What type of breast cancer is fulvestrant (Faslodex) used to treat on its own in postmenopausal women?

Fulvestrant (Faslodex) alone treats estrogen receptor-positive, locally advanced or metastatic breast cancer in postmenopausal women who have not received endocrine therapy, or whose disease relapsed on or after adjuvant antioestrogen therapy or progressed on antioestrogen therapy.