{"type": "root", "children": [{"type": "p", "children": [{"type": "t", "text": "\n MAGE‐A9 is an oncogenic cancer/testis antigen that exhibits highly restricted expression in normal tissues yet is aberrantly activated in a broad spectrum of human malignancies—including bladder, esophageal, hepatocellular, lung, breast, renal, and even liposarcoma—thereby serving as both a prognostic biomarker and a promising target for immunotherapy."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "1", "end_ref": "4"}]}, {"type": "t", "text": " In many tumors, high levels of MAGE‐A9 expression correlate with more advanced grade, nodal and distant metastasis, recurrence, and overall poor survival."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "1"}, {"type": "fg_f", "ref": "3"}, {"type": "fg_fs", "start_ref": "5", "end_ref": "7"}]}, {"type": "t", "text": " Functionally, MAGE‐A9 promotes tumor progression by enhancing cell proliferation, migration, invasion, and chemoresistance, and it may help maintain cancer stem cell properties, as observed in liver tumors"}, {"type": "fg", "children": [{"type": "fg_f", "ref": "8"}, {"type": "fg_f", "ref": "5"}]}, {"type": "t", "text": "; in lung adenocarcinoma, its suppression can trigger apoptosis."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "5"}]}, {"type": "t", "text": " Mechanistically, MAGE‐A9 has been implicated in the modulation of hypoxic responses through its interaction with factors such as prolyl hydroxylase (which regulates HIF‐1α stability)"}, {"type": "fg", "children": [{"type": "fg_f", "ref": "9"}]}, {"type": "t", "text": ", and its transcription can be regulated both epigenetically—through promoter demethylation"}, {"type": "fg", "children": [{"type": "fg_f", "ref": "10"}]}, {"type": "t", "text": "—and post‐transcriptionally via microRNAs."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "11"}]}, {"type": "t", "text": " Notably, owing to its tumor‐restricted and immunogenic nature, MAGE‐A9-derived peptides have been harnessed to induce cytotoxic T lymphocyte responses in several tumor types"}, {"type": "fg", "children": [{"type": "fg_f", "ref": "12"}]}, {"type": "t", "text": ", underscoring its potential value in cancer immunotherapy. 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