{"type": "root", "children": [{"type": "p", "children": [{"type": "t", "text": "\nmiR‐224 is a small regulatory RNA that is frequently found to be aberrantly expressed in a wide spectrum of human diseases, particularly in many types of cancer. In hepatocellular carcinoma, lung cancer, and other malignancies, miR‐224 dysregulation has been associated with imbalances in cell proliferation, apoptosis, and gene expression programs. Several studies have reported that in tumors such as HCC and non‐small cell lung cancer, miR‐224 is markedly up‐regulated, contributing to enhanced tumor cell proliferation and altered cellular homeostasis, while its expression can vary in other conditions, highlighting its context‐dependent nature."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "1", "end_ref": "10"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nMechanistically, miR‐224 functions by directly targeting a variety of genes that govern key cellular processes. It has been shown to inhibit anti‐apoptotic factors (such as API‐5) and tumor suppressors including TNFAIP1, SMAD4, TRIB1, and RKIP, among others. These direct interactions enable miR‐224 to modulate cell survival, migration, and invasion across different tumor types. Accordingly, changes in miR‐224 levels have been linked to shifts in the balance between oncogenic signaling and tumor suppression; in some cancers its overexpression drives tumor progression, whereas in others its loss is associated with more aggressive features."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "11", "end_ref": "20"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nIn addition to its effects on proliferation and survival, miR‐224 has been implicated in the regulation of cell motility, invasion, and metastatic potential. In lung adenocarcinoma, melanoma, and renal cell carcinoma, for instance, altered miR‐224 expression contributes to epithelial–mesenchymal transition (EMT) and enhanced migratory behavior. Moreover, miR‐224 has been identified within exosomal compartments and is involved in the intercellular transfer of oncogenic signals. In some contexts, modulation of miR‐224 also impacts apoptosis—such as through its targeting of caspase‐3 and caspase‐7—and can influence resistance to cell death, thereby contributing to tumor aggressiveness."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "21", "end_ref": "30"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nBeyond direct regulation of oncogenic traits, miR‐224 also shows promise as a biomarker. Its expression levels have been correlated with diagnostic and prognostic outcomes in several cancers—including prostate, colorectal, pancreatic, and uveal melanoma—where it reflects activity in signaling cascades such as PI3K/Akt and pathways regulating autophagy. Furthermore, miR‐224 is subject to regulation by epigenetic modifications and can be sequestered by long non‐coding RNAs, adding layers of complexity to its functional network during tumorigenesis."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "31", "end_ref": "40"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nFinally, several studies have underscored the role of miR‐224 in mediating chemoresistance and aggressive tumor behavior. In ovarian cancer, for example, overexpression of miR‐224‐5p has been linked to resistance to platinum‐based chemotherapy via targeting of apoptotic mediators such as PRKCD. Similar regulatory roles have been uncovered in glioblastoma, breast cancer, and colorectal carcinoma, where modulation of miR‐224 levels affects drug sensitivity and clinical outcomes. Moreover, in renal and penile cancers, miR‐224 expression patterns provide prognostic information, further emphasizing its potential as a therapeutic target."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "41", "end_ref": "50"}]}, {"type": "t", "text": "\n"}]}, {"type": "rg", "children": [{"type": "r", "ref": 1, "children": [{"type": "t", "text": "Yu Wang, Alvin T C Lee, Joel Z I Ma, et al. 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