Progress of gastric cancer etiology: N-nitrosamides 1999s

Table 3 Relationship between presence of total N-nitrosamides in gastric juice samples from subjects with pathological changes in gastric mucosa

Gastric mucosal status	Positive rate of total N-nitrosamides in gastric juice samples (%)**
	High risk areas		Low risk area
	Putian[13]	Linqu[28]	Cangshan[28]
*N and CSG	2/12 (16.7)	1/4 (25.0)	4/23 (17.4)
CAG	10/14 (71.4)b	38/76 (50.0)c	18/56 (32.1)
CAG and IM	12/13 (92.3)	17/56 (28.8)e	0/4 (0.0)
CAG and DYS 12/13 (92.3)		18/44 (40.9)	5/10 (50.0)

*N, normal mucosa; CSG, chronic superficial gastritis; CAG, chronic at rophic gastritis; IM, intestinal metaplasia; DYS, dysplasia;

^**sample was classified as N-nitrosamides-positive when more than 184 nmol/L (de tection limit) of the chemicals was detected;

^bSignificantly different fr om N and CSG with P < 0.01;

^cSignificantly different from low risk a rea with P < 0.05;

^eSignificantly different from CAG with P < 0.05.