Detection of H pylori antibody profile in serum by protein array

Table 1 Cutoff values determined in H pylori antibody negative sera

Items	Number	Mean grey values	SD	Cutoff values
Anti-UreB IgG	400	18.060	3.041	27.183
Anti-CagA IgG	400	17.992	3.518	28.546
Anti-VacA IgG	400	17.730	3.224	27.402

Table 2 Results detected by ELISA and protein array

Protein array	ELISA
	Anti-UreB IgG		Anti-CagA IgG		Anti-VacA IgG
	P	N	P	N	P	N
P	114	3	104	4	97	2
N	8	55	5	67	4	77

P : positive; N: negative.

Table 3 Relation of diseases to H pylori antibody (IgG) profiles

Diseases	Numbers
	Total	RUT	Anti-UreB	Anti-CagA	Anti-VacA
GC	32	30	26a	25	22
PUD	45	43	39c	37	36
NUD	103	58	52	46	41

^aP < 0.005 vs NUD;

^cP < 0.005 vs NUD.