KRT8 and neoplasm: Notably, tumor characterization in these models revealed three distinct tumor types in Ad-K8-Cre-injected mice (i.e., Type 1: KRT8+KRT14− luminal tumor cells surrounded by KRT14+KRT8− basal tumor cells; Type 2: KRT8/KRT14 double-positive; Type 3: KRT8+KRT14− luminal only).