Hormone receptor positive breast cancer is a type of breast cancer that tests positive for estrogen receptors (ER) and/or progesterone receptors (PR). These receptors are proteins found in and on breast cells that bind to the hormones estrogen and progesterone. When these hormones attach to the receptors, they can stimulate the cancer cells to grow. This subtype of breast cancer is one of the most common and is generally more responsive to hormone therapy.
