CLDN18 and neoplasm: One hundred eighty of 421 GCs were CLDN18.2-positive; these showed the following distribution of mucin phenotypes: intestinal 29 cases (16.1% of CLDN18.2-positive tumours), gastric 32 cases (17.8%), mixed 78 cases (43.3%), and unclassified 41 cases (22.8%).