On May 14, 2025 Theriva Biologics (NYSE American: TOVX), a diversified clinical-stage company developing therapeutics designed to treat cancer and related diseases in areas of high unmet need, reported financial results for the first quarter ended March 31, 2025, and provided a corporate update (Press release, Theriva Biologics, MAY 14, 2025, View Source [SID1234653088]).

Schedule your 30 min Free 1stOncology Demo!
Discover why more than 1,500 members use 1stOncology™ to excel in:

Early/Late Stage Pipeline Development - Target Scouting - Clinical Biomarkers - Indication Selection & Expansion - BD&L Contacts - Conference Reports - Combinatorial Drug Settings - Companion Diagnostics - Drug Repositioning - First-in-class Analysis - Competitive Analysis - Deals & Licensing

                  Schedule Your 30 min Free Demo!

"We have started 2025 with outstanding clinical progress," said Steven A. Shallcross, Chief Executive Officer of Theriva Biologics. "The VIRAGE Phase 2b clinical trial of VCN-01 (zabilugene almadenorepvec) with gemcitabine/nab-paclitaxel in newly diagnosed metastatic pancreatic cancer patients achieved its primary survival and safety endpoints, highlighting the potential therapeutic benefits of our oncolytic virus platform. We are working to scale up manufacturing and finalize the design of a Phase 3 trial of VCN-01 with gemcitabine/nab-paclitaxel which if successful, may allow us to deliver this innovative treatment option to patients suffering this fatal disease."

Recent Highlights and Anticipated Milestones

VCN-01

Metastatic Pancreatic Ductal Adenocarcinoma (mPDAC):

As recently announced, mPDAC patients treated with VCN-01 (zabilugene almadenorepvec) plus gemcitabine/nab-paclitaxel standard-of-care (SoC) chemotherapy had increased overall survival (OS), progression free survival (PFS), and duration of response (DOR) compared to patients treated with gemcitabine/nab-paclitaxel SoC.
VCN-01 was well-tolerated, with transient and reversible adverse events (AEs).
The increase in OS was greater for patients who received 2 doses of VCN-01 and 4 or more cycles of gemcitabine/nab-paclitaxel compared with patients who received 4 or more cycles of gemcitabine/nab-paclitaxel SoC alone, suggesting that the second dose of VCN-01 (administered 3 months after the first dose) provides a meaningful additional benefit in this treatment subgroup.
Theriva had hosted a virtual event featuring feature eminent pancreatic cancer clinician/researchers to review and discuss the data from the VIRAGE trial of VCN-01. To access the replay of the event, click HERE.
The Company is currently working to scale up manufacturing of VCN-01 and finalizing the design of a potential Phase 3 confirmatory trial for VCN-01 in mPDAC.
SYN-004

Allogeneic hematopoietic cell transplant (HCT):

As recently announced, data from a Phase 1b/2a trial investigating SYN-004 (ribaxamase) in allogeneic hematopoietic cell transplant (HCT) recipients for the prevention of acute graft-versus-host-disease (aGVHD) was presented at the Congress of the European Society of Clinical Microbiology and Infectious Diseases (ESCMID Global) in April.
Corporate Updates

As recently announced, Theriva closed a public offering of 6,818,180 shares of common stock (or pre-funded warrants in lieu thereof) and warrants to purchase up to 6,818,180 shares of common stock at a combined offering price of $1.10 per share and accompanying warrant (the "Offering"). The Company received aggregate gross proceeds of approximately $7.5 million, before deducting placement agent fees and other offering expenses. The warrants have an exercise price of $1.10 per share, are exercisable immediately and expire five years from the issuance date.
The Company intends to use the net proceeds from the Offering primarily for working capital and general corporate purposes, including for research and development, and manufacturing scale-up of VCN-01 for a potential Phase 3 clinical trial.
First Quarter Ended March 31, 2025 Financial Results

General and administrative expenses decreased to $1.4 million for the three months ended March 31, 2025, from $1.9 million for the three months ended March 31, 2024. This decrease of 25% is primarily comprised of the decrease in salary costs, travel, lower director and officer insurance, and a decrease in fair value of the contingent consideration adjustment. The charge related to stock-based compensation expense was $54,000 for the three months ended March 31, 2025, compared to $101,000 for the three months ended March 31, 2024.

Research and development expenses decreased to $3.0 million for the three months ended March 31, 2025, from approximately $3.5 million for the three months ended March 31, 2024. This decrease of 14% is primarily the result of lower indirect cost related to decreased VCN-01 manufacturing costs and lower clinical trial expenses related to our Phase 1b/2a clinical trial of SYN-004 (ribaxamase) in allogeneic HCT recipients, offset by slightly higher clinical trial expenses related to our VIRAGE Phase 2b clinical trial of VCN-01 in PDAC and higher patent expenses related to SYN-020. We anticipate research and development expense to increase as we complete our VIRAGE Phase 2b clinical trial of VCN-01 and plan for our Phase 3 clinical trial of VCN-01 in PDAC, advance our VCN-01 program in retinoblastoma, expand GMP scale-up manufacturing activities for VCN-01, and continue supporting our other preclinical and discovery initiatives. The charge related to stock-based compensation expense was $46,000 for the three months ended March 31, 2025, compared to $58,000 related to stock-based compensation expense for the three months ended March 31, 2024.

Other income was $93,000 for the three months ended March 31, 2025 compared to other income of $227,000 for the three months ended March 31, 2024. Other income for the three months ended March 31, 2025 is primarily comprised of interest income of $96,000 and an exchange loss of $3,000. Other income for the three months ended March 31, 2024 is primarily comprised of interest income of $228,000 and exchange loss of $1,000.

Cash and cash equivalents totaled $10 million as of March 31, 2025, compared to $11.6 million as of December 31, 2024. Subsequent to closing of the public offering on May 8 2025, the Company’s cash balance was $14.1 million.

About Pancreatic Ductal Adenocarcinoma

Cancer of the pancreas consists of two main histological types: cancer that arises from the ductal (exocrine) cells of the pancreas or, much less often, cancers may arise from the endocrine compartment of the pancreas. Pancreatic ductal adenocarcinoma ("PDAC") accounts for more than 90% of all pancreatic tumors. It can be located either in the head of the pancreas or in the body/tail. Pancreatic cancer usually metastasizes to the liver and peritoneum. Other less common metastatic sites are the lungs, brain, kidney and bone. In its early stages, pancreatic cancer does not typically result in any characteristic symptoms, so in most cases it is diagnosed in its late stages (locally advanced non-metastatic or metastatic disease) when surgical resection and possibly curative treatment is not possible. It is generally assumed that only 10% of cases are resectable at presentation, whereas 30-40% of patients are diagnosed at local advanced/unresectable stage and 50-60% present with distant metastases.

About VIRAGE

VIRAGE was a two-arm, Phase 2b open-label, randomized, controlled, multicenter clinical trial in patients with histologically confirmed, newly-diagnosed metastatic PDAC. Patients were enrolled at 5 sites in the U.S. and 9 sites in Spain. In both the control and VCN-01 (zabilugene almadenorepvec) treatment arms, patients received gemcitabine/nab-paclitaxel standard-of-care chemotherapy in repeated 28-day cycles until disease progression. In the VCN-01 treatment arm only, patients were also administered intravenous VCN-01 seven-days prior to starting the first and fourth cycles of gemcitabine/nab-paclitaxel treatment (study days 1 and ~92 respectively). Primary endpoints for the trial include overall survival and VCN-01 safety/tolerability. Additional endpoints include progression free survival, duration of response, and measures of VCN-01 biodistribution, replication, and immune response. More information about the trial is available on Clinicaltrials.gov (NCT05673811), through the Spanish Clinical Trials Registry and European Union Drug Regulating Authorities Clinical Trials Database (EudraCT Number: 2022-000897-24).

About VCN-01

VCN-01 (zabilugene almadenorepvec) is a systemically administered oncolytic adenovirus designed to selectively and aggressively replicate within tumor cells and degrade the tumor stroma that serves as a significant physical and immunosuppressive barrier to cancer treatment. This unique mode-of-action enables VCN-01 to exert multiple antitumor effects by (i) selectively infecting and lysing tumor cells; (ii) enhancing the access and perfusion of co-administered chemotherapy products; and (iii) increasing tumor immunogenicity and exposing the tumor to the patient’s immune system and co-administered immunotherapy products. Systemic administration enables VCN-01 to exert its actions on both the primary tumor and metastases. VCN-01 has been administered to 142 patients to date in clinical trials of different cancers, including PDAC (in combination with chemotherapy), head and neck squamous cell carcinoma (with an immune checkpoint inhibitor), ovarian cancer (with CAR-T cell therapy), colorectal cancer, and retinoblastoma (by intravitreal injection). More information on these clinical trials is available at Clinicaltrials.gov.