Long term (current) use of other agents affecting estrogen receptors and estrogen levels Inclusion term(s):Long term (current) use of estrogen receptor downregulatorsLong term (current) use of fulvestrant (Faslodex)Long term (current) use of gonadotropin-releasing hormone (GnRH) agonistLong term (current) use of goserelin acetate (Zoladex)Long term (current) use of leuprolide acetate (leuprorelin) (Lupron)Long term (current) use of megestrol acetate (Megace)