UCA1 and squamous cell carcinoma: Urothelial carcinoma-associated 1 (UCA1) is a long non-coding RNA (lncRNA) with three exons that encode a 1.4 kb isoform, which acts as a tumor-enhancing gene, and a 2.2 kb isoform, characterized as the cancer upregulated drug-resistant gene in doxorubicin (DOX)-resistant epidermoid carcinoma A431 cells [22].