– 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, CA, USA I March 18, 2024 I 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).

SOURCE: CytomX Therapeutics