Caroline Kimberly Pocher's questions to Seres Therapeutics Inc (MCRB) leadership • Q1 2025
Question
Caroline Kimberly Pocher, on behalf of Tessa Romero, inquired if partnership discussions for SER-155 are dependent on developmental milestones like protocol submission, and asked for details on the powering assumptions and adaptive design of the upcoming Phase 2 study.
Answer
President and CEO Eric Shaff clarified that securing a partnership is the primary gating item for initiating the SER-155 study, although progress is being made in parallel on operational readiness and FDA interactions. Regarding the study design, Eric Shaff and SVP of Clinical Development Dr. Dennis Walling explained that while specific powering statistics are not being shared, the Phase 2 study will be well-powered and its data could be part of a future submission. The adaptive design includes an interim analysis after about 12 months, intended to provide an early look at efficacy and facilitate earlier discussions with the FDA about a potential Phase 3 trial.