MUC5AC and carcinoma: Although Kushima and Hattori [12] firstly proposed an entity of gastric-type carcinoma and terminologically seemed homologous to the IT one, the carcinoma cells of this type closely resemble normal foveolar cells on the basis of tissue morphology and mucin properties and are considered to have been derived from foveolar hyperplasia or pyloric gland adenoma [12, 13].