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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.
BMC Cancer 2009; 9:122BC

Abstract

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 São Paulo, Brazil, with 458 age-matched pairs of Brazilian women. Energy-adjusted intakes of folate, vitamin B6, and vitamin B12 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 B6, or vitamin B12 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 B6 (P = 0.043), and between the MTHFR C677T polymorphism and folate (P = 0.043) or vitamin B12 (P = 0.022).

CONCLUSION

MTHFR polymorphisms and dietary intake of folate, vitamin B6, and vitamin B12 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.

Authors+Show Affiliations

Epidemiology and Prevention Division, Research Center for Cancer Prevention and Screening, National Cancer Center, Tokyo, Japan. ema@ncc.go.jpNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

19389261

Citation

Ma, Enbo, et al. "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." BMC Cancer, vol. 9, 2009, p. 122.
Ma E, Iwasaki M, Junko I, et al. 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. BMC Cancer. 2009;9:122.
Ma, E., Iwasaki, M., Junko, I., Hamada, G. S., Nishimoto, I. N., Carvalho, S. M., ... Tsugane, S. (2009). 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. BMC Cancer, 9, p. 122. doi:10.1186/1471-2407-9-122.
Ma E, et al. 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. BMC Cancer. 2009 Apr 24;9:122. PubMed PMID: 19389261.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - 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. AU - Ma,Enbo, AU - Iwasaki,Motoki, AU - Junko,Ishihara, AU - Hamada,Gerson Shigeaki, AU - Nishimoto,Ines Nobuko, AU - Carvalho,Solange Maria Torchia, AU - Motola,Juvenal,Jr AU - Laginha,Fábio Martins, AU - Tsugane,Shoichiro, Y1 - 2009/04/24/ PY - 2008/06/25/received PY - 2009/04/24/accepted PY - 2009/4/25/entrez PY - 2009/4/25/pubmed PY - 2009/6/10/medline SP - 122 EP - 122 JF - BMC cancer JO - BMC Cancer VL - 9 N2 - 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 São Paulo, Brazil, with 458 age-matched pairs of Brazilian women. Energy-adjusted intakes of folate, vitamin B6, and vitamin B12 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 B6, or vitamin B12 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 B6 (P = 0.043), and between the MTHFR C677T polymorphism and folate (P = 0.043) or vitamin B12 (P = 0.022). CONCLUSION: MTHFR polymorphisms and dietary intake of folate, vitamin B6, and vitamin B12 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. SN - 1471-2407 UR - https://www.unboundmedicine.com/medline/citation/19389261/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_ L2 - https://bmccancer.biomedcentral.com/articles/10.1186/1471-2407-9-122 DB - PRIME DP - Unbound Medicine ER -