Bladder cancer 4 (BLCA-4), minichromosomal maintenance 5 (MCM5), human telomerase reverse transcriptase (hTERT), circulating tumor cells (CTCs), and cytokeratin 20 (CK-20) have been reported to be biomarkers of urothelial carcinoma. Here, KRT20 is linked to urothelial carcinoma.