[Early cancer of the stomach and precancerous conditions].

Based on the operation material of 152 subjects with early gastric cancer the lesions preceding it were followed up. It was found that these have a decisive influence on the anatomical shape of blastoma. Polypoid cancer arises on the background of polyps or chronic gastritis, while gastric ulcer underlie flat and ulcerous cancer. Carcinoma arising in the zone of gastric ulcer made up 79% of all cases of cancer. Early cancers of different origin are distinguished by the histological structure, manner of growth and the rate of proliferation, whereas patients with such lesions--by age and sex. The development of flat or ulcerous tumor due to ulcer is related with the localization of ulcer in the stomach. So, flat cancer arises in healed or healing mostly pyloric ulcer, while ulcerous cancer--in callous ulcer of the gastric angle. Special attention is given to some difficulties in diagnosis of flat carcinoma making 61% of all early gastric cancers.