Cidara Therapeutics Presents Promising New Data on Novel Drug-Fc Conjugate Candidates at the American Association for Cancer Research (AACR) Annual Meeting 2024

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Cidara Therapeutics, Inc. (CDTX) announced promising preclinical data on its drug-Fc conjugate (DFC) immunotherapies at the AACR Annual Meeting. The multispecific CD73/PD-1 DFC showed improved tumor reduction over PD-1 monotherapy, CCR5-targeting DFC demonstrated efficacy in colorectal cancer, and CBO421 outperformed oleclumab in triple-negative breast cancer cell lines.
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The recent advancements in immunotherapies using drug-Fc conjugates (DFCs) represent a significant stride in oncology. The development of a multispecific CD73/PD-1 targeting DFC is particularly noteworthy due to its multivalent approach, combining a small molecule CD73 inhibitor with a PD-1 inhibitor peptide. This strategy could potentially overcome the limitations of monotherapies by simultaneously blocking multiple pathways that tumors exploit to evade the immune system.

Furthermore, the novel CBO421 DFC's ability to inhibit CD73 enzymatic activity and promote receptor internalization could offer a two-pronged mechanism to thwart tumor immune evasion. The comparison to oleclumab, an existing anti-CD73 monoclonal antibody, suggests that CBO421 may offer superior efficacy, which if translated clinically, could disrupt the current treatment landscape for triple-negative breast cancer.

The preclinical success of Cidara Therapeutics' DFCs could have substantial market implications. The potential improvement in treatment efficacy compared to current monotherapies addresses an unmet need in cancer treatment, particularly for patients with limited response to existing immune checkpoint inhibitors. The targeting of CCR5 in colorectal cancer, for instance, opens avenues for new therapeutic strategies in solid tumors.

Investors should monitor the progress of these candidates towards clinical trials, as positive outcomes could lead to significant shifts in market share within the oncology sector. The company's proprietary Cloudbreak platform appears to be an asset not only for the rapid development of these DFC candidates but also as a potential source of licensing revenue or strategic partnerships.

The intellectual property landscape around DFCs is critical for securing a competitive edge in the biotech industry. The proprietary nature of Cidara's Cloudbreak platform and the novelty of their DFC candidates could provide strong patent protection. This protection is paramount in safeguarding research investments and ensuring exclusivity in the market upon potential FDA approval.

However, the company must navigate the complex patent environment, which includes ensuring that their DFCs do not infringe on existing patents and that their own patents can withstand challenges. The robustness of their IP strategy could influence investor confidence and the company's valuation in the long term.

- Multispecific CD73/PD-1 DFC demonstrates improved tumor reduction compared to PD-1 monotherapy in nonclinical study

- CCR5-targeting DFC demonstrates potent efficacy in colorectal cancer mouse model

- Late-breaking CBO421 data demonstrates improved efficacy compared to oleclumab in human triple-negative breast cancer cell lines

SAN DIEGO, April 05, 2024 (GLOBE NEWSWIRE) -- Cidara Therapeutics, Inc. (Nasdaq: CDTX), a biotechnology company using its proprietary Cloudbreak® platform to develop drug-Fc conjugate (DFC) immunotherapies designed to save lives and improve the standard of care for patients facing serious diseases, announced the company will deliver four poster presentations, including one late-breaking poster presentation, at this year’s American Association for Cancer Research (AACR) Annual Meeting being held April 5-10, 2024 at the San Diego Convention Center in San Diego, California. The presentations highlight data on the company’s multispecific CD73/PD-1 drug Fc-conjugate (DFC), its CCR5-targeting DFC, and CBO421, its lead oncology DFC candidate targeting CD73.

“The preclinical data highlighted in our presentations at this year’s AACR meeting show the promise of our first-in-class or best-in-class DFCs to potentially improve treatment for a variety of cancers,” said Jeffrey Stein, Ph.D., president and chief executive officer at Cidara. “Our Cloudbreak platform has quickly produced DFC candidates effective in preclinical studies across various cancers with specific disease targets. This week, we are sharing data on our CCR5 DFC program for the first time, which has demonstrated robust efficacy as a monotherapy in mouse models of colorectal cancer. Targeting CCR5 has the potential to improve response rates to immune checkpoint inhibitor therapies, which could have a greater impact for patients unresponsive to these current treatment options. Additionally, our multispecific CD73/PD-1-targeting DFC and CBO421, our lead CD73-targeting DFC, continue to demonstrate antitumor efficacy, and we look forward to further advancing these candidates toward the clinic.”

Presentation details are summarized below:

Abstract Title: Discovery of a multispecific CD73/PD-1 targeting Drug Fc-Conjugate (DFC), which improves tumor reduction compared to PD-1 monotherapy in a humanized mouse model
Presenter: James Levin, Ph.D.
Date and Time: Monday, April 8, 2024, 1:30-5:00 PM PT
Key Highlights:

  • First-in-class CD73/PD-1 targeting DFC is comprised of a multivalent conjugate of a small molecule CD73 inhibitor stably linked to a proprietary human IgG1 Fc-fusion with a PD-1 inhibitor peptide
  • Multispecific DFC demonstrated potent inhibition of tumor growth in a humanized mouse model and was more potent than PD-1 monotherapy

Abstract Title: CBO421, a novel drug Fc-conjugate, inhibits the enzymatic activity of CD73 and triggers CD73 internalization
Presenters: Elizabeth Abelovski and Nicholas Dedeic
Date and Time: Monday, April 8, 2024, 9:00 AM-12:30 PM PT
Key Highlights:

  • CD73 is a cell surface enzyme responsible for the production of adenosine, which is immunosuppressive and leads to immune evasion in solid tumors
  • Adenosine production can be inhibited therapeutically by enzyme inhibition and receptor internalization and subsequent degradation
  • In human triple-negative breast cancer cell lines, CBO421 demonstrated potent and complete CD73 enzyme inhibition and robust CD73 receptor internalization in CD73 cancer cells, superior to oleclumab, an anti-CD73 monoclonal antibody

Abstract Title: CBO421: A novel drug Fc-conjugate to prevent tumor immune evasion via the CD73/adenosine pathway
Presenters: Amanda Almaguer and Doug Zuill
Date and Time: Monday, April 8, 2024, 1:30-5:00 PM PT
Key Highlights:

  • CBO421 demonstrated strong binding affinity and potent inhibition of both soluble and membrane bound CD73, differentiating it from monoclonal antibody CD73 inhibitors
  • The candidate also exhibited high potency in functional cell-based assays and robust antitumor efficacy in a syngeneic mouse model

Abstract Title: CCR5-001, a novel Drug Fc-Conjugate (DFC) targeting CCR5, demonstrates potent efficacy in a colorectal cancer mouse model
Presenter: Simon Döhrmann, Ph.D.
Date and Time: Monday, April 8, 2024, 1:30-5:00 PM PT
Key Highlights:

  • CCR5 is expressed on multiple immune cells and can contribute to an immune-suppressive tumor microenvironment, limiting response to immune checkpoint inhibitors
  • First-in-class CCR5-targeting DFC, CCR5-001, demonstrated potent CCR5 binding and functional inhibition of CCR5 signaling in cell-based assays
  • The candidate also demonstrated robust efficacy as a monotherapy in a syngeneic colorectal cancer mouse model, representing a potential to target CCR5 with DFCs in solid cancers where pathology is driven by the CCR5/CCL5 axis

About Cidara Therapeutics
Cidara Therapeutics is using its proprietary Cloudbreak® platform to develop novel drug-Fc conjugates (DFCs). These targeted immunotherapies offer the unique opportunity to create “single molecule cocktails” comprised of targeted small molecules and peptides coupled to a human antibody fragment (Fc). DFCs are designed to save lives and improve the standard of care for patients facing cancers and other serious diseases by inhibiting specific disease targets while simultaneously engaging the immune system. In addition, Cidara received FDA approval for REZZAYO™ (rezafungin for injection), which it has licensed to multiple partners to commercialize in the U.S. and ex-U.S. Cidara is headquartered in San Diego, California. For more information, please visit

Forward-Looking Statements
This release contains “forward-looking statements” within the meaning of Section 27A of the Securities Act of 1933, as amended, and Section 21E of the Securities Exchange Act of 1934, as amended, and such forward-looking statements are made pursuant to the safe harbor provisions of the Private Securities Litigation Reform Act of 1995. “Forward-looking statements” describe future expectations, plans, results, or strategies and are generally preceded by words such as “anticipates,” “believe,” “could,” “expect,” “may,” “plan” or “will”. Forward-looking statements in this release include, but are not limited to, statements related to whether nonclinical data generated for the multispecific CD73/PD-1 targeting DFC or any other conjugate will be predictive of activity in humans, whether a CCR% inhibitor DFC will have a benefit when combined with a checkpoint inhibitor therapy, and whether any oncology DFC will progress to further nonclinical or clinical development. Such statements are subject to a multitude of risks and uncertainties that could cause future circumstances, events, or results to differ materially from those projected in the forward-looking statements. These and other risks are identified under the caption “Risk Factors” in Cidara’s Annual Report on Form 10-K for the fiscal year ended December 31, 2022, and other filings subsequently made with the Securities and Exchange Commission. All forward-looking statements contained in this press release speak only as of the date on which they were made and are based on management’s assumptions and estimates as of such date. Cidara does not undertake any obligation to publicly update any forward-looking statements, whether as a result of the receipt of new information, the occurrence of future events or otherwise.

Brian Ritchie
LifeSci Advisors
(212) 915-2578

Veronica Eames
LifeSci Communications
(646) 970-4682


What did Cidara Therapeutics announce at the AACR Annual Meeting?

Cidara Therapeutics announced promising preclinical data on its drug-Fc conjugate (DFC) immunotherapies.

How did the multispecific CD73/PD-1 DFC perform compared to PD-1 monotherapy?

The multispecific CD73/PD-1 DFC showed improved tumor reduction compared to PD-1 monotherapy.

What efficacy did the CCR5-targeting DFC demonstrate?

The CCR5-targeting DFC demonstrated potent efficacy in a colorectal cancer mouse model.

How did CBO421 perform in human triple-negative breast cancer cell lines compared to oleclumab?

CBO421 outperformed oleclumab in human triple-negative breast cancer cell lines.

Cidara Therapeutics, Inc.


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