Some types of breast cancer are affected by hormones in the blood. ER-positive and PR-positive breast cancer cells have receptors (proteins) that attach to estrogen, which helps them grow. There are different ways to stop estrogen from attaching to these receptors. Hormone therapy is a form of Last Revised: September 26, 2017.
These two types of therapy produce opposite effects: hormone therapy for breast cancer blocks the growth of HR-positive breast cancer, whereas MHT can stimulate the growth of HR-positive breast cancer. For this reason, when a woman taking MHT is diagnosed with HR-positive breast cancer she is usually asked to stop that therapy.
Sep 06, 2018 · Estrogen receptor-positive (ER-positive) breast cancer is the most common type of breast cancer diagnosed today. According to the American Cancer Society, about Author: Ann Silberman.
Oct 09, 2017 · Estrogen and Breast Cancer: All Estrogen Is NOT the Same. Estrogen is the general term used for several types of estrogen-like hormones produced by the body, including estriol, estrone, and estradiol. Estriol is a weak estrogen and does not promote cancer formation.