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Safety and Tolerability of SER-109 as an Investigational Microbiome Therapeutic in Adults With Recurrent Clostridioides difficile Infection: A Phase 3, Open-Label, Single-Arm Trial.
Sims, MD, Khanna, S, Feuerstadt, P, Louie, TJ, Kelly, CR, Huang, ES, Hohmann, EL, Wang, EEL, Oneto, C, Cohen, SH, et al
JAMA network open. 2023;6(2):e2255758
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Clostridioides difficile infection (CDI) is most commonly caused by treatment with broad-spectrum antibiotics. Antibiotic treatment of CDI is generally successful but recurrences of CDI occur in 15-25% of patients after the first episode, and up to 40% of patients with a previous recurrence. This is thought to be due to persistent microbiome disruption, including a depletion of Firmicutes bacteria. The aim of this single-arm, open-label trial was to evaluate the safety and effectiveness of an investigational, microbiome therapeutic composed of purified Firmicutes spores (SER-109) to prevent CDI recurrences. 263 patients were enrolled in the study and received SER-109 on 3 consecutive days, started within 4 days of completion of antibiotic treatment for CDI recurrence. Follow-up was 24 weeks. Most patients were aged 65 years or older and had a high prevalence of comorbidities. There were no reports of serious adverse events which were considered related to SER-109. By week 24, 36 patients (13.7%) had experienced a CDI recurrence. This was independent of demographics, type of antibiotic treatment and number of prior recurrences. The authors concluded that the data suggest a role of SER-109 in the management of recurrent CDI.
Abstract
IMPORTANCE A safe and effective treatment for recurrent Clostridioides difficile infection (CDI) is urgently needed. Antibiotics kill toxin-producing bacteria but do not repair the disrupted microbiome, which promotes spore germination and infection recurrence. OBJECTIVES To evaluate the safety and rate of CDI recurrence after administration of investigational microbiome therapeutic SER-109 through 24 weeks. DESIGN, SETTING, AND PARTICIPANTS This phase 3, single-arm, open-label trial (ECOSPOR IV) was conducted at 72 US and Canadian outpatient sites from October 2017 to April 2022. Adults aged 18 years or older with recurrent CDI were enrolled in 2 cohorts: (1) rollover patients from the ECOSPOR III trial who had CDI recurrence diagnosed by toxin enzyme immunoassay (EIA) and (2) patients with at least 1 CDI recurrence (diagnosed by polymerase chain reaction [PCR] or toxin EIA), inclusive of their acute infection at study entry. INTERVENTIONS SER-109 given orally as 4 capsules daily for 3 days following symptom resolution after antibiotic treatment for CDI. MAIN OUTCOMES AND MEASURES The main outcomes were safety, measured as the rate of treatment-emergent adverse events (TEAEs) in all patients receiving any amount of SER-109, and cumulative rates of recurrent CDI (toxin-positive diarrhea requiring treatment) through week 24 in the intent-to-treat population. RESULTS Of 351 patients screened, 263 were enrolled (180 [68.4%] female; mean [SD] age, 64.0 [15.7] years); 29 were in cohort 1 and 234 in cohort 2. Seventy-seven patients (29.3%) were enrolled with their first CDI recurrence. Overall, 141 patients (53.6%) had TEAEs, which were mostly mild to moderate and gastrointestinal. There were 8 deaths (3.0%) and 33 patients (12.5%) with serious TEAEs; none were considered treatment related by the investigators. Overall, 23 patients (8.7%; 95% CI, 5.6%-12.8%) had recurrent CDI at week 8 (4 of 29 [13.8%; 95% CI, 3.9%-31.7%] in cohort 1 and 19 of 234 [8.1%; 95% CI, 5.0%-12.4%] in cohort 2), and recurrent CDI rates remained low through 24 weeks (36 patients [13.7%; 95% CI, 9.8%-18.4%]). At week 8, recurrent CDI rates in patients with a first recurrence were similarly low (5 of 77 [6.5%; 95% CI, 2.1%-14.5%]) as in patients with 2 or more recurrences (18 of 186 [9.7%; 95% CI, 5.8%-14.9%]). Analyses by select baseline characteristics showed consistently low recurrent CDI rates in patients younger than 65 years vs 65 years or older (5 of 126 [4.0%; 95% CI, 1.3%-9.0%] vs 18 of 137 [13.1%; 95% CI, 8.0%-20.0%]) and patients enrolled based on positive PCR results (3 of 69 [4.3%; 95% CI, 0.9%-12.2%]) vs those with positive toxin EIA results (20 of 192 [10.4%; 95% CI, 6.5%-15.6%]). CONCLUSIONS AND RELEVANCE In this trial, oral SER-109 was well tolerated in a patient population with recurrent CDI and prevalent comorbidities. The rate of recurrent CDI was low regardless of the number of prior recurrences, demographics, or diagnostic approach, supporting the beneficial impact of SER-109 for patients with CDI. TRIAL REGISTRATION ClinicalTrials.gov identifier: NCT03183141.
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Longitudinal Study of the Psoriasis-Associated Skin Microbiome during Therapy with Ustekinumab in a Randomized Phase 3b Clinical Trial.
Loesche, MA, Farahi, K, Capone, K, Fakharzadeh, S, Blauvelt, A, Duffin, KC, DePrimo, SE, Muñoz-Elías, EJ, Brodmerkel, C, Dasgupta, B, et al
The Journal of investigative dermatology. 2018;138(9):1973-1981
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Chronic plaque psoriasis is an immune-mediated disease of the skin and joints. A growing appreciation of the role of the innate immune system in psoriasis pathogenesis stems from the prominent role of inflammatory cytokines and cells associated with innate immunity in the disease and associations observed between psoriasis and genetic variations involved in innate immunity. The aim of this study was to assess changes of the skin microbiome in the setting of a longitudinal phase 3b study of patients receiving up to 2 years of ustekinumab therapy. Results show that prior to treatment, there were minor, body-site specific differences in microbial diversity and composition when comparing lesional with non-lesional skin. Microbial heterogeneity was greater in lesional skin than non-lesional skin. During ustekinumab treatment, the composition of microbiota diverged further between lesional and non-lesional skin across body sites. The divergence observed between lesional and non-lesional skin during ustekinumab treatment varied by body site. Authors conclude that their findings may help inform future study design and it may also have medically relevant implications for diagnostics and therapeutics involving the skin microbiome.
Abstract
Plaque psoriasis, a chronic inflammatory disease primarily affecting the skin, is thought to have a multifactorial etiology, including innate immune system dysregulation, environmental triggers, and genetic susceptibility. We sought to further understand the role of skin microbiota in psoriasis pathogenesis, as well as their response to therapy. We systematically analyzed dynamic microbiota colonizing psoriasis lesions and adjacent nonlesional skin in 114 patients prior to and during ustekinumab treatment in a phase 3b clinical trial. By sequencing the bacterial 16S ribosomal RNA gene from skin swab samples obtained at six anatomical sites, we identified minor, site-specific differences in microbial diversity and composition between pretreatment lesional and nonlesional skin. During therapy, microbial communities within lesional and nonlesional skin diverged, and body-site dispersion increased, reflecting microbial skin site-specificity. Microbiota demonstrated greater pretreatment heterogeneity in psoriatic lesions than in nonlesional skin, and variance increased as treatment progressed. Microbiota colonizing recurrent lesions did not overlap with pretreatment lesional microbiota, suggesting colonization patterns varied between initial and recurrent psoriatic lesions. While plaque psoriasis does not appear to be associated with specific microbes and/or microbial diversity, this large dataset provides insight into microbial variation associated with (i) disease in different body locations, (ii) initial versus recurrent lesions, and (iii) anti-IL12/23 therapy.