Then, by staining for squamous epithelium markers (including KRT5, KRT6A, SFN, and KRT14) and columnar epithelium markers (including EPCAM and KRT8), groups 3, 7, and 10 were identified as squamous cancer cells, and groups 5, 6, and 8 were identified as adenocarcinoma cells (Figures 5D, E). Here, KRT5 is linked to adenocarcinoma.