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• W4251642321 endingPage "18" @default.
• W4251642321 startingPage "11" @default.
• W4251642321 abstract "It is generally accepted that genetic and environmental factors combine in the aetiology of bowel cancer. Epidemiological studies have shown that the environmental factors effects are shown more clearly in the left colon, and that they are related to living in western societies whose diets contain high levels of protein, fat and energy. There has been recent awareness that consumption of alcoholic beverages, particularly beer, may be causally related to cancers of the left colon and rectum. This review attempts to relate the general epidemiological data to more specific mechanisms of colorectal carcinogenesis. Dimethylhydrazine (DMH) and N-nitroso chemicals are potent colorectal carcinogens in animals. They have not been thought very relevant to humans because their existence in appropriate forms in the environment has been debatable and analytical methods for the specific detection of non-volatile nitrosamines and nitrosamides have not been available. Recently, however, relevant alkylating activity has been detected in foods incubated in quasi-gastric conditions, and several epidemiological studies have shown a protective effect for Vitamin C, which may inhibit the development of rectal cancer through beer consumption. As Vitamin C prevents nitrosation and as precursors of nitrosamides are present in prepared foods, further dietary studies with hypotheses based on N-nitroso carcinogenesis are required. Unfortunately, these studies will probably not show clear doseresponse relationships. Many of the complex reasons for this are discussed: however, one of the most important could be related to an interplay between inherited and environmental factors. The inherited factors demonstrated by chromosomal analysis in cancer and polypo, yndrornes are a reminder that other genetic (oncogenetic) changes may occur in sporadic colorectal cancer. Oncogenetic changes may be related to infective agents because of homology between viral and colorectal carcinoma oncogenes. Viruses and chemicals act synergistically to produce colorectal cancers in animals. Furthermore, cancer prevalence may’ be determined by the frequency of mucosal cells which are susceptible to malignant transformation. This susceptibility may be related to recently demonstrated cell and sialomucin heterogeneity." @default.
• W4251642321 created "2022-05-12" @default.
• W4251642321 creator A5010967614 @default.
• W4251642321 date "1990-01-01" @default.
• W4251642321 modified "2023-10-14" @default.
• W4251642321 title "COLORECTAL CARCINOGENESIS" @default.
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• W4251642321 doi "https://doi.org/10.1111/j.1445-2197.1990.tb07346.x" @default.
• W4251642321 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/2183744" @default.
• W4251642321 hasPublicationYear "1990" @default.
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