triple-positive breast cancer
(TRIH-pul-PAH-zih-tiv brest KAN-ser)
A type of
          breast cancer in which the tumor cells have estrogen
          receptors, progesterone receptors, and a larger than normal
          number of HER2 receptors on their surface. Knowing if
          breast cancer is triple positive may help plan the best
          treatment, which may include hormone therapy and drugs that
          target the HER2 receptor.