KRT1 and bladder transitional cell carcinoma: We first examined the transcript expression of keratins associated with the basal subtype of MIUC (KRT1, KRT5, KRT6A, KRT14, and KRT16) in human bladder urothelial carcinoma (BLCA) tumors vs. normal tissue using GEPIA2 (Gene Expression Profiling Interactive Analysis, http://gepia2.cancer-pku.cn/#index, accessed on 25 September 2024) [34].