P3661 - Efficacy and Safety of Investigational Therapeutic Microbiome SER-109 in Recurrent Clostridioides difficile Infection: A Systematic Review

Harsimran Kalsi, MBBS¹, Stephanie P.. Fabara, MD¹, Akankcha Alok, MD², Mohammed Bhakit, MD², Sanil Thomas, MD^2
1University of Central Florida College of Medicine, Gainesville, FL; ²University of Central Florida, HCA Healthcare GME, Gainesville, FL

Introduction: Current therapies for recurrent Clostridioides difficile infection (CDI) often fail to address the disrupted microbiome contributing to C. difficile spore germination and subsequent toxin production. SER-109, an investigational therapeutic microbiome, is composed of purified Firmicutes spores and shows promise in treating recurrent CDI. Our aim was to evaluate the efficacy, safety and recurrence rate of CDI following administration of oral SER-109.

Methods: We systematically reviewed available literature on PUBMED using the Preferred Reporting Items for Systematic Reviews and Meta-Analysis (PRISMA) for clinical trials involving SER-109. We found three clinical trials that met our inclusion criteria and primary efficacy endpoint criteria. For assessing bias, we used the Cochrane Collaboration's tool risk assessment of the clinical trials (Figure 1).

Results: Oral SER-109 was well tolerated with the rate of recurrent CDI remaining low, regardless of the number of prior recurrences or patient demographics. The diagnostic approach did not significantly impact the beneficial effect of SER-109. In patients with symptom resolution of C. difficile infection after treatment with standard-of-care antibiotics, oral administration of SER-109 was superior to placebo in reducing the risk of recurrent infection. The observed safety profile of SER-109 was mild and similar to that of placebo. Our findings are summarized in Table 1.

Discussion: SER-109 holds promise as a safe and effective treatment for recurrent CDI. Further research is warranted to confirm its long-term efficacy and explore potential mechanisms underlying its impact on the disrupted gut microbiome.



Disclosures:


Harsimran Kalsi, MBBS¹, Stephanie P.. Fabara, MD¹, Akankcha Alok, MD², Mohammed Bhakit, MD², Sanil Thomas, MD². P3661 - Efficacy and Safety of Investigational Therapeutic Microbiome SER-109 in Recurrent <i>Clostridioides difficile</i> Infection: A Systematic Review, ACG 2024 Annual Scientific Meeting Abstracts. Philadelphia, PA: American College of Gastroenterology.