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SER 155

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Drug Profile

SER 155

Alternative Names: SER-155

Latest Information Update: 25 Sep 2025

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At a glance

  • Originator Seres Therapeutics
  • Developer Memorial Sloan-Kettering Cancer Center; Seres Therapeutics
  • Class Bacteria
  • Mechanism of Action Bacteria replacements; Gastrointestinal microbiome modulators
  • Orphan Drug Status

    Orphan designation is assigned by a regulatory body to encourage companies to develop drugs for rare diseases.

    No
  • New Molecular Entity No
  • Available For Licensing Yes

Highest Development Phases

  • Phase I Bacteraemia; Enterocolitis; Graft-versus-host disease; Intra-abdominal infections

Most Recent Events

  • 23 Sep 2025 Seres Therapeutics receives feedback from the FDA for SER 155 in Bacteraemia
  • 06 Aug 2025 Seres Therapeutics submits a protocol for phase II trial in Bacteraemia to US FDA
  • 30 May 2025 Efficacy data from a phase Ib trial in Graft-versus-host-disease presented at the 61st Annual Meeting of the American Society of Clinical Oncology (ASCO-2025)

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