![An immune cell aggregate known as a tertiary lymphoid structure located within a pancreatic cancer as a result of treatment with activated T cell extracellular vesicle DNA and immune checkpoint blockade. [Mengying Hu]](https://www.vitaminrush.com/wp-content/uploads/2026/05/1777715621_Low-Res_Lyden_CancerCell-115x115.jpg)
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