- FB301 was safe and well tolerated in healthy female subjects, with all primary and secondary endpoints met
- Clinically meaningful microbiome modulation observed, including significant improvement up to 6-month follow-up
- Results support progression into Phase 2, with FDA IND clearance granted in the US and CTA approved in Germany
COPENHAGEN, Denmark and BOSTON, April 16, 2026 (GLOBE NEWSWIRE) -- Freya Biosciences (“Freya” or “the Company”), a clinical-stage immunology company developing therapies to treat inflammation and immune dysregulation in women, today announces positive topline results from its Phase 1 first-in-human clinical study evaluating FB301, a defined multi-strain Lactobacillus consortium developed using Freya’s DyscoverTM platform which enables in human discovery, as a potential treatment for IVF-related embryo implantation failure.
The Phase 1 trial was a randomized, placebo-controlled, double-blind, single-center, first-in-human trial investigating safety, tolerability, and proof-of-concept following single and multiple dosing with FB301 in healthy female subjects aged 18-45. A total of 129 participants were enrolled, of whom 89 were randomized across three dosing cohorts at a single study site in Germany. Participants received either a single vaginal capsule of FB301 (Cohort 1), once-daily dosing for five days (Cohort 2), or once-daily dosing for ten days (Cohort 3).
The study met all primary and secondary endpoints, demonstrating that FB301 was safe and well tolerated across all cohorts, with no serious adverse events (SAEs), severe adverse events, or discontinuations reported.
Colleen Acosta, Chief Executive Officer of Freya Biosciences, commented: “FB301 showed a favorable safety profile across all dose levels and demonstrated clinically meaningful microbiome changes, including increases in key Lactobacillus species in the vaginal environment that are associated with superior health outcomes. Taken together, the data support the proposed mechanism of action of resolving a dysbiotic vaginal microbiome and addressing underlying inflammation, providing a strong foundation for clinical development in women undergoing assisted reproductive technologies. As we advance into Phase 2, our focus will be on confirming these findings in patient populations and progressing the development of a much-needed new therapeutic option that could help improve outcomes for the millions of women undergoing IVF worldwide.”
Treatment with FB301 resulted in a significant increase from baseline in the relative abundance of selected Lactobacillus species in vaginal samples, indicating modulation of the vaginal microbiome toward a more advantageous state. In participants who were dysbiotic at baseline (the modified intention-to-treat population), treatment with FB301 led to conversion to a Lactobacillus-dominant microbiome profile across all dosing cohorts. At the 6-month follow-up, 50.0% (11/22) of participants in the highest dose group (Cohort 3) had converted to a non-dysbiotic profile, compared with 11.1% (1/9) in the placebo group. Statistical analyses confirmed significant increases in Lactobacillus abundance versus baseline across treatment arms (p < 0.001), with additional pooled analyses supporting treatment effects compared to placebo.
Johan van Hylckama Vlieg, Chief Scientific Officer of Freya Biosciences, added: "We are encouraged that FB301 met the secondary endpoint of improving Lactobacillus abundance compared to placebo, without the need for antibiotic pretreatment. The study further demonstrated durable engraftment of FB301 product strains, validating our Dyscover™ platform for the discovery of therapeutic candidates that correct local immune dysregulation – a mechanism critical to reproductive health."
Freya is advancing FB301 into Phase 2 clinical development to evaluate its potential in women undergoing assisted reproductive technologies including frozen embryo transfer, as well as in a bacterial vaginosis (BV) population to further optimize the treatment regimen. An Investigational New Drug (IND) application has been cleared by the FDA for a US study in women undergoing frozen embryo transfer (NCT07453069), and a Clinical Trial Application (CTA) has been approved in Germany for a BV treatment optimization study (NCT07481955).
For further information, please contact:
Optimum Strategic Communications
Mary Clark, Isabelle Abdou, Katie Flint, Aoife Minihan
Tel: +44 (0) 203 922 0889
Email: freya@optimumcomms.com
About Freya Biosciences
Freya Biosciences is a clinical-stage immunology company developing therapies treating inflammation and immune dysregulation in conditions that affect women. Freya is advancing a diversified pipeline, including two first-in-class Phase 2-ready assets for IVF-related embryo implantation failure and preterm birth.
Freya’s science is powered by its DyscoverTM platform, a unique multi-omics data science platform built on a biobank of 1,000+ patient samples, including intervention data at scale. This provides deep insights into disease pathway associated markers, allowing for de-risked target identification and patient stratification.
Backed by a world-class team with a proven track record in biologics drug development, and supported by an international investor base, including Sofinnova Partners, the Gates Foundation, OMX Ventures, EIFO, and Angelini Ventures, Freya is addressing a critical gap in women's health, developing disease-modifying therapies for patients with conditions where current treatments fall short. For more information, visit our website and follow Freya on LinkedIn.
