On March 16, 2026 CytomX Therapeutics, Inc. (Nasdaq: CTMX), a leader in the field of masked, conditionally activated biologics, reported 2025 financial results and provided a business update.
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"Today’s encouraging Varseta-M Phase 1 update underscores the program’s intentional design and broad potential in CRC as well as other EpCAM-expressing indications. CytomX’s top priority in 2026 is to align with the FDA on a registrational path for Varseta-M in late-line CRC. We also plan to accelerate Varseta-M combination studies to benefit CRC patients in earlier lines of treatment," said Sean McCarthy, D.Phil., chief executive officer and chairman of CytomX.
"Our continued and exciting progress with Varseta-M reinforces our leadership in the field of masking and CytomX’s ability to unlock true innovation. Our highly focused portfolio strategy is also illustrated by our second clinical program, CX-801. This masked version of Interferon-alpha-2b is being developed initially in advanced melanoma and, we believe, has the potential to become a new centerpiece of combination immunotherapy across multiple cancers. The CX-801 translational and biomarker data presented to date have been very encouraging, and we expect to share initial proof of concept data for the combination with KEYTRUDA later this year."
Pipeline Program Updates:
Varsetatug masetecan (EpCAM PROBODY Topo-1 ADC, CX-2051)
Announced positive data update from Phase 1 dose expansion study of Varseta-M in patients with advanced colorectal cancer (CRC).
The Company aims to align with the FDA in 2026 on a potential registrational study design for Varseta-M monotherapy in advanced CRC.
Additional Phase 1 follow-up data are also expected to be presented at major medical meeting(s) in 2026.
A Phase 1 Varseta-M combination study with bevacizumab in CRC has been initiated and a Phase 1b/2 study in combination with bevacizumab and chemotherapy is expected to start by the end of 2026.
Initiation of Phase 1 expansion cohort(s) in additional indications is planned for 2H 2026.
CX-801 (PROBODY Interferon alpha-2b)
The CX-801 Phase 1 study is progressing with a focus in advanced melanoma. The CX-801 monotherapy dose escalation portion of the study has reached the fourth dose level.
CX-801 monotherapy has been well tolerated at dose levels exceeding the approved dose of unmasked IFNα2b.1
In May 2025, Phase 1 dose escalation of CX-801 in combination with KEYTRUDA (pembrolizumab) was initiated. Dose escalation of CX-801 in combination with KEYTRUDA is currently enrolling the 2nd dose level.
Biomarker data from the CX‑801 monotherapy study in advanced melanoma were presented at the 2025 Society for Immunotherapy of Cancer (SITC) (Free SITC Whitepaper) Annual Meeting, reinforcing CX‑801’s mechanism of action and supporting the ongoing combination trial with KEYTRUDA.
Initial clinical data for CX-801 in combination with KEYTRUDA in advanced melanoma is projected by the end of 2026.
KEYTRUDA is a registered trademark of Merck Sharp & Dohme LLC, a subsidiary of Merck & Co., Inc., Rahway, NJ, USA
Corporate and Financial:
Financial:
CytomX ended 2025 with $137.1 million of cash, cash equivalents and investments with expected cash runway to the second quarter of 2027.
Research Pipeline and Collaborations:
CytomX has research collaborations with Bristol Myers Squibb, Amgen, Regeneron, and Moderna. Multiple drug discovery programs continue across our research collaborations with a focus on bispecific immunotherapies, including T-cell engagers.
In March 2026, Astellas chose to not advance the remaining preclinical research programs under the alliance resulting in a termination of the collaboration effective in the second quarter of 2026.
Full Year 2025 Financial Results:
Cash, cash equivalents and investments totaled $137.1 million as of December 31, 2025, compared to $100.6 million as of December 31, 2024.
Total revenue was $76.2 million for the year ended December 31, 2025, compared to $138.1 million in 2024. The decrease in revenue was driven primarily by the completion of our performance obligations in our collaboration with Bristol Myers Squibb in April 2025 as well as a lower estimated percentage of performance obligation completion for 2025 compared to 2024 in the Moderna, Astellas, and Regeneron collaborations.
In 2025, CytomX remained focused on controlling costs and efficiently progressing its pipeline programs. Total operating expense for 2025 was $98.6 million compared to $113.1 million for 2024, a decrease of $14.5 million.
Research and development expenses decreased by $14.7 million during the year ended December 31, 2025, to $68.7 million compared to $83.4 million for 2024. Research and development expenses decreased primarily due to lower general research and development expenses as a result of our January 2025 restructuring and reduced expenses for CX-904, partially offset by increased manufacturing and clinical spend on Varseta-M.
General and administrative expenses increased by $0.1 million during the year ended December 31, 2025, to $29.8 million, compared to $29.7 million for 2024. The general and administrative expenses for 2025 included $1.1 million of one-time restructuring expenses partially offset by reduced personnel related expenses and legal and consulting related expenses.
(Press release, CytomX Therapeutics, MAR 16, 2026, View Source [SID1234663566])