{"type": "root", "children": [{"type": "p", "children": [{"type": "t", "text": "\nREG1A is a secreted member of the regenerating (Reg) gene family that functions as a potent trophic factor in several tissues. In the digestive system and pancreas it promotes cellular proliferation, mediates anti‐apoptotic processes, and facilitates tissue repair and regeneration. For example, REG1A expression is increased in regenerating pancreatic islets and injured gastrointestinal mucosa, suggesting it contributes to beta‐cell renewal and acinar dedifferentiation while also coordinating inflammatory responses through cytokine‐driven pathways. In addition, its regulated expression in neural and cardiac tissues points to roles in neurite outgrowth and protection following myocardial injury."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "1", "end_ref": "24"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nDeregulated REG1A expression is also closely linked to cancer progression and therapeutic responsiveness. In several malignancies—including esophageal, gastric, breast, and lung cancers—overexpression of REG1A has been associated with increased tumor cell invasiveness, angiogenesis, and metastasis; it further appears to enhance chemosensitivity and radiosensitivity by modulating intracellular signaling cascades such as the MAPK pathway and IL‐6–mediated circuits. 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