Dietary folate and related micronutrients, folate-metabolising genes, and ovarian cancer survival

Dixon, S. C., Ibiebele, T. I., Protani, M. M., Beesley, J., deFazio, A., Crandon, A. J., Gard, G. B., Rome, R. M., Webb, P. M. and Nagle, C. M. (2014) Dietary folate and related micronutrients, folate-metabolising genes, and ovarian cancer survival. Gynecologic Oncology, 132 3: 566-572. doi:10.1016/j.ygyno.2013.12.025


Author Dixon, S. C.
Ibiebele, T. I.
Protani, M. M.
Beesley, J.
deFazio, A.
Crandon, A. J.
Gard, G. B.
Rome, R. M.
Webb, P. M.
Nagle, C. M.
Title Dietary folate and related micronutrients, folate-metabolising genes, and ovarian cancer survival
Journal name Gynecologic Oncology   Check publisher's open access policy
ISSN 1095-6859
0090-8258
Publication date 2014-03
Year available 2014
Sub-type Article (original research)
DOI 10.1016/j.ygyno.2013.12.025
Open Access Status
Volume 132
Issue 3
Start page 566
End page 572
Total pages 7
Place of publication Maryland Heights MO, United States
Publisher Academic Press
Collection year 2015
Language eng
Formatted abstract
Objective

Folate is essential for DNA synthesis and methylation and is implicated in tumour progression. Few studies have examined its role in ovarian cancer survival. Our objective was to determine relationships between intake of folate, related one-carbon nutrients, single nucleotide polymorphisms (SNPs) in folate-metabolising genes and survival following ovarian cancer diagnosis.

Methods

This analysis included 1270 women with invasive epithelial ovarian cancer diagnosed in 2002–2006. Pre-diagnostic and some post-diagnostic lifestyle, dietary, and sociodemographic information was collected via self-administered questionnaires. DNA samples were genotyped for SNPs in methylenetetrahydrofolate reductase (MTHFR), methionine synthase (MTR) and methionine synthase reductase (MTRR) genes. Adjusted hazard ratios (HRs) and 95% confidence intervals (CIs) were calculated using Cox regression.

Results

Multivariate analyses did not identify associations between higher pre-diagnostic intake of folate, folic acid, vitamins B2, B6, and B12, methionine, betaine or choline and survival overall. In stratified analyses, higher folic acid and folate intake was associated with significantly worse survival among women with mucinous tumours (HRs per 100 μg 1.30 and 1.43, respectively) and smokers (HRs per 100 μg 1.23 and 1.16 respectively). There was also a suggestion that higher supplemental folic acid use post-diagnosis was associated with worse survival (HR per 100 μg 1.03, 95%CI 1.00–1.05). MTHFR SNP rs2066470 was significantly associated with survival (per allele HR 0.81, 95%CI 0.67–0.98).

Conclusions

Our data provide little evidence that folate intake affects ovarian cancer survival. However, combined effects with smoking, and findings within the mucinous subtype and for post-diagnosis folic acid, warrant further investigation.
Keyword Ovarian cancer survival
Folate
One-carbon nutrients
Single nucleotide polymorphisms
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: Official 2015 Collection
School of Public Health Publications
 
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Created: Fri, 12 Sep 2014, 10:02:52 EST by Nyree Divitini on behalf of School of Public Health