Exhibit 99.1 Theriva™ Biologics Reports Full-Year 2023 Operational Highlights and Financial Results – The independent data monitoring committee (IDMC) recommended the continuation of VIRAGE, the Phase 2b clinical trial of VCN- 01 in combination with chemotherapy for metastatic Pancreatic Ductal Adenocarcinoma (PDAC), with no safety concerns raised - - VIRAGE remains on track to complete enrollment in the first half of 2024- - As of December 31, 2023, Theriva Biologics reports $23.2 million in cash, which is ...