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triple-negative breast cancer

(TRIH-pul-NEH-guh-tiv brest KAN-ser)
Triple-negative breast cancer is defined by a lack of expression of estrogen receptor (ER), progesterone receptor (PR), and human epidermal growth factor receptor 2 (HER2/neu). Also called ER-negative PR-negative HER2/neu-negative breast cancer and TNBC.
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