Exposure to N-nitroso compounds in a population of high liver cancer regions in thailand : Volatile nitrosamine (VNA) levels in Thai food.
The recent case-control studies in Thailand indicate that a high incidence of liver cancer in Thailand has not been associated with common risk factors such as hepatitis B infection, aflatoxin intake and alcohol consumption.
While the infestation by the liver fluke Opisthorchis viverrini (OV) accounted for the high risk in north-east Thailand, there was no such exposure in the other regions of the country where the incidence of liver cancer is also high.
Case-control studies suggest that exposure to exogenous and possibly endogenous nitrosamines in food or tobacco in betel nut and cigarettes may play a role in the development of hepatocellular carcinoma (HCC), while OV infestation and chemical interaction of nitrosamines may also be aetiological factors in the development of cholangiocarcinoma (CCA).
Over 1800 samples of fresh and preserved food were systematically collected and tested between 1988 and 1996.
All the food items identified by anthropological studies to be consumed frequently in four major regions of Thailand were analysed for volatile nitrosamines using gas chromatography combined with a thermal energy analyser.
Relatively high levels of N-nitrosodimethylamine (NDMA), N-nitrosopiperidine (NPIP) and N-nitrosopyrrolidine (NPYR) were detected in fermented fish ( « Plasalid »). NDMA was also detected at levels ranging from trace amounts to 66.5 mug/kg in several salted and dried fish ( « Larb-pla'and » Pla-siu ). (...)
Mots-clés Pascal : Nitrosamine, Composé nitroso, Teneur, Tumeur maligne, Foie, Alimentation, Epidémiologie, Etiologie, Thaïlande, Asie, Homme, Toxicité, Appareil digestif pathologie, Foie pathologie
Mots-clés Pascal anglais : Nitrosamine, Nitroso compound, Content, Malignant tumor, Liver, Feeding, Epidemiology, Etiology, Thailand, Asia, Human, Toxicity, Digestive diseases, Hepatic disease
Notice produite par :
Inist-CNRS - Institut de l'Information Scientifique et Technique
Cote : 99-0379645
Code Inist : 002B04B. Création : 22/03/2000.