December 7, 2012
Reduced Risk Of Breast Cancer For Women With Higher Carotenoid Levels
Women with higher circulating carotenoid levels are at a reduced risk of breast cancer according to a study published December 6 in the Journal of the National Cancer Institute
Carotenoids, which are micronutrients found in fruits and vegetables, have been found to have anticarcinogenic properties. Previous experimental studies have shown that carotenoids inhibit the tumor progression and reduce proliferation of estrogen receptor—positive (ER+) and estrogen receptor—negative (ER-) breast cancers. Despite the inverse association between carotenoids and breast cancer in prior studies, the specific carotenoid has differed across multiple studies.
The researchers found that in over 3,000 case subjects, there were statistically significantly inverse associations between circulating levels of individual and total carotenoids and breast cancer risk, with a stronger finding in ER- breast cancers. "The inverse associations we observed among ER– tumors highlight carotenoids as one of the first modifiable risk factors for this poor prognosis tumor type," the authors write, adding that while some evidence has shown that carotenoids inhibit the growth of ER+ breast cancers as well, it's possible that its effect is hidden by hormone related associations which overpower other risk factors. Still, the researchers feel that, "A diet high in carotenoid-rich fruits and vegetables offers many health benefits, including a possible reduced risk of breast cancer."
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