Likewise, the Women's Health Study found no significant effect of the vitamin on total cancer incidence or cancers of the breast, lung or colon, nor any effect on cancer deaths.

同样，妇女健康研究发现，维生素对于癌症的总发病率或乳癌、肺癌和结肠癌都没有任何显著的作用，对于癌症死亡也没有任何影响。

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The study also reported that the total cancer incidence was significantly lower among both the fish eaters and the vegetarians compared with meat eaters.

这项研究也报告说，吃鱼的人群和素食者癌症发病率比肉食者的要明显低的多。

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1981 - a Los Angeles study found a significant 2-4 times higher incidence of breast cancer among women under 33 years of age who aborted their first baby. (2).

1981年，洛杉矶的一项研究发现，在33岁以前堕过第一胎的妇女患乳腺癌的几率很明显高了2 - 4倍。

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However, another more pressing concern was prompted by the 2007 study that found the incidence of colorectal cancer, which had been falling in the US and Canada, rose temporarily just after the vitamin was automatically added to flour.

BBC: Folic acid 'cancer risk' fears played down by study

In a study of 288 women from 2001, the drug tamoxifen reduced breast-cancer incidence among healthy BRCA2 carriers by 62% compared with a placebo, though it didn't reduce breast-cancer incidence among healthy women with BRCA1 mutations.

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