Urinary excretion of N-nitrosamino acids and nitrate by inhabitants of high- and low-risk areas for stomach cancer in Poland.


Urine samples were collected from 96 inhabitants of a high-risk rural area and a low-risk urban area for stomach cancer in Poland, according to the following protocol: (1) when they were undosed; (2) after ingestion of proline 3 times a day; and (3) after ingestion of proline together with vitamin C 3 times a day. The samples were analyzed for N-nitrosamino… (More)


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