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Stillwell, W.G. et al.

Comparison of urinary nitrate, N-nitrosoproline, 7-methylguanine and 3-methyladenine levels in a human population at risk for gastric cancer.

We have measured the urinary excretion of nitrate, N-nitrosoproline, 3-methyladenine and 7-methylguanine in a human population at high risk for gastric cancer. A strong correlation was observed between nitrate and N-nitrosoproline excretion (p less than 0.00000); statistically significant correlations (p less than 0.05) were also observed for N-nitrosoproline with 3-methyladenine (p = 0.003) and with 7-methylguanine (p = 0.03) and for 7-methyl-guanine with nitrate (p = 0.02), although these correlations were sensitive to outliers. Smokers appeared to excrete slightly higher levels of 3-methyladenine than nonsmokers; no other difference was observed between smokers and nonsmokers or between drinkers and nondrinkers. The correlation between N-nitrosoproline excretion and nitrate excretion supports the hypothesis that elevated endogenous nitrate levels may contribute to elevated endogenous formation of N-nitroso compounds.[1]

References

Comparison of urinary nitrate, N-nitrosoproline, 7-methylguanine and 3-methyladenine levels in a human population at risk for gastric cancer. Stillwell, W.G., Xu, H.X., Glogowski, J., Wishnok, J.S., Tannenbaum, S.R., Correa, P. IARC Sci. Publ. (1991) [Pubmed]

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