Progress of gastric cancer etiology: N-nitrosamides 1999s

Table 1 Comparison of formation of NMU at various doses of NaNO₂ in gastric lumen of pig model in vivo and control experiments in vitro[9,22]

Formation of NMU
Amount of NaNO2(μmol)	Concentration (μmol/L)		Total amount (μmole)
	in vivo	in vivo	in vivo	in vivo
3480	25.40	29.20	4.27	1.75
870	7.97	6.48	1.91	0.38
220	ND	2.77	ND	0.17

ND, below detection limit; the value was the average of two independent experiments.