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Cidara Therapeutics Announces New Clinical and Preclinical Data for Rezafungin and Influenza AVCs from the European Congress of Clinical Microbiology and Infectious Diseases (ECCMID)
Abstract Book highlights new data from Cidara accepted for presentation at ECCMID 2020
Phase 2 trial shows superiority of rezafungin in time to clear deadly infection
Seven abstracts highlight new data on influenza antiviral conjugates (AVCs) from Cloudbreak® antiviral platform
"We appreciate the decision of the ECCMID 2020 organizers to publish the abstract book to communicate important scientific results at a time when our collective efforts are focused on dealing with COVID-19,” said
Three of the published abstracts detail new findings related to rezafungin, Cidara’s novel, Phase 3, once-weekly echinocandin being developed for the treatment and prophylaxis of invasive fungal disease. Copies of the abstracts can be accessed on the Publications section of the Cidara website. Data highlights from the published abstracts on rezafungin are as follows:
- Analysis of the complete STRIVE Phase 2 trial (Parts A and B) results demonstrate that a single dose of rezafungin had a Day 5 success rate (resolution of clinical signs of infection + mycological eradication) of 62.3% versus 55.7% for the approved echinocandin comparator, caspofungin, dosed once-daily. Moreover, the time to negative blood culture in the rezafungin-treated patients was statistically faster than that in caspofungin treated patients. These findings show early efficacy of rezafungin and support front-loaded plasma exposure as a pharmacometric determinant of efficacy.
- A second analysis from Parts A and B of the STRIVE Phase 2 trial demonstrate that outcomes following treatment with rezafungin were comparable between the North American and European patients.
- Preclinical data in a rabbit model of Candida endophthalmitis show treatment with rezafungin significantly lowered fungal burden as compared to micafungin, an echinocandin approved for the treatment of Candida infection, voriconazole, an azole for the treatment of Candida infection, and vehicle control in multiple tissues of the eye. The rezafungin treated group was the only one to demonstrate no eye lesions following treatment.
Seven of the published abstracts detail new findings around Cidara’s Cloudbreak antiviral platform candidate, CD377, for the prevention and treatment of influenza. Copies of the abstracts can be accessed on the Publications section of the Cidara website. Data highlights from the published abstracts on Cidara’s lead antiviral conjugate (AVC) CD377 are as follows:
- Preclinical in vitro and in vivo data highlight CD377’s tolerability and stability. CD377 was stable and intact after incubations in mouse and human plasma and human hepatocytes. In the mouse, rat, and monkey, the half-life of CD377 was five to 10 days with high bioavailability (77%) observed after subcutaneous or intramuscular administration. A two-week toxicology study in monkeys showed no adverse effect on body weight, clinical chemistry, hematology, coagulation, cytokines or urinalysis.
- Single doses of CD377 in a lethal mouse model of influenza A showed a greater decrease in lung viral burden and cytokine levels compared to oseltamivir dosed for 5 days, twice daily at 10X the human equivalent dose. Treatment with one dose of CD377 two hours post-infection resulted in a dose-dependent reduction in viral burden in the lungs four days post-infection, which correlated with a dose-dependent reduction in inflammatory cytokines.
- Additional preclinical data show that mice treated with single, low doses of CD377 are protected in lethal challenge models with several seasonal influenza subtypes. A single CD377 dose resulted in complete recovery from lethal challenge with several influenza strains.
- CD377 fully protected immune-competent and severely immunodeficient mice with similar doses in lethal influenza challenge models. Immune-competent mice treated with CD377 fully recovered by the end of the study (day 14), while vehicle mice succumbed to infection by day 6. Varying doses of CD377 protected immune-compromised mice challenged with the same virus for the duration of the 28-day study. Immune-compromised mice treated with baloxavir reached 40% mortality after 28 days.
- Preclinical in vitro data show lower resistance potential of CD377 compared to approved influenza treatments, baloxavir and oseltamivir, against a pandemic strain of influenza. Over the course of 10 serial passages, there was no increase in viral titer in the presence of CD377, in contrast to a 2.5 log increase in viral titer at six and eight passages with baloxavir and oseltamivir, respectively.
- Additional preclinical in vitro data indicate that CD377 has potent, broad-spectrum antiviral activity encompassing seasonal, pandemic and drug resistant influenza A strains, as well as both lineages of influenza B. Its ability at a low dose to inhibit an essential enzyme on the surface of the influenza virus, neuraminidase, was superior to approved influenza treatments, oseltamivir and zanamivir, and comparable or superior to baloxavir.
- CD377 also induces, as designed, a robust immune response against cells infected with multiple strains of seasonal and pandemic influenza. CD377 induced potent induction of mechanisms of cell-mediated immune defense, antibody-dependent cellular cytotoxicity and antibody-dependent cellular phagocytosis through its Fc-mediated interaction with Fcg receptors.
The abstract book is published online and freely accessible on ECCMID’s website.
Rezafungin is a novel once-weekly echinocandin being developed for both the treatment and prophylaxis of severe fungal infections, such as candidemia and invasive candidiasis. The structure and properties of rezafungin were specifically designed to improve upon a clinically validated mechanism, enhancing its efficacy and safety potential for patients. Cidara is currently conducting a Phase 3 clinical trial with rezafungin for the first-line treatment of candidemia and/or invasive candidiasis (ReSTORE trial). The Company is also advancing a second Phase 3 clinical trial of once-weekly rezafungin for prophylaxis against invasive fungal infections in patients undergoing allogeneic blood and marrow transplantation (ReSPECT trial).
About Cloudbreak AVCs
Cidara is developing a new generation of immunotherapeutic antivirals from its Cloudbreak antiviral platform that couple potent antivirals to a human antibody fragment. These long-acting, antiviral conjugates (AVCs) directly inhibit viral replication while simultaneously engaging the immune system. AVCs are initially being studied for the prevention and treatment of the seasonal and pandemic influenza, with the potential to deliver universal protection for an entire flu season with a single dose. Cidara is also advancing preclinical and discovery AVC programs to target additional life-threatening viruses, including HIV, parainfluenza, RSV and coronaviruses, including COVID-19.
Cidara is developing therapeutics to improve the standard of care for patients facing serious fungal or viral infections. The Company’s portfolio is comprised of breakthrough approaches aimed at transforming existing treatment and prevention paradigms, first with its lead Phase 3 antifungal candidate, rezafungin, in addition to antiviral conjugates (AVCs) targeting influenza and other viral diseases from Cidara’s proprietary Cloudbreak antiviral platform. Cidara is headquartered in
Statements contained in this press release regarding matters that are not historical facts are "forward-looking statements" within the meaning of the Private Securities Litigation Reform Act of 1995. Because such statements are subject to risks and uncertainties, actual results may differ materially from those expressed or implied by such forward-looking statements. Such statements include, but are not limited to, whether we can successfully develop rezafungin and differentiate it from existing therapies, whether we will be successful in identifying novel approaches to prevent and treat viral infections using our Cloudbreak antiviral platform, whether we will be able to continue the development of our AVCs, including CD377, and whether we will be successful in developing a product for universal single-dose influenza protection, or at all. Risks that contribute to the uncertain nature of the forward-looking statements include: the success and timing of Cidara’s clinical trials; regulatory developments in
Karen O’Shea, Ph.D.
Source: Cidara Therapeutics, Inc.