Gastric tissue
In the carcinogen-treated group, 2 of 10 rats (20%) developed glandular dysplasia and adenocarcinoma. In addition, mucous-gland hyperplasia was observed in 6 of 10 rats (60%). Mucous-gland hyperplasia is a benign physiologic change seen in chronic gastritis. In contrast, in the carcinogen plus MRN-100-treated group, mucous-gland hyperplasia, glandular dysplasia, and adenocarcinoma were not observed (Table 3).