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Here, we aim to find a representative prognostic marker that strongly correlates to this type of carcinoma. Transforming growth factor beta\u20101\u2010induced transcript 1 (TGFB1I1) is a cofactor of cellular TGF\u2010\u03b21 and interacts with various nuclear receptors. The previous study showed that TGFB1I1 promotes focal adhesion formation, contributing to the epithelial\u2010mesenchymal transition (EMT) with actin cytoskeleton and vimentin through TGFB1I1 regulation. We aim to reveal the role of TGFB1I1 in the tumorigenesis of UC. In silico and clinicopathological data of upper urinary tract urothelial carcinoma (UTUC) and urinary bladder urothelial carcinoma (UBUC) were accessed and analyzed for IHC staining regarding tumor characteristics, including survival outcome. Finally, an in vitro study was performed to demonstrate the biological changes of UC cells. In UTUC, overexpression of TGFB1I1 was significantly correlated with advanced tumor stage, papillary configuration, and frequent mitosis. Meanwhile, overexpression of TGFB1I1 was significantly correlated with advanced tumor stage and histological grade in UBUC. Moreover, the in vitro study shows that TGFB1I1 affects cell proliferation, viability, migration and wound healing. The EMT markers also decreased upon TGFB1I1 knockdown. In this study, we identified that TGFB1I1 regulates UC cell proliferation and viability and induces the EMT to facilitate cell migration in vitro, leading to its essential role in promoting tumor aggressiveness in both UTUC and UBUC.<\/jats:p>","DOI":"10.1002\/kjm2.12798","type":"journal-article","created":{"date-parts":[[2024,1,5]],"date-time":"2024-01-05T11:06:56Z","timestamp":1704452816000},"page":"269-279","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":6,"title":["TGFB1I1 promotes cell proliferation and migration in urothelial carcinoma"],"prefix":"10.1002","volume":"40","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-0101-7061","authenticated-orcid":false,"given":"Peir\u2010In","family":"Liang","sequence":"first","affiliation":[{"name":"Department of Pathology Kaohsiung Medical University Hospital  Kaohsiung 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