68 cases of gastric carcinoma and 31 tissue samples adjoining the carcinomas were investigated by impulse cytophotometry, cytomorphology and histology, respectively. Differentiated adenocarcinoma tended to aneuploidy, while undifferentiated carcinoma often showed euploidy. The adjoining mucosa was characterized by polymorphism of the mucosa superficial epithelial cells and the histograms showed slight abnormalities.
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