The higher the value of ER and PR positive rate of breast cancer, the better the prognosis of this type of breast cancer, which means that the occurrence of breast cancer is related to the secretion of estrogen or progesterone in the body. or tamoxifen citrate tablets. Oral endocrine medication can inhibit the growth of tumor in the body and also reduce the chance of breast cancer in the opposite breast. If ER and PR are negative, it means that the occurrence of breast cancer is not related to estrogen and progesterone in the body, which is a factor of poor healing and prone to recurrence and metastasis after surgery.