Dietary intake of folate, vitamin B6, and vitamin B12, genetic polymorphism of related enzymes, and risk of breast cancer: a case-control study in Brazilian women

被引：78

作者：

Ma, Enbo ^{[1
]}

Iwasaki, Motoki ^{[1
]}

Junko, Ishihara ^{[1
,2
]}

Hamada, Gerson Shigeaki ^{[3
]}

Nishimoto, Ines Nobuko ^{[4
]}

Torchia Carvalho, Solange Maria ^{[5
]}

Motola, Juvenal, Jr. ^{[6
]}

Laginha, Fabio Martins ^{[6
]}

Tsugane, Shoichiro ^{[1
]}

机构：

[1] Natl Canc Ctr, Res Ctr Canc Prevent & Screening, Epidemiol & Prevent Div, Chuo Ku, Tokyo 1040045, Japan

[2] Tokyo Univ Agr, Dept Nutr, Jr Coll, Setagaya Ku, Tokyo 1568502, Japan

[3] Nikkei Dis Prevent Ctr, Sao Paulo, Brazil

[4] Hosp AC Camargo Fund Antonio Prudente, Head & Neck Surg & Otorhinolaryngol Dept, Stat Sect, Sao Paulo, Brazil

[5] Hosp AC Camargo Fund Antonio Prudente, Dept Mastol, Sao Paulo, Brazil

[6] Hosp Perola Byington, Dept Breast Surg, Sao Paulo, Brazil

来源：

BMC CANCER | 2009年 / 9卷

基金：

日本学术振兴会;

关键词：

ONE-CARBON METABOLISM; METHYLENETETRAHYDROFOLATE REDUCTASE MTHFR; NESTED-CASE-CONTROL; PLASMA FOLATE; POOLED METAANALYSIS; SUSCEPTIBILITY; ASSOCIATION; TAIWAN; MICRONUTRIENTS; HOMOCYSTEINE;

D O I：

10.1186/1471-2407-9-122

中图分类号：

R73 [肿瘤学];

学科分类号：

100214 ;

摘要：

Background: Several studies have determined that dietary intake of B vitamins may be associated with breast cancer risk as a result of interactions between 5,10-methylenetetrahydrofolate reductase (MTHFR) and methionine synthase (MTR) in the one-carbon metabolism pathway. However, the association between B vitamin intake and breast cancer risk in Brazilian women in particular has not yet been investigated. Methods: A case-control study was conducted in Sao Paulo, Brazil, with 458 age-matched pairs of Brazilian women. Energy-adjusted intakes of folate, vitamin B-6, and vitamin B-12 were derived from a validated Food Frequency Questionnaire (FFQ). Genotyping was completed for MTHFR A1298C and C677T, and MTR A2756G polymorphisms. A logistical regression model was used to calculate odds ratios (ORs) and 95% confidence intervals (95% CIs). Results: Neither dietary intake of folate, vitamin B-6, or vitamin B-12 nor MTHFR polymorphisms were independently associated with breast cancer risk. Analysis stratified by menopausal status showed a significant association between placement in the highest tertile of folate intake and risk of breast cancer in premenopausal women (OR = 2.17, 95% CI: 1.23-3.83; P-trend = 0.010). The MTR 2756GG genotype was associated with a higher risk of breast cancer than the 2756AA genotype (OR = 1.99, 95% CI = 1.01-3.92; P-trend = 0.801), and statistically significant interactions with regard to risk were observed between the MTHFR A1298C polymorphism and folate (P = 0.024) or vitamin B-6 (P = 0.043), and between the MTHFR C677T polymorphism and folate (P = 0.043) or vitamin B-12 (P = 0.022). Conclusion: MTHFR polymorphisms and dietary intake of folate, vitamin B-6, and vitamin B-12 had no overall association with breast cancer risk. However, increased risk was observed in total women with the MTR 2756GG genotype and in premenopausal women with high folate intake. These findings, as well as significant interactions between MTHFR polymorphisms and B vitamins, warrant further investigation.

引用

页数：10