Folatos y riesgo de cáncer de mama: revisión sistemática
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An increased folate intake may be benefi cial in defi cient populations. However, in women with adequate levels it may not deliver additional benefi ts while it may increase the risk for some forms of cancer. A systematic literature review of benefi ts or risks of folate in the development of breast cancer was performed using MEDLINE, systematic review of selected articles and references of the selected articles looking specifi cally at serum folate levels, dietary folate intake or total folate intake and the risk of developing breast cancer. Fourteen case-control studies, fourteen cohort studies, seven case-control nested studies, two randomized trials and two meta-analyses were selected for analysis based on pre-established criteria. The reviewed evidence does not support the hypothesis that higher intakes of dietary folate reduce the risk for breast cancer. Some studies showed a higher risk of breast cancer in populations exposed to high folate intake post fortifi cation, especially when folic acid is used. The results support the need to be cautious and to limit the exposure of women to high intakes of folic acid, especially in countries with mandatory food fortifi cation.