P-220. Real-World Effectiveness of Fecal Microbiota, live-jslm for the Prevention of Recurrent <i>Clostridioides difficile</i> Infection

Abstract Background Fecal microbiota, live-jslm (RBL) is a live biotherapeutic product approved by the FDA in November 2022 for the prevention of recurrence of Clostridioides difficile infection (rCDI) in adults. It is a rectally administered, pre-packaged single dose microbiome therapy, demonstrated to be safe and efficacious in clinical trials. There are few real-world studies of RBL use in routine clinical practice. This study reports effectiveness of RBL in an outpatient real-world setting. Methods Medical records of patients who were administered RBL within physician offices nationally were reviewed from February 2023 to March 2024. Data included patient demographics, comorbidities, rCDI history, risk factors and treatments, including standard of care antibiotic (SoC). Recurrence, defined as any occurrence of diarrhea with 3 liquid bowl movements or more within 24 hours, was assessed at 8 weeks post-RBL administration. Results RBL was administered to 64 patients from 32 physician offices. Patient characteristics are shown in Table 1. Patients had a median age of 75 (IQR: 64.8-82.3) years and were predominantly female (65.6%). Patients had multiple comorbidities (Charlson score 4.5; IQR: 3-7) and 59.4% had 2 or more rCDI risk factors. The most common risk factors were age ≥65 years (75%) and concurrent gastric acid suppressant use (59.4%). The median number of prior CDI episodes was 3 (IQR: 1-3). Fidaxomicin (57.8%) was the most utilized SoC antibiotic for treatment of CDI prior to administration of RBL. There were no adverse events reported with administration of RBL other than minor leakage during administration in 4 (6.2%). Eight-week follow-up was completed in 59 patients, of which 25% (n=15) experienced a recurrence of CDI. Conclusion This real-world study demonstrated that RBL treatment to prevent recurrence of CDI was safe and effective in routine clinical practice. Disclosures Richard L. Hengel, MD, Gilead: Grant/Research Support Timothy E. Ritter, MD, Abbvie: Advisor/Consultant|Boehringer Ingelheim: Advisor/Consultant|Bristol Myers Squibb/Celgene: Advisor/Consultant|Eli Lilly: Advisor/Consultant|Ferring: Advisor/Consultant|Ferring: Data Adjudication Committee|Genetech/Roche: Advisor/Consultant|Gilead: Advisor/Consultant|Intercept: Advisor/Consultant|Iterative Health: Advisor/Consultant|Janssen: Advisor/Consultant|Merck: Advisor/Consultant|Pfizer: Advisor/Consultant|Rebiotix: Data Adjudication Committee|Sanofi: Advisor/Consultant|Takeda Pharmaceuticals: Advisor/Consultant Jonathan A. Rosenberg, MD, Aimmune: Advisor/Consultant|Ferring Pharmaceuticals: Advisor/Consultant Lucinda J. Van Anglen, PharmD, Cumberland Pharmaceuticals: Grant/Research Support|Ferring Pharmaceuticals: Grant/Research Support|Novartis Pharmaceuticals: Grant/Research Support|Takeda Pharmaceuticals: Grant/Research Support Amy Guo, PhD, Ferring Pharmaceuticals, Inc.: Employee Mielad Moosapanah, PharmD, Ferring Pharmaceuticals: Employee Sanghyuk Seo, PharmD, MS, Ferring Pharmaceuticals, Inc.: Employee Kevin W. Garey, PharmD, MS, Acurx: Grant/Research Support