notably, two-thirds of obesity-related excess mortality is attributable to cardiovascular disease. Despite the increasingly appreciated link between obesity and a broad range of cardiovascular disease manifestations including atherosclerotic disease, heart failure, thromboembolic disease, arrhythmias, and sudden cardiac death, obesity has been underrecognized and sub-optimally addressed compared with other modifiable cardiovascular risk factors. In the view of major repercussions of the obesity epidemic on public health, attention has focused on population-based and personalized approaches to prevent excess weight gain and maintain a healthy body weight from early childhood and throughout adult life, as well as on comprehensive weight loss interventions for persons with established obesity. This clinical consensus statement by the European Society of Cardiology discusses current evidence on the epidemiology and aetiology of obesity; the interplay between obesity, cardiovascular risk factors and cardiac conditions; the clinical management of patients with cardiac disease and obesity; and weight loss strategies including lifestyle changes, interventional procedures, and anti-obesity medications with particular focus on their impact on cardiometabolic risk and cardiac outcomes. The document aims to raise awareness on obesity as a major risk factor and provide guidance for implementing evidence-based practices for its prevention and optimal management within the context of primary and secondary cardiovascular disease prevention.

Adult obesity treatment and prevention: A trans-agency commentary on the research landscape, gaps, and future opportunities

Given the high and growing prevalence of obesity among adults in the United States, obesity treatment and prevention are important topics in biomedical and public health research. Although researchers recognize the significance of this problem, much remains unknown about safe and effective prevention and treatment of obesity in adults. In response to the worsening obesity epidemic and the many unknowns regarding the disease, a group of key scientific and program staff members of the National Institutes of Health (NIH) and other federal and non-government agencies gathered virtually in September 2021 to discuss the current state of obesity research, research gaps, and opportunities for future research in adult obesity prevention and treatment. The current article synthesizes presentations given by attendees and shares their organizations' current initiatives and identified gaps and opportunities. By integrating the information discussed in the meeting and current initiatives, we identify potential targets and overlapping priorities for future research, including health equity and disparities in obesity, the heterogeneity of obesity, and the use of technological and innovative approaches in interventions.

Obesity and cardiovascular disease: an ESC clinical consensus statement

The global prevalence of obesity has more than doubled over the past four decades, currently affecting more than a billion individuals. Beyond its recognition as a high-risk condition that is causally linked to many chronic illnesses, obesity has been declared a disease per se that results in impaired quality of life and reduced life expectancy. Notably, two-thirds of obesity-related excess mortality is attributable to cardiovascular disease. Despite the increasingly appreciated link between obesity and a broad range of cardiovascular disease manifestations including atherosclerotic disease, heart failure, thromboembolic disease, arrhythmias, and sudden cardiac death, obesity has been underrecognized and sub-optimally addressed compared with other modifiable cardiovascular risk factors. In the view of major repercussions of the obesity epidemic on public health, attention has focused on population-based and personalized approaches to prevent excess weight gain and maintain a healthy body weight from early childhood and throughout adult life, as well as on comprehensive weight loss interventions for persons with established obesity. This clinical consensus statement by the European Society of Cardiology discusses current evidence on the epidemiology and aetiology of obesity; the interplay between obesity, cardiovascular risk factors and cardiac conditions; the clinical management of patients with cardiac disease and obesity; and weight loss strategies including lifestyle changes, interventional procedures, and anti-obesity medications with particular focus on their impact on cardiometabolic risk and cardiac outcomes. The document aims to raise awareness on obesity as a major risk factor and provide guidance for implementing evidence-based practices for its prevention and optimal management within the context of primary and secondary cardiovascular disease prevention.

Therapeutic Advances in Obesity: How Real-World Evidence Impacts Affordability Beyond Standard of Care

Obesity is currently considered a global epidemic, with rising prevalence worldwide and rather pessimistic projections. Based on its close interconnection with various co-morbidities, such as diabetes mellitus and cardiovascular disease, obesity is associated with significant increases in morbidity and mortality, while it also poses a substantial economic burden for national healthcare systems. Apparently, the majority of individuals classified as obese do not achieve adequate weight loss with the adoption of a healthy lifestyle intervention, including dietary modification and physical activity. Fortunately, during the last decade, a significant progress in pharmacotherapy of obesity has been observed, with the introduction of agents that have gained approval from regulatory authorities, namely semaglutide, liraglutide and tirzepatide, due to their impressive results in body weight reduction, alongside their beneficial, pleiotropic effects. The aim of the present review article is to discuss on evidence retrieved from real-world studies regarding the efficacy of those agents in obesity treatment, with emphasis on cost-effectiveness data, towards an effort to tackle efficiently the progression of obesity epidemic.

Effects of Semaglutide in Doxorubicin-Induced Cardiac Toxicity in Wistar Albino Rats

Background

Doxorubicin (DOX) is used to treat various types of cancers. However, its use is restricted by cardiotoxicity, a leading cause of morbidity and mortality. Glucagon-like peptide 1 receptor agonists (GLP-1 RAs) may be associated with cardioprotective properties.

Purpose

This study aims to determine the protective effects of different semaglutide (SEM) doses on DOX-induced cardiotoxicity in a rat model.

Methodology

Thirty-five female Wistar rats were divided into five groups. The first group received distilled water as a negative control (NC); the positive control (PC) group received distilled water plus DOX; the third group (SL) received a low dose of SEM (0.06 mg/kg) plus DOX; the fourth group (SM) received a moderate dose of SEM (0.12 mg/kg) plus DOX; and the fifth group (SH) received a high dose of SEM (0.24 mg/kg) plus DOX. Blood samples were collected on day 8 to assess serum troponin, lactate dehydrogenase (LDH), creatine phosphokinase (CPK), total lipid profile, and vascular cell adhesion molecule 1 (VCAM-1). Cardiac tissue was sent for histopathological analysis.

Results

DOX increased the total cholesterol (TC), low-density lipoprotein (LDL), triglyceride (TG), LDH, and CKP levels. Moderate and high doses of semaglutide significantly reduced serum cholesterol levels (*p = 0.0199), (**p = 0.0077), respectively. A significant reduction (***p = 0.0013) in total body weight after treatment with SEM was observed in the SL group and a highly significant reduction (****p < 0.0001) was observed in the SM and SH groups. SEM at all doses reduced CPK levels. The SL group showed a significant reduction in troponin level (*p=0.0344). Serum LDH levels were reduced by all three SEM doses. The histopathological findings support the biochemical results.

Conclusion

Semaglutide may possess cardioprotective properties against DOX-induced cardiotoxicity in a rat model by decreasing serum biochemical markers of cardiotoxicity.

Efficacy and Safety of Once-Weekly Subcutaneous Semaglutide in Overweight or Obese Adults: A Systematic Review with Meta-Analysis

BACKGROUND

To evaluate the efficacy and safety of once-weekly subcutaneous semaglutide treatment in overweight or obese patients without type 2 diabetes.

METHODS

Randomized clinical trials that assessed the impact of once-weekly semaglutide on body weight and safety outcomes in overweight or obese patients were retrieved from PubMed, EMBASE, and Lilacs up to November 2023. Risk of bias was assessed with RoB 2.0, and certainty of evidence (CoE) with GRADE. A random-effects meta-analysis was conducted.

RESULTS

Ten publications, with 22.155 patients, were included. Semaglutide decreased relative body weight (MD: -11.80; 95%CI: -13.53 to -10.07; CoE: High), absolute body weight (MD: -11.58; 95%CI: -13.25 to -9.90; CoE: High) and BMI (MD: -4.15; 95%CI: -4.85 to -3.45; CoE: High). Semaglutide also increased the proportion of patients who achieved 5%, 10%, and 15% of weight loss ([weight loss≥5%: RR 2.29, 95% CI: 1.88 to 2.80; CoE: High]; [weight loss≥10%: RR 4.54, 95% CI: 3.45 to 5.98; CoE: High]; [weight loss≥15%: RR 8.29, 95%CI: 5.54 to 12.39; CoE: High]). Semaglutide leads to small risk to adverse events (RR: 1.03; 95%CI: 1 to 1.06; CoE: High), no difference in the serious adverse events (RR: 1.07; 95%CI: 0.70 to 1.62; CoE: Low), but increases in the risk to discontinued treatment (RR: 2.03; 95%CI: 1.87 to 2.20; CoE: High) and gastrointestinal adverse events (RR: 3.26; 95%CI: 1.99 to 5.34; CoE: Moderate).

CONCLUSION

This up-to-date systematic review highlights that once-weekly semaglutide treatment resulted in clinically important weight loss, becoming a promising adjuvant therapy for obesity.

An Assessment of Semaglutide Safety Based on Real World Data: From Popularity to Spontaneous Reporting in EudraVigilance Database

Some glucagon-like peptide-1 receptor agonists (GLP-1 RAs), first used in the treatment of type 2 diabetes mellitus (T2DM), have been approved for the treatment of obesity in patients with or without T2DM (liraglutide-LIR, semaglutide-SEM, and tirzepatide-TIR). Social media had an important influence on the off-label use of GLP-1 RAs for obesity, especially for SEM. We analyzed the Google queries related to SEM to assess people's interest in this drug. We also investigated the occurrence of adverse drug reactions (ADRs) by searching the EudraVigilance database (EV) for Individual Case Safety Reports (ICSRs) that reported SEM as the suspected drug and performed a descriptive and a disproportionality analysis. The data obtained for SEM were compared to other GLP-1 RAs. SEM had the highest proportions of searches on Google associated with the term "weight loss" and presented the lowest number of severe ADRs, but it also had the highest number of ICSRs reported in EV. Even though no unexpected safety issues have been reported for it until now, SEM has a hi3gh tendency for overdose reports. The most frequent off-label use was reported for SEM and TIR. In order to lower the risks of ADRs, the off-label use should be reduced and carefully monitored.

The maintenance of long-term weight loss after semaglutide withdrawal in obese women with PCOS treated with metformin: a 2-year observational study

Background

Withdrawal of semaglutide is frequently followed by weight regain due to compensatory biological changes that prevent the maintenance of long-term weight loss. There are some studies implying that metformin might attenuate weight regain. The weight trajectory after discontinuation of short-term semaglutide treatment in obese women with PCOS who continued metformin treatment has not yet been evaluated.

Aims

We explored changes in body weight, cardiometabolic and endocrine parameters in obese women with PCOS who continued treatment with metformin 2 years after discontinuation of short-term intervention with semaglutide.

Methods

25 women with PCOS and obesity, aged 33.7 ± 5.3 years (mean ± SD), were treated with once-weekly subcutaneous semaglutide 1.0 mg as an adjunct to metformin 2000 mg/day and lifestyle intervention for 16 weeks. At week 16, semaglutide was discontinued. Treatment with metformin 2000 mg/day and promotion of lifestyle intervention were continued during the 2-year follow-up period. Weight change, cardiometabolic, and endocrine parameters were assessed 2 years after semaglutide discontinuation.

Results

During semaglutide treatment phase, weight decreased from 101 (90-106.8) kg to 92 (83.3-100.8) kg. Two years after semaglutide withdrawal, weight was 95 (77-104) kg. The net weight loss 2 years after discontinuation of semaglutide remained significant when compared to baseline (p=0.003). At the end of the study, 21 out of 25 subjects had lower body weight compared to baseline. Improvements in cardiometabolic parameters including decrease in total and LDL cholesterol, fasting glucose, and glucose after OGTT that had been seen during semaglutide-treatment phase reverted towards baseline two years after semaglutide cessation. Free testosterone levels significantly decreased during semaglutide treatment from 6.16 (4.07-9.71) to 4.12 (2.98-6.93) nmol/l, (p= 0.012) and did not significantly deteriorate after semaglutide discontinuation.

Conclusion

Two years after semaglutide withdrawal, women with PCOS who continued with metformin regained about one-third of the semaglutide-induced weight loss. At the end of the follow up, 84% of women had a lower body weight than at baseline.

Glucagon-like Peptide-1 Receptor Agonists Associated Gastrointestinal Adverse Events: A Cross-Sectional Analysis of the National Institutes of Health All of Us Cohort

BACKGROUND

Glucagon-like peptide-1 receptor agonists (GLP-1 RAs) are commonly used diabetes and obesity medications but have been associated with gastrointestinal (GI) adverse events. However, real-world evidence on comparative GI adverse reaction profiles is limited.

OBJECTIVES

This study aimed to evaluate GI adverse events among GLP-1 RA users and compare semaglutide, dulaglutide, liraglutide, and exenatide safety regarding the GI adverse reaction profile.

METHODS

This retrospective cross-sectional analysis utilized real-world data on 10,328 adults with diabetes/obesity in the National Institutes of Health All of Us cohort. New GLP-1 RA users were identified, and GI adverse events were examined. Logistic regression determined factors associated with GI adverse events.

RESULTS

The mean age of the study population was 61.4 ± 12.6 years, 65.7% were female, 51.3% were White, and they had a high comorbidity burden. Abdominal pain (57.6%) was the most common GI adverse event, followed by constipation (30.4%), diarrhea (32.7%), nausea and vomiting (23.4%), GI bleeding (15.9%), gastroparesis (5.1%), and pancreatitis (3.4%). Dulaglutide and liraglutide had higher rates of abdominal pain, constipation, diarrhea, and nausea and vomiting than semaglutide and exenatide. Liraglutide and exenatide had the highest pancreatitis (4.0% and 3.8%, respectively). Compared to semaglutide, dulaglutide and liraglutide had higher odds of abdominal pain, and nausea and vomiting. They also had higher odds of gastroparesis than semaglutide. No significant differences existed in GI bleeding or pancreatitis risks between the GLP-1 RAs.

CONCLUSIONS

In this real-world cohort, GI adverse events were common with GLP-1 RAs. Differences in GI safety profiles existed between agents, with exenatide appearing safer than other GLP-1 RAs, except for gastroparesis. These findings can inform GLP-1 RA selection considering GI risk factors. Further studies are needed to evaluate the causal relationship and GLP-1 RA safety with concomitant medication use.