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Even with positive efficacy signals, the stock dropped ~11% on the news, suggesting the market priced in execution risk, uncertainty about regulatory path, and the typical risk profile for biotech Phase 2 data; such reactions are common when readouts are early and not yet tied to a clear commercialization path.
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Seres Therapeutics reports SER-155 achieved the primary endpoint with an 80% immunosuppressive-free response by Day 15 and 33% complete remission. Biomarker data showed reductions in fecal calprotectin and albumin by Day 43, supporting continued development. Despite positive data, MCRB shares declined about 11% on the news, indicating a cautious near-term reception while longer-term durability and safety readouts remain key catalysts.
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