[Regenerative behavior of the human digestive tract under different pathologic conditions. In vitro autoradiographic study].

Tissue samples were obtained by operation on 23 patients with gastric and colonic carcinomas as well as gastric ulcers and polyps in the gastro-intestinal tract. The samples were taken from the pathological area and the "healthy" mucosa, respectively, 2 cm as the standardized distance from the respective place of finding. They were examined by means of in vitro-autoradiography with 3H-thymidine. The marking indiced obtained for benign, and malignant, tumours exceed distinctly the corrected labelled indiced of the normal mucous membrane. The marking values of the mucosa in the histologically inconspicuous vicinity of the carcinoma equal the carcinoma values. In correspondence to autoradiographic investigations by other authors and appropriate biopsy examinations in the neighbouring tumour regions, the in vitro-autoradiography is suggested to have some importance for the diagnosis of tumours.