With respect to hormonal therapies that suppress or block the action of estrogen, there is a study called ATAC (
Arimidex, Tamoxifen, Alone or in Combination). Updated results were presented at the latest San Antonio Breast Cancer Symposium (December 2007). I read about it in the Women & Cancer Magazine (Spring 2008, pg. 88). I suggest those undergoing hormonal therapy to look into the convenience of combining the medicine, to benefit from both of them.