TACSTD2 and cancer: To understand the molecular heterogeneity of the cells at the final step in gastric carcinogenesis and identify potential markers for dysplastic cell lineages, we focused on clusters 11 and 14, which were designated as dysplastic or cancer cell clusters on the basis of the expression of TACSTD2, the transcript for TROP2 protein (Supplementary Figure 2C and Supplementary Figure 3B).21