{"type": "root", "children": [{"type": "p", "children": [{"type": "t", "text": "\n GAS5‐AS1 is a long noncoding RNA that appears to act predominantly as a tumor suppressor and regulator of cell differentiation in multiple disease contexts. In non‐small cell lung cancer, GAS5‐AS1 is downregulated relative to normal tissue, and its reduced expression correlates with larger tumors, higher TNM stages, and increased lymph node metastasis; functionally, forced expression of GAS5‐AS1 inhibits cell migration and invasion by decreasing key epithelial–mesenchymal transition (EMT) markers."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "1"}]}, {"type": "t", "text": "\n "}]}, {"type": "t", "text": "\n "}, {"type": "p", "children": [{"type": "t", "text": "\n In hepatocellular carcinoma, lower levels of GAS5‐AS1 are associated with poor differentiation, advanced TNM stage, and unfavorable overall survival, suggesting its potential as a diagnostic and prognostic biomarker."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "2"}]}, {"type": "t", "text": "\n "}]}, {"type": "t", "text": "\n "}, {"type": "p", "children": [{"type": "t", "text": "\n Similarly, in cervical cancer, GAS5‐AS1 expression is markedly decreased compared to adjacent normal tissues. Its downregulation correlates with advanced disease stage, metastasis, and poor prognosis, while experimental upregulation of GAS5‐AS1 suppresses proliferation, migration, and invasion. Mechanistically, it interacts with the tumor suppressor GAS5, enhancing its stability through modulation of RNA demethylation."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "3"}]}, {"type": "t", "text": "\n "}]}, {"type": "t", "text": "\n "}, {"type": "p", "children": [{"type": "t", "text": "\n Beyond its roles in malignancy, GAS5‐AS1 also participates in non‐cancerous regulatory networks. It has been identified as a regulatory factor in human adipose‐derived stem cells, where it is part of a competing endogenous RNA network that modulates adipocytokine and IL‑17 signaling pathways to promote proliferation and adipogenic differentiation."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "4"}]}, {"type": "t", "text": "\n "}]}, {"type": "t", "text": "\n "}, {"type": "p", "children": [{"type": "t", "text": "\n Moreover, GAS5‐AS1 has emerged from transcriptomic studies as a component of ceRNA networks involved in type 1 diabetes mellitus, where it may influence insulin signaling and related pathways."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "5"}]}, {"type": "t", "text": "\n "}]}, {"type": "t", "text": "\n "}, {"type": "p", "children": [{"type": "t", "text": "\n Its inclusion in immune‐related prognostic signatures for cervical cancer further underscores the clinical significance of GAS5‐AS1 as a potential biomarker for patient outcome."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "6"}]}, {"type": "t", "text": "\n "}]}, {"type": "t", "text": "\n "}, {"type": "p", "children": [{"type": "t", "text": "\n Finally, in the context of oral submucous fibrosis, a precancerous condition, GAS5‐AS1 is significantly reduced in affected tissues, and its overexpression diminishes myofibroblast activity and collagen contractility—effects that may be mediated via inhibition of Smad signaling—thereby implicating GAS5‐AS1 in fibrogenesis and disease progression."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "7"}]}, {"type": "t", "text": "\n "}]}, {"type": "rg", "children": [{"type": "r", "ref": 1, "children": [{"type": "t", "text": "Ying Wu, Hui Lyu, Hongbing Liu, et al. "}, {"type": "b", "children": [{"type": "t", "text": "Downregulation of the long noncoding RNA GAS5-AS1 contributes to tumor metastasis in non-small cell lung cancer."}]}, {"type": "t", "text": " "}, {"type": "i", "children": [{"type": "t", "text": "Sci Rep (2016)"}]}, {"type": "t", "text": " DOI: "}, {"type": "a", "children": [{"type": "t", "text": "10.1038/srep31093"}], "href": "https://doi.org/10.1038/srep31093"}, {"type": "t", "text": " PMID: "}, {"type": "a", "children": [{"type": "t", "text": "27489122"}], "href": "https://pubmed.ncbi.nlm.nih.gov/27489122"}]}, {"type": "r", "ref": 2, "children": [{"type": "t", "text": "Yingchao Wang, Wei Jing, Weijie Ma, et al. 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