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DATA GRAPHICS | Data Byte

Where Metsera’s data fit in the obesity landscape

MET-097i’s 14.1% weight loss competitive at 28 weeks; tolerability and dosing frequency could also help it differentiate

October 3, 2025 11:54 PM UTC

New Phase IIb data from Metsera’s GLP-1R agonist MET-097i raise the possibility of a best-in-class profile across efficacy, safety and dosing interval, underscoring why Pfizer agreed to pay heavily to acquire the biotech.

On Monday, Metsera Inc. (NASDAQ:MTSR) announced initial results from the 239-patient Phase IIb VESPER-1 study, showing once-weekly MET-097i, at the highest dose of 1.2 mg, led to placebo-adjusted weight loss of 14.1% after 28 weeks of treatment. An exploratory analysis at 36 weeks showed continued weight loss, indicating its efficacy had not yet plateaued...