Breast Cancer Treatments Found to Cause Mutations

Metastatic breast cancer, one of the most common, is influenced by the estrogen hormone. 

Recent studies have shown that more than half of women with metastatic breast cancer had mutations in the estrogen receptor. All of the women in the study had been previously treated with an aromatase inhibitor, a drug which is used to block estrogen production. These mutations were not present before treatment.

These results show that the therapies used on these women caused mutations. This research is one step towards finding out why some women are not responsive to breast cancer treatments.

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