SAN DIEGO, CA, USA I March 07, 2023 I Cidara Therapeutics, Inc. (NASDAQ: CDTX), a biotechnology company developing long-acting therapeutics designed to help improve the standard of care for patients facing serious diseases, presented preclinical data on a CD73-targeting drug-Fc conjugate (DFC) candidate, CBO-212, from the Company’s Cloudbreak® platform, at the ESMO Targeted Anticancer Therapies Congress (ESMO TAT) in Paris, March 6-8, 2023.

“The preclinical data presented at ESMO TAT represent important progress for Cidara in oncology, as these nonclinical results are the first supporting the anti-tumor potential of a Cloudbreak product candidate,” said Jeffrey Stein, Ph.D. president and chief executive officer of Cidara. “We are initially focused on CD73 due to its documented contribution to immune evasion through the production of immune-suppressive adenosine in the tumor microenvironment.   We believe that a CD73-targeted DFC, which combines positive attributes of small molecule and monoclonal antibody inhibitors, has the potential to ultimately provide a meaningful solution for patients.”

The presented preclinical studies evaluated the functional activity, internalization and inhibition of CD73 by CBO-212 in both cell-free and cell-based assays. Key highlights include:

  • CBO-212 inhibited cell-anchored and soluble forms of CD73, both of which can contribute to immune-suppressive adenosine production in the tumor microenvironment, whereas positive control CD73 inhibitor monoclonal antibodies (mAbs) currently in clinical development acted primarily on cell-anchored CD73.
  • CBO-212 restored activation of human peripheral blood mononuclear cells suppressed with adenosine monophosphate to a greater extent than the mAb comparators, and similar to the small molecule inhibitors tested.
  • Unlike tested small molecule inhibitors currently in development, the multivalent presentation of CD73 inhibitors on CBO-212 induced receptor internalization and subsequent reduction of CD73 receptors expressed on a human breast cancer cell line.
  • These attributes, coupled with the long half-life mediated by the DFC Fc domain, led to significant tumor reduction in a mouse syngeneic tumor model after a single dose of CBO-212.

Cidara is currently advancing its lead CD73-targeting product candidate, CD421, which is an enhanced version of CBO-212 that confers reduced immunogenic properties.

About Cloudbreak® DFCs
Cidara is developing a new generation of immunotherapeutic agents from its Cloudbreak platform that couple targeted small molecule and peptide drugs to a human antibody fragment (Fc). These highly potent, long-acting drug-Fc conjugates (DFCs) are designed to inhibit specific disease targets while simultaneously engaging the immune system. In addition to multiple oncology programs, Cidara is advancing its antiviral DFC CD388 through Phase 1 and Phase 2a clinical trials in partnership with Janssen for the universal prevention and treatment of influenza. Cidara is also advancing DFC programs to target other life-threatening viruses, such as SARS-CoV-2.

About Cidara Therapeutics
Cidara is developing long-acting therapeutics designed to improve the standard of care for patients facing serious diseases. The Company’s portfolio is comprised of new approaches aimed at transforming existing treatment and prevention paradigms, first with its lead Phase 3 antifungal candidate, rezafungin, in addition to drug-Fc conjugates (DFCs) targeting viral and oncological diseases from Cidara’s proprietary Cloudbreak® platform. Cidara is headquartered in San Diego, California. For more information, please visit

SOURCE: Cidara Therapeutics