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Illustration of chimeric antigen receptor (CAR) T cells (blue) attacking neuroendocrine tumour (NET) cells (red). Healthy red (discs) and white (translucent) blood cells are visible in the background. Neuroendocrine cells are found throughout the body. They secrete hormones that control many physiological processes. Neuroendocrine tumours, which arise from these cells, are rare and can be benign (non-cancerous) or malignant (cancerous). The tumours are usually slow-growing. NETs can cause abnormal, excessive or insufficient hormone production. Symptoms and treatment vary widely depending on the location of the NETs. CAR-T therapy is a type of immunotherapy that genetically modifies a patient's own T cells, a form of white blood cell, to recognise and destroy cancer cells