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Structure Therapeutics reported Monday that its oral GLP-1 drug led to weight loss in two small studies, leading shares to surge in pre-market trading.

In a 12-week Phase 2a study, the daily pill in a capsule formulation led to 6.2% placebo-adjusted weight loss. In a separate 12-week pharmacokinetics study, the company tested a new tablet formulation of the drug, called GSBR-1290, and it led to placebo-adjusted weight loss of up to 6.9%.

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Though it’s difficult to compare across different studies, the results appear to approach the levels of weight loss seen at 12 weeks in a separate Phase 2 study of Eli Lilly’s GLP-1 pill called orforglipron. That entire study lasted 36 weeks, but at 12 weeks, participants had about 6%-7% placebo-adjusted weight loss.

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