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pubmed-article:2331325pubmed:abstractTextFive groups of rats (40 rats per group) were given five different varieties of Chinese tea (1 g/50 ml) and another two groups of rats (a positive control and a negative control) were given tap water as drinking water. Except for the negative control group, all the animals were intubated with N-nitrosomethylbenzylamine (NMBzA, 5 mg/kg body wt/week). Half of the animals in each group were sacrificed after 6 weeks and the remaining animals at the end of 12 weeks. The incidences of esophageal mucosa lesions (16-59%) at the end of 6 weeks were significantly lower in the tea-treated rats than in the positive control group (100%). The incidences of esophageal tumor at the end of 12 weeks (42-67%) were also significantly lower in the tea-treated groups than in the positive control group (90%). The same phenomenon was found with respect to the size and number of tumors in each tumor-bearing animal. The relative anticarcinogenic effects of the five varieties of Chinese tea were different. The Fujian oolong tea and jasmine tea exhibited the strongest effects. The results suggest that Chinese tea can effectively inhibit the carcinogenesis caused by an N-nitroso compound.lld:pubmed
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pubmed-article:2331325pubmed:authorpubmed-author:HanCClld:pubmed
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pubmed-article:2331325pubmed:dateRevised2007-11-15lld:pubmed
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pubmed-article:2331325pubmed:year1990lld:pubmed
pubmed-article:2331325pubmed:articleTitleThe effect of Chinese tea on occurrence of esophageal tumor induced by N-nitrosomethylbenzylamine in rats.lld:pubmed
pubmed-article:2331325pubmed:affiliationInstitute of Nutrition and Food Hygiene, Chinese Academy of Preventive Medicine, Beijing.lld:pubmed
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pubmed-article:2331325pubmed:publicationTypeComparative Studylld:pubmed
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