ERT: The use of estrogen alone after menopause does not appear to increase the risk of developing breast cancer significantly, if at all. But when used long term (for
more than 10 years), ERT has been found to increase the risk of ovarian and breast cancer in some studies.
At this time there appear to be few strong reasons to use post-menopausal hormone therapy (combined PHT or ERT), other than possibly for
the short-term relief of menopausal symptoms.