Dutch researchers report identifying a set of seven genes responsible for drug resistance and aggressiveness in the most common form of breast cancer.

These genes, some of which are novel, could provide therapeutic targets for personalized treatment of breast cancer and, possibly, for prevention of disease, they say.

These genes are found in estrogen receptor-positive (ER+) breast cancer, which investigators say is usually more treatable than breast cancer that is not fueled by estrogen.

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