CytomX Stock Rises 31% in a Month: Here's What You Should Know

Core Insights - CytomX Therapeutics (CTMX) shares increased by 30.8% over the past month due to strategic business updates and pipeline goals for 2026, with positive clinical progress likely boosting investor confidence [1][7] Pipeline Developments - CytomX's revenue primarily comes from collaboration agreements with companies such as Amgen, Astellas, Bristol Myers, Moderna, and Regeneron [2] - The lead program, Varseta-M (EpCAM PROBODY ADC), is in a phase I study for advanced metastatic colorectal cancer (CRC), with enrollment ongoing and updates expected in Q1 2026 [3][4] - Ongoing phase I dose-expansion studies for Varseta-M are evaluating doses of 7.2 mg/kg, 8.6 mg/kg, and 10 mg/kg, which will inform a potential registrational study design with the FDA planned for later in 2026 [4] - CytomX is also exploring Varseta-M in combination with Roche's Avastin for CRC, with a phase I study expected to start in Q1 2026 and data anticipated in H1 2027 [5] Market Context - Roche's Avastin, a legacy cancer drug, generated CHF 763 million in sales in the first nine months of 2025, although sales are declining due to biosimilar competition [6] - Over the past six months, CytomX shares surged by 126.4%, significantly outperforming the industry average increase of 22.6% [6] Additional Pipeline Updates - CytomX is developing CX-801 (PROBODY Interferon-alpha 2b) as a monotherapy and in combination with Merck's Keytruda for advanced melanoma, with initial clinical data expected by the end of 2026 [8][9] - Keytruda generated $23.3 billion in sales for Merck in the first nine months of 2025, highlighting its significance in the oncology market [8]