Intake of total cruciferous vegetable and its contents of glucosinolates and isothiocyanates, glutathione S-transferases polymorphisms and breast cancer risk: a case-control study in China.
Cruciferous vegetables contain high levels of glucosinolates (GSL) and isothiocyanates (ITC). ITC are known to induce glutathione S-transferases (GST) and thus exert their anticarcinogenic effects. This study explored the combined effects of cruciferous vegetable, GSL and ITC intake and GST polymorphisms on breast cancer risk. A total of 737 breast cancer cases and 756 controls were recruited into this case-control study. OR and 95 % CI were assessed by multivariable logistic regression. Higher cruciferous vegetable, GSL and ITC intakes were inversely associated with breast cancer risk, with adjusted OR of 0·48 (95 % CI 0·35, 0·65), 0·54 (95 % CI 0·40, 0·74) and 0·62 (95 % CI 0·45, 0·84), respectively. Compared with women carrying the GSTP1 rs1695 wild AA genotype and high cruciferous vegetable, GSL or ITC intake, carriers of the AA genotype with low cruciferous vegetable, GSL and ITC intake had greater risk of breast cancer, with adjusted OR of 1·43 (95 % CI 1·01, 1·87), 1·34 (95 % CI 1·02, 1·75) and 1·37 (95 % CI 1·05, 1·80), respectively. Persons with the GSTM1-null genotype and lower intake of cruciferous vegetables, GSL and ITC had higher risk of breast cancer than those with the GSTM1-present genotype and higher intake, with OR of 1·42 (95 % CI 1·04, 1·95), 1·43 (95 % CI 1·05, 1·96) and 1·45 (95 % CI 1·06, 1·98), respectively. Among women possessing the GSTT1-present genotype, low intake of cruciferous vegetables, GSL or ITC was associated with higher risk of breast cancer. But these interactions were non-significant. This study indicated that there were no significant interactions between cruciferous vegetable, GSL or ITC intake and GST polymorphisms on breast cancer risk.
['Zhang|Nai-Qi|NQ|0000-0002-0668-7822', 'Mo|Xiong-Fei|XF|', 'Lin|Fang-Yu|FY|', 'Zhan|Xiao-Xia|XX|', 'Feng|Xiao-Li|XL|', 'Zhang|Xin|X|', 'Luo|Hong|H|', 'Zhang|Cai-Xia|CX|']
D000328:Adult D000368:Aged D001943:Breast Neoplasms D016022:Case-Control Studies D002681:China D004032:Diet D005260:Female D020022:Genetic Predisposition to Disease D005961:Glucosinolates D005982:Glutathione Transferase D006801:Humans D017879:Isothiocyanates D008875:Middle Aged D011110:Polymorphism, Genetic D012307:Risk Factors D014675:Vegetables
Cruciferous vegetables Glucosinolates Isothiocyanates Glutathione S-transferase polymorphisms Breast cancer