Do GLP-1s Lower VTE Risk in People With Type 2 Diabetes?

Glucagon-like peptide 1 (GLP-1) receptor agonists led to a significant reduction in the risk for venous thromboembolism (VTE) among individuals with type 2 diabetes compared with dipeptidyl peptidase 4 (DPP-4) inhibitors, a recent analysis indicated.

Overall, GLP-1 agonist use was associated with a 20% reduction in VTE compared with DPP-4 inhibitor use in those with type 2 diabetes, and this benefit held regardless of people’s obesity status, said study investigator Cho-Han Chiang, MD, a medical resident at Mount Auburn Hospital, in Cambridge, Massachusetts, who presented the findings at the American Society of Hematology (ASH) 2024 Annual Meeting.

The incidence of VTE has increased by 20% over the past 10 years, and obesity is a risk factor for VTE, Chiang explained. A growing body of evidence demonstrated that GLP-1s provide a variety of cardiovascular benefits in people with type 2 diabetes, but data on VTE benefits remain more limited.

In the retrospective study, the researchers combed electronic health records from the TriNetX global database, which includes more than 250 million patients, and identified adults with type 2 diabetes who were taking a GLP-1 agonist or a DPP-4 inhibitor.

After excluding anyone with prior VTE or atrial fibrillation as well as those treated with both drugs or with oral anticoagulants, patients on GLP-1s were matched with those on DPP-4 inhibitors based on predetermined variables, including age, sex, race, body mass index (BMI), A1c, use of other antidiabetic agents, and underlying comorbidities. VTE was a composite of pulmonary embolism and deep vein thrombosis.

The researchers also performed a subgroup analysis that stratified patients by obesity status, defined as a BMI ≥ 30.

Within 1 year of GLP-1 or DPP-4 prescription, VTE occurred at a rate of 6.5 cases/1000 person-years in the GLP-1 group vs 7.9 cases/1000 person years in the DPP-4 inhibitor group (hazard ratio [HR], 0.80; P 

The 20% risk reduction in VTE held across various subgroups of BMI, including among those with obesity, Chiang reported.

Among patients with the highest BMI (≥ 40), VTE occurred at a rate of 7.2 cases/1000 person years in the GLP-1 group vs 9.6 cases/1000 person years in the DPP-4 inhibitor group (HR, 0.74). Among patients with the next highest BMI (30-34.9), VTE occurred at a rate of 4.8 cases/1000 person years in the GLP-1 group vs 7.9 cases/1000 person years in the DPP-4 inhibitor group (HR, 0.60). Among those with the lowest BMI (18.5-24.9), VTE occurred significantly less frequently among those in the GLP-1 group — 4.7 cases/1000 person years vs 7.4 cases/1000 person years in the DPP-4 inhibitor group (HR, 0.61).

The lower risk for VTE associated with GLP-1s also held across the individual components of the composite VTE. Pulmonary embolism occurred at a rate of 3.1 cases/1000 person years in the GLP-1 group vs 3.9 cases/1000 person years in the DPP-4 inhibitor group (HR, 0.78), and deep vein thrombosis occurred in 4.2 cases/1000 person years in the GLP-1 group vs 5.0 cases/1000 person years in the DPP-4 inhibitor group (HR, 0.82).

Interestingly, the GLP-1 and DPP-4 curves started diverging within the first 30 days of the index prescription date, said Chiang.

Session moderator Ghadeer Dawwas, PhD, told Medscape Medical Newsthat patients with type 2 diabetes are increasingly using GLP-1 agonists because of the cardiovascular benefits associated with the agents, which include lower risks for stroke and heart failure, but the antithrombotic benefits are still debated.

“The current study indicates that GLP-1 agonists may help lower the risk of VTE in patients with type 2 diabetes, irrespective of their baseline body weight,” said Dawwas, a pharmacoepidemiologist and assistant professor of medicine at Vanderbilt University Medical Center in Nashville, Tennessee. “However, given the current landscape of evidence and the existence of conflicting data on VTE risk, clinicians should proceed with caution and await further studies to validate these findings before making clinical decisions.”

This study was funded by the National Blood Clot Alliance and Conquer Cancer Foundation.

Chiang and Dawwas had no disclosures.

Kate Johnson is a Montreal-based freelance medical journalist who has been writing for more than 30 years about all areas of medicine.