– Prolonged overall survival (OS) was observed in heavily pre-treated refractory Head & Neck Squamous Cell Carcinoma (HNSCC) patients administered IV VCN-01 prior to the immune checkpoint inhibitor durvalumab –

– Pharmacokinetic, tissue biopsy, radiomic and transcriptomic results all support the proposed VCN-01 stroma-degrading and immune enhancing modes-of-action and resensitization of refractory tumors to durvalumab -

– Increased levels of PD-L1 positive T-cells and other biomarkers were found in patients after sequential administration of VCN-01 and durvalumab, consistent with reactivation of immune responses –

ROCKVILLE, Md., June 11, 2026 (GLOBE NEWSWIRE) -- Theriva™ Biologics, Inc. (NYSE:TOVX), a diversified clinical-stage company developing therapeutics designed to treat cancer and related diseases in areas of high unmet need, today announced that clinical and translational results from VCN-01's Phase 1 clinical trial in Head & Neck Squamous Cell Carcinoma (HNSCC) were recently published on-line first in the journal Clinical Cancer Research. The article, titled "Phase I trial of intravenous VCN-01 oncolytic adenovirus and durvalumab in patients with head and neck metastatic squamous cell carcinoma refractory to immunotherapy", can be read here.

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