On May 11, 2024 Replicate Bioscience, a clinical-stage company pioneering novel self-replicating RNA (srRNA) technology for use across a range of infectious disease, oncology, autoimmune disease indications and beyond, reported new preclinical data and today will share interim clinical trial results from an ongoing Phase 1 study at the American Society of Gene & Cell Therapy (ASGCT) (Free ASGCT Whitepaper) Annual Meeting, May 7-11 in Baltimore, Maryland (Press release, Replicate Bioscience, MAY 11, 2024, View Source;cell-therapy-asgct-annual-meeting-302142558.html [SID1234643103]).

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"At ASGCT (Free ASGCT Whitepaper), Replicate is presenting two important breakthroughs in srRNA technology," said Nathaniel Wang, Ph.D., CEO of Replicate. "For vaccines, our clinical data demonstrate the induction of protective levels of immunity at doses significantly lower than any other reported mRNA or srRNA vaccine. This potency, combined with a best-in-class safety profile, demonstrates the capability of our technology to greatly expand the utility of RNA technology for vaccines. Beyond vaccines, further improvements to our library of vectors now enable us to control and prolong in vivo production of therapeutic proteins compared to circular RNA, linear mRNA, and current state-of-the art srRNA, opening up therapeutic areas such as immunology and metabolic disease."

RBI-4000’s Phase 1 results will be presented on Saturday, May 11 at 10:15 a.m. ET by Replicate’s Chief Medical Officer, Zelanna Goldberg, M.D., in an oral presentation titled "Single and Low Dose Self-Replicating RNA Vaccine Provides Effective Immune Protection Against Rabies in Healthy Volunteers." The results highlight the strong immunogenicity and favorable safety profile of RBI-4000 in the Phase 1 trial, which is the first clinical validation of Replicate’s next-generation srRNA technology. Additional takeaways are as follows:

Day 85 datasets for all cohorts met the WHO-established surrogate of protection at doses significantly lower than any other reported RNA-based vaccines;
Substantive majority of participants achieved metric in all dose cohorts.
In the previously unreported 10 mcg dose cohorts:
100% of participants achieved surrogate of protection after two vaccine doses.
92% of participants achieved surrogate of protection after a single vaccine dose.
Safety data from the interim dataset demonstrate RBI-4000 was well tolerated with no severe adverse events across all cohorts; reactogenicity was transient and self-limiting.
No dose limiting toxicity (DLT) was observed; maximum tolerated dose (MTD) has not been reached, enabling further dose escalation.
On May 9, Parinaz (Paris) Aliahmad, Ph.D., Head of Research and Development at Replicate, delivered an oral presentation at ASGCT (Free ASGCT Whitepaper) titled "Novel Self-Replicating RNA Vectors Broaden Therapeutic Window and Expand Use Outside of Vaccines." The results underscore the broad potential of srRNA as a new treatment modality across a wide range of disease areas. Additional takeaways are as follows:

Vaccines using Replicate’s optimized vectors achieve protective immunity at ultra-low doses (1 picogram) with minimal reactogenicity.
Beyond vaccines, Replicate’s novel srRNA vectors demonstrate >100-fold increased expression of encoded proteins and improved durability compared to circular RNA, linear mRNA vectors, and current state-of-the-art srRNA technologies.
Replicate’s novel srRNA vectors can expand utility of RNA technology for templated expression of biotherapeutic proteins for applications outside of vaccines, in areas such as immune disorders, metabolic disease, and cancers.