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Researchers developed three new mouse models of head and neck squamous cell carcinoma (HNSCC) called FMOC1, FMOC2, and FMOC3, derived from chemically-induced oral tumors in FVB/NJ mice. While all three cell lines formed tumors in immune-deficient mice, only FMOC1 grew in mice with intact immune systems, whereas FMOC2 and FMOC3 tumors were rejected by T cells unless those immune cells were depleted. The FMOC1 model responded to checkpoint inhibitor immunotherapies targeting PD-L1 and CTLA-4, demonstrating its utility for studying how HNSCC tumors evade immune destruction.
Why it matters
These models provide valuable tools for investigating why most HNSCC patients do not respond to immunotherapy, which currently benefits fewer than 20% of cases. The availability of both immune-evasive and immune-rejected tumor variants in the same genetic background enables precise study of immune escape mechanisms and testing of new immunotherapy approaches.
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⚠️ Preprint – Noch nicht peer-reviewed
Dieser Artikel wurde noch nicht von unabhängigen Experten begutachtet. Die Ergebnisse sind vorläufig und sollten mit Vorsicht interpretiert werden.
Head and neck squamous cell carcinoma (HNSCC) is the sixth most common cancer worldwide, and patient outcomes have remained largely unchanged despite advances in multimodal therapy. Immune checkpoint inhibitors (ICIs), which block the PD-1/PD-L1 axis to restore T cell-mediated anti-tumor immunity, have emerged as a promising treatment strategy. However, response rates remain below 20% in HNSCC, underscoring the need to better understand mechanisms of immune evasion within the tumor microenvironment. Syngeneic mouse models are essential for studying tumor-immune interactions, yet currently available HNSCC models are limited. Here, we report the development of a novel FVB/NJ-derived syngeneic HNSCC model generated from 7,12-dimethylbenz(a)anthracene (DMBA)-induced primary on floor of mouth/buccal tumors, designated FMOC1, FMOC2, and FMOC3 (FVB/NJ Mouse Oral Cancer). In vitro, all FMOC cell lines exhibited robust proliferative capacity with distinct proliferation kinetics. In vivo, all FMOC cell lines exhibited characteristic HNSCC histopathology, including cytokeratin 5 positivity, and were tumorigenic in immunodeficient NCG mice; however, in syngeneic immunocompetent mice, only FMOC1 demonstrated sustained tumor growth at orthotopic and flank sites, whereas FMOC2 and FMOC3 tumors underwent spontaneous regression within 2 weeks, indicating differential immune-dependent tumorigenicity among the lines. Consistent with this, depletion of CD4+ and/or CD8+ T cells restored tumor growth in FMOC2 and FMOC3 models, indicating a critical role for T cell-mediated immunity in tumor suppression. Notably, FMOC1 tumors were responsive to anti-PD-L1 and anti-CTLA-4 therapy, supporting their utility for evaluating immunotherapeutic strategies. Collectively, these findings establish the FMOC model as a novel and versatile platform to study tumor-immune interactions and immune evasion mechanisms in HNSCC, with potential applications in preclinical immunotherapy development.
Source: A Novel Syngeneic Mouse Model to Study Immune Evasion in Head and Neck Squamous Cell Carcinoma