{"type": "root", "children": [{"type": "p", "children": [{"type": "t", "text": "\nMelanoma Inhibitory Activity (MIA) is an 11‐kDa secreted protein originally identified in malignant melanoma that now appears to play multifaceted roles in cancer biology. Elevated expression of MIA has been documented not only in melanoma but also in other solid tumors such as gastric cancer, where its up‐regulation correlates with increased cell invasion and poor prognosis, and in lung cancers, where it promotes proliferation, migration, and resistance to apoptosis. Functionally, MIA interferes with cell–matrix interactions through its binding to extracellular matrix proteins (e.g., fibronectin and laminin) and integrins, thereby facilitating tumor cell detachment and subsequent metastasis. In addition, transcriptional modulators such as HMG1/NF‑κB and SOX10 enhance its expression, while alternative splicing generates isoforms that may exert distinct biological effects."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "1", "end_ref": "7"}]}, {"type": "t", "text": "\n\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nClinically, increased serum levels of MIA have emerged as a robust non‐invasive biomarker for tumor detection and disease monitoring, particularly in melanoma and uveal melanoma. Elevated MIA levels correlate with sentinel lymph node metastasis, overall tumor burden, and adverse patient outcomes. Moreover, when combined with other markers such as S‑100B and lactate dehydrogenase, MIA significantly improves the diagnostic sensitivity and prognostic stratification of patients at risk of metastatic spread."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "8", "end_ref": "13"}]}, {"type": "t", "text": "\n\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nBeyond its direct impact on tumor progression, MIA also partakes in diverse regulatory processes. In certain contexts such as pancreatic cancer and high‐grade gliomas, altered MIA expression and related autoantibody profiles have been linked to clinical outcomes. In melanoma, suppression of MIA expression not only diminishes invasive behavior but also restores cell–cell contacts and pigmentation markers. Moreover, MIA (often termed MIA/CD‑RAP in chondrogenic contexts) modulates differentiation processes by regulating key signaling pathways—including those mediated by the transcription factor YBX1 and the co‐activator p54(nrb)—and its production is closely coupled with aggrecan gene expression during cartilage formation. External cues, such as soluble factors released by macrophages and ultraviolet radiation, further influence MIA secretion, underscoring its sensitivity to microenvironmental stress and its potential role as a mediator of extracellular signals."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "14", "end_ref": "23"}]}, {"type": "t", "text": "\n\n"}]}, {"type": "rg", "children": [{"type": "r", "ref": 1, "children": [{"type": "t", "text": "Peter Hau, Petra Wise, Anja-Katrin Bosserhoff, et al. 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