Women with high levels of the persistent chemicals PFOA and PFOS in their blood were more likely to develop an aggressive form of breast cancer. This is according to a new study from the U.S. National Institutes of Health (NIH), published in the *Journal of Clinical Oncology*.
The Study This applies to estrogen receptor-negative, or ER-negative, breast cancer. These tumors lack the receptors that allow the hormone estrogen to drive the growth of cancer cells. They are often more aggressive, have a poorer prognosis, and have few known risk factors. The researchers measured 17 PFAS compounds in blood samples taken several years before the women received their diagnosis.
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