Signaling pathways in diseases mediated by UCA1. UCA1 regulates key signaling pathways by acting as a competitive endogenous RNA, thus affecting biological activities, such as cell proliferation, apoptosis, migration, invasion and drug resistance in cancers and non-cancerous diseases. UCA1, urothelial carcinoma associated 1; CCND1, cyclin D1; CDK6, cyclin-dependent kinase 6; CLIC1, chloride intracellular channel 1; CREB1, cAMP response element-binding protein 1; CXCR4, C-X-C chemokine receptor type 4; DLL4, Delta-like 4; EZH2, enhancer of zeste homolog 2; HULC, highly upregulated in liver cancer; MEF2C, myocyte enhancer factor 2C; METTL3, methyltransferase-like 3; MMP-9, matrix metalloproteinase-9; mTOR, mammalian target of rapamycin; RAC1, RAS-related C3 botulinus toxin substrate 1; TGF-β, transforming growth factor-β; TIMP2, tissue inhibitor of metalloproteinase-2; YAP, yes-associated protein; miR, microRNA; EMT, epithelial-to-mesenchymal transition; lncRNA, long non-coding RNA.