Gene/Protein Disease Symptom Drug Enzyme Compound
Pivot Concepts:   Target Concepts:
Query: UMLS:C0038358 (gastric ulcer)
 5,179 document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)

This study was undertaken to determine the effect of ulcer induced by iodoacetamide on the development of gastric carcinoma by N-methyl-N'-nitro-N-nitrosoguanidine in male Wistar rats. Fifty-six of the 62 ulcers induced by IAM were located in the fundic gland area along the limiting ridge. The incidence of fundic carcinoma was 16% in the groups treated with IAM and MNNG, while no fundic carcinoma was found in the group treated with MNNG alone. This difference was statistically significant. All the carcinomas in the fundic gland area were confined within the ulcer itself or its scar tissue, produced by IAM. These findings indicate that if an ulcer is present, carcinoma develops even in the fundic mucosa which is, if intact, resistant to the carcinogenic stimulation of MNNG. It was concluded that gastric ulcer predisposes the development of gastric carcinoma.
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PMID:The effect of iodoacetamide-induced fundic ulcers on gastric carcinogenesis produced by N-methyl-N'-nitro-N-nitrosoguanidine in rats. 60 48

The purpose of this experiment was to determine whether chronic gastric ulcers in the rat are predisposed to tumor formation when exposed to a usually noncarcinogenic dose of the carcinogen, N-Methyl-N'-nitro-N-nitrosoguanidine (MNNG). Two groups of rats were prepared; one subjected to a standard ulcer-producing operation, the other as control. Both groups were given oral MNNG (100 mg/liter as drinking water) for 12 weeks, the carcinogen was then stopped and replaced with tap water, and the experiment terminated at 52 weeks. Results showed that a low dose of carcinogen (200 mg) did not induce tumor formation in any of the normal rats. In the presence of a chronic gastric ulcer, only intestinal metaplasia and hyperplastic glandular nodules were observed, but there were no gastric tumors. It is concluded that the presence of a chronic gastric ulcer did not increase the likelihood of gastric tumor formation in rats treated with a noncarcinogenic dose of the carcinogen MNNG.
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PMID:Chronic gastric ulcers are not predisposed to tumor formation when exposed to a low dose of carcinogen. 374 98