Thus, it would be of interest to compare the cell surface presence of CLDN18.2 (via antibodies) and (via YFP-cCPE) that of cCPE-receptor claudins indicated to be expressed in gastric cancer (CLDN1 to −4, −6, −7 [12,74]) in parental tumor tissue as well as the respective organoids. This evidence concerns the gene CLDN1 and gastric cancer.