folate/breast neoplasms

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Folate intake, alcohol use, and postmenopausal breast cancer risk in the Prostate, Lung, Colorectal, and Ovarian Cancer Screening Trial.

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BACKGROUND Several epidemiologic studies suggest that higher folate intakes are associated with lower breast cancer risk, particularly in women with moderate alcohol consumption. OBJECTIVE We investigated the association between dietary folate, alcohol consumption, and postmenopausal breast cancer

Joint effects of folate intake and one-carbon-metabolizing genetic polymorphisms on breast cancer risk: a case-control study in China.

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This study aimed to examine the joint effects of folate intake, polymorphisms of 5,10- methylenetetrahydrofolate reductase (MTHFR), methionine synthesis reductase (MTRR) and methionine synthase (MTR) genes and breast cancer risk. A case-control study of 570 consecutively recruited breast cancer

[Folate and breast cancer risk: a systematic review].

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An increased folate intake may be beneficial in deficient populations. However, in women with adequate levels it may not deliver additional benefits while it may increase the risk for some forms of cancer. A systematic literature review of benefits or risks of folate in the development of breast

Interaction of nitrate and folate on the risk of breast cancer among postmenopausal women.

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Ingested nitrate can be endogenously reduced to nitrite, which may form N-nitroso compounds, known potent carcinogens. However, some studies have reported no or inverse associations between dietary nitrate intake and cancer risk. These associations may be confounded by a protective effect of folate,

Folate intake, methylenetetrahydrofolate reductase polymorphisms, and breast cancer risk in women from the Malmö Diet and Cancer cohort.

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BACKGROUND Single nucleotide polymorphisms (SNP) of the folate-metabolizing enzyme methylenetetrahydrofolate reductase (MTHFR) may modify associations between folate intake and breast cancer. We examined if the association between tertiles of dietary folate equivalents (DFE) and breast cancer was

The effect of methotrexate on intracellular folate pools in human MCF-7 breast cancer cells. Evidence for direct inhibition of purine synthesis.

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This report details the effects of methotrexate on the intracellular folate pools of the MCF-7 human breast cancer cell line. To achieve this goal, we designed a high-pressure liquid chromatography system capable of separating the physiologic folates. The folate pools were quantitated following

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.

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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

Isolation of a gene encoding a human reduced folate carrier (RFC1) and analysis of its expression in transport-deficient, methotrexate-resistant human breast cancer cells.

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Our laboratory has previously reported the isolation of a murine cDNA which restores reduced folate carrier (RFC) activity and methotrexate (MTX) sensitivity to a MTX-resistant, transport-deficient human breast cancer cell line (MTXR ZR-75-1) (K. H. Dixon et al., J. Biol. Chem., 269: 17-20, 1994).

Plasma folate, vitamin B-6, and vitamin B-12 and breast cancer risk in BRCA1- and BRCA2-mutation carriers: a prospective study.

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BACKGROUND B vitamins [vitamins B-6, B-9 (folate), and B-12] play important roles in nucleotide biosynthesis and biological methylation reactions, aberrancies of which have all been implicated in carcinogenesis. In the general population, evidence has suggested that high circulating folate and folic

Folate conjugase activity in the plasma and tumors of breast-cancer patients.

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The activity of folate conjugase (pteroylpolyglutamate hydrolase, EC 3.4.22.12) was measured in plasma from normal subjects and patients with breast cancer using pteroylglutamyl-gamma-glutamyl-gamma-(U14C) glutamate as the substrate. Conjugase assays also were performed on samples of breast-tumor

Associations of polymorphisms of folate cycle enzymes and risk of breast cancer in a Brazilian population are age dependent.

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Polymorphisms in genes involved in folate metabolism have been shown to be implicated in breast cancer risk but with contradictory results. In this case-control study, we investigated the association between MTHFR C677T and A1298C, TYMS 5'-UTR, MTR A2756G and cSHMT C1420T and also the folate carrier

Targeted Proteomics Enables Simultaneous Quantification of Folate Receptor Isoforms and Potential Isoform-based Diagnosis in Breast Cancer.

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The distinct roles of protein isoforms in cancer are becoming increasingly evident. FRα and FRβ, two major isoforms of the folate receptor family, generally have different cellular distribution and tissue specificity. However, the presence of FRβ in breast tumors, where FRα is normally expressed,

Lack of an effect of breast cancer resistance protein (BCRP/ABCG2) overexpression on methotrexate polyglutamate export and folate accumulation in a human breast cancer cell line.

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Accumulation of methotrexate (MTX) and its polyglutamates (PGs) has been recognized as an important factor in MTX efficacy. We have previously described a multidrug-resistant human breast cancer cell line, MCF7/MX, that exhibits reduced accumulation of total MTX as well as MTX-PGs, and that is

The effect of folate-related SNPs on clinicopathological features, response to neoadjuvant treatment and survival in pre- and postmenopausal breast cancer patients.

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This study aimed to investigate the relationship of ten single nucleotide polymorphisms (SNPs) in the MTHFR, MTR, MTRR, DHFR, MTHFD1, TS, RFC1 and DNMT3b genes with cancer survival, therapeutic response to neoadjuvant chemotherapy and clinicopathological characteristics in 300 pre- and

Polymorphisms in folate metabolizing enzymes and transport proteins and the risk of breast cancer.

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BACKGROUND An accumulating body of evidence suggests that there is an inverse relationship between the intake of folate (a water-soluble B-vitamin) and the risk of developing breast cancer. Individual variation in the genes involved in the transport of folate, or its metabolism, may affect risk, or

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