[Pathology of stomach cancer].

Dysplasias, the best-defined precancerous lesion of the stomach, are seldomly found alone, but most commonly in association with carcinoma. The established classification of gastric carcinomas includes the site, histological tumour type, grade of differentiation, R classification and pTNM classification with stage grouping. The Laurén classification is important in operative planning (extent of operation on the stomach and oesophagus). Additional conventional classification parameters are at present not proven independent prognostic factors.