quadruple-negative breast cancer
(kwah-DROO-pul NEH-guh-tiv brest KAN-ser)
A type of breast cancer in which the tumor cells do not have estrogen receptors, progesterone receptors, androgen receptors, or large amounts of HER2/neu protein on their surface. Knowing whether breast cancer is quadruple negative is important in planning treatment. Also called QNBC.