A Georgetown University clinical study has added to the already impressive number of studies showing that higher vitamin D blood levels reduce a woman's risk of breast cancer by as much as 85 percent, and the new study is getting media attention.
"The results of the experiment , conducted at the Georgetown University Medical Center in Washington and released this week at the annual meeting of the American Association for Cancer Research, bolster the striking finding from the field of human epidemiology that women with low levels of vitamin D tend to have a higher risk of breast cancer, while those with more of the sunshine vitamin get less of the cancer," The Toronto Globe and Mail's Martin Mittelstaedt reported recently. "The new study found that mice with mammary cancers sensitive to estrogen, the most common type in women, had a twofold reduction in tumour incidence and a fourfold reduction the growth of their cancers if given vitamin D."
More than a dozen case-control studies have already suggested that low vitamin D levels are strongly connected with higher breast cancer risk. Lab studies have shown how the active form of vitamin D can inhibit the growth and spread of cancer cells. But this clinical study adds further weight to the argument.
According to the Globe and Mail, "Two major human trials are currently underway in the US. One at Creighton University in Omaha, the other a combined effort at Harvard Medical School and Brigham and Women's Hospital in Boston - using higher doses of vitamin D. The trials may be able to shed more light on its use as a possible cancer treatment and appropriate doses, although it is expected to be years before either reports results."
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