Oncolytic viruses (OVs) are being optimized to treat cancer, including brain, ovarian, lung, and pancreatic tumors. Recent advances include replicating adenoviruses and herpes simplex virus 1 (HSV-1) armed with therapeutic transgenes, combined with serial injections and systemic delivery via retargeting, as achieved for adeno-associated virus 9 (AAV9). Clinical trials are showing promising efficacy. Here, we summarize the advancements and challenges associated with OV-based cancer therapies and discuss their mechanisms of action and strategies for enhancing the efficacy of OV treatments.
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