Despite the remarkable progress in cancer treatment, many patients still face disappointing outcomes. Chemotherapy, targeted therapy, radiation, and even immunotherapy often fail to produce the desired results. For example, only a subset of patients (often <30%) respond to immune checkpoint inhibitors. Many tumors are “cold” — meaning the immune system doesn’t even recognize them as threats.

But a new approach is gaining momentum. One that not only fills in these gaps but enhances existing therapies: oncolytic virotherapy (OV), especially when used in combination with conventional treatments.

What Makes Oncolytic Viruses So Unique

Oncolytic viruses (OVs) are a class of viruses that:

  • Selectively infect and destroy cancer cells (oncolysis)
  • Activate the body’s immune response against tumors — helping the immune system recognize and destroy cancer more effectively
  • In essence, they work as both a direct treatment and an immune system teacher

One such virus — ECHO-7 Rigvir — has demonstrated clinical success, especially in melanoma, sarcoma, and colorectal cancer. Published case reports describe synergy between Rigvir and both Avastin (Bevacizumab) and Opdivo (Nivolumab) — leading not only to tumor remission but also reduced treatment side effects.

Synergy in Action: Combining OVs with Immunotherapy

This is where synergy truly shines. Oncolytic viruses “heat up” the tumor microenvironment by:

  • Increasing tumor inflammation
  • Releasing tumor antigens
  • Attracting T-cells to the tumor site

Then checkpoint inhibitors like Opdivo or Keytruda unleash T-cells by removing the immune system’s “brakes.” As a result, treatment effectiveness can increase by as much as 30%, and immune response rates can exceed 60%. In some cases, even full tumor remission is achieved — including in cancers that were previously unresponsive to immunotherapy.

Enhancing Targeted Therapy with Oncolytic Viruses

Combining oncolytic viruses (OVs) with anti-angiogenic targeted therapies such as bevacizumab (Avastin) can normalize abnormal tumor blood vessels, improve immune cell infiltration, and enhance the delivery and spread of the virus within the tumor. This combination helps overcome therapeutic resistance and can lead to more durable tumor control and improved treatment outcomes.

Optimizing Treatment Sequences

Clinical and preclinical studies show that oncolytic viruses should ideally be given first, 3–5 days prior to immunotherapy or targeted therapy. This sequence allows the virus to:

  • Create local tumor inflammation
  • Recruit immune cells
  • Boost antigen presentation

Then, the follow-up therapy can work more effectively, targeting the now “visible” and inflamed tumor. In other words: The virus “opens the door,” and the immunotherapy “sends in the troops.”

Integrating Chemotherapy and Radiation

Chemotherapy and radiation can cause immunogenic cell death, which complements the viral effect. However, timing is critical: administer OVs 5 days before or after chemotherapy/radiation to avoid killing the virus itself. This spacing allows the virus to do its job while benefiting from the added tumor stress these treatments provide.

Real-World Impact

Several peer-reviewed case studies have highlighted the success of Rigvir combined with standard oncology drugs, including:

These results point to real synergy — not just in tumor response, but also in reducing side effects, possibly by lowering required drug doses.

Personalized and Precision Medicine

This emerging therapeutic strategy can truly be described as: Personalized and precision medicine in its most powerful form.

Thanks to innovations like Rigvir SE — a food supplement containing the ECHO-7 virus — this synergy is no longer just for clinical trials or select hospitals. It’s becoming accessible to patients and oncologists as a practical, low-toxicity option — including for metastasis prevention or for individuals at increased risk of developing cancer.

While other oncolytic viruses like T-VEC are available, they often come with complex storage needs, regulatory hurdles, and high costs. In contrast, Rigvir has over 20 years of clinical use, is well-tolerated, and is now more widely available.

Key Takeaways

  • Oncolytic viruses both destroy tumors directly and activate the immune system, making cancer cells more visible and vulnerable to attack.
  • When combined with immunotherapy, response rates can double or more, reaching over 60% in some studies (e.g., Opdivo).
  • Oncolytic viruses also enhance the effectiveness of targeted therapy (e.g., Avastin) by improving drug delivery, immune infiltration, and reducing resistance.
  • They improve the impact of chemotherapy and radiation by creating an inflammatory tumor environment and increasing immunogenicity — while potentially reducing treatment-related toxicity.
  • The right timing and sequence are critical: virus first (ideally 3–5 days before), followed by immunotherapy or targeted drugs; 5 days before or after chemo/radiation helps avoid viral inactivation.
  • Case studies show not only improved treatment efficacy but also fewer and milder side effects — suggesting better overall patient tolerance and resilience.
  • This personalized, synergistic approach empowers oncologists and gives new hope to patients — especially those with advanced, resistant, or immunologically “cold” tumors.

Materials referenced from Nature (https://www.nature.com/articles/s41392-023-01407-6) and other peer-reviewed medical journals.