Meta-analysis of epidemiological studies finds some support for a link
An analysis of 21 studies that have investigated the link between ovarian cancer and the consumption of milk products and lactose has found some support for the hypothesis that high intake is associated with increased cancer risk. The results of this analysis, published online August 5, 2005 in the International Journal of Cancer, the official journal of the International Union Against Cancer (UICC), found that support was stronger in cohort studies, compared to case-control studies, which offered varying results.
Since a positive correlation between ovarian cancer risk and the consumption of milk products and lactose was first reported in 1989, many epidemiological studies have further examined the relationship. However, these studies have yielded conflicting conclusions. To better understand the uncertain relationship, researchers led by Susanna C. Larsson of the National Institute of Environmental Medicine at the Karolinska Institute in Sweden, conducted a meta-analysis of relevant case-control and cohort studies.
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