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Bimagrumab, an Activin Type II Receptor Antagonist, for the Treatment of Obesity and Type 2 Diabetes: A Randomized ClinicalTrial

Heymsfield, Steven, Coleman, Laura, Miller, Ram, Rooks, Daniel, Laurent, Didier, Petricoul, Olivier, Praestgaard, Jens, Swan, Therese, Wade, Thomas, Perry, Robert, Goodpaster, Bret and Roubenoff, Ronenn (2021) Bimagrumab, an Activin Type II Receptor Antagonist, for the Treatment of Obesity and Type 2 Diabetes: A Randomized ClinicalTrial. Journal of the American Medical Association.


Antibody blockade of the activin type II receptor (ActRII) signaling pathway stimulates skeletal muscle growth. Previous clinical studies suggest that ActRII inhibition with the human monoclonal antibody bimagrumab also promotes excess adipose tissue loss and improves insulin resistance.
This multicenter randomized study determined the efficacy and safety of bimagrumab on body
composition and glycemic control in adults with overweight and obesity and who had type 2 diabetes.
This was a double-blind, placebo-controlled 48-week phase 2 study.
Nine sites in the United States and United Kingdom participated in the study from February 2017 through May 2019.
Adults (n=75) with body mass index 28–40 kg/m2 64 who had type 2 diabetes and glycated hemoglobin levels 6.5%–10.0%.
Participants were randomized to intravenous bimagrumab or placebo every 4 weeks for 48 weeks. All patients received diet and exercise counseling.
The primary endpoint was least squares mean change from baseline (80% CI) to Week 48 in total body fat mass. Key secondary and exploratory endpoints included changes in lean mass, waist circumference, glycated hemoglobin, and body weight from baseline to Week 48.
At Week 48, 77.3% of patients completed the study. Total body fat mass decreased by 21% in
bimagrumab-treated patients vs 0.5% in those treated with placebo (P<0.001). Secondary endpoints for bimagrumab vs placebo included a lean mass increase of 3.6% vs a decrease of 0.8% (P<0.001); waist circumference decrease of 9.00 cm vs increase of 0.45 cm (P<0.001); glycated hemoglobin reduction of 0.76 percentage points vs 0.04 percentage points (P=0.005); and weight reduction of 6.5% vs 0.8% (P<0.001). Bimagrumab was safe and well-tolerated.
ActRII blockade with bimagrumab led to marked loss of total body fat, gain in lean mass, and metabolic improvements over 48 weeks in patients with overweight and obesity who had type 2 diabetes. ActRII pathway inhibition provides a novel approach for the pharmacologic management of excess adiposity and accompanying metabolic disturbances.
Funded by Novartis Pharmaceuticals; number, NCT03005288.

Item Type: Article
Keywords: Keywords are not required by journal
Date Deposited: 27 Jan 2021 00:45
Last Modified: 27 Jan 2021 00:45


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