Sep 18, · The breast cancer cells have receptors (proteins) that attach to estrogen and progesterone, which helps them grow. Treatments that stop these hormones from attaching to these receptors are called hormone or endocrine therapy. Hormone therapy can reach cancer cells almost anywhere in the body and not just in the breast. Hormones that every woman has in her body -- estrogen and progesterone -- can be fuel for some types of breast cancer. They help the cells grow and spread. Hormone therapy, also called endocrine.
Estrogen-progestin therapy Treating menopausal symptoms with estrogen and progestin together is known as estrogen-progestin therapy (EPT) or combined hormone therapy. Although estrogen alone improves the symptoms of menopause, it increases the risk of cancer of the uterus (endometrial cancer). Estrogen-only HRT increases the risk of breast cancer, but only when used for more than 10 years. Estrogen-only HRT also can increase the risk of ovarian cancer. The higher breast cancer risk from using HRT is the same for so-called "bioidentical" and "natural" hormones as it is for synthetic hormones.
Hormonal (anti-estrogen) therapy works against hormone-receptor-positive breast cancer. It is completely different from hormone replacement therapy (HRT), which some women take during or following menopause. HRT is not a breast cancer treatment, and for women with a breast cancer diagnosis, HRT is considered relatively unsafe. Hormonal therapy keeps breast cancer cells from receiving or using the natural female hormones in your body (estrogen and progesterone) which they need to grow. Hormonal therapy also blocks the ability of health breast cells to receive hormones that could stimulate breast cancer cells to regrow again in the form of recurrence of the breast cancer within the breast or elsewhere in the body.