Keros Halts Some Dosing in Cibotercept Trial

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Keros Therapeutics has halted some dosing in a Phase 2 clinical trial of cibotercept (KER-012) in combination with background therapy in patients with pulmonary arterial hypertension (PAH) due to unexpected adverse events. The decision to stop dosing 3mg/kg and 4.5mg/kg treatment arms in the ongoing TROPOS trial comes after a safety review due to the “unanticipated observation of pericardial effusion adverse events in the trial,” the company says.

“We are working diligently to gain a better understanding of these unanticipated findings,” the company says, adding that it discussing the findings with FDA and other regulatory authorities. “The TROPOS trial is fully enrolled, and dosing in the 1.5 mg/kg treatment arm remains ongoing following completion of a risk and benefit assessment of the data from the ongoing trial that was conducted by the independent Data Monitoring Committee followed by a select group of unblinded individuals at Keros,” it says.

Cibotercept is described as being designed to bind to and inhibit the signaling of TGF-β ligands that stimulate smooth muscle hypertrophy and fibrosis, including activin A, activin B and myostatin. Keros believes the drug has the potential to increase the signaling of bone morphogenic protein (BMP) pathways through this inhibition to treat diseases such as PAH that are associated with reduced BMP signaling.

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