Long term (current) use of other agents affecting estrogen receptors and estrogen levels

**Inclusion terms:** - Long term (current) use of estrogen receptor downregulators - Long term (current) use of fulvestrant (Faslodex) - Long term (current) use of gonadotropin-releasing hormone (GnRH) agonist - Long term (current) use of goserelin acetate (Zoladex) - Long term (current) use of leuprolide acetate (leuprorelin) (Lupron) - Long term (current) use of megestrol acetate (Megace)