<prompt> ER positive status in Ca Breast indicatesPrognosisEtiologySiteNone  <response>: The presence or absence of estrogen or progesterone receptors ; The presence of hormone receptors confers a slightly better prognosis. However, the practical reason for determining their presence is to predict the response to therapy. The highest rate of response approximately 80 to antiestrogen therapy oophorectomy or tamoxifen is seen in women whose tumor cells express both estrogen and progesterone receptors ref : Robbins Basic Pathology, 9E,page-713 