ArticleFrontiers in immunology2026
Oncolytic virus VT1092M synergizes with immune checkpoint inhibitors against intraperitoneal metastases of colorectal cancer.
Article in Frontiers in immunology, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
Background: Intraperitoneal metastasis is a frequent progression in colon cancer, highlighting the critical need for enhanced therapeutic approaches. Oncolytic virus (OV) therapy has emerged as a promising immunotherapeutic strategy. The combination of OVs with immune checkpoint inhibitors (ICIs) has demonstrated an enhanced anti-tumor response. Methods: We generated the intraperitoneal-subcutaneous bilateral colon cancer xenograft model to simulate intraperitoneal metastatic colon cancer, and evaluated the systemic antitumor efficacy of the oncolytic HSV-1 virus VT1092M in combination with ICIs (anti-PD-L1 antibody and anti-CTLA-4 antibody). Results and discussion: Intraperitoneal administration of VT1092M markedly suppressed intraperitoneal cancer progression and enhanced the superior antitumor efficacy of ICIs immunotherapy in murine intraperitoneal metastatic colon cancer. Notably, treatment of VT1092M combined with anti-CTLA-4 antibody could eliminate both intraperitoneal metastases and subcutaneous tumors, while also inhibiting the formation of peritoneal blood vessels and malignant ascites. The synergistic combination of VT1092M and anti-CTLA-4 elicited potent intraperitoneal and systemic antitumor immunity, culminating in durable, tumor-specific memory that significantly prolonged survival in mice with colorectal intraperitoneal metastases compared to either monotherapy. Mechanistically, the combination therapy activates the anti-tumor immune environment within the peritoneal cavity, leading to a significant increase in tumoricidal CD8
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