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CytomX Therapeutics Announces Milestone Achievement in PROBODY® T-Cell Engaging Bispecific (TCB) Collaboration with Astellas

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CytomX Therapeutics initiates GLP toxicology study triggering a $5 million milestone payment from Astellas for the first clinical candidate in their collaboration. The program is part of a larger alliance focusing on T-cell engaging bispecifics, with CytomX retaining US co-commercialization rights for certain programs.
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The initiation of a GLP toxicology study by CytomX Therapeutics and the subsequent milestone payment from Astellas is a noteworthy development for investors. The $5 million inflow is a non-dilutive capital source that can bolster CytomX's financial position. It's important to evaluate this in the context of the company's cash burn rate and runway. An influx of capital at this stage can extend the company's operational capabilities without the need for immediate additional fundraising, which could be dilutive to current shareholders.

Moreover, the financial terms of the CytomX-Astellas partnership, including future milestone payments and co-commercialization options, could provide a stream of revenue if the clinical candidate proceeds successfully through the development pipeline. This milestone is a tangible validation of the PROBODY platform's potential, which may have a positive effect on investor sentiment and the company's valuation.

From a medical research perspective, the progression of the PROBODY T-cell engaging bispecific (TCB) into GLP toxicology studies is a critical step forward. This phase is essential for assessing the safety profile of the candidate before entering human clinical trials. The PROBODY platform aims to localize T-cell activity to the tumor microenvironment, potentially reducing systemic toxicity and improving efficacy in cancer treatment.

Understanding the science behind PROBODY TCBs is vital. These molecules are engineered to remain inactive in healthy tissue and become activated in the presence of specific cancerous conditions, which could revolutionize targeted therapies. The successful development of such therapies can lead to significant market opportunities, as well as partnerships or acquisition interests from larger pharmaceutical companies seeking innovative oncology treatments.

The strategic alliance between CytomX and Astellas reflects a broader industry trend where biotechnology firms collaborate with larger pharmaceutical companies to leverage mutual strengths. CytomX's retention of co-commercialization rights in the U.S. for certain programs indicates a confidence in their technology and a desire to maintain a stake in the potentially lucrative U.S. market.

Investors should consider the competitive landscape of T-cell engaging bispecifics and how CytomX's PROBODY platform differentiates itself. The ability to engineer conditionally activated therapies could provide CytomX with a competitive edge in a crowded oncology market. Long-term, the success of these programs could lead to significant market share in the cancer treatment space, provided the clinical outcomes are favorable and the treatments gain regulatory approval.

- Initiation of GLP toxicology study for the first clinical candidate in the collaboration triggers a $5 million milestone payment to CytomX -

- Program is one of several ongoing collaboration projects in broad CytomX-Astellas alliance on T-cell engaging bispecifics -

- CytomX retains option for US co-commercialization and economic rights for certain programs -

SOUTH SAN FRANCISCO, Calif., March 18, 2024 (GLOBE NEWSWIRE) -- CytomX Therapeutics, Inc. (Nasdaq: CTMX), a leader in the field of conditionally activated, localized biologics, today announced that the first clinical candidate in its TCB agreement with Astellas has entered into GLP toxicology studies which triggers a $5 million payment to CytomX. The clinical candidate is the first PROBODY® TCB molecule under this alliance to progress into a GLP toxicology study. CytomX and Astellas are also collaborating on additional conditionally activated TCB programs with CytomX eligible to receive future preclinical, clinical and commercial milestones. CytomX retains a cost share and co-commercialization option on a select number of targets.

“We are excited by the continued momentum towards a potential future IND for the first PROBODY® TCB clinical candidate in our collaboration with Astellas, and we continue to partner with Astellas on multiple preclinical programs. The progress with this collaboration highlights the benefits of our strategy to create value through both wholly-owned and partnered programs, as well as the potential of our expanding pipeline of PROBODY T-cell engagers which are designed to localize T-cell activity to the tumor microenvironment,” said Sean McCarthy, D.Phil., chief executive officer and chairman of CytomX Therapeutics.

About CytomX Therapeutics
CytomX is a clinical-stage, oncology-focused biopharmaceutical company focused on developing novel conditionally activated biologics designed to be localized to the tumor microenvironment. By pioneering a novel pipeline of localized biologics, powered by its PROBODY® therapeutic platform, CytomX’s vision is to create safer, more effective therapies for the treatment of cancer. CytomX’s robust and differentiated pipeline comprises therapeutic candidates across multiple treatment modalities including antibody-drug conjugates (“ADCs”), T-cell engagers, and immune modulators such as cytokines. CytomX’s clinical-stage pipeline includes CX-904, CX-2051 and CX-801. CX-904 is a conditionally activated T-cell-engaging antibody targeting the epidermal growth factor receptor (EGFR) on tumor cells and the CD3 receptor on T cells and partnered with Amgen in a global co-development alliance. CX-2051 is a conditionally activated ADC directed toward epithelial cell adhesion molecule, EpCAM, with potential applicability across multiple EpCAM-expressing epithelial cancers. CX-801 is an interferon alpha-2b PROBODY® cytokine with broad potential applicability in traditionally immuno-oncology sensitive as well as insensitive (cold) tumors. CytomX has established strategic collaborations with multiple leaders in oncology, including Amgen, Astellas, Bristol Myers Squibb, Regeneron and Moderna. For more information about CytomX and how it is working to make conditionally activated treatments the new standard-of-care in the fight against cancer, visit www.cytomx.com and follow us on LinkedIn and X (formerly Twitter).

CytomX Therapeutics Forward-Looking Statements
This press release includes forward-looking statements. Such forward-looking statements involve known and unknown risks, uncertainties and other important factors that are difficult to predict, may be beyond our control, and may cause the actual results, performance, or achievements to be materially different from any future results, performance or achievements expressed or implied in such statements, including those related to the future potential of partnerships or collaboration agreements. Accordingly, you should not rely on any of these forward-looking statements, including those relating to the potential benefits, safety and efficacy or progress of CytomX’s or any of its collaborative partners’ product candidates, including CX-2051, CX-801, and CX-904, the potential benefits or applications of CytomX’s PROBODY® therapeutic platform, CytomX’s or its collaborative partners’ ability to develop and advance product candidates into and successfully complete clinical trials, including the ongoing and planned clinical trials of CX-904, and the timing of the commencement of clinical trials or initial and ongoing data availability for CX-801 and CX-2051, and other development milestones. Risks and uncertainties that contribute to the uncertain nature of the forward-looking statements include: the unproven nature of CytomX’s novel PROBODY® therapeutic technology; CytomX’s clinical trial product candidates are in the initial stages of clinical development and its other product candidates are currently in preclinical development, and the process by which preclinical and clinical development could potentially lead to an approved product is long and subject to significant risks and uncertainties, including the possibility that the results of preclinical research and early clinical trials may not be predictive of future results; the possibility that CytomX’s clinical trials will not be successful; the possibility that current preclinical research may not result in additional product candidates; CytomX’s dependence on the success of CX-904, CX-801, and CX-2051; CytomX’s reliance on third parties for the manufacture of the Company’s product candidates; possible regulatory developments in the United States and foreign countries; and the risk that we may incur higher costs than expected for research and development or unexpected costs and expenses. Additional applicable risks and uncertainties include those relating to our preclinical research and development, clinical development, and other risks identified under the heading "Risk Factors" included in CytomX’s Annual Report on Form 10-K filed with the SEC on March 11, 2024. The forward-looking statements contained in this press release are based on information currently available to CytomX and speak only as of the date on which they are made. CytomX does not undertake and specifically disclaims any obligation to update any forward-looking statements, whether as a result of any new information, future events, changed circumstances or otherwise.

PROBODY is a U.S. registered trademark of CytomX Therapeutics, Inc.

Investor Contact:
Chris Ogden
SVP, Finance and Accounting
cogden@cytomx.com

Investor and Media Contact:
Stern Investor Relations
Stephanie Ascher
stephanie.ascher@sternir.com 


The initiation of GLP toxicology studies for the first clinical candidate in their collaboration triggered the payment.

The first clinical candidate is a PROBODY® TCB molecule.

CytomX retains the option for US co-commercialization and economic rights for certain programs.

Sean McCarthy, D.Phil., is the chief executive officer and chairman of CytomX Therapeutics.
CytomX Therapeutics, Inc.

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About CTMX

cytomx is an oncology-focused biopharmaceutical company pioneering a novel class of investigational antibody therapeutics based on its probody technology platform. the company uses the platform to create development-stage proprietary cancer immunotherapies against clinically-validated targets, as well as to develop first-in-class investigational cancer therapeutics against novel targets. cytomx believes that its probody platform has the potential to improve the combined efficacy and safety profile of monoclonal antibody modalities, including cancer immunotherapies, antibody drug conjugates and t-cell-recruiting bispecific antibodies. probody therapeutics are designed to take advantage of unique conditions in the tumor microenvironment to enhance the tumor-targeting features of an antibody and reduce drug activity in healthy tissues. investigational probody therapeutics are being developed that address clinically-validated cancer targets in immuno-oncology, such as pd-l1 against which o