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dc.contributor.authorMortensen, Jan Helge Seglemen_US
dc.contributor.authorØyen, Ninaen_US
dc.contributor.authorFomina, Tatianaen_US
dc.contributor.authorMelbye, Madsen_US
dc.contributor.authorTretli, Steinaren_US
dc.contributor.authorVollset, Stein Emilen_US
dc.contributor.authorBjørge, Toneen_US
dc.PublishedCancer Epidemiology 2015, 39(6):805-811eng
dc.description.abstractBackground: There is evidence that increased intake of folate protects against the development of several types of cancer. Some studies have, however, raised concern about the safety of folate in relation to cancer risk. Here we examined the risk of maternal cancer after intake of supplemental folic acid in pregnancy. Methods: This is a population-based cohort study comprising 429,004 women with data from the Medical Birth Registry of Norway, the Cancer Registry of Norway, and other national registries from 1999 to 2010. Altogether 3781 cancer cases were identified during follow-up (average 7 years). Cox proportional hazards regression models were used to estimate hazard ratios of maternal cancer according to folic acid use prior to and during one or two or more pregnancies as compared to no supplement use. Results: Folic acid supplementation use had no overall effect on cancer risk in women using folic acid supplementation in one (HR 1.08; 95% CI 1.00–1.18) or two or more pregnancies (HR 1.06; 95% CI 0.91– 1.22) (ptrend = 0.12). Analyses of 13 cancer types revealed no associations between folic acid and cancer. Conclusion: Folic acid supplementation before and during pregnancy had no overall effect on maternal cancer risk. Impact: Folic acid substitution before and/or during pregnancy does not increase the short-term overall maternal cancer risk.en_US
dc.rightsAttribution CC BY-NC-NDeng
dc.subjectFolic acid supplementationeng
dc.subjectMaternal cancereng
dc.subjectCohort studyeng
dc.titleSupplemental folic acid in pregnancy and maternal cancer risken_US
dc.typePeer reviewed
dc.typeJournal article
dc.rights.holderCopyright 2015 The Authors

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