Although the gastric differentiated adenocarcinoma has been thought to develop via a intestinal metaplasia-carcinoma sequence [1-4], there are some disproofs [5] that the gastric differentiated adenocarcinoma develops having a poor relationship to the intestinal metaplasia, from new mucin examinations for minute-size carcinoma [6,7] in same type. Here, MUC5AC is linked to carcinoma.