Only 24 percent of women in the study had sufficient blood levels of D at the time they were first diagnosed with breast cancer. Those who were deficient were nearly twice as likely to have their cancer recur or spread over the next 10 years, and 73 percent more likely to die of the disease.
"These are pretty big differences,'' said study leader Dr. Pamela Goodwin of Mount Sinai Hospital in Toronto. "It's the first time that vitamin D has been linked to breast cancer progression.''
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