Such classification is achieved based on genomic and transcriptomic analyses, which point to differential expression of specific markers among tumors: the basal cytokeratins KRT5/KRT6A and KRT14, as hallmarks of basal BlCa, and the luminal markers FOXA1 and GATA3, as hallmarks of luminal cancer. The gene discussed is KRT14; the disease is bladder transitional cell carcinoma.