Table 4.

Age and gender adjusted Odds Ratios (95% CI) of gastric cancer for selected gene-gene interaction analyses

		GSTT1		SULT1A1
		Present	Null	Arg/Arg	His car.
NAT2	Fast	1*	1. 38 (0.63–3.01)	1*	1.45 (0. 71–2.95)
	cases/controls	30/93	13/29	23/74	20/48
	Slow	1.07 (0.61–1.88)	3.00 (1.52–5.93)	1.40 (0. 75–2.60)	2.00 (1.03–3.89)
	cases/controls	36/103	26/28	35/81	29/50
		p for interaction† = 0.17		p for interaction = 0.97
		AP‡ = 52%		AP = 8%
SULT1A1	Arg/Arg	1*	1.53 (0.86–2.71)	-	-
	cases/controls	35/122	22/34
	His carriers	2.30 (1.18–4.45)	2.87 (1.36–6.05)	-	-
	cases/controls	31/75	17/23
		p for interaction = 0.70
		AP = 1%

* Reference category; † By likelihood ratio test; ‡ Attributable Proportion due to biological interaction (see methods)