Vegetable/fruit, smoking, glutathione S-transferase polymorphisms and risk for colorectal cancer in Taiwan

Table 6 Smoking specific risk for colorectal cancer for the combined effects of GST genotypes and vegetable/fruit consumption in men.

Genotype	Vegetable/fruit consumption	Non-smokers			Smokers
		Cases	Controls	OR (95% CI)1	Cases	Controls	OR (95% CI)1
GSTT1
Present	Low	28	16	0.85 (0.33-2.21)	73	58	0.85 (0.51-1.41)
Null	High	45	55	0.41 (0.18-0.96)	59	65	0.66 (0.39-1.11)
Present	High	25	65	0.17 (0.07-0.42)	52	80	0.43 (0.25-0.73)
P for interaction				0.23			0.49
GSTP1
With G	Low	19	10	1.00	41	39	1
A/A	Low	32	19	0.80 (0.30-2.15)	115	75	1.21 (0.69-2.12)
With G	High	25	33	0.41 (0.15-1.10)	40	40	0.96 (0.49-1.88)
A/A	High	45	88	0.21 (0.09-0.52)	71	105	0.55 (0.31-0.98)
P for interaction				0.48			0.07

¹Adjusted for age, physical activity, coffee, alcohol, meat and fish/shrimp.