Estrogen receptor +ve, locally advanced or metastatic breast cancer in postmenopausal women not previously treated w/ endocrine therapy, or w/ disease relapse on or after adjuvant antiestrogen therapy, or disease progression on antiestrogen therapy. In combination w/ palbociclib for hormone receptor +ve, human epidermal growth factor receptor 2 -ve locally advanced or metastatic breast cancer in women w/ disease progression after endocrine therapy.