Hormone Replacement therapy after Breast Cancer continue…
I have only roundabout evidence regarding HRT in breast cancer survivors. For example, we know that younger women who have had breast cancer and then go on to become pregnant, with the associated high levels of estrogen and progesterone, do not have a worse prognosis or earlier relapse of breast cancer than women who do not experience a pregnancy. If estrogen can theoretically stimulate breast cancer growth, why do I see breast cancer appear in older postmenopausal women who are not on HRT? This is a fairly frequent occurrence, and most of these cancers are hormone receptor positive, yet they are growing in an estrogen-poor environment. This seems to counter what we know about the environment that is conducive to breast cancer, but this is just another reminder of how much we do not understand about this disease. (more…)