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Updated: Jun 2, 2026

Paramyxoviruses for Tumor-targeted Immunomodulation: Design and Evaluation Ex Vivo
Published on: January 7, 2019
Immune recruitment and therapeutic synergy: keys to optimizing oncolytic viral therapy?
Jay D Naik1, Christopher J Twelves, Peter J Selby
1Leeds Institute of Molecular Medicine, University of Leeds, Leeds, UK. j.d.naik@leeds.ac.uk
Abstract:
Oncolytic viruses consist of a diverse range of DNA and RNA viruses traditionally thought to mediate their effects by exploiting aberrations in tumor pathways, allowing preferential viral replication in, and killing of, tumor cells. Clinical development has progressed to late-phase trials, potentially heralding their introduction into clinical practice. However, despite this promise, the activity of oncolytic viruses has yet to achieve the potential suggested in preclinical models. To address this disparity, we need to recognize the complex interaction among oncolytic viruses, tumor, chemotherapy, and host immune system, and appreciate that direct oncolysis may not be the only factor to play an important role in oncolytic virus-mediated antitumor efficacy. Although key in inactivating viruses, the host immune system can also act as an ally against tumors, interacting with oncolytic viruses under the right conditions to generate useful and long-lasting antitumor immunity. Preclinical data also suggest that oncolytic viruses show synergy with standard therapies, which may offer improved clinical response rates. Here, we explore clinical and preclinical data on clinically relevant oncolytic viruses, highlighting areas of progress, uncertainty, and translational opportunity, with respect to immune recruitment and therapeutic synergy.
Insights
Oncolytic viruses show promise in cancer treatment but require understanding complex interactions. Harnessing the immune system and combining with chemotherapy can enhance antitumor efficacy.
Area of Science:
- Virology
- Immunology
- Oncology
Background:
- Oncolytic viruses (OVs) are DNA and RNA viruses that replicate in and kill tumor cells.
- Clinical trials show OVs have progressed, but their efficacy has not met preclinical expectations.
- Direct tumor cell killing (oncolysis) may not be the sole mechanism of OV efficacy.
Purpose of the Study:
- To explore clinical and preclinical data on oncolytic viruses.
- To highlight progress, uncertainties, and translational opportunities in OV therapy.
- To emphasize the role of immune system interaction and therapeutic synergy.
Main Methods:
- Review of clinical and preclinical data on oncolytic viruses.
- Analysis of the complex interactions between OVs, tumors, chemotherapy, and the immune system.
- Exploration of immune recruitment and therapeutic synergy.
Main Results:
- The host immune system can be an ally, generating antitumor immunity when interacting with OVs.
- Oncolytic viruses demonstrate synergy with standard therapies, potentially improving clinical response rates.
- Direct oncolysis is not the only factor contributing to OV-mediated antitumor effects.
Conclusions:
- Understanding the interplay between OVs, the immune system, and chemotherapy is crucial for maximizing OV therapeutic potential.
- Leveraging immune responses and therapeutic synergy offers significant translational opportunities for OV therapy.
- Further research is needed to fully realize the clinical promise of oncolytic viruses.
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