{"type": "root", "children": [{"type": "p", "children": [{"type": "t", "text": "\n LINC01419 is an oncogenic long non‐coding RNA that is overexpressed in multiple cancer types, including hepatocellular carcinoma (HCC), lung adenocarcinoma (LUAD), gastric cancer, esophageal squamous cell carcinoma (ESCC), osteosarcoma, and ovarian carcinoma. In HCC, LINC01419 has been shown to promote tumor progression by enhancing cell proliferation, metastasis, and invasion. Mechanistically, it can activate oncogenic signaling cascades via two distinct routes: one study demonstrated that LINC01419 directly interacts with the promoter region of NDRG1 to increase its transcriptional activity, thereby driving aggressive tumor behavior (see"}, {"type": "fg", "children": [{"type": "fg_f", "ref": "1"}]}, {"type": "t", "text": ", whereas another report revealed that LINC01419 increases methylation of the ZIC1 promoter, resulting in reduced ZIC1 expression and subsequent activation of the PI3K/Akt pathway."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "2"}]}, {"type": "t", "text": " In LUAD, LINC01419 functions as a competing endogenous RNA by sequestering miR‐519b‐3p, which in turn elevates RCCD1 expression and promotes cell proliferation, migration, and invasion."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "3"}]}, {"type": "t", "text": " Similarly, in osteosarcoma, it acts as a ceRNA to modulate the miR‐519a-3p/PDRG1 axis, thereby accelerating malignant phenotypes."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "4"}]}, {"type": "t", "text": " In ESCC, overexpressed LINC01419 induces hypermethylation of the GSTP1 promoter, which decreases GSTP1 expression, enhances cell proliferation, reduces apoptosis, and diminishes sensitivity to 5-fluorouracil, suggesting a role in chemoresistance."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "5"}]}, {"type": "t", "text": " Its upregulation has also been validated in HBV- and HCV-related HCC"}, {"type": "fg", "children": [{"type": "fg_f", "ref": "6"}]}, {"type": "t", "text": ", and LINC01419 has emerged as a promising diagnostic and prognostic biomarker in HCC and other malignancies."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "7"}]}, {"type": "t", "text": " Additionally, increased expression of LINC01419 has been observed in lung cancer tissues alongside other long non-coding RNAs"}, {"type": "fg", "children": [{"type": "fg_f", "ref": "9"}]}, {"type": "t", "text": ", in gastric cancer where its inhibition suppresses cell invasion and migration"}, {"type": "fg", "children": [{"type": "fg_f", "ref": "10"}]}, {"type": "t", "text": ", and in ovarian carcinoma as part of a multi-lncRNA prognostic signature."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "11"}]}, {"type": "t", "text": " Together, these studies indicate that LINC01419 exerts multiple oncogenic functions—ranging from transcriptional regulation and epigenetic modulation to miRNA sponging—across a spectrum of tumor types.\n "}]}, {"type": "rg", "children": [{"type": "r", "ref": 1, "children": [{"type": "t", "text": "Hao Dang, Ling Chen, Ping Tang, et al. 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