{"type": "root", "children": [{"type": "p", "children": [{"type": "t", "text": "\nSTK31 is a serine/threonine kinase that is frequently deregulated in human cancers, notably in colorectal tumors where it plays a key role in regulating cancer cell differentiation and mitotic progression. In colon cancer, STK31’s overexpression helps maintain an undifferentiated, tumorigenic state in a manner that critically depends on its intact kinase domain, while its knockdown induces differentiation and diminishes tumorigenicity. Moreover, dynamic localization of STK31 to centrosomal regions, centromeres, the central spindle, and the midbody during mitosis underscores its role in proper cell cycle progression—with impaired expression leading to microtubule assembly defects, prolonged mitosis, and apoptosis. Epigenetic events, such as promoter methylation, further modulate its expression, as evidenced in cervical tumors and in the association of its expression with metastatic dissemination and tumor stage in colorectal cancer."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "1", "end_ref": "4"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nIn lung and gastric cancers, STK31 acts as an oncogene by promoting cell cycle progression and proliferation. In lung cancer cells, increased expression of STK31 accelerates the G1 phase and enhances cell viability, migration, and invasion through upregulation of the Wnt/β-catenin pathway and activation of c‑myc in a positive feedback loop. Similarly, in gastric cancer, hypomethylation of the STK31 promoter drives its transcriptional activation, which in turn facilitates enhanced proliferation, colony formation, and migration—correlating with poorer patient survival."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "5"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nBeyond its intracellular functions, STK31 is classified as a cancer/testis antigen with significant clinical potential. In pancreatic cancer, STK31 expression is not only governed by promoter methylation but is also directly regulated by miR‑543, linking its expression to patient survival outcomes and implicating it in a broader protein–protein interaction network that includes PIWI and Tudor family members. Furthermore, studies evaluating circulating STK31 mRNA in colorectal cancer patients have highlighted its promise as a minimally invasive biomarker for early tumor detection and disease monitoring."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "7", "end_ref": "10"}]}, {"type": "t", "text": "\n"}]}, {"type": "rg", "children": [{"type": "r", "ref": 1, "children": [{"type": "t", "text": "Kin Lam Fok, Chin Man Chung, Shao Qiong Yi, et al. 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