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Abnormal lactic dehydrogenase patterns in carcinoma of stomach and in peritumoral tissues.

Segments of gastric mucosa from 32 surgical and biopsy specimens containing gastric carcinoma have been studied to determine the total content of lactate dehydrogenase (LDH). The LDH isoenzyme distribution patterns in tumoral tissues have been compared to that of peritumoral tissue and to the gastric mucosa of a healthy control group. LDH isoenzyme activity in the samples from tumoral tissue was significantly increased. The adjacent peritumoral tissue had a slight increment in the polypeptide M as compared to the distant and normal tissue. This suggests that LDH isoenzyme measurement may prove a valuable addition to histologic study, in the recognition of the tumoral distribution in stomach carcinoma.